//js/events.js
import { SVG_PLAY, SVG_PAUSE, SVG_VOLUME, SVG_MUTE, REPEAT_MODE, trackDataStore, RATE_LIMIT_ERROR_MESSAGE, buildTrackFilename, getTrackTitle } from './utils.js';
import { lastFMStorage } from './storage.js';
import { showNotification, downloadTrackWithMetadata } from './downloads.js';
import { lyricsSettings } from './storage.js';
import { updateTabTitle } from './router.js';
import { db } from './db.js';

export function initializePlayerEvents(player, audioPlayer, scrobbler) {
    const playPauseBtn = document.querySelector('.play-pause-btn');
    const nextBtn = document.getElementById('next-btn');
    const prevBtn = document.getElementById('prev-btn');
    const shuffleBtn = document.getElementById('shuffle-btn');
    const repeatBtn = document.getElementById('repeat-btn');

    // Sync UI with player state on load
    if (player.shuffleActive) {
        shuffleBtn.classList.add('active');
    }

    if (player.repeatMode !== REPEAT_MODE.OFF) {
        repeatBtn.classList.add('active');
        if (player.repeatMode === REPEAT_MODE.ONE) {
            repeatBtn.classList.add('repeat-one');
        }
        repeatBtn.title = player.repeatMode === REPEAT_MODE.ALL ? 'Repeat Queue' : 'Repeat One';
    } else {
        repeatBtn.title = 'Repeat';
    }

    audioPlayer.addEventListener('play', () => {
        if (scrobbler.isAuthenticated() && lastFMStorage.isEnabled() && player.currentTrack) {
            scrobbler.updateNowPlaying(player.currentTrack);
        }
        playPauseBtn.innerHTML = SVG_PAUSE;
        player.updateMediaSessionPlaybackState();
        player.updateMediaSessionPositionState();
        updateTabTitle(player);
    });

    audioPlayer.addEventListener('playing', () => {
        player.updateMediaSessionPlaybackState();
        player.updateMediaSessionPositionState();
    });

    audioPlayer.addEventListener('pause', () => {
        playPauseBtn.innerHTML = SVG_PLAY;
        player.updateMediaSessionPlaybackState();
        player.updateMediaSessionPositionState();
    });

    audioPlayer.addEventListener('ended', () => {
        player.playNext();
    });

    audioPlayer.addEventListener('timeupdate', () => {
        const { currentTime, duration } = audioPlayer;
        if (duration) {
            const progressFill = document.getElementById('progress-fill');
            const currentTimeEl = document.getElementById('current-time');
            progressFill.style.width = `${(currentTime / duration) * 100}%`;
            currentTimeEl.textContent = formatTime(currentTime);
        }
    });

    audioPlayer.addEventListener('loadedmetadata', () => {
        const totalDurationEl = document.getElementById('total-duration');
        totalDurationEl.textContent = formatTime(audioPlayer.duration);
        player.updateMediaSessionPositionState();
    });

    audioPlayer.addEventListener('error', (e) => {
        console.error('Audio playback error:', e);
        document.querySelector('.now-playing-bar .artist').textContent = 'Playback error. Try another track.';
        playPauseBtn.innerHTML = SVG_PLAY;
    });

    playPauseBtn.addEventListener('click', () => player.handlePlayPause());
    nextBtn.addEventListener('click', () => player.playNext());
    prevBtn.addEventListener('click', () => player.playPrev());

    shuffleBtn.addEventListener('click', () => {
        player.toggleShuffle();
        shuffleBtn.classList.toggle('active', player.shuffleActive);
        renderQueue(player);
    });

    repeatBtn.addEventListener('click', () => {
        const mode = player.toggleRepeat();
        repeatBtn.classList.toggle('active', mode !== REPEAT_MODE.OFF);
        repeatBtn.classList.toggle('repeat-one', mode === REPEAT_MODE.ONE);
        repeatBtn.title = mode === REPEAT_MODE.OFF
            ? 'Repeat'
            : (mode === REPEAT_MODE.ALL ? 'Repeat Queue' : 'Repeat One');
    });

