use serde::{Deserialize, Serialize};
use std::fs::File;
use std::io::prelude::*;

use crate::{
    config::Cfg,
    db::{lists_get, lists_get_all_ids, lists_insert, userlist_get_all_ids},
    error::MLE,
    mod_add, IDSelector, List, Modloader,
};

#[derive(Debug, Serialize, Deserialize)]
struct Export {
    lists: Vec<ExportList>,
}

#[derive(Debug, Serialize, Deserialize)]
struct ExportList {
    id: String,
    mods: String,
    launcher: String,
    mc_version: String,
    download_folder: Option<String>,
}

impl ExportList {
    pub fn from(config: Cfg, list_id: String, download: bool) -> MLE<Self> {
        let list = lists_get(config.clone(), String::from(&list_id))?;

        let mut dl_folder = None;
        if download {
            dl_folder = Some(list.download_folder)
        };

        let mods = userlist_get_all_ids(config, list_id)?.join("|");

        Ok(Self {
            id: list.id,
            mods,
            launcher: list.modloader.to_string(),
            mc_version: list.mc_version,
            download_folder: dl_folder,
        })
    }
}

pub fn export(config: Cfg, list: Option<String>) -> MLE<()> {
    let mut list_ids: Vec<String> = vec![];
    if list.is_none() {
        list_ids = lists_get_all_ids(config.clone())?;
    } else {
        list_ids.push(lists_get(config.clone(), list.unwrap())?.id);
    }
    let mut lists: Vec<ExportList> = vec![];
    for list_id in list_ids {
        lists.push(ExportList::from(config.clone(), list_id, true)?);
    }

    let toml = toml::to_string(&Export { lists })?;

    let filestr = dirs::home_dir().unwrap().join("mlexport.toml");

    let mut file = File::create(filestr.into_os_string().into_string().unwrap().as_str())?;
    file.write_all(toml.as_bytes())?;

    Ok(())
}

pub async fn import(config: Cfg, file_str: String, direct_download: bool) -> MLE<()> {
    let mut file = File::open(file_str)?;
    let mut content = String::new();
    file.read_to_string(&mut content)?;
    let export: Export = toml::from_str(&content)?;

    for exportlist in export.lists {
        let list = List {
            id: exportlist.id,
            mc_version: exportlist.mc_version,
            modloader: Modloader::from(&exportlist.launcher)?,
            download_folder: exportlist.download_folder.ok_or("NO_DL").unwrap(),
        };
        lists_insert(
            config.clone(),
            list.id.clone(),
            list.mc_version.clone(),
            list.modloader.clone(),
            String::from(&list.download_folder),
        )?;
        let mods: Vec<&str> = exportlist.mods.split('|').collect();
        let mut mod_ids = vec![];
        for mod_id in mods {
            mod_ids.push(IDSelector::ModificationID(String::from(mod_id)));
        }
        //TODO impl set_version and good direct download
        //TODO impl all at once, dafuck
        mod_add(config.clone(), mod_ids, list, direct_download, false).await?;
    }
    Ok(())
}