/**
 * FediStream Library JavaScript
 *
 * @package WP_FediStream
 */

( function( $ ) {
	'use strict';

	const Library = {
		currentTab: 'favorites',
		currentPage: { favorites: 1, artists: 1, history: 1 },
		currentFilter: 'all',
		isLoading: false,

		init: function() {
			this.bindEvents();
			this.loadInitialTab();
		},

		bindEvents: function() {
			const self = this;

			// Tab navigation.
			$( '.fedistream-library-nav .tab-btn' ).on( 'click', function() {
				const tab = $( this ).data( 'tab' );
				self.switchTab( tab );
			} );

			// Filter change.
			$( '.fedistream-library-filters .filter-type' ).on( 'change', function() {
				self.currentFilter = $( this ).val();
				self.currentPage.favorites = 1;
				self.loadFavorites();
			} );

			// Clear history.
			$( '.btn-clear-history' ).on( 'click', function() {
				self.clearHistory();
			} );

			// Pagination clicks.
			$( document ).on( 'click', '.library-pagination .page-btn', function() {
				const page = $( this ).data( 'page' );
				const tab = $( this ).closest( '.library-pagination' ).data( 'tab' );
				self.goToPage( tab, page );
			} );

			// Unfavorite button.
			$( document ).on( 'click', '.unfavorite-btn', function() {
				const btn = $( this );
				const contentType = btn.data( 'content-type' );
				const contentId = btn.data( 'content-id' );
				self.toggleFavorite( contentType, contentId, btn.closest( '.library-item' ) );
			} );

			// Unfollow button.
			$( document ).on( 'click', '.unfollow-btn', function() {
				const btn = $( this );
				const artistId = btn.data( 'artist-id' );
				self.toggleFollow( artistId, btn.closest( '.library-item' ) );
			} );

			// Play button.
			$( document ).on( 'click', '.play-btn', function( e ) {
				e.preventDefault();
				const trackId = $( this ).data( 'track-id' );
				self.playTrack( trackId );
			} );
		},

		loadInitialTab: function() {
			const initialTab = $( '.fedistream-library' ).data( 'initial-tab' ) || 'favorites';
			this.switchTab( initialTab );
		},

		switchTab: function( tab ) {
			this.currentTab = tab;

			// Update nav.
			$( '.fedistream-library-nav .tab-btn' ).removeClass( 'active' );
			$( '.fedistream-library-nav .tab-btn[data-tab="' + tab + '"]' ).addClass( 'active' );

			// Update content.
			$( '.tab-content' ).removeClass( 'active' );
			$( '#tab-' + tab ).addClass( 'active' );

			// Show/hide filters.
			if ( tab === 'favorites' ) {
				$( '.fedistream-library-filters' ).show();
			} else {
				$( '.fedistream-library-filters' ).hide();
			}

			// Load content.
			this.loadTabContent( tab );
		},

		loadTabContent: function( tab ) {
			switch ( tab ) {
				case 'favorites':
					this.loadFavorites();
					break;
				case 'artists':
					this.loadArtists();
					break;
				case 'history':
					this.loadHistory();
					break;
			}
		},

		loadFavorites: function() {
			const self = this;

			if ( this.isLoading ) {
				return;
			}

			this.showLoading();

			$.ajax( {
				url: fedistreamLibrary.ajaxUrl,
				type: 'POST',
				data: {
					action: 'fedistream_get_library',
					nonce: fedistreamLibrary.nonce,
					type: this.currentFilter,
					page: this.currentPage.favorites
				},
				success: function( response ) {
					self.hideLoading();

					if ( response.success ) {
						self.renderFavorites( response.data );
					} else {
						self.showError( response.data.message );
					}
				},
				error: function() {
					self.hideLoading();
					self.showError( fedistreamLibrary.i18n.error );
				}
			} );
		},

		loadArtists: function() {
			const self = this;

			if ( this.isLoading ) {
				return;
			}

			this.showLoading();

