use bitcode::{Decode, Encode};
use database::{
    ApplicationTransientStatus, Database, DownloadableMetadata, GameDownloadStatus, GameVersion,
    borrow_db_checked, borrow_db_mut_checked,
};
use log::{debug, error, warn};
use remote::{
    auth::generate_authorization_header, error::RemoteAccessError, requests::generate_url,
    utils::DROP_CLIENT_SYNC,
};
use serde::{Deserialize, Serialize};
use std::fs::remove_dir_all;
use std::thread::spawn;
use tauri::AppHandle;
use utils::app_emit;

use crate::state::{GameStatusManager, GameStatusWithTransient};

#[derive(Serialize, Deserialize, Debug)]
pub struct FetchGameStruct {
    game: Game,
    status: GameStatusWithTransient,
    version: Option<GameVersion>,
}

impl FetchGameStruct {
    pub fn new(game: Game, status: GameStatusWithTransient, version: Option<GameVersion>) -> Self {
        Self {
            game,
            status,
            version,
        }
    }
}

#[derive(Serialize, Deserialize, Clone, Debug, Default, Encode, Decode)]
#[serde(rename_all = "camelCase")]
pub struct Game {
    id: String,
    m_name: String,
    m_short_description: String,
    m_description: String,
    // mDevelopers
    // mPublishers
    m_icon_object_id: String,
    m_banner_object_id: String,
    m_cover_object_id: String,
    m_image_library_object_ids: Vec<String>,
    m_image_carousel_object_ids: Vec<String>,
}
impl Game {
    pub fn id(&self) -> &String {
        &self.id
    }
}
#[derive(serde::Serialize, Clone)]
pub struct GameUpdateEvent {
    pub game_id: String,
    pub status: (
        Option<GameDownloadStatus>,
        Option<ApplicationTransientStatus>,
    ),
    pub version: Option<GameVersion>,
}

/**
 * Called by:
 *  - on_cancel, when cancelled, for obvious reasons
 *  - when downloading, so if drop unexpectedly quits, we can resume the download. hidden by the "Downloading..." transient state, though
 *  - when scanning, to import the game
 */
pub fn set_partially_installed(
    meta: &DownloadableMetadata,
    install_dir: String,
    app_handle: Option<&AppHandle>,
) {
    set_partially_installed_db(&mut borrow_db_mut_checked(), meta, install_dir, app_handle);
}

pub fn set_partially_installed_db(
    db_lock: &mut Database,
    meta: &DownloadableMetadata,
    install_dir: String,
    app_handle: Option<&AppHandle>,
) {
    db_lock.applications.transient_statuses.remove(meta);
    db_lock.applications.game_statuses.insert(
        meta.id.clone(),
        GameDownloadStatus::PartiallyInstalled {
            version_name: meta.version.as_ref().unwrap().clone(),
            install_dir,
        },
    );
    db_lock
        .applications
        .installed_game_version
        .insert(meta.id.clone(), meta.clone());

    if let Some(app_handle) = app_handle {
        push_game_update(
            app_handle,
            &meta.id,
            None,
            GameStatusManager::fetch_state(&meta.id, db_lock),
        );
    }
}

pub fn uninstall_game_logic(meta: DownloadableMetadata, app_handle: &AppHandle) {
    debug!("triggered uninstall for agent");
    let mut db_handle = borrow_db_mut_checked();
    db_handle
        .applications
        .transient_statuses
        .insert(meta.clone(), ApplicationTransientStatus::Uninstalling {});

    push_game_update(
        app_handle,
        &meta.id,
        None,
        GameStatusManager::fetch_state(&meta.id, &db_handle),
    );

    let previous_state = db_handle.applications.game_statuses.get(&meta.id).cloned();

    let previous_state = if let Some(state) = previous_state {
        state
    } else {
        warn!("uninstall job doesn't have previous state, failing silently");
        return;
    };

