#![allow(clippy::too_many_lines)]

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

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

/// # Errors
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()
            .map_err(|_| MLErr::new(EType::Other, "ListStackLen"))?,
    ));
    download_p.set_style(
        ProgressStyle::with_template(STYLE_BAR_POS)
            .map_err(|_| MLErr::new(EType::LibIndicatif, "template error"))?
            .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)?;
        let current_version_ids =
            match userlist_get_all_current_versions_with_mods(
                config,
                &current_list.id,
            ) {
                Ok(i) => Ok(i),
                Err(e) => {
                    Err(MLErr::new(EType::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(MLErr::new(EType::Other, "IDK, WTF"))?;
                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_p.println(format!(
                "There are no new versions to download for {}",
                current_list.id
            ));
        } else {
            download_versions(
                current_list.clone(),
                config.clone(),
                get_raw_versions(&config.apis.modrinth, to_download).await?,
                &mp,
                &download_p,
            )
            .await?;
        }

        if !to_disable.is_empty() {
            let d_p =
                mp.insert_before(
                    &download_p,
                    ProgressBar::new(to_disable.len().try_into().map_err(
                        |_| MLErr::new(EType::Other, "ListStackLen"),
                    )?),
                );
            d_p.set_style(
                ProgressStyle::with_template(STYLE_BAR_POS)
                    .map_err(|_| {
                        MLErr::new(EType::LibIndicatif, "template error")
                    })?
                    .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, &ver.1)?;
                } else {
                    d_p.set_message(format!("Disable version {}", ver.1));
                    d_p.inc(1);
                    disable_version(config, &current_list, 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(())
}