			$.ajax( {
				url: fedistreamLibrary.ajaxUrl,
				type: 'POST',
				data: {
					action: 'fedistream_get_followed_artists',
					nonce: fedistreamLibrary.nonce,
					page: this.currentPage.artists
				},
				success: function( response ) {
					self.hideLoading();

					if ( response.success ) {
						self.renderArtists( response.data );
					} else {
						self.showError( response.data.message );
					}
				},
				error: function() {
					self.hideLoading();
					self.showError( fedistreamLibrary.i18n.error );
				}
			} );
		},

		loadHistory: function() {
			const self = this;

			if ( this.isLoading ) {
				return;
			}

			this.showLoading();

			$.ajax( {
				url: fedistreamLibrary.ajaxUrl,
				type: 'POST',
				data: {
					action: 'fedistream_get_history',
					nonce: fedistreamLibrary.nonce,
					page: this.currentPage.history
				},
				success: function( response ) {
					self.hideLoading();

					if ( response.success ) {
						self.renderHistory( response.data );
					} else {
						self.showError( response.data.message );
					}
				},
				error: function() {
					self.hideLoading();
					self.showError( fedistreamLibrary.i18n.error );
				}
			} );
		},

		renderFavorites: function( data ) {
			const container = $( '.favorites-grid' );
			container.empty();

			if ( ! data.items || data.items.length === 0 ) {
				container.html( '<p class="empty-message">' + fedistreamLibrary.i18n.noFavorites + '</p>' );
				$( '.library-pagination[data-tab="favorites"]' ).empty();
				return;
			}

			data.items.forEach( function( item ) {
				container.append( this.createFavoriteItem( item ) );
			}, this );

			this.renderPagination( 'favorites', data );
		},

		renderArtists: function( data ) {
			const container = $( '.artists-grid' );
			container.empty();

			if ( ! data.artists || data.artists.length === 0 ) {
				container.html( '<p class="empty-message">' + fedistreamLibrary.i18n.noArtists + '</p>' );
				$( '.library-pagination[data-tab="artists"]' ).empty();
				return;
			}

			data.artists.forEach( function( artist ) {
				container.append( this.createArtistItem( artist ) );
			}, this );

			this.renderPagination( 'artists', data );
		},

		renderHistory: function( data ) {
			const container = $( '.history-list' );
			container.empty();

			if ( ! data.tracks || data.tracks.length === 0 ) {
				container.html( '<p class="empty-message">' + fedistreamLibrary.i18n.noHistory + '</p>' );
				$( '.library-pagination[data-tab="history"]' ).empty();
				return;
			}

			data.tracks.forEach( function( track ) {
				container.append( this.createHistoryItem( track ) );
			}, this );

			this.renderPagination( 'history', data );
		},

		createFavoriteItem: function( item ) {
			const thumbnail = item.thumbnail
				? '<img src="' + item.thumbnail + '" alt="' + this.escapeHtml( item.title ) + '">'
				: '<div class="placeholder-thumbnail"><span class="dashicons dashicons-format-audio"></span></div>';

			const playBtn = item.type === 'track'
				? '<button class="play-btn" data-track-id="' + item.id + '"><span class="dashicons dashicons-controls-play"></span></button>'
				: '';

			const artistInfo = item.artist
				? '<p class="item-artist">' + this.escapeHtml( item.artist ) + '</p>'
				: '';

			let metaInfo = '';
			if ( item.type === 'track' && item.duration ) {
				metaInfo = '<p class="item-duration">' + this.formatDuration( item.duration ) + '</p>';
			} else if ( item.type === 'album' && item.track_count ) {
				metaInfo = '<p class="item-tracks">' + item.track_count + ' tracks</p>';
			}

