use async_sqlite :: * ;
use async_sqlite :: Error :: * ;
use async_sqlite :: rusqlite :: OpenFlags ;
use async_sqlite :: rusqlite :: Row ;
use async_sqlite :: rusqlite :: Error :: * ;
use async_sqlite :: rusqlite :: ffi :: ErrorCode :: * ;
use fallible_iterator :: * ;
use std :: env :: * ;
use std :: path :: * ;

use crate :: error :: * ;
use crate :: error :: ZoodexError :: * ;
use crate :: utility :: * ;



pub struct DataManager {
	sqlite_client_local : Client ,
	sqlite_client_shared : Client ,
}

impl DataManager {
	pub async fn new () -> Result <Self> {
		let home_dir = var_os ("HOME") . unwrap () ;
		let xdg_data_home = var_os ("XDG_DATA_HOME") ;

		let data_dir = match xdg_data_home {
			Some (xdg_data_home) => concat_os_str ! ( xdg_data_home , "/zoodex" ) ,
			None => concat_os_str ! ( home_dir , "/.local/share/zoodex" ) ,
		} ;

		let sqlite_client_shared = ClientBuilder :: new ()
			. path ( concat_os_str ! ( & data_dir , "/shared.sqlite" ) )
			. flags ( OpenFlags :: SQLITE_OPEN_READ_ONLY | OpenFlags :: SQLITE_OPEN_NO_MUTEX )
			. open ()
			. await ? ;

		let sqlite_client_local = ClientBuilder :: new ()
			. path ( concat_os_str ! ( & data_dir , "/shared.sqlite" ) )
			. flags ( OpenFlags :: SQLITE_OPEN_READ_WRITE | OpenFlags :: SQLITE_OPEN_NO_MUTEX )
			. open ()
			. await ? ;

		Ok ( Self {
			sqlite_client_local ,
			sqlite_client_shared ,
		} )
	}

	pub async fn get_collection_overview ( & self ) -> Result <CollectionOverview> {
		let collection_overview = self . sqlite_client_shared . conn ( |sqlite_connection| {
			let films = sqlite_connection
				. prepare ( "
					select uuid , name , original_name , release_date , runtime_minutes , poster_file_path
					from films
				" ) ?
				. query (()) ?
				. map (row_to_film_overview)
				. collect () ? ;

			let series = sqlite_connection
				. prepare ( "
					select series . uuid , series . name , series . original_name , series . poster_file_path ,
						min ( episodes . release_date )
					from series , seasons , episodes
					where series . uuid = seasons . series and seasons . uuid = episodes . season
					group by series . uuid
				" ) ?
				. query (()) ?
				. map (row_to_series_overview)
				. collect () ? ;

			Ok ( CollectionOverview { films , series } )
		} ) . await ? ;
		Ok (collection_overview)
	}

	pub async fn get_film_details ( & self , uuid : String ) -> Result <FilmDetails> {
		let film_details = self . sqlite_client_shared . conn ( |sqlite_connection| {
			let film_details = sqlite_connection
				. prepare ( "
					select
						films . uuid ,
						films . name ,
						films . original_name ,
						films . release_date ,
						films . runtime_minutes ,
						films . poster_file_path ,
						sources . media_uuid ,
						sources . bittorrent_hash ,
						sources . file_path ,
						sources . audio_track ,
						sources . subtitle_track
					from films left join sources
					on films . uuid = sources . media_uuid
					where films . uuid = (?1)
				" ) ?
				. query ( [ uuid ] ) ?
				. map (row_to_film_details)
				. next () ?
				. unwrap () ;
			Ok (film_details)
		} ) . await ? ;
		Ok (film_details)
	}
}



pub struct CollectionOverview {
	pub films : Vec <FilmOverview> ,
	pub series : Vec <SeriesOverview> ,
}

pub trait MediaOverview : Clone {
	fn get_uuid ( & self ) -> String ;
	fn get_name ( & self ) -> String ;
	fn get_original_name ( & self ) -> Option <String> ;
	fn get_release_date ( & self ) -> String ;
	fn get_runtime_minutes ( & self ) -> Option <u32> ;
	fn get_poster_file_path ( & self ) -> Option <PathBuf> ;
}