    if let Some((_, install_dir)) = match previous_state {
        GameDownloadStatus::Installed {
            version_name,
            install_dir,
        } => Some((version_name, install_dir)),
        GameDownloadStatus::SetupRequired {
            version_name,
            install_dir,
        } => Some((version_name, install_dir)),
        GameDownloadStatus::PartiallyInstalled {
            version_name,
            install_dir,
        } => Some((version_name, install_dir)),
        _ => None,
    } {
        db_handle
            .applications
            .transient_statuses
            .insert(meta.clone(), ApplicationTransientStatus::Uninstalling {});

        drop(db_handle);

        let app_handle = app_handle.clone();
        spawn(move || {
            if let Err(e) = remove_dir_all(install_dir) {
                error!("{e}");
            } else {
                let mut db_handle = borrow_db_mut_checked();
                db_handle.applications.transient_statuses.remove(&meta);
                db_handle
                    .applications
                    .installed_game_version
                    .remove(&meta.id);
                db_handle
                    .applications
                    .game_statuses
                    .insert(meta.id.clone(), GameDownloadStatus::Remote {});
                let _ = db_handle.applications.transient_statuses.remove(&meta);

                push_game_update(
                    &app_handle,
                    &meta.id,
                    None,
                    GameStatusManager::fetch_state(&meta.id, &db_handle),
                );

                debug!("uninstalled game id {}", &meta.id);
                app_emit!(&app_handle, "update_library", ());
            }
        });
    } else {
        warn!("invalid previous state for uninstall, failing silently.");
    }
}

pub fn get_current_meta(game_id: &String) -> Option<DownloadableMetadata> {
    borrow_db_checked()
        .applications
        .installed_game_version
        .get(game_id)
        .cloned()
}

pub fn on_game_complete(
    meta: &DownloadableMetadata,
    install_dir: String,
    app_handle: &AppHandle,
) -> Result<(), RemoteAccessError> {
    // Fetch game version information from remote
    if meta.version.is_none() {
        return Err(RemoteAccessError::GameNotFound(meta.id.clone()));
    }

    let client = DROP_CLIENT_SYNC.clone();
    let response = generate_url(
        &["/api/v1/client/game/version"],
        &[
            ("id", &meta.id),
            ("version", meta.version.as_ref().unwrap()),
        ],
    )?;
    let response = client
        .get(response)
        .header("Authorization", generate_authorization_header())
        .send()?;

    let game_version: GameVersion = response.json()?;

    let mut handle = borrow_db_mut_checked();
    handle
        .applications
        .game_versions
        .entry(meta.id.clone())
        .or_default()
        .insert(meta.version.clone().unwrap(), game_version.clone());
    handle
        .applications
        .installed_game_version
        .insert(meta.id.clone(), meta.clone());

    drop(handle);

    let status = if game_version.setup_command.is_empty() {
        GameDownloadStatus::Installed {
            version_name: meta.version.clone().unwrap(),
            install_dir,
        }
    } else {
        GameDownloadStatus::SetupRequired {
            version_name: meta.version.clone().unwrap(),
            install_dir,
        }
    };

    let mut db_handle = borrow_db_mut_checked();
    db_handle
        .applications
        .game_statuses
        .insert(meta.id.clone(), status.clone());
    drop(db_handle);
    app_emit!(
        app_handle,
        &format!("update_game/{}", meta.id),
        GameUpdateEvent {
            game_id: meta.id.clone(),
            status: (Some(status), None),
            version: Some(game_version),
        }
    );

    Ok(())
}

pub fn push_game_update(
    app_handle: &AppHandle,
    game_id: &String,
    version: Option<GameVersion>,
    status: GameStatusWithTransient,
) {
    if let Some(GameDownloadStatus::Installed { .. } | GameDownloadStatus::SetupRequired { .. }) =
        &status.0
        && version.is_none()
    {
        panic!("pushed game for installed game that doesn't have version information");
    }

    app_emit!(
        app_handle,
        &format!("update_game/{game_id}"),
        GameUpdateEvent {
            game_id: game_id.clone(),
            status,
            version,
        }
    );
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct FrontendGameOptions {
    launch_string: String,
}

impl FrontendGameOptions {
    pub fn launch_string(&self) -> &String {
        &self.launch_string
    }
}