use serde::Deserialize;
use std::{
    fs::{self, read_to_string, remove_dir_all},
    path::PathBuf,
};

use glob::glob;
use minify_html::{minify, Cfg};
use std::{fs::File, io::Write, path::Path};

#[derive(Deserialize, Clone, Default)]
pub struct FileConfig {
    pub scheme: Option<String>,
    pub port: Option<u16>,
    pub mail: Option<String>,
    pub lang: Option<String>,
    pub onion: Option<String>,
}

#[derive(Clone)]
pub struct Config {
    pub fc: FileConfig,
    pub static_location: String,
}

#[derive(Deserialize)]
struct AskamaConfig {
    general: AskamaConfigGeneral,
}

#[derive(Deserialize)]
struct AskamaConfigGeneral {
    dirs: Vec<String>,
}

impl FileConfig {
    fn new() -> Self {
        Self {
            scheme: Some("http".to_string()),
            port: Some(8080),
            ..FileConfig::default()
        }
    }

    fn complete(a: Self) -> Self {
        // Default config
        let d = FileConfig::new();

        /// Return the default value if nothing is value is none
        fn test<T>(val: Option<T>, default: Option<T>) -> Option<T> {
            if val.is_some() {
                val
            } else {
                default
            }
        }

        Self {
            scheme: test(a.scheme, d.scheme),
            port: test(a.port, d.port),
            mail: test(a.mail, d.mail),
            lang: test(a.lang, d.lang),
            onion: test(a.onion, d.onion),
        }
    }
}

fn get_file_config(file_path: &str) -> FileConfig {
    match fs::read_to_string(file_path) {
        Ok(file) => match toml::from_str(&file) {
            Ok(stored_config) => FileConfig::complete(stored_config),
            Err(file_error) => {
                panic!("Error in config file: {file_error}");
            }
        },
        Err(_) =>
        // No config file
        {
            FileConfig::new()
        }
    }
}

fn get_askama_config() -> AskamaConfig {
    toml::from_str(&read_to_string("askama.toml").unwrap()).unwrap()
}

pub fn get_config(file_path: &str) -> Config {
    let internal_config = get_file_config(file_path);

    let static_dir = "static".to_string();
    let templates_dirs = get_askama_config().general.dirs;
    if templates_dirs.len() != 1 {
        panic!("Too many templates directories")
    }
    let mut template_data = templates_dirs[0].split('/');

    let files_root = init(
        template_data.next().unwrap().to_string(),
        static_dir.clone(),
        template_data.next().unwrap().to_string(),
    );

    Config {
        fc: internal_config,
        static_location: format!("{}/{}", files_root, static_dir),
    }
}

fn init(dist_dir: String, static_dir: String, templates_dir: String) -> String {
    // Be sure that we not gonna use the dist folder by deleting it
    remove_dir_all(&dist_dir).unwrap_or_default();

    let cfg = Cfg::spec_compliant();

    // Static files
    for entry in glob(&format!("{static_dir}/**/*.*")).unwrap() {
        let path = entry.unwrap();
        let path_with_dist = path
            .to_string_lossy()
            .replace(&static_dir, &format!("{dist_dir}/{static_dir}"));

        copy_to_dist(&cfg, path, path_with_dist);
    }

    // Template files
    for entry in glob(&format!("{templates_dir}/**/*.*")).unwrap() {
        let path = entry.unwrap();
        let path_with_dist = path
            .to_string_lossy()
            .replace(&templates_dir, &format!("{dist_dir}/{templates_dir}"));

        copy_to_dist(&cfg, path, path_with_dist);
    }

    dist_dir
}

fn copy_to_dist(cfg: &Cfg, path: PathBuf, path_with_dist: String) {
    // Create folders
    let new_path = Path::new(&path_with_dist);
    fs::create_dir_all(new_path.parent().unwrap()).unwrap();

    let mut copy = true;
    if let Some(ext) = path.extension() {
        // List of files who should be minified
        if ["html", "css", "js", "svg", "webmanifest", "xml"]
            .iter()
            .any(|item| ext.to_string_lossy().to_lowercase().contains(item))
            && !cfg!(debug_assertions)
        {
            // We won't copy, we'll minify
            copy = false;

            // Minify
            let data = fs::read(&path).unwrap();
            let minified = minify(&data, cfg);

            // Write files
            let file = File::create(&path_with_dist);
            file.expect("Error when minify the file")
                .write_all(&minified)
                .unwrap();
        }
    }

    if copy {
        // If no minification is needed
        fs::copy(path, path_with_dist).unwrap();
    }
}