# [ derive (Clone) ] pub struct FilmOverview {
	pub uuid : String ,
	pub name : String ,
	pub original_name : Option <String> ,
	pub release_date : String ,  // TODO: Switch to chrono types, I think rusqlite has crate option for it
	pub runtime_minutes : u32 ,
	pub poster_file_path : Option <PathBuf> ,
}
# [ derive (Clone) ] pub struct SeriesOverview {
	pub uuid : String ,
	pub name : String ,
	pub original_name : Option <String> ,
	pub first_release_date : String ,  // TODO: Switch to chrono types, I think rusqlite has crate option for it
	pub poster_file_path : Option <PathBuf> ,
}

impl MediaOverview for FilmOverview {
	fn get_uuid ( & self ) -> String { self . uuid . clone () }
	fn get_name ( & self ) -> String { self . name . clone () }
	fn get_original_name ( & self ) -> Option <String> { self . original_name . clone () }
	fn get_release_date ( & self ) -> String { self . release_date . clone () }
	fn get_runtime_minutes ( & self ) -> Option <u32> { Some ( self . runtime_minutes ) }
	fn get_poster_file_path ( & self ) -> Option <PathBuf> { self . poster_file_path . clone () }
}
impl MediaOverview for SeriesOverview {
	fn get_uuid ( & self ) -> String { self . uuid . clone () }
	fn get_name ( & self ) -> String { self . name . clone () }
	fn get_original_name ( & self ) -> Option <String> { self . original_name . clone () }
	fn get_release_date ( & self ) -> String { self . first_release_date . clone () }
	fn get_runtime_minutes ( & self ) -> Option <u32> { None }
	fn get_poster_file_path ( & self ) -> Option <PathBuf> { self . poster_file_path . clone () }
}

fn row_to_film_overview ( row : & Row ) -> rusqlite :: Result <FilmOverview> {
	let uuid = row . get (0) ? ;
	let name = row . get (1) ? ;
	let original_name = row . get (2) ? ;
	let release_date = row . get (3) ? ;
	let runtime_minutes = row . get (4) ? ;
	let poster_file_path = row . get :: < _ , Option <String> > (5) ?
		. map ( PathBuf :: from ) ;

	Ok ( FilmOverview {
		uuid ,
		name ,
		original_name ,
		release_date ,
		runtime_minutes ,
		poster_file_path ,
	} )
}
fn row_to_series_overview ( row : & Row ) -> rusqlite :: Result <SeriesOverview> {
	let uuid = row . get (0) ? ;
	let name = row . get (1) ? ;
	let original_name = row . get (2) ? ;
	let poster_file_path = row. get :: < _ , Option <String> > (3) ?
		. map ( PathBuf :: from ) ;
	let first_release_date = row . get (4) ? ;

	Ok ( SeriesOverview {
		uuid ,
		name ,
		original_name ,
		first_release_date ,
		poster_file_path ,
	} )
}



# [ derive (Clone) ] pub struct FilmDetails {
	pub uuid : String ,
	pub name : String ,
	pub original_name : Option <String> ,
	pub release_date : String ,
	pub runtime_minutes : u32 ,
	pub poster_file_path : Option <PathBuf> ,
	pub source : Option <SourceDetails> ,
}
# [ derive (Clone) ] pub struct SourceDetails {
	pub bittorrent_hash : String ,
	pub file_path : PathBuf ,
	pub audio_track : Option <u32> ,
	pub subtitle_track : Option <u32> ,
}

fn row_to_film_details ( row : & Row ) -> rusqlite :: Result <FilmDetails> {
	let uuid = row . get (0) ? ;
	let name = row . get (1) ? ;
	let original_name = row . get (2) ? ;
	let release_date = row . get (3) ? ;
	let runtime_minutes = row . get (4) ? ;
	let poster_file_path = row . get :: < _ , Option <String> > (5) ? . map ( PathBuf :: from ) ;

	let source_media_uuid = row . get :: < _ , Option <String> > (6) ? ;
	let source = match source_media_uuid {
		Some (_) => {
			let bittorrent_hash = row . get (7) ? ;
			let file_path = PathBuf :: from ( row . get :: < _ , String > (8) ? ) ;
			let audio_track = row . get (9) ? ;
			let subtitle_track = row . get (10) ? ;

			Some ( SourceDetails {
				bittorrent_hash ,
				file_path ,
				audio_track ,
				subtitle_track ,
			} )
		} ,
		None => None ,
	} ;

	Ok ( FilmDetails {
		uuid ,
		name ,
		original_name ,
		release_date ,
		runtime_minutes ,
		poster_file_path ,
		source ,
	} )
}



impl From <Error> for ZoodexError {
	fn from ( error : Error ) -> Self {
		match error {
			Rusqlite (error) => ZoodexError :: from (error) ,
			_ => panic ! ( "{}" , error ) ,
		}
	}
}

impl From < rusqlite :: Error > for ZoodexError {
	fn from ( error : rusqlite :: Error ) -> Self {
		match error {
			SqliteFailure ( error , _ ) => {
				match error . code {
					CannotOpen => CollectionFileReadError ,
					_ => panic ! ( "{}" , error ) ,
				}
			} ,
			_ => panic ! ( "{}" , error ) ,
		}
	}
}