use std::fmt;
use std::sync::Arc;

use chrono::{DateTime, Utc};
use rspotify::model::album::{FullAlbum, SavedAlbum, SimplifiedAlbum};

use crate::artist::Artist;
use crate::library::Library;
use crate::playable::Playable;
use crate::queue::Queue;
use crate::spotify::Spotify;
use crate::track::Track;
use crate::traits::{IntoBoxedViewExt, ListItem, ViewExt};
use crate::ui::album::AlbumView;

#[derive(Clone, Deserialize, Serialize)]
pub struct Album {
    pub id: Option<String>,
    pub title: String,
    pub artists: Vec<String>,
    pub artist_ids: Vec<String>,
    pub year: String,
    pub cover_url: Option<String>,
    pub url: Option<String>,
    pub tracks: Option<Vec<Track>>,
    pub added_at: Option<DateTime<Utc>>,
}

impl Album {
    pub fn load_tracks(&mut self, spotify: Arc<Spotify>) {
        if self.tracks.is_some() {
            return;
        }

        if let Some(ref album_id) = self.id {
            let mut collected_tracks = Vec::new();
            if let Some(full_album) = spotify.full_album(album_id) {
                let mut tracks_result = Some(full_album.tracks.clone());
                while let Some(ref tracks) = tracks_result {
                    for t in &tracks.items {
                        collected_tracks.push(Track::from_simplified_track(t, &full_album));
                    }

                    debug!("got {} tracks", tracks.items.len());

                    // load next batch if necessary
                    tracks_result = match tracks.next {
                        Some(_) => {
                            debug!("requesting tracks again..");
                            spotify.album_tracks(
                                album_id,
                                50,
                                tracks.offset + tracks.items.len() as u32,
                            )
                        }
                        None => None,
                    }
                }
            }

            self.tracks = Some(collected_tracks)
        }
    }
}

impl From<&SimplifiedAlbum> for Album {
    fn from(sa: &SimplifiedAlbum) -> Self {
        Self {
            id: sa.id.clone(),
            title: sa.name.clone(),
            artists: sa.artists.iter().map(|sa| sa.name.clone()).collect(),
            artist_ids: sa
                .artists
                .iter()
                .filter(|a| a.id.is_some())
                .map(|sa| sa.id.clone().unwrap())
                .collect(),
            year: sa
                .release_date
                .clone()
                .unwrap_or_default()
                .split('-')
                .next()
                .unwrap()
                .into(),
            cover_url: sa.images.get(0).map(|i| i.url.clone()),
            url: sa.uri.clone(),
            tracks: None,
            added_at: None,
        }
    }
}

impl From<&FullAlbum> for Album {
    fn from(fa: &FullAlbum) -> Self {
        let tracks = Some(
            fa.tracks
                .items
                .iter()
                .map(|st| Track::from_simplified_track(&st, &fa))
                .collect(),
        );

        Self {
            id: Some(fa.id.clone()),
            title: fa.name.clone(),
            artists: fa.artists.iter().map(|sa| sa.name.clone()).collect(),
            artist_ids: fa
                .artists
                .iter()
                .filter(|a| a.id.is_some())
                .map(|sa| sa.id.clone().unwrap())
                .collect(),
            year: fa.release_date.split('-').next().unwrap().into(),
            cover_url: fa.images.get(0).map(|i| i.url.clone()),
            url: Some(fa.uri.clone()),
            tracks,
            added_at: None,
        }
    }
}

impl From<&SavedAlbum> for Album {
    fn from(sa: &SavedAlbum) -> Self {
        let mut album: Self = (&sa.album).into();
        album.added_at = Some(sa.added_at);
        album
    }
}

impl fmt::Display for Album {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{} - {}", self.artists.join(", "), self.title)
    }
}

impl fmt::Debug for Album {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(
            f,
            "({} - {} ({:?}))",
            self.artists.join(", "),
            self.title,
            self.id
        )
    }
}

impl ListItem for Album {
    fn is_playing(&self, queue: Arc<Queue>) -> bool {
        if let Some(tracks) = self.tracks.as_ref() {
            let playing: Vec<String> = queue
                .queue
                .read()
                .unwrap()
                .iter()
                .filter(|t| t.id().is_some())
                .map(|t| t.id().unwrap())
                .collect();
            let ids: Vec<String> = tracks
                .iter()
                .filter(|t| t.id.is_some())
                .map(|t| t.id.clone().unwrap())
                .collect();
            !ids.is_empty() && playing == ids
        } else {
            false
        }
    }

    fn as_listitem(&self) -> Box<dyn ListItem> {
        Box::new(self.clone())
    }

    fn display_left(&self) -> String {
        format!("{}", self)
    }

    fn display_right(&self, library: Arc<Library>) -> String {
        let saved = if library.is_saved_album(self) {
            if library.cfg.values().use_nerdfont.unwrap_or(false) {
                "\u{f62b} "
            } else {
                "✓ "
            }
        } else {
            ""
        };
        format!("{}{}", saved, self.year)
    }

    fn play(&mut self, queue: Arc<Queue>) {
        self.load_tracks(queue.get_spotify());

        if let Some(tracks) = self.tracks.as_ref() {
            let tracks: Vec<Playable> = tracks
                .iter()
                .map(|track| Playable::Track(track.clone()))
                .collect();
            let index = queue.append_next(tracks);
            queue.play(index, true, true);
        }
    }

    fn play_next(&mut self, queue: Arc<Queue>) {
        self.load_tracks(queue.get_spotify());

        if let Some(tracks) = self.tracks.as_ref() {
            for t in tracks.iter().rev() {
                queue.insert_after_current(Playable::Track(t.clone()));
            }
        }
    }

    fn queue(&mut self, queue: Arc<Queue>) {
        self.load_tracks(queue.get_spotify());

        if let Some(tracks) = self.tracks.as_ref() {
            for t in tracks {
                queue.append(Playable::Track(t.clone()));
            }
        }
    }

    fn save(&mut self, library: Arc<Library>) {
        library.save_album(self);
    }

    fn unsave(&mut self, library: Arc<Library>) {
        library.unsave_album(self);
    }

    fn toggle_saved(&mut self, library: Arc<Library>) {
        if library.is_saved_album(self) {
            library.unsave_album(self);
        } else {
            library.save_album(self);
        }
    }

    fn open(&self, queue: Arc<Queue>, library: Arc<Library>) -> Option<Box<dyn ViewExt>> {
        Some(AlbumView::new(queue, library, self).as_boxed_view_ext())
    }

    fn share_url(&self) -> Option<String> {
        self.id
            .clone()
            .map(|id| format!("https://open.spotify.com/album/{}", id))
    }

    fn artist(&self) -> Option<Artist> {
        Some(Artist::new(
            self.artist_ids[0].clone(),
            self.artists[0].clone(),
        ))
    }
}