			return `
				<div class="library-item favorite-item" data-type="${item.type}" data-id="${item.id}">
					<div class="item-thumbnail">
						${thumbnail}
						${playBtn}
					</div>
					<div class="item-info">
						<h4 class="item-title">
							<a href="${item.permalink}">${this.escapeHtml( item.title )}</a>
						</h4>
						${artistInfo}
						${metaInfo}
					</div>
					<div class="item-actions">
						<button class="unfavorite-btn" data-content-type="${item.type}" data-content-id="${item.id}" title="Remove from library">
							<span class="dashicons dashicons-heart"></span>
						</button>
					</div>
				</div>
			`;
		},

		createArtistItem: function( artist ) {
			const thumbnail = artist.thumbnail
				? '<img src="' + artist.thumbnail + '" alt="' + this.escapeHtml( artist.name ) + '">'
				: '<div class="placeholder-thumbnail"><span class="dashicons dashicons-admin-users"></span></div>';

			const typeLabel = artist.type === 'band' ? 'Band' : 'Artist';

			return `
				<div class="library-item artist-item" data-id="${artist.id}">
					<div class="item-thumbnail artist-avatar">
						${thumbnail}
					</div>
					<div class="item-info">
						<h4 class="item-title">
							<a href="${artist.permalink}">${this.escapeHtml( artist.name )}</a>
						</h4>
						<p class="item-type">${typeLabel}</p>
					</div>
					<div class="item-actions">
						<button class="unfollow-btn" data-artist-id="${artist.id}" title="Unfollow">
							<span class="dashicons dashicons-minus"></span>
							<span class="button-text">Unfollow</span>
						</button>
					</div>
				</div>
			`;
		},

		createHistoryItem: function( track ) {
			const thumbnail = track.thumbnail
				? '<img src="' + track.thumbnail + '" alt="' + this.escapeHtml( track.title ) + '">'
				: '<div class="placeholder-thumbnail"><span class="dashicons dashicons-format-audio"></span></div>';

			const artistInfo = track.artist
				? '<p class="item-artist">' + this.escapeHtml( track.artist ) + '</p>'
				: '';

			const duration = track.duration
				? '<span class="item-duration">' + this.formatDuration( track.duration ) + '</span>'
				: '';

			return `
				<div class="library-item history-item" data-id="${track.id}">
					<div class="item-thumbnail">
						${thumbnail}
						<button class="play-btn" data-track-id="${track.id}">
							<span class="dashicons dashicons-controls-play"></span>
						</button>
					</div>
					<div class="item-info">
						<h4 class="item-title">
							<a href="${track.permalink}">${this.escapeHtml( track.title )}</a>
						</h4>
						${artistInfo}
						<p class="item-played">${this.formatPlayedTime( track.played_at )}</p>
					</div>
					<div class="item-meta">
						${duration}
					</div>
				</div>
			`;
		},

		renderPagination: function( tab, data ) {
			const container = $( '.library-pagination[data-tab="' + tab + '"]' );
			container.empty();

			if ( data.total_pages <= 1 ) {
				return;
			}

			let html = '<div class="pagination-controls">';

			// Previous button.
			if ( data.page > 1 ) {
				html += '<button class="page-btn prev" data-page="' + ( data.page - 1 ) + '">&laquo; Previous</button>';
			}

			// Page numbers.
			html += '<span class="page-info">Page ' + data.page + ' of ' + data.total_pages + '</span>';

			// Next button.
			if ( data.page < data.total_pages ) {
				html += '<button class="page-btn next" data-page="' + ( data.page + 1 ) + '">Next &raquo;</button>';
			}

			html += '</div>';

			container.html( html );
		},

		goToPage: function( tab, page ) {
			this.currentPage[ tab ] = page;
			this.loadTabContent( tab );
		},

		toggleFavorite: function( contentType, contentId, element ) {
			const self = this;