    // Volume controls
    const volumeBar = document.getElementById('volume-bar');
    const volumeFill = document.getElementById('volume-fill');
    const volumeBtn = document.getElementById('volume-btn');

    const updateVolumeUI = () => {
        const { volume, muted } = audioPlayer;
        volumeBtn.innerHTML = (muted || volume === 0) ? SVG_MUTE : SVG_VOLUME;
        const effectiveVolume = muted ? 0 : volume * 100;
        volumeFill.style.setProperty('--volume-level', `${effectiveVolume}%`);
        volumeFill.style.width = `${effectiveVolume}%`;
    };

    volumeBtn.addEventListener('click', () => {
        audioPlayer.muted = !audioPlayer.muted;
        localStorage.setItem('muted', audioPlayer.muted);
    });

    audioPlayer.addEventListener('volumechange', updateVolumeUI);

    // Initialize volume and mute from localStorage
    const savedVolume = parseFloat(localStorage.getItem('volume') || '0.7');
    const savedMuted = localStorage.getItem('muted') === 'true';

    audioPlayer.volume = savedVolume;
    audioPlayer.muted = savedMuted;

    volumeFill.style.width = `${savedVolume * 100}%`;
    volumeBar.style.setProperty('--volume-level', `${savedVolume * 100}%`);
    updateVolumeUI();

    initializeSmoothSliders(audioPlayer, player);
}

function initializeSmoothSliders(audioPlayer, player) {
    const progressBar = document.getElementById('progress-bar');
    const progressFill = document.getElementById('progress-fill');
    const volumeBar = document.getElementById('volume-bar');
    const volumeFill = document.getElementById('volume-fill');

    let isSeeking = false;
    let wasPlaying = false;
    let isAdjustingVolume = false;

    const seek = (bar, event, setter) => {
        const rect = bar.getBoundingClientRect();
        const position = Math.max(0, Math.min(1, (event.clientX - rect.left) / rect.width));
        setter(position);
    };

    // Progress bar with smooth dragging
    progressBar.addEventListener('mousedown', (e) => {
        isSeeking = true;
        wasPlaying = !audioPlayer.paused;
        if (wasPlaying) audioPlayer.pause();

        seek(progressBar, e, position => {
            if (!isNaN(audioPlayer.duration)) {
                audioPlayer.currentTime = position * audioPlayer.duration;
                progressFill.style.width = `${position * 100}%`;
            }
        });
    });

    // Touch events for mobile
    progressBar.addEventListener('touchstart', (e) => {
        e.preventDefault();
        isSeeking = true;
        wasPlaying = !audioPlayer.paused;
        if (wasPlaying) audioPlayer.pause();

        const touch = e.touches[0];
        const rect = progressBar.getBoundingClientRect();
        const position = Math.max(0, Math.min(1, (touch.clientX - rect.left) / rect.width));
        if (!isNaN(audioPlayer.duration)) {
            audioPlayer.currentTime = position * audioPlayer.duration;
            progressFill.style.width = `${position * 100}%`;
        }
    });

    document.addEventListener('mousemove', (e) => {
        if (isSeeking) {
            seek(progressBar, e, position => {
                if (!isNaN(audioPlayer.duration)) {
                    audioPlayer.currentTime = position * audioPlayer.duration;
                    progressFill.style.width = `${position * 100}%`;
                }
            });
        }

        if (isAdjustingVolume) {
            seek(volumeBar, e, position => {
                audioPlayer.volume = position;
                volumeFill.style.width = `${position * 100}%`;
                volumeBar.style.setProperty('--volume-level', `${position * 100}%`);
                localStorage.setItem('volume', position);
            });
        }
    });

    document.addEventListener('touchmove', (e) => {
        if (isSeeking) {
            const touch = e.touches[0];
            const rect = progressBar.getBoundingClientRect();
            const position = Math.max(0, Math.min(1, (touch.clientX - rect.left) / rect.width));
            if (!isNaN(audioPlayer.duration)) {
                audioPlayer.currentTime = position * audioPlayer.duration;
                progressFill.style.width = `${position * 100}%`;
            }
        }

