use std::{
    fs::{create_dir_all, File},
    io::{Read, Write},
    path::Path,
};

use serde::{Deserialize, Serialize};

use crate::{db::db_setup, error::MLE, Modloader, VersionLevel, check_game_versions};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Cfg {
    pub data: String,
    pub cache: String,
    pub versions: String,
    pub defaults: Defaults,
    pub apis: Apis,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Apis {
    pub modrinth: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Defaults {
    pub modloader: Modloader,
    pub version: VersionLevel,
}

impl Cfg {
    pub async fn init(path: Option<String>) -> MLE<Self> {
        let configfile = match path.clone() {
            Some(p) => p,
            None => dirs::config_dir()
                .unwrap()
                .join("modlist")
                .join("config.toml")
                .to_string_lossy()
                .to_string(),
        };

        let mut file = match File::open(&configfile) {
            Ok(file) => file,
            Err(err) => {
                if err.kind() == std::io::ErrorKind::NotFound && path.is_none() {
                    create_config(&configfile)?;
                    File::open(&configfile)?
                } else {
                    return Err(err.into());
                }
            }
        };
        let mut content = String::new();
        file.read_to_string(&mut content)?;
        let config = toml::from_str::<Cfg>(&content)?;
        //Check cache
        if !Path::new(&config.cache).exists() {
            create_cache(&config.cache)?;
        };
        //Check database
        let datafile = format!("{}/data.db", config.data);
        match File::open(&datafile) {
            Ok(..) => (),
            Err(..) => create_database(&datafile)?,
        };
        //Check versions
        let versionfile = format!("{}/versions.json", config.versions);
        match File::open(&versionfile) {
            Ok(..) => (),
            Err(..) => {
                create_versions_dummy(&versionfile).await?;
                check_game_versions(&versionfile, true).await?;
            },
        }

        Ok(config)
    }
}

fn create_config(path: &str) -> MLE<()> {
    print!("No config file found, create default");
    //Force flush of stdout, else print! doesn't print instantly
    std::io::stdout().flush()?;
    let cache_dir = dirs::cache_dir()
        .unwrap()
        .join("modlist")
        .to_string_lossy()
        .to_string();
    let default_cfg = Cfg {
        data: cache_dir.clone(),
        cache: format!("{}/cache", cache_dir),
        versions: cache_dir,
        defaults: Defaults {
            modloader: Modloader::Fabric,
            version: VersionLevel::Release
        },
        apis: Apis {
            modrinth: String::from("https://api.modrinth.com/v2/"),
        },
    };
    create_dir_all(path.split("config.toml").collect::<Vec<&str>>()[0])?;
    let mut file = File::create(path)?;
    file.write_all(toml::to_string(&default_cfg)?.as_bytes())?;
    println!(" ✓");
    Ok(())
}

fn create_database(path: &str) -> MLE<()> {
    print!("No database found, create base");
    //Force flush of stdout, else print! doesn't print instantly
    std::io::stdout().flush()?;

    File::create(path)?;
    db_setup(path)?;
    println!(" ✓");
    Ok(())
}

fn create_cache(path: &str) -> MLE<()> {
    print!("No cache direcory found, create one");
    //Force flush of stdout, else print! doesn't print instantly
    std::io::stdout().flush()?;

    create_dir_all(path)?;
    println!(" ✓");
    Ok(())
}

async fn create_versions_dummy(path: &str) -> MLE<()> {
    print!("No version file found, create dummy");
    //Force flush of stdout, else print! doesn't print instantly
    std::io::stdout().flush()?;

    File::create(path)?;
    println!(" ✓");
    Ok(())
}