use {
	gtk4 :: {
		* ,
		Align :: * ,
		Orientation :: * ,
		gdk :: Texture ,
		prelude :: * ,
	} ,
	std :: { cell :: * , iter :: * , path :: Path } ,
} ;

use crate :: { collection :: * , ui :: component :: * } ;



pub enum FilmsSortedBy { Name , ReleaseDate , Runtime }
pub enum SeriesSortedBy { Name , FirstReleaseDate }

pub struct CollatedFilmsGrid {
	film_widget_pairs : RefCell < Vec < ( Film , Box ) > > ,
	grid_widget : FlowBox ,
}
pub struct CollatedSeriesGrid {
	series_widget_pairs : RefCell < Vec < ( Series , Box ) > > ,
	grid_widget : FlowBox ,
}

impl CollatedFilmsGrid {
	pub fn new ( films : Vec <Film> , sorting : FilmsSortedBy ) -> Self {
		let grid_widget = create_flow_box () ;
		let film_widget_pairs = RefCell :: new ( vec ! () ) ;

		let component = Self { film_widget_pairs , grid_widget } ;
		component . set_films ( films , sorting ) ;

		component
	}

	pub fn set_films ( & self , films : Vec <Film> , sorting : FilmsSortedBy ) {
		let widgets = films . iter ()
			. map (create_film_entry)
			. collect :: < Vec <_> > () ;
		* self . film_widget_pairs . borrow_mut () = zip ( films , widgets )
			. collect () ;

		for ( _ , film_widget ) in self . sort_film_widget_pairs (sorting) {
			self . grid_widget . append ( & film_widget ) ;
		}
	}

	pub fn set_sorting ( & self , sorting : FilmsSortedBy ) {
		self . grid_widget . remove_all () ;

		for ( _ , film_widget ) in self . sort_film_widget_pairs (sorting) {
			self . grid_widget . append ( & film_widget ) ;
		}
	}

	fn sort_film_widget_pairs ( & self , sorting : FilmsSortedBy ) -> Vec < ( Film , Box ) > {
		let mut sorted = Vec :: from (
			self . film_widget_pairs . borrow () . as_slice () ) ;

		sorted . sort_by ( | ( film_1 , _ ) , ( film_2 , _ ) | match sorting {
			FilmsSortedBy :: Name =>
				film_1 . name . cmp ( & film_2 . name ) ,
			FilmsSortedBy :: ReleaseDate =>
				film_1 . release_date . cmp ( & film_2 . release_date ) ,
			FilmsSortedBy :: Runtime =>
				film_1 . runtime_minutes . cmp ( & film_2 . runtime_minutes ) ,
		} ) ;

		sorted
	}
}
impl CollatedSeriesGrid {
	pub fn new ( series : Vec <Series> , sorting : SeriesSortedBy ) -> Self {
		let grid_widget = create_flow_box () ;
		let series_widget_pairs = RefCell :: new ( vec ! () ) ;

		let component = Self { series_widget_pairs , grid_widget } ;
		component . set_series ( series, sorting ) ;

		component
	}

	pub fn set_series ( & self , series : Vec <Series> , sorting : SeriesSortedBy ) {
		let widgets = series . iter ()
			. map (create_series_entry)
			. collect :: < Vec <_> > () ;
		* self . series_widget_pairs . borrow_mut () = zip ( series , widgets )
			. collect () ;

		for ( _ , series_widget ) in self . sort_series_widget_pairs (sorting) {
			self . grid_widget . append ( & series_widget ) ;
		}
	}

	pub fn set_sorting ( & self , sorting : SeriesSortedBy ) {
		self . grid_widget . remove_all () ;

		for ( _ , series_widget ) in self . sort_series_widget_pairs (sorting) {
			self . grid_widget . append ( & series_widget ) ;
		}
	}

	fn sort_series_widget_pairs ( & self , sorting : SeriesSortedBy ) -> Vec < ( Series , Box ) > {
		let mut sorted = Vec :: from (
			self . series_widget_pairs . borrow () . as_slice () ) ;

		sorted . sort_by ( | ( series_1 , _ ) , ( series_2 , _ ) | match sorting {
			SeriesSortedBy :: Name => series_1 . name . cmp ( & series_2 . name ) ,
			SeriesSortedBy :: FirstReleaseDate => todo ! () ,
		} ) ;

		sorted
	}
}

impl Component <FlowBox> for CollatedFilmsGrid {
	fn get_widget ( & self ) -> & FlowBox { & self . grid_widget }
}
impl Component <FlowBox> for CollatedSeriesGrid {
	fn get_widget ( & self ) -> & FlowBox { & self . grid_widget }
}

fn create_flow_box () -> FlowBox {
	FlowBox :: builder ()
		. orientation (Horizontal)
		. homogeneous (true)
		. selection_mode ( SelectionMode :: None )
		. build ()
}

pub fn create_film_entry ( film : & Film ) -> Box {
	create_collection_item (
		film . name . as_str () ,
		film . original_name . as_deref () ,
		film . poster_file_path . as_deref () ,
		& create_film_details (film) ,
	)
}
pub fn create_series_entry ( series : & Series ) -> Box {
	create_collection_item (
		series . name . as_str () ,
		series . original_name . as_deref () ,
		series . poster_file_path . as_deref () ,
		& create_series_details (series) ,
	)
}

fn create_collection_item (
	name : & str ,
	original_name : Option < & str > ,
	poster_file_path : Option < & Path > ,
	details_widget : & Box ,
) -> Box {
	let container = Box :: builder ()
		. orientation (Vertical)
		. margin_top (20)
		. margin_bottom (20)
		. build () ;

	if let Some (poster_file_path) = poster_file_path {
		let poster_texture = Texture :: from_filename (poster_file_path) . unwrap () ;
		container . append (
			& Image :: builder ()
				. paintable ( & poster_texture )
				. width_request (300)
				. height_request (300)
				. margin_bottom (10)
				. build ()
		) ;
	}

	container . append (
		& Label :: builder ()
			. label ( format ! ( "<span size='large' weight='bold'>{}</span>" , name ) )
			. use_markup (true)
			. justify ( Justification :: Center )
			. wrap (true)
			. max_width_chars (1)  // Not the actual limit, used instead to wrap more aggressively
			. build ()
	) ;

	if let Some (original_name) = original_name {
		container . append (
			& Label :: builder ()
				. label (original_name)
				. justify ( Justification :: Center )
				. wrap (true)
				. max_width_chars (1)  // Not the actual limit, used instead to wrap more aggressively
				. build ()
		) ;
	}

	container . append (details_widget) ;

	container
}

fn create_film_details ( film : & Film ) -> Box {
	let container = Box :: builder ()
		. orientation (Horizontal)
		. halign (Center)
		. spacing (20)
		. build () ;

	container . append (
		& Label :: builder () . label ( & film . release_date ) . build ()
	) ;
	container . append (
		& Label :: builder () . label ( format ! ( "{}m" , film . runtime_minutes ) ) . build ()
	) ;

	container
}
fn create_series_details ( series : & Series ) -> Box {
	let container = Box :: builder ()
		. orientation (Horizontal)
		. halign (Center)
		. spacing (20)
		. build () ;

	// TODO

	container
}