        if (isAdjustingVolume) {
            const touch = e.touches[0];
            const rect = volumeBar.getBoundingClientRect();
            const position = Math.max(0, Math.min(1, (touch.clientX - rect.left) / rect.width));
            audioPlayer.volume = position;
            volumeFill.style.width = `${position * 100}%`;
            volumeBar.style.setProperty('--volume-level', `${position * 100}%`);
            localStorage.setItem('volume', position);
        }
    });

    document.addEventListener('mouseup', (e) => {
        if (isSeeking) {
            seek(progressBar, e, position => {
                if (!isNaN(audioPlayer.duration)) {
                    audioPlayer.currentTime = position * audioPlayer.duration;
                    player.updateMediaSessionPositionState();
                    if (wasPlaying) audioPlayer.play();
                }
            });
            isSeeking = false;
        }

        if (isAdjustingVolume) {
            isAdjustingVolume = false;
        }
    });

    document.addEventListener('touchend', (e) => {
        if (isSeeking) {
            if (!isNaN(audioPlayer.duration)) {
                player.updateMediaSessionPositionState();
                if (wasPlaying) audioPlayer.play();
            }
            isSeeking = false;
        }

        if (isAdjustingVolume) {
            isAdjustingVolume = false;
        }
    });

    progressBar.addEventListener('click', e => {
        if (!isSeeking) {
            seek(progressBar, e, position => {
                if (!isNaN(audioPlayer.duration)) {
                    audioPlayer.currentTime = position * audioPlayer.duration;
                    player.updateMediaSessionPositionState();
                }
            });
        }
    });

    volumeBar.addEventListener('mousedown', (e) => {
        isAdjustingVolume = true;
        seek(volumeBar, e, position => {
            audioPlayer.volume = position;
            volumeFill.style.width = `${position * 100}%`;
            volumeBar.style.setProperty('--volume-level', `${position * 100}%`);
            localStorage.setItem('volume', position);
        });
    });

    volumeBar.addEventListener('touchstart', (e) => {
        e.preventDefault();
        isAdjustingVolume = true;
        const touch = e.touches[0];
        const rect = volumeBar.getBoundingClientRect();
        const position = Math.max(0, Math.min(1, (touch.clientX - rect.left) / rect.width));
        audioPlayer.volume = position;
        volumeFill.style.width = `${position * 100}%`;
        volumeBar.style.setProperty('--volume-level', `${position * 100}%`);
        localStorage.setItem('volume', position);
    });
    volumeBar.addEventListener('click', e => {
        if (!isAdjustingVolume) {
            seek(volumeBar, e, position => {
                audioPlayer.volume = position;
                volumeFill.style.width = `${position * 100}%`;
                volumeBar.style.setProperty('--volume-level', `${position * 100}%`);
                localStorage.setItem('volume', position);
            });
        }
    });
}

export async function handleTrackAction(action, item, player, api, lyricsManager, type = 'track', ui = null) {
    if (!item) return;

    if (action === 'add-to-queue') {
        player.addToQueue(item);
        renderQueue(player);
        showNotification(`Added to queue: ${item.title}`);
    } else if (action === 'play-next') {
        player.addNextToQueue(item);
        renderQueue(player);
        showNotification(`Playing next: ${item.title}`);
    } else if (action === 'download') {
        await downloadTrackWithMetadata(item, player.quality, api, lyricsManager);
    } else if (action === 'toggle-like') {
        const added = await db.toggleFavorite(type, item);
        
        // Update all instances of this item's like button on the page
        const id = type === 'playlist' ? item.uuid : item.id;
        const selector = type === 'track' 
            ? `.track-item[data-track-id="${id}"] .like-btn` 
            : `.card[data-${type}-id="${id}"] .like-btn, .card[data-playlist-id="${id}"] .like-btn`;
        
