use crate::{modrinth::{project, versions, extract_current_version, Version, projects}, config::Cfg, db::{mods_insert, userlist_remove, mods_get_id, userlist_insert, userlist_get_all_ids, userlist_get_current_version, lists_get_all_ids, mods_remove}, input::{Input, ModOptions}, files::{delete_version, download_versions}, List, error::{MLE, ErrorType, MLError}};

//TODO DO IT
pub struct ModVer {

}

pub async fn modification(config: Cfg, input: Input) -> MLE<()> {
    match input.clone().mod_options.ok_or("").unwrap() {
        ModOptions::Add => {
            add(config, input).await
        },
        ModOptions::Remove => {
            remove(config, input)
        },
    }
}

async fn add(config: Cfg, input: Input) -> MLE<()> {

    mods_add(config, vec![input.mod_id.unwrap()], input.list.unwrap(), input.direct_download, input.set_version).await?;

    Ok(())
}
//TODO impl specific version
pub async fn mods_add(config: Cfg, mod_id: Vec<String>, list: List, direct_download: bool, set_version: bool) -> MLE<()> {
    
    println!("Add mods to {}", list.id);
    println!("  └Add mods:");
    let projects = if mod_id.len() == 1 {
        vec![project(String::from(&config.apis.modrinth), &mod_id[0]).await]
    } else {
        projects(String::from(&config.apis.modrinth), mod_id).await
    };

    let mut downloadstack: Vec<Version> = Vec::new();
    
    for project in projects {
        println!("\t└{}", project.title);
        println!("\t  └Get versions");
        let available_versions = versions(String::from(&config.apis.modrinth), String::from(&project.id), 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())?;
            println!("\t  └Current version: {}", current_id);

            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("").unwrap().files.into_iter().find(|f| f.primary).unwrap().url;
            for ver in available_versions {
                available_versions_vec.push(ver.id);
            };
        } else {
            println!("\t  └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"));
        }

        match userlist_insert(config.clone(), &list.id, &project.id, &current_version_id, available_versions_vec, &file, set_version) {
            Err(e) => {
                let expected_err = format!("SQL: UNIQUE constraint failed: {}.mod_id", list.id);
                if e.to_string() == expected_err { Err(MLError::new(ErrorType::ModError, "MOD_ALREADY_ON_SELECTED_LIST")) } else { Err(e) }
            },
            Ok(..) => { Ok(..) },
        }?;
        
        match mods_insert(config.clone(), &project.id, &project.slug, &project.title) {
            Err(e) => {
                if e.to_string() == "SQL: UNIQUE constraint failed: mods.id" { Ok(..) } else { Err(e) }
            },
            Ok(..) => Ok(..),
        }?;

        downloadstack.push(current_version.unwrap());
    };

    //Download all the added mods
    if direct_download { 
        download_versions(list.clone(), config.clone(), downloadstack).await?;
    };

    Ok(())
}

fn remove(config: Cfg, input: Input) -> MLE<()> {

    let mod_id = mods_get_id(&config.data, input.mod_id.as_ref().unwrap())?;
    
    let version = userlist_get_current_version(config.clone(), input.clone().list.unwrap().id, String::from(&mod_id))?;

    userlist_remove(config.clone(), input.clone().list.unwrap().id, String::from(&mod_id))?;
    delete_version(input.list.unwrap(), 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(())
}