use std::io::{Error, ErrorKind};

use crate::{modrinth::{project, versions, extract_current_version, Version}, config::Cfg, db::{mods_insert, userlist_remove, mods_get_id, userlist_insert, mods_get_all_ids, userlist_get_all_ids, userlist_get_current_version, lists_get_all_ids, mods_remove}, input::{Input, Subcmd}, get_current_list, files::{delete_version, download_versions}};

pub async fn modification(config: Cfg, input: Input) -> Result<(), Box<dyn std::error::Error>> {
    
    match input.subcommand.as_ref().ok_or("")? {
        Subcmd::Add => {
            add(config, input).await
        },
        Subcmd::Remove => {
            remove(config, input.args.ok_or("")?)
        },
        _ => Err(Box::new(Error::new(ErrorKind::InvalidInput, "SUBCOMMAND_NOT_AVAILABLE")))
    }
}

async fn add(config: Cfg, input: Input) -> Result<(), Box<dyn std::error::Error>> {

    let args = input.args.ok_or("")?;

    if args.is_empty() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
    
    let current_list = get_current_list(config.clone())?;

    let project = project(String::from(&config.apis.modrinth), &args[0]).await;

    let available_versions = versions(String::from(&config.apis.modrinth), String::from(&project.id), current_list.clone()).await;

    let mut available_versions_vec: Vec<String> = Vec::new();
    let current_version: Option<Version>;
    let current_version_id: String;
    let file: String;
    if !available_versions.is_empty() {
        let current_id = extract_current_version(available_versions.clone())?;

        current_version = Some(available_versions.clone().into_iter().find(|v| v.id == current_id).unwrap());

        current_version_id = current_version.clone().unwrap().id;

        file = current_version.clone().ok_or("VERSION_CORRUPTED")?.files.into_iter().find(|f| f.primary).unwrap().url;

        for ver in available_versions {
            available_versions_vec.push(ver.id);
        };
    } else {
        println!("There's currently no mod version for your specified target");
        current_version = None;
        current_version_id = String::from("NONE");
        file = String::from("NONE");
        available_versions_vec.push(String::from("NONE"));
    }

    //add to current list and mod table
    match userlist_get_all_ids(config.clone(), current_list.clone().id) {
        Ok(mods) => {
            if mods.contains(&project.id) {
                return Err(Box::new(Error::new(ErrorKind::Other, "MOD_ALREADY_ON_LIST"))); } 
            else {
                userlist_insert(config.clone(), String::from(&current_list.id), String::from(&project.id), String::from(&current_version_id), available_versions_vec, file)?;
            } 
        },
        Err(..) => userlist_insert(config.clone(), String::from(&current_list.id), String::from(&project.id), String::from(&current_version_id), available_versions_vec, file)?,
    };
    
    match mods_get_all_ids(config.clone()) {
        Ok(mods) => {
            if mods.contains(&project.id) {
                //return Err(Box::new(Error::new(ErrorKind::Other, "MOD_ALREADY_IN_DATABASE")))
            } else {
                mods_insert(config.clone(), String::from(&project.id), String::from(&project.title), project.versions)?;
            } 
        },
        Err(..) => {
            mods_insert(config.clone(), String::from(&project.id), String::from(&project.title), project.versions)?;
        },
    };
    
    if !input.disable_download && current_version.is_some() { download_versions(current_list, vec![current_version.unwrap()]).await?; }

    Ok(())
}

fn remove(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
    if args.is_empty() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };

    let current_list = get_current_list(config.clone())?;
    let mod_id = mods_get_id(config.clone(), String::from(&args[0]))?;
    
    let version = userlist_get_current_version(config.clone(), String::from(&current_list.id), String::from(&mod_id))?;

    //TODO implement remove from modlist if not in any other lists && config clean is true
    userlist_remove(config.clone(), String::from(&current_list.id), String::from(&mod_id))?;
    delete_version(current_list, version)?;
    
    let list_ids = lists_get_all_ids(config.clone())?;
    
    let mut mod_used = false;
    for id in list_ids {
        let mods = userlist_get_all_ids(config.clone(), id)?;
        if mods.contains(&mod_id) { mod_used = true; break; };
    };

    if !mod_used { mods_remove(config, mod_id)?; };

    Ok(())
}