			$.ajax( {
				url: fedistreamLibrary.ajaxUrl,
				type: 'POST',
				data: {
					action: 'fedistream_toggle_favorite',
					nonce: fedistreamLibrary.nonce,
					content_type: contentType,
					content_id: contentId
				},
				success: function( response ) {
					if ( response.success && response.data.action === 'removed' ) {
						element.fadeOut( 300, function() {
							$( this ).remove();
							self.updateFavoriteCount();
						} );
					}
				},
				error: function() {
					self.showError( fedistreamLibrary.i18n.error );
				}
			} );
		},

		toggleFollow: function( artistId, element ) {
			const self = this;

			$.ajax( {
				url: fedistreamLibrary.ajaxUrl,
				type: 'POST',
				data: {
					action: 'fedistream_toggle_follow',
					nonce: fedistreamLibrary.nonce,
					artist_id: artistId
				},
				success: function( response ) {
					if ( response.success && response.data.action === 'unfollowed' ) {
						element.fadeOut( 300, function() {
							$( this ).remove();
							self.updateFollowingCount();
						} );
					}
				},
				error: function() {
					self.showError( fedistreamLibrary.i18n.error );
				}
			} );
		},

		clearHistory: function() {
			const self = this;

			if ( ! confirm( fedistreamLibrary.i18n.confirmClear ) ) {
				return;
			}

			$.ajax( {
				url: fedistreamLibrary.ajaxUrl,
				type: 'POST',
				data: {
					action: 'fedistream_clear_history',
					nonce: fedistreamLibrary.nonce
				},
				success: function( response ) {
					if ( response.success ) {
						$( '.history-list' ).html( '<p class="empty-message">' + fedistreamLibrary.i18n.noHistory + '</p>' );
						$( '.library-pagination[data-tab="history"]' ).empty();
					} else {
						self.showError( response.data.message );
					}
				},
				error: function() {
					self.showError( fedistreamLibrary.i18n.error );
				}
			} );
		},

		playTrack: function( trackId ) {
			// Trigger global player if available.
			if ( window.FediStreamPlayer && typeof window.FediStreamPlayer.playTrack === 'function' ) {
				window.FediStreamPlayer.playTrack( trackId );
			} else {
				// Fallback: redirect to track page.
				window.location.href = '?p=' + trackId;
			}
		},

		updateFavoriteCount: function() {
			const count = $( '.favorites-grid .library-item' ).length;
			$( '.tab-btn[data-tab="favorites"] .count' ).text( count );
		},

		updateFollowingCount: function() {
			const count = $( '.artists-grid .library-item' ).length;
			$( '.tab-btn[data-tab="artists"] .count' ).text( count );
		},

		showLoading: function() {
			this.isLoading = true;
			$( '.fedistream-library-loading' ).show();
		},

		hideLoading: function() {
			this.isLoading = false;
			$( '.fedistream-library-loading' ).hide();
		},

		showError: function( message ) {
			alert( message );
		},

		formatDuration: function( seconds ) {
			const mins = Math.floor( seconds / 60 );
			const secs = seconds % 60;
			return mins + ':' + ( secs < 10 ? '0' : '' ) + secs;
		},

		formatPlayedTime: function( dateString ) {
			const date = new Date( dateString );
			const now = new Date();
			const diff = Math.floor( ( now - date ) / 1000 );

			if ( diff < 60 ) {
				return 'Just now';
			} else if ( diff < 3600 ) {
				const mins = Math.floor( diff / 60 );
				return mins + ' minute' + ( mins !== 1 ? 's' : '' ) + ' ago';
			} else if ( diff < 86400 ) {
				const hours = Math.floor( diff / 3600 );
				return hours + ' hour' + ( hours !== 1 ? 's' : '' ) + ' ago';
			} else {
				const days = Math.floor( diff / 86400 );
				return days + ' day' + ( days !== 1 ? 's' : '' ) + ' ago';
			}
		},

		escapeHtml: function( text ) {
			const div = document.createElement( 'div' );
			div.textContent = text;
			return div.innerHTML;
		}
	};

	// Initialize on document ready.
	$( document ).ready( function() {
		if ( $( '.fedistream-library' ).length ) {
			Library.init();
		}
	} );

} )( jQuery );