        // Also check header buttons
        const headerBtn = document.getElementById(`like-${type}-btn`);
        
        const elementsToUpdate = [...document.querySelectorAll(selector)];
        if (headerBtn) elementsToUpdate.push(headerBtn);
        
        const nowPlayingLikeBtn = document.getElementById('now-playing-like-btn');
        if (nowPlayingLikeBtn && type === 'track' && player?.currentTrack?.id === item.id) {
            elementsToUpdate.push(nowPlayingLikeBtn);
        }

        elementsToUpdate.forEach(btn => {
             const heartIcon = btn.querySelector('svg');
             if (heartIcon) {
                 heartIcon.classList.toggle('filled', added);
                 if (heartIcon.hasAttribute('fill')) {
                    heartIcon.setAttribute('fill', added ? 'currentColor' : 'none');
                 }
             }
             btn.classList.toggle('active', added);
             btn.title = added ? 'Remove from Library' : 'Add to Library';
        });

        // Handle Library Page Update
        if (window.location.hash === '#library') {
            const itemSelector = type === 'track'
                ? `.track-item[data-track-id="${id}"]`
                : `.card[data-${type}-id="${id}"], .card[data-playlist-id="${id}"]`;
            
            const itemEl = document.querySelector(itemSelector);
            
            if (!added && itemEl) {
                // Remove item
                const container = itemEl.parentElement;
                itemEl.remove();
                if (container && container.children.length === 0) {
                    const msg = type === 'track' ? 'No liked songs yet.' : `No liked ${type}s yet.`;
                    container.innerHTML = `<div class="placeholder-text">${msg}</div>`;
                }
            } else if (added && !itemEl && ui && type === 'track') {
                // Add item (specifically for tracks currently)
                const tracksContainer = document.getElementById('library-tracks-container');
                if (tracksContainer) {
                    // Remove placeholder if it exists
                    const placeholder = tracksContainer.querySelector('.placeholder-text');
                    if (placeholder) placeholder.remove();

                    // Create track element
                    const index = tracksContainer.children.length;
                    const trackHTML = ui.createTrackItemHTML(item, index, true, false);
                    
                    const tempDiv = document.createElement('div');
                    tempDiv.innerHTML = trackHTML;
                    const newEl = tempDiv.firstElementChild;
                    
                    if (newEl) {
                        tracksContainer.appendChild(newEl);
                        trackDataStore.set(newEl, item);
                        ui.updateLikeState(newEl, 'track', item.id);
                    }
                }
            }
        }
    }
}

export function initializeTrackInteractions(player, api, mainContent, contextMenu, lyricsManager, ui) {
    let contextTrack = null;

    mainContent.addEventListener('click', async e => {
        const actionBtn = e.target.closest('.track-action-btn, .like-btn');
        if (actionBtn && actionBtn.dataset.action) {
            e.preventDefault(); // Prevent card navigation
            e.stopPropagation();
            const itemElement = actionBtn.closest('.track-item, .card');
            const action = actionBtn.dataset.action;
            const type = actionBtn.dataset.type || 'track';
            
            let item = itemElement ? trackDataStore.get(itemElement) : null;

            // If no item from element (e.g. header buttons), try to get from hash
            if (!item && action === 'toggle-like') {
                const id = window.location.hash.split('/')[1];
                if (id) {
                    try {
                        if (type === 'album') {
                            const data = await api.getAlbum(id);
                            item = data.album;
                        } else if (type === 'artist') {
                            item = await api.getArtist(id);
                        } else if (type === 'playlist') {
                            const data = await api.getPlaylist(id);
                            item = data.playlist;
                        }
                    } catch (err) { console.error(err); }
                }
            }

            if (item) {
                await handleTrackAction(action, item, player, api, lyricsManager, type, ui);
            }
            return;
        }

        const menuBtn = e.target.closest('.track-menu-btn');
        if (menuBtn) {
            e.stopPropagation();
            const trackItem = menuBtn.closest('.track-item');
            if (trackItem && !trackItem.dataset.queueIndex) {
                contextTrack = trackDataStore.get(trackItem);
                if (contextTrack) {
                    await updateContextMenuLikeState(contextMenu, contextTrack);
                    const rect = menuBtn.getBoundingClientRect();
                    positionMenu(contextMenu, rect.left, rect.bottom + 5, rect);
                }
            }
            return;
        }

        const trackItem = e.target.closest('.track-item');
        if (trackItem && !trackItem.dataset.queueIndex) {
            const parentList = trackItem.closest('.track-list');
            const allTrackElements = Array.from(parentList.querySelectorAll('.track-item'));
            const trackList = allTrackElements.map(el => trackDataStore.get(el)).filter(Boolean);

