use indicatif::{MultiProgress, ProgressStyle, ProgressBar};

use crate::{STYLE_BAR_POS, PROGRESS_CHARS};
use crate::{config::Cfg, List};
use crate::{
    db::userlist_get_all_current_versions_with_mods,
    error::{ErrorType, MLError, MLE},
    files::{
        clean_list_dir, delete_version, disable_version, download_versions, get_downloaded_versions,
    },
    modrinth::get_raw_versions,
};

pub async fn download(config: &Cfg, liststack: Vec<List>, clean: bool, delete_old: bool) -> MLE<()> {

    let mp = MultiProgress::new();
    let download_p = mp.add(ProgressBar::new(liststack.len().try_into().unwrap()));
    download_p.set_style(ProgressStyle::with_template(STYLE_BAR_POS).unwrap().progress_chars(PROGRESS_CHARS));

    for current_list in liststack {
        download_p.set_message(format!("Download in {}", current_list.id));

        let downloaded_versions = get_downloaded_versions(current_list.clone())?;
        let current_version_ids = match userlist_get_all_current_versions_with_mods(
            config,
            String::from(&current_list.id),
        ) {
            Ok(i) => Ok(i),
            Err(e) => Err(MLError::new(ErrorType::DBError, e.to_string().as_str())),
        }?;

        let mut to_download: Vec<String> = vec![];
        //(mod_id, version_id)
        let mut to_disable: Vec<(String, String)> = vec![];

        for version in current_version_ids {
            let mod_id = version.0;
            let current_version = version.1;

            let current_download = downloaded_versions.get(&mod_id);

            if current_download.is_none() || clean {
                to_download.push(current_version);
            } else {
                let downloaded_version = current_download
                    .ok_or("SOMETHING_HAS_REALLY_GONE_WRONG")
                    .unwrap();
                if &current_version != downloaded_version {
                    to_disable.push((mod_id.clone(), String::from(downloaded_version)));
                    to_download.push(current_version);
                }
            }
        }

        if clean {
            clean_list_dir(&current_list)?
        };

        if !to_download.is_empty() {
            download_versions(
                current_list.clone(),
                config.clone(),
                get_raw_versions(&config.apis.modrinth, to_download).await,
                &mp,
                &download_p,
            )
            .await?;
        } else {
            download_p.println(format!("There are no new versions to download for {}", current_list.id));
        }

        if !to_disable.is_empty() {
            let d_p = mp.insert_before(&download_p, ProgressBar::new(to_disable.len().try_into().unwrap()));
            d_p.set_style(ProgressStyle::with_template(STYLE_BAR_POS).unwrap().progress_chars(PROGRESS_CHARS));
            for ver in to_disable {
                if delete_old {
                    d_p.set_message(format!("Delete version {}", ver.1));
                    d_p.inc(1);
                    delete_version(current_list.clone(), ver.1)?;
                } else {
                    d_p.set_message(format!("Disable version {}", ver.1));
                    d_p.inc(1);
                    disable_version(config, current_list.clone(), ver.1, ver.0)?;
                };
            }

            let del_msg = if delete_old {
                "Deleted all old versions"
            } else {
                "Disabled all old versions"
            };

            d_p.finish_with_message(del_msg);
        }

        download_p.inc(1);
    }

    download_p.finish_with_message("Downloaded all lists");

    Ok(())
}