use crate::{config::Cfg, get_current_list, List};
use crate::{
    db::{lists_get, lists_get_all_ids, 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, all_lists: bool, clean: bool, delete_old: bool) -> MLE<()> {
    let mut liststack: Vec<List> = vec![];
    if all_lists {
        let list_ids = lists_get_all_ids(config.clone())?;
        for id in list_ids {
            liststack.push(lists_get(config.clone(), id)?);
        }
    } else {
        let current = get_current_list(config.clone())?;
        println!("Downloading current versions of mods in {}", current.id);
        liststack.push(current)
    }

    for current_list in liststack {
        let downloaded_versions = get_downloaded_versions(current_list.clone())?;
        println!("To download: {:#?}", downloaded_versions);
        let current_version_ids = match userlist_get_all_current_versions_with_mods(
            config.clone(),
            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,
            )
            .await?;
        } else {
            println!("There are no new versions to download");
        }

        if !to_disable.is_empty() {
            for ver in to_disable {
                if delete_old {
                    println!("Deleting version {} for mod {}", ver.1, ver.0);
                    delete_version(current_list.clone(), ver.1)?;
                } else {
                    disable_version(config.clone(), current_list.clone(), ver.1, ver.0)?;
                };
            }
        }
    }

    Ok(())
}