            if (trackList.length > 0) {
                const clickedTrackId = trackItem.dataset.trackId;
                const startIndex = trackList.findIndex(t => t.id == clickedTrackId);

                player.setQueue(trackList, startIndex);
                document.getElementById('shuffle-btn').classList.remove('active');
                player.playTrackFromQueue();
            }
        }

        const card = e.target.closest('.card');
        if (card) {
            const href = card.dataset.href;
            if (href) {
                // Allow native links inside card to work if any exist
                if (e.target.closest('a')) return;
                
                e.preventDefault();
                window.location.hash = href;
            }
        }
    });

    mainContent.addEventListener('contextmenu', async e => {
        const trackItem = e.target.closest('.track-item');
        if (trackItem && !trackItem.dataset.queueIndex) {
            e.preventDefault();
            contextTrack = trackDataStore.get(trackItem);

            if (contextTrack) {
                await updateContextMenuLikeState(contextMenu, contextTrack);
                positionMenu(contextMenu, e.pageX, e.pageY);
            }
        }
    });

    document.addEventListener('click', () => {
        contextMenu.style.display = 'none';
    });

    contextMenu.addEventListener('click', async e => {
        e.stopPropagation();
        const action = e.target.dataset.action;
        if (action && contextTrack) {
            await handleTrackAction(action, contextTrack, player, api, lyricsManager, 'track', ui);
        }
        contextMenu.style.display = 'none';
    });

    // Now playing bar interactions
    document.querySelector('.now-playing-bar .title').addEventListener('click', () => {
        const track = player.currentTrack;
        if (track?.album?.id) {
            window.location.hash = `#album/${track.album.id}`;
        }
    });

    document.querySelector('.now-playing-bar .artist').addEventListener('click', () => {
        const track = player.currentTrack;
        if (track?.artist?.id) {
            window.location.hash = `#artist/${track.artist.id}`;
        }
    });

    const nowPlayingLikeBtn = document.getElementById('now-playing-like-btn');
    if (nowPlayingLikeBtn) {
        nowPlayingLikeBtn.addEventListener('click', async (e) => {
            e.stopPropagation();
            if (player.currentTrack) {
                await handleTrackAction('toggle-like', player.currentTrack, player, api, lyricsManager, 'track', ui);
            }
        });
    }
}

function renderQueue(player) {
    // This will be called from queue module
    if (window.renderQueueFunction) {
        window.renderQueueFunction();
    }
}

function formatTime(seconds) {
    if (isNaN(seconds)) return '0:00';
    const m = Math.floor(seconds / 60);
    const s = Math.floor(seconds % 60);
    return `${m}:${String(s).padStart(2, '0')}`;
}

async function updateContextMenuLikeState(menu, track) {
    const likeItem = menu.querySelector('[data-action="toggle-like"]');
    if (likeItem) {
        const isLiked = await db.isFavorite('track', track.id);
        likeItem.textContent = isLiked ? 'Remove from Library' : 'Add to Library';
    }
}

function positionMenu(menu, x, y, anchorRect = null) {
    // Temporarily show to measure dimensions
    menu.style.visibility = 'hidden';
    menu.style.display = 'block';
    
    const menuWidth = menu.offsetWidth;
    const menuHeight = menu.offsetHeight;
    const windowWidth = window.innerWidth;
    const windowHeight = window.innerHeight;
    
    let left = x;
    let top = y;

    if (anchorRect) {
        // Adjust horizontal position if it overflows right
        if (left + menuWidth > windowWidth - 10) { // 10px buffer
            left = anchorRect.right - menuWidth;
            if (left < 10) left = 10;
        }
        // Adjust vertical position if it overflows bottom
        if (top + menuHeight > windowHeight - 10) {
            top = anchorRect.top - menuHeight - 5;
        }
    } else {
        // Adjust horizontal position if it overflows right
        if (left + menuWidth > windowWidth - 10) {
            left = windowWidth - menuWidth - 10;
        }
        // Adjust vertical position if it overflows bottom
        if (top + menuHeight > windowHeight - 10) {
            top = