from base64 import b64encode
from io import BytesIO
from pathlib import Path

import numpy as np
from flask import flash, has_request_context, redirect, request, url_for
from flask_admin import expose
from flask_admin.contrib.sqla.fields import QuerySelectField, QuerySelectMultipleField
from flask_admin.contrib.sqla.filters import BooleanEqualFilter, FilterEqual
from flask_admin.helpers import get_form_data
from flask_admin.menu import MenuLink
from flask_admin.model.template import EndpointLinkRowAction
from flask_security import admin_change_password, current_user, hash_password
from flask_wtf import FlaskForm
from flask_wtf.file import FileAllowed, FileField, FileRequired
from matplotlib.figure import Figure
from sqlalchemy import and_, not_, or_, select
from werkzeug.utils import secure_filename
from wtforms import Form
from wtforms.fields import (
    BooleanField,
    DateField,
    DecimalField,
    IntegerField,
    RadioField,
    StringField,
    SubmitField,
    TextAreaField,
)
from wtforms.validators import URL, DataRequired, Email, NumberRange, Optional
from wtforms.widgets import NumberInput

from . import adminSpace, app, assistantSpace, db, user_datastore
from .advlabdb_independent_funs import flashRandomPassword
from .customClasses import (
    CustomIdEndpointLinkRowAction,
    SecureAdminBaseView,
    SecureAdminModelView,
)
from .database_import import importFromFile
from .exceptions import DataBaseException, ModelViewException
from .model_dependent_funs import initActiveSemesterMenuLinks
from .model_independent_funs import randomPassword
from .models import (
    MAX_MARK,
    MAX_YEAR,
    MIN_MARK,
    MIN_YEAR,
    Admin,
    Appointment,
    Assistant,
    Experiment,
    ExperimentMark,
    Group,
    GroupExperiment,
    Part,
    PartStudent,
    Program,
    Role,
    Semester,
    SemesterExperiment,
    Student,
    User,
)


def semesterExperimentQueryFactory():
    return SemesterExperiment.query.where(SemesterExperiment.semester == current_user.active_semester)


class SemesterRowFilter(FilterEqual):
    def get_options(self, view):
        if not has_request_context():
            return tuple()

        semesters = Semester.sortedSemestersStartingWithNewest()
        return tuple((semester.id, str(semester)) for semester in semesters)


class UserView(SecureAdminModelView):
    class SemesterFilter(SemesterRowFilter):
        def apply(self, query, value, alias=None):
            return query.where(User.active_semester_id == int(value))

    class CreateForm(Form):
        def roleQueryFactory():
            return Role.query

        def semesterQueryFactory():
            return Semester.query

        def default_roles():
            return [user_datastore.find_role("assistant")]

        email = StringField(
            "Email",
            validators=[DataRequired(), Email()],
        )
        roles = QuerySelectMultipleField(
            "Roles",
            query_factory=roleQueryFactory,
            validators=[DataRequired()],
            default=default_roles,
        )

        first_name = StringField(
            "First Name",
            validators=[DataRequired()],
        )
        last_name = StringField(
            "Last Name",
            validators=[DataRequired()],
        )
        phone_number = StringField(
            "Phone Number",
            validators=[Optional()],
        )
        mobile_phone_number = StringField(
            "Mobile Phone Number",
            validators=[Optional()],
        )
        building = StringField(
            "Building",
            validators=[Optional()],
        )
        room = StringField(
            "Room",
            validators=[Optional()],
        )

        semester_experiments = QuerySelectMultipleField(
            "Semester Experiments",
            query_factory=semesterExperimentQueryFactory,
            allow_blank=True,
            blank_text="-",
            description="Only needed if the user has the assistant role.",
        )

        active = BooleanField(
            "Active",
            default=True,
        )
        active_semester = QuerySelectField(
            "Active Semester",
            query_factory=semesterQueryFactory,
            validators=[DataRequired()],
            default=Semester.lastSemester,
            description="Not fixed and users (including assistants) can change it.",
        )

    class EditForm(CreateForm):
        semester_experiments = None

        generate_new_password = BooleanField(
            "Generate new random password. For security reasons, it is not possible to manually enter a password. Please use a password manager like Bitwarden or KeepassXC to save the randomly generated password.",
            default=False,
        )

    can_view_details = True

    column_list = [
        "first_name",
        "last_name",
        "email",
        "active",
        "roles",
        "active_semester",
        "current_login_at",
    ]
    column_details_list = column_list + [
        "phone_number",
        "mobile_phone_number",
        "building",
        "room",
        "create_datetime",
        "update_datetime",
    ]
    column_searchable_list = [
        "first_name",
        "last_name",
        "email",
    ]

    column_filters = (
        SemesterFilter(User, "Active Semester"),
        "active",
    )
    refreshFiltersCache = True

    column_editable_list = [
        "active",
    ]

    _skip_session_addition_on_model_creation = True

    def customCreateModel(self, form):
        password = randomPassword()
        hashedPassword = hash_password(password)

        email = form.email.data.lower()

        roles = [role.name for role in form.roles.data]

        model = user_datastore.create_user(
            email=email,
            password=hashedPassword,
            roles=roles,
            first_name=form.first_name.data,
            last_name=form.last_name.data,
            phone_number=form.phone_number.data,
            mobile_phone_number=form.mobile_phone_number.data,
            building=form.building.data,
            room=form.room.data,
            active=form.active.data,
            active_semester=form.active_semester.data,
        )

        flashRandomPassword(password)

        return model

    def on_model_delete(self, model):
        if model == current_user:
            raise ModelViewException("Tried to delete yourself as user!")

    def on_model_change(self, form, model, is_created):
        if not is_created:
            if model == current_user:
                if not form.active.data:
                    raise ModelViewException("Tried to deactivate yourself as user!")
                if not model.has_role("admin"):
                    raise ModelViewException("Tried to remove your admin role!")

            if hasattr(form, "generate_new_password") and form.generate_new_password.data:
                password = randomPassword()
                flashRandomPassword(password)

                admin_change_password(
                    model, password, notify=False
                )  # Password is automatically hashed with this function

        if model.has_role("assistant") and model.assistant is None:
            semester_experiments = form.semester_experiments.data if form.semester_experiments else []

            assistant = Assistant(user=model, semester_experiments=semester_experiments)
            self.session.add(assistant)

        if model.has_role("admin") and model.admin is None:
            flash("Admin role was assigned!", "danger")
            admin = Admin(user=model)
            self.session.add(admin)

    def after_model_change(self, form, model, is_created):
        if is_created:
            flash(
                f"{model.email} registered with role(s): {', '.join([role.name for role in model.roles])}.",
                category="success",
            )


class SemesterView(SecureAdminModelView):
    class CreateForm(Form):
        def defaultFormLabel():
            last_semester = Semester.lastSemester()
            if last_semester.label == "WS":
                return "SS"
            else:
                return "WS"

        def defaultFormYear():
            last_semester = Semester.lastSemester()
            if last_semester.label == "WS":
                return last_semester.year + 1
            else:
                return last_semester.year

        label = RadioField(
            "Semester",
            choices=["WS", "SS"],
            validators=[DataRequired()],
            default=defaultFormLabel,
        )
        year = IntegerField(
            "Year",
            validators=[DataRequired(), NumberRange(MIN_YEAR, MAX_YEAR)],
            default=defaultFormYear,
            description=f"Between {MIN_YEAR} and {MAX_YEAR}.",
        )
        transfer_parts = BooleanField(
            "Transfer parts",
            description="This option transfers the parts you have in your active semester. Make sure that your active semester is the last semester before creating a new one!",
            default=True,
        )
        transfer_assistants = BooleanField(
            "Transfer Assistants",
            description="This option transfers assistants of your active semester to active experiments in the new semester. Make sure that your active semester is the last semester before creating a new one! Active experiments are transferred anyway. If you do not want an experiment to be transferred, set it to inactive before creating the new semester. Experiments which are switched to active before creating the new semester will be created in the new semester without assistants. It is recommended to check the assistants of all experiments after creating a new semester.",
            default=True,
        )

    can_edit = False
    can_delete = False
    can_view_details = True
    column_display_all_relations = True

    column_list = [
        "label",
        "year",
        "parts",
    ]
    column_searchable_list = [
        "label",
        "year",
    ]
    column_default_sort = [
        ("year", True),
        ("label", True),
    ]

    def customCreateModel(self, form):
        return Semester.initFromOldSemester(
            label=form.label.data,
            year=form.year.data,
            oldSemester=current_user.active_semester,
            transferParts=form.transfer_parts.data,
            transferAssistants=form.transfer_assistants.data,
        )

    def addMenuLink(space, newSemester):
        categoryText = "Active semester"
        link = MenuLink(
            name=str(newSemester),
            url=url_for("set_semester") + "?semester_id=" + str(newSemester.id),
            category=categoryText,
        )

        category = space._menu_categories.get(categoryText)

        link.parent = category
        category._children.insert(0, link)

    def after_model_change(self, form, model, is_created):
        current_user.setActiveSemester(model)

        SemesterView.addMenuLink(adminSpace, model)
        SemesterView.addMenuLink(assistantSpace, model)


def programQueryFactory():
    return Program.query


class PartView(SecureAdminModelView):
    can_view_details = True
    column_display_all_relations = True

    column_sortable_list = []
    column_list = [
        "program",
        "number",
    ]
    column_details_exclude_list = [
        "semester",
    ]
    form_columns = column_list

    form_extra_fields = {
        "program": QuerySelectField(
            "Program",
            query_factory=programQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
    }
    form_args = {
        "number": {"widget": NumberInput(min=1)},
    }

    column_searchable_list = [
        "program.label",
        "number",
    ]

    def query_modifier(self, query):
        return query.where(Part.semester == current_user.active_semester)

    def customCreateModel(self, form):
        return Part(program=form.program.data, number=form.number.data, semester=current_user.active_semester)


class StudentView(SecureAdminModelView):
    can_view_details = True
    column_display_all_relations = True

    column_list = [
        "student_number",
        "first_name",
        "last_name",
        "uni_email",
        "contact_email",
        "part_students",
    ]
    column_descriptions = {
        "contact_email": "The preferred contact email address if entered by the student",
    }

    column_sortable_list = [
        "student_number",
        "first_name",
        "last_name",
    ]
    column_searchable_list = column_sortable_list + [
        "uni_email",
        "contact_email",
    ]

    form_excluded_columns = [
        "part_students",
    ]

    form_args = {
        "student_number": {"widget": NumberInput(min=0)},
        "uni_email": {"validators": [Email()]},
        "contact_email": {"validators": [Email()]},
    }

    column_extra_row_actions = [
        EndpointLinkRowAction(
            icon_class="fa fa-history",
            endpoint="experimentmark.index_view",
            id_arg="flt1_0",
            title="Experiments history",
        )
    ]


def partQueryFactory():
    return Part.query.where(Part.semester == current_user.active_semester)


def groupQueryFactory():
    return Group.query.where(Group.semester == current_user.active_semester)


class PartRowFilter(FilterEqual):
    def get_options(self, view):
        if not has_request_context():
            return tuple()

        parts = db.session.execute(select(Part).where(Part.semester == current_user.active_semester)).scalars()
        return tuple((part.id, part.str_without_semester()) for part in parts)


class PartStudentView(SecureAdminModelView):
    class PartFilter(PartRowFilter):
        def apply(self, query, value, alias=None):
            return query.where(PartStudent.part_id == int(value))

    class StudentEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.student_id

    class GroupEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.group_id

    class PartEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.part_id

    class CreateForm(Form):
        def studentQueryFactory():
            return Student.query

        student = QuerySelectField(
            "Student",
            query_factory=studentQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
        part = QuerySelectField(
            "Part",
            query_factory=partQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
        group = QuerySelectField(
            "Group",
            query_factory=groupQueryFactory,
            allow_blank=True,
            blank_text="-",
        )

    class EditForm(CreateForm):
        student = None
        part = None

    column_display_all_relations = True

    column_filters = (
        PartFilter(PartStudent, "Part"),
        "student.student_number",
        "student.first_name",
        "student.last_name",
        "group.number",
        "experiment_marks",
    )
    refreshFiltersCache = True

    column_extra_row_actions = [
        StudentEndpointLinkRowAction(
            icon_class="fa fa-user",
            endpoint="student.details_view",
            title="Student",
        ),
        GroupEndpointLinkRowAction(
            icon_class="fa fa-users",
            endpoint="group.details_view",
            title="Group",
        ),
        PartEndpointLinkRowAction(
            icon_class="fa fa-puzzle-piece",
            endpoint="part.details_view",
            title="Part",
        ),
    ]

    def query_modifier(self, query):
        return query.join(Part).where(Part.semester == current_user.active_semester)

    def on_model_change(self, form, model, is_created):
        PartStudent.check(model.part, model.group)


def partStudentQueryFactory():
    return PartStudent.query.join(Part).where(Part.semester == current_user.active_semester)


class ProgramRowFilter(FilterEqual):
    def get_options(self, view):
        if not has_request_context():
            return tuple()

        programs = db.session.execute(select(Program)).scalars()
        return tuple((program.id, str(program)) for program in programs)


class GroupView(SecureAdminModelView):
    class ProgramFilter(ProgramRowFilter):
        def apply(self, query, value, alias=None):
            return query.where(Group.program_id == int(value))

    def formFactory(is_created, group):
        if is_created:

            def query_factory():
                return partStudentQueryFactory().where(PartStudent.group == None)

        else:

            def query_factory():
                return partStudentQueryFactory().where(
                    or_(
                        and_(PartStudent.group == None, Part.program == group.program),
                        PartStudent.group == group,
                    )
                )

        class CustomForm(Form):
            part_students = QuerySelectMultipleField(
                "Part Students",
                query_factory=query_factory,
                validators=[DataRequired()],
                description="The part students have to be in the same program!",
            )

        return CustomForm

    column_display_all_relations = True

    column_exclude_list = [
        "semester",
    ]

    column_filters = (
        ProgramFilter(Group, "Program"),
        "number",
    )
    refreshFiltersCache = True

    def query_modifier(self, query):
        return query.where(Group.semester == current_user.active_semester)

    def customCreateModel(self, form):
        return Group.customInit(form.part_students.data)

    def create_form(self, obj=None):
        formClass = GroupView.formFactory(is_created=True, group=None)
        return formClass(get_form_data(), obj=obj)

    def edit_form(self, obj=None):
        formClass = GroupView.formFactory(is_created=False, group=obj)
        return formClass(get_form_data(), obj=obj)


class ExperimentView(SecureAdminModelView):
    class ProgramFilter(ProgramRowFilter):
        def apply(self, query, value, alias=None):
            return query.where(Experiment.program_id == int(value))

    can_view_details = True
    column_display_all_relations = True

    column_filters = (
        ProgramFilter(Experiment, "Program"),
        "active",
    )
    refreshFiltersCache = True

    column_list = [
        "number",
        "program",
        "title",
        "active",
    ]
    column_descriptions = {
        "active": "Active experiments are present in new semesters",
    }
    column_searchable_list = [
        "number",
        "title",
    ]

    form_columns = column_list + [
        "description",
        "wiki_link",
        "building",
        "room",
        "responsibility",
        "duration_in_days",
    ]

    column_editable_list = [
        "active",
    ]

    form_args = {
        "number": {"widget": NumberInput(min=1)},
        "wiki_link": {"validators": [URL()]},
        "duration_in_days": {"widget": NumberInput(min=1)},
    }
    form_extra_fields = {
        "program": QuerySelectField(
            "Program",
            query_factory=programQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
    }


def assistantQueryFactory():
    return Assistant.query.join(User).where(User.active == True)


def weighting_field(label: str, default: float):
    return DecimalField(
        label,
        validators=[DataRequired(), NumberRange(0, 1)],
        default=default,
        description="Between 0 and 1.",
        places=2,
        widget=NumberInput(step=0.01),
    )


class SemesterExperimentView(SecureAdminModelView):
    class ProgramFilter(ProgramRowFilter):
        def apply(self, query, value, alias=None):
            return query.join(Experiment).where(Experiment.program_id == int(value))

    class ExperimentEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.experiment_id

    class CreateForm(Form):
        def experimentQueryFactory():
            return Experiment.query.where(Experiment.active == True)

        experiment = QuerySelectField(
            "Experiment",
            query_factory=experimentQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )

        oral_weighting = weighting_field("Oral weighting", 0.5)
        protocol_weighting = weighting_field("Protocol weighting", 0.5)
        final_weighting = weighting_field("Final weighting", 1.0)

        assistants = QuerySelectMultipleField(
            "Assistants",
            query_factory=assistantQueryFactory,
        )

    class EditForm(CreateForm):
        experiment = None

    can_view_details = True
    column_display_all_relations = True

    column_list = [
        "experiment",
        "assistants",
    ]
    column_details_exclude_list = [
        "semester",
    ]

    column_filters = (ProgramFilter(SemesterExperiment, "Program"),)
    refreshFiltersCache = True

    column_searchable_list = [
        "experiment.number",
        "experiment.title",
    ]

    column_extra_row_actions = [
        ExperimentEndpointLinkRowAction(
            icon_class="fa fa-flask",
            endpoint="experiment.details_view",
            title="Experiment",
        ),
    ]

    def query_modifier(self, query):
        return query.where(SemesterExperiment.semester == current_user.active_semester)

    def customCreateModel(self, form):
        return SemesterExperiment(
            semester=current_user.active_semester,
            oral_weighting=form.oral_weighting.data,
            protocol_weighting=form.protocol_weighting.data,
            final_weighting=form.final_weighting.data,
            experiment=form.experiment.data,
            assistants=form.assistants.data,
        )

    def on_model_change(self, form, model, is_created):
        model.checkAndRoundWeightings()

    def update_model(self, form, model):
        weightingsChanged = (
            form.oral_weighting.data != model.oral_weighting
            or form.protocol_weighting.data != model.protocol_weighting
            or form.final_weighting.data != model.final_weighting
        )

        updateSuccessful = super().update_model(form, model)

        if updateSuccessful and weightingsChanged:
            # Custom after_model_change
            model.updateFinalExperimentAndPartMarks()

        return updateSuccessful


def userHasRoleFilterFactory(column, role_name):
    class UserHasRoleFilter(BooleanEqualFilter):
        def apply(self, query, value, alias=None):
            query = query.join(User)
            if bool(int(value)):  # value is string "0" or "1"
                return query.join(User.roles).where(Role.name == role_name)
            else:
                return query.where(not_(User.roles.any(Role.name == role_name)))

    return UserHasRoleFilter(column, f"Currently has {role_name} role")


class AssistantView(SecureAdminModelView):
    class UserEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.user_id

    def assistantUserQueryFactory():
        return User.query.join(User.roles).where(Role.name == "assistant")

    can_view_details = True

    column_list = [
        "user",
        "semester_experiments",
    ]
    column_details_list = column_list + [
        "user.phone_number",
        "user.mobile_phone_number",
        "user.building",
        "user.room",
        "appointments",
        "experiment_marks",
    ]
    column_searchable_list = [
        "user.first_name",
        "user.last_name",
        "user.email",
    ]
    column_filters = (
        userHasRoleFilterFactory(Assistant, "assistant"),
        "user.active",
    )
    form_excluded_columns = [
        "experiment_marks",
        "appointments",
    ]

    form_extra_fields = {
        "user": QuerySelectField(
            "User",
            query_factory=assistantUserQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        ),
        "semester_experiments": QuerySelectMultipleField(
            "Semester Experiments",
            query_factory=semesterExperimentQueryFactory,
            allow_blank=True,
            blank_text="-",
        ),
    }

    column_extra_row_actions = [
        UserEndpointLinkRowAction(
            icon_class="fa fa-user",
            endpoint="user.details_view",
            title="User",
        ),
    ]


class AdminView(SecureAdminModelView):
    class UserEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.user_id

    can_export = False
    can_set_page_size = False
    can_create = False
    can_edit = False
    can_delete = False

    column_list = [
        "user",
    ]
    column_filters = (
        userHasRoleFilterFactory(Admin, "admin"),
        "user.active",
    )

    column_extra_row_actions = [
        UserEndpointLinkRowAction(
            icon_class="fa fa-user",
            endpoint="user.details_view",
            title="User",
        ),
    ]


class ExperimentRowFilter(FilterEqual):
    def get_options(self, view):
        if not has_request_context():
            return tuple()

        activeExperiments = db.session.execute(select(Experiment).where(Experiment.active == True)).scalars()
        return tuple(
            (
                f"{activeExperiment.number},{activeExperiment.program_id}",
                f"{activeExperiment.number} {activeExperiment.program}",
            )
            for activeExperiment in activeExperiments
        )

    def get_values(value):
        values = value.split(",")
        experimentNumber = int(values[0])
        programId = int(values[1])

        return (experimentNumber, programId)


def group_experiment_note_field():
    return TextAreaField(
        "Note",
        validators=[Optional()],
        description="This note can be seen and edited by assistants that are responsible for this semester experiment.",
    )


def appointment_fields(number=None):
    if number is None:
        # Used in AppointmentView
        label_addition = ""
        date_validator = DataRequired()
        date_description = None
    else:
        # Used in GroupExperimentView
        label_addition = f"Appointment-{number} "
        date_validator = Optional()

        if number == 1:
            date_description = "Set if you already want to add an appointment. Otherwise, leave it blank and you can do it later under the Appointment tab."
        else:
            date_description = "Add another appointment (see above)."

    date = DateField(
        label_addition + "Date",
        validators=[date_validator],
        description=date_description,
    )
    special = BooleanField(
        label_addition + "Special",
        default=False,
        description="A special appointment should take place in the semester break.",
    )
    assistant = QuerySelectField(
        label_addition + "Assistant",
        query_factory=assistantQueryFactory,
        allow_blank=True,
        blank_text="Auto assign if experiment has only one assistant",
    )
    return date, special, assistant


class GroupExperimentView(SecureAdminModelView):
    class ExperimentFilter(ExperimentRowFilter):
        def apply(self, query, value, alias=None):
            experimentNumber, programId = ExperimentRowFilter.get_values(value)

            return (
                query.join(SemesterExperiment)
                .join(Experiment)
                .where(Experiment.program_id == programId, Experiment.number == experimentNumber)
            )

    class GroupEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.group_id

    class SemesterExperimentEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.semester_experiment_id

    class EditForm(Form):
        note = group_experiment_note_field()

    class CreateForm(Form):
        group = QuerySelectField(
            "Group",
            query_factory=groupQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
        semester_experiment = QuerySelectField(
            "Semester Experiment",
            query_factory=semesterExperimentQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )

        appointment1_date, appointment1_special, appointment1_assistant = appointment_fields(1)
        appointment2_date, appointment2_special, appointment2_assistant = appointment_fields(2)

        note = group_experiment_note_field()

    column_display_all_relations = True

    column_filters = (
        ExperimentFilter(GroupExperiment, "Experiment"),
        "group.number",
        "appointments",
        "experiment_marks",
    )
    refreshFiltersCache = True

    column_extra_row_actions = [
        GroupEndpointLinkRowAction(
            icon_class="fa fa-users",
            endpoint="group.details_view",
            title="Group",
        ),
        SemesterExperimentEndpointLinkRowAction(
            icon_class="fa fa-flask",
            endpoint="semesterexperiment.details_view",
            title="SemesterExperiment",
        ),
    ]

    def query_modifier(self, query):
        return query.join(Group).where(Group.semester == current_user.active_semester)

    def customCreateModel(self, form):
        return GroupExperiment(semester_experiment=form.semester_experiment.data, group=form.group.data)

    def on_model_change(self, form, model, is_created):
        if is_created:
            for date, special, assistant in (
                (form.appointment1_date.data, form.appointment1_special.data, form.appointment1_assistant.data),
                (form.appointment2_date.data, form.appointment2_special.data, form.appointment2_assistant.data),
            ):
                if date is not None:
                    appointment = Appointment(date=date, special=special, group_experiment=model, assistant=assistant)

                    self.session.add(appointment)

    def after_model_change(self, form, model, is_created):
        if is_created:
            if model.appointments:
                flash(f"Appointments {model.appointments} added.", "success")


def groupExperimentQueryFactory():
    return GroupExperiment.query.join(SemesterExperiment).where(
        SemesterExperiment.semester == current_user.active_semester
    )


class AssistantRowFilter(FilterEqual):
    def get_options(self, view):
        if not has_request_context():
            return tuple()

        activeAssistants = assistantQueryFactory()
        return tuple((assistant.id, str(assistant)) for assistant in activeAssistants)


class AppointmentView(SecureAdminModelView):
    class ExperimentFilter(ExperimentRowFilter):
        def apply(self, query, value, alias=None):
            experimentNumber, programId = ExperimentRowFilter.get_values(value)

            return (
                query.join(GroupExperiment)
                .join(SemesterExperiment)
                .join(Experiment)
                .where(Experiment.program_id == programId, Experiment.number == experimentNumber)
            )

    class AssistantFilter(AssistantRowFilter):
        def apply(self, query, value, alias=None):
            return query.where(Appointment.assistant_id == int(value))

    class GroupExperimentEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.group_experiment_id

    class AssistantEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.assistant_id

    class CreateAndEditForm(Form):
        group_experiment = QuerySelectField(
            "Group Experiment",
            query_factory=groupExperimentQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
        date, special, assistant = appointment_fields()

    column_descriptions = {
        "special": "A special appointment should take place in the semester break",
    }
    column_filters = (
        ExperimentFilter(Appointment, "Experiment"),
        AssistantFilter(Appointment, "Assistant"),
        "group_experiment.group",
        "date",
        "special",
    )
    refreshFiltersCache = True

    column_editable_list = [
        "date",
        "special",
    ]

    column_extra_row_actions = [
        GroupExperimentEndpointLinkRowAction(
            icon_class="fa fa-flask",
            endpoint="groupexperiment.details_view",
            title="GroupExperiment",
        ),
        AssistantEndpointLinkRowAction(
            icon_class="fa fa-user-secret",
            endpoint="assistant.details_view",
            title="Assistant",
        ),
    ]

    def query_modifier(self, query):
        return (
            query.join(GroupExperiment)
            .join(SemesterExperiment)
            .where(SemesterExperiment.semester == current_user.active_semester)
        )

    def customCreateModel(self, form):
        return Appointment(
            date=form.date.data,
            special=form.special.data,
            group_experiment=form.group_experiment.data,
            assistant=form.assistant.data,
        )

    def customUpdateModel(self, form, model):
        if form.date is None:
            # For editable
            model.special = form.special.data
        elif form.special is None:
            # For editable
            model.date = form.date.data
        else:
            # Not editable, full form
            model.custom_update(
                date=form.date.data,
                special=form.special.data,
                group_experiment=form.group_experiment.data,
                assistant=form.assistant.data,
            )


class ExperimentMarkView(SecureAdminModelView):
    class StudentFilter(FilterEqual):
        def validate(self, value):
            if db.session.get(Student, value) is not None:
                return True
            else:
                return False

        def apply(self, query, value, alias=None):
            return query.join(PartStudent).where(PartStudent.student_id == int(value))

    class AssistantFilter(AssistantRowFilter):
        def apply(self, query, value, alias=None):
            return query.where(ExperimentMark.assistant_id == int(value))

    class AdminFilter(FilterEqual):
        def get_options(self, view):
            if not has_request_context():
                return tuple()

            admins = db.session.execute(select(Admin).join(User).where(User.active == True)).scalars()
            return tuple((admin.id, str(admin)) for admin in admins)

        def apply(self, query, value, alias=None):
            return query.where(ExperimentMark.admin_id == int(value))

    class ExperimentFilter(ExperimentRowFilter):
        def apply(self, query, value, alias=None):
            experimentNumber, programId = ExperimentRowFilter.get_values(value)

            return (
                query.join(GroupExperiment)
                .join(SemesterExperiment)
                .join(Experiment)
                .where(Experiment.program_id == programId, Experiment.number == experimentNumber)
            )

    class ProgramFilter(ProgramRowFilter):
        def apply(self, query, value, alias=None):
            return query.join(PartStudent).join(Part).where(Part.program_id == int(value))

    class PartFilter(PartRowFilter):
        def apply(self, query, value, alias=None):
            return query.join(PartStudent).where(PartStudent.part_id == int(value))

    class SemesterFilter(SemesterRowFilter):
        def apply(self, query, value, alias=None):
            return (
                query.join(GroupExperiment).join(SemesterExperiment).where(SemesterExperiment.semester_id == int(value))
            )

    class PartStudentEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.part_student_id

    class GroupExperimentEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.group_experiment_id

    class AssistantEndpointLinkRowAction(CustomIdEndpointLinkRowAction):
        def customId(self, row):
            return row.assistant_id

    class CreateForm(Form):
        part_student = QuerySelectField(
            "Part Student",
            query_factory=partStudentQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )
        group_experiment = QuerySelectField(
            "Group Experiment",
            query_factory=groupExperimentQueryFactory,
            validators=[DataRequired()],
            allow_blank=True,
            blank_text="-",
        )

    class EditForm(Form):
        oral_mark = IntegerField(
            "Oral Mark",
            validators=[Optional(), NumberRange(MIN_MARK, MAX_MARK)],
            description=f"Between {MIN_MARK} and {MAX_MARK}.",
        )
        protocol_mark = IntegerField(
            "Protocol Mark",
            validators=[Optional(), NumberRange(MIN_MARK, MAX_MARK)],
            description=f"Between {MIN_MARK} and {MAX_MARK}.",
        )

    column_descriptions = {
        "oral_mark": f"Between {MIN_MARK} and {MAX_MARK}",
        "protocol_mark": f"Between {MIN_MARK} and {MAX_MARK}",
        "final_experiment_mark": "Calculated automatically with oral and protocol marks and weightings",
        "assistant": "The last assistant who edited the mark",
        "admin": "The last admin who edited the mark",
    }

    column_filters = (
        StudentFilter(ExperimentMark, "Student / ID"),
        SemesterFilter(ExperimentMark, "Semester"),
        AssistantFilter(ExperimentMark, "Assistant"),
        AdminFilter(ExperimentMark, "Admin"),
        ExperimentFilter(ExperimentMark, "Experiment"),
        ProgramFilter(ExperimentMark, "Program"),
        PartFilter(ExperimentMark, "Part"),
        "group_experiment.group",
        "oral_mark",
        "protocol_mark",
        "final_experiment_mark",
    )
    refreshFiltersCache = True

    column_default_sort = [("oral_mark", False), ("protocol_mark", False)]

    column_extra_row_actions = [
        PartStudentEndpointLinkRowAction(
            icon_class="fa fa-user",
            endpoint="partstudent.details_view",
            title="PartStudent",
        ),
        GroupExperimentEndpointLinkRowAction(
            icon_class="fa fa-flask",
            endpoint="groupexperiment.details_view",
            title="GroupExperiment",
        ),
        AssistantEndpointLinkRowAction(
            icon_class="fa fa-user-secret",
            endpoint="assistant.details_view",
            title="Assistant",
        ),
    ]

    # TODO: Find solution
    """
    # Deactivated for the experiments history of a student.
    def query_modifier(self, query):
        return (
            query.join(GroupExperiment)
            .join(SemesterExperiment)
            .where(SemesterExperiment.semester == current_user.active_semester)
        )
    """

    def customCreateModel(self, form):
        return ExperimentMark(part_student=form.part_student.data, group_experiment=form.group_experiment.data)

    def update_model(self, form, model):
        if (form.oral_mark is not None and form.oral_mark.data != model.oral_mark) or (
            form.protocol_mark is not None and form.protocol_mark.data != model.protocol_mark
        ):
            model.admin = current_user.admin

            updateSuccessful = super().update_model(form, model)

            model.part_student.checkThenSetFinalPartMark()

            return updateSuccessful

        # Nothing changed
        return True


class ProgramView(SecureAdminModelView):
    can_export = False
    can_set_page_size = False
    can_view_details = True
    column_display_all_relations = True

    column_list = [
        "label",
    ]
    column_sortable_list = []
    form_excluded_columns = [
        "parts",
        "experiments",
        "groups",
    ]


class ImportView(SecureAdminBaseView):
    class FileForm(FlaskForm):
        file = FileField(
            label="Import file",
            validators=[FileRequired(), FileAllowed(["txt"], "Only txt files are allowed!")],
            description="The import file has to be a text file (with .txt at the end) encoded in UTF-8. It has to strictly follow the required format.",
        )
        submit = SubmitField(
            label="Upload and import",
        )

    @expose(methods=("GET", "POST"))
    def index(self):
        form = ImportView.FileForm()

        if form.validate_on_submit():
            f = form.file.data
            filename = secure_filename(f.filename)

            directory = "db/import_files"
            Path(directory).mkdir(exist_ok=True)

            filePath = directory + f"/{filename}"
            f.save(filePath)

            try:
                importFromFile(filePath)
            except Exception as ex:
                flash(str(ex), "error")

            return redirect(url_for("index"))

        return self.render("import.html", form=form)


class ActionsView(SecureAdminBaseView):
    class ActionsForm(FlaskForm):
        manualUpdateFinalExperimentAndPartMarksSubmit = SubmitField(
            label="Manually update final experiment and part marks",
        )

    @expose(methods=("GET", "POST"))
    def index(self):
        form = ActionsView.ActionsForm()

        if form.validate_on_submit():
            if form.manualUpdateFinalExperimentAndPartMarksSubmit.data:
                for semesterExperiment in current_user.active_semester.semester_experiments:
                    semesterExperiment.updateFinalExperimentAndPartMarks()

                flash("Manually updated all final experiment and part marks", "success")

            return redirect(url_for("index"))

        return self.render("actions.html", form=form)


class AnalysisView(SecureAdminBaseView):
    class AnalysisForm(FlaskForm):
        assistantMarksSubmit = SubmitField(
            label="Assistant's marks",
        )
        finalPartMarksSubmit = SubmitField(
            label="Final part marks",
        )

    def htmlFig(fig):
        buf = BytesIO()
        fig.savefig(buf, format="png")

        return b64encode(buf.getbuffer()).decode("ascii")

    def markHist(data, title):
        fig = Figure()
        ax = fig.subplots()
        ax.set_xlim(MIN_MARK - 0.5, MAX_MARK + 0.5)
        ax.set_xticks(np.arange(MAX_MARK + 1))
        ax.set_xlabel("Mark")

        N = data.size
        title += f"\nN = {N}"

        if N > 0:
            hist = ax.hist(
                data,
                bins=np.arange(MAX_MARK) - 0.5,
            )
            ax.set_yticks(np.arange(N + 1))
            title += f" | mean = {round(np.mean(data), 1)}"
        else:
            ax.set_yticks(np.arange(2))

        ax.set_title(title)

        return AnalysisView.htmlFig(fig)

    def get_experiment_marks(assistant, attr):
        data = []

        for experimentMark in assistant.experiment_marks:
            mark = getattr(experimentMark, attr)
            if mark is not None:
                data.append(mark)

        return np.array(data)

    def markHists(markType, activeAssistants):
        attr = markType.lower() + "_mark"
        markTypeTitleAddition = f" | {markType} marks"
        marks = [AnalysisView.get_experiment_marks(assistant, attr) for assistant in activeAssistants]

        hists = [
            AnalysisView.markHist(
                data=marks[i],
                title=str(activeAssistants[i]) + markTypeTitleAddition,
            )
            for i in range(len(marks))
        ]

        hists.append(
            AnalysisView.markHist(
                data=np.hstack(marks),
                title="All" + markTypeTitleAddition,
            )
        )

        return hists

    def get_final_part_marks(part):
        data = []
        for partStudent in part.part_students:
            mark = partStudent.final_part_mark
            if mark is not None:
                data.append(mark)

        return np.array(data)

    @expose(methods=("GET", "POST"))
    def index(self):
        form = AnalysisView.AnalysisForm()

        if form.validate_on_submit():
            if form.assistantMarksSubmit.data:
                activeAssistants = assistantQueryFactory()

                oralMarkHists = AnalysisView.markHists("Oral", activeAssistants)
                protocolMarkHists = AnalysisView.markHists("Protocol", activeAssistants)

                return self.render(
                    "analysis/assistant_marks.html",
                    histIndices=range(len(oralMarkHists)),
                    oralMarkHists=oralMarkHists,
                    protocolMarkHists=protocolMarkHists,
                )

            if form.finalPartMarksSubmit.data:
                parts = current_user.active_semester.parts
                activeSemesterFinalPartMarksHists = [
                    AnalysisView.markHist(
                        data=AnalysisView.get_final_part_marks(part),
                        title=str(part),
                    )
                    for part in parts
                ]

                semesters = Semester.sortedSemestersStartingWithNewest()
                semesterLabels = [str(semester) for semester in semesters]
                meanFinalPartMarks = np.flip(
                    [
                        np.mean(
                            np.hstack(
                                [
                                    [partStudent.final_part_mark for partStudent in part.part_students]
                                    for part in semester.parts
                                ]
                            )
                        )
                        for semester in semesters
                    ]
                )

                fig = Figure()
                lenMeanFinalPartMarks = len(meanFinalPartMarks)
                if lenMeanFinalPartMarks > 0:
                    ax = fig.subplots()
                    x = range(1, lenMeanFinalPartMarks + 1)
                    ax.plot(
                        x,
                        meanFinalPartMarks,
                        marker="d",
                    )
                    # TODO: Change ticks to semester labels
                    # TODO: Check linestyle
                    ax.set_xticks(x)
                    ax.set_xlim(0.5, x[-1] + 0.5)

                meanFinalPartMarksPlot = AnalysisView.htmlFig(fig)

                return self.render(
                    "analysis/final_part_marks.html",
                    activeSemesterFinalPartMarksHists=activeSemesterFinalPartMarksHists,
                    meanFinalPartMarksPlot=meanFinalPartMarksPlot,
                )

        return self.render("analysis/analysis.html", form=form)


class DocsView(SecureAdminBaseView):
    @expose("/")
    def index(self):
        return self.render("docs/docs.html", role="admin")


adminSpace.add_view(StudentView(Student, db.session, url="student"))
adminSpace.add_view(PartStudentView(PartStudent, db.session, url="part_student"))
adminSpace.add_view(GroupView(Group, db.session, url="group"))
adminSpace.add_view(GroupExperimentView(GroupExperiment, db.session, url="group_experiment"))
adminSpace.add_view(AppointmentView(Appointment, db.session, url="appointment"))
adminSpace.add_view(ExperimentMarkView(ExperimentMark, db.session, url="experiment_mark"))
adminSpace.add_view(ExperimentView(Experiment, db.session, url="experiment"))
adminSpace.add_view(SemesterExperimentView(SemesterExperiment, db.session, url="semester_experiment"))
adminSpace.add_view(SemesterView(Semester, db.session, url="semester"))
adminSpace.add_view(PartView(Part, db.session, url="part"))
adminSpace.add_view(AssistantView(Assistant, db.session, url="assistant"))
adminSpace.add_view(AdminView(Admin, db.session, url="admin"))
adminSpace.add_view(UserView(User, db.session, url="user"))
adminSpace.add_view(ProgramView(Program, db.session, url="program"))
adminSpace.add_view(ImportView(name="Import", url="import"))
adminSpace.add_view(ActionsView(name="Actions", url="actions"))
adminSpace.add_view(AnalysisView(name="Analysis", url="analysis"))
adminSpace.add_view(DocsView(name="Docs", url="docs"))

initActiveSemesterMenuLinks(adminSpace)