use anyhow::{Context, Result};
use serde::Deserialize;
use std::env;
use std::fs::File;
use std::io::BufReader;

#[derive(Deserialize)]
pub struct SocketAddress {
    pub address: [u8; 4],
    pub port: u16,
}

#[derive(Deserialize)]
pub struct EmailServer {
    pub server_name: String,
    pub email: String,
    pub password: String,
}

#[derive(Deserialize)]
pub struct Address {
    pub name: String,
    pub user: String,
    pub domain: String,
}

#[derive(Deserialize)]
pub struct Logging {
    pub directory: String,
    pub filename: String,
}

#[derive(Deserialize)]
pub struct ErrorMessages {
    pub captcha_error: String,
    pub email_error: String,
}

#[derive(Deserialize)]
pub struct Field {
    pub label: String,
    pub invalid_feedback: String,
}

#[derive(Deserialize)]
pub struct Strings {
    pub description: String,
    pub title: String,
    pub name_field: Field,
    pub email_field: Field,
    pub telefon_field_label: String,
    pub message_field: Field,
    pub captcha_field: Field,
    pub submit: String,
    pub success: String,
}

#[derive(Deserialize)]
pub struct Config {
    pub lang: String,
    pub path_prefix: String,
    pub socket_address: SocketAddress,
    pub email_server: EmailServer,
    pub email_from: Address,
    pub email_to: Address,
    pub logging: Logging,
    pub error_messages: ErrorMessages,
    pub strings: Strings,
}

impl Config {
    pub fn new() -> Result<Self> {
        let config_file_var = "CF_CONFIG_FILE";
        let config_path = env::var(config_file_var)
            .with_context(|| format!("Environment variable {config_file_var} missing!"))?;

        let config_file = File::open(&config_path)
            .with_context(|| format!("Can not open the config file at the path {config_path}"))?;
        let config_reader = BufReader::new(config_file);
        let config: Self = serde_yaml::from_reader(config_reader)
            .context("Can not parse the YAML config file!")?;

        Ok(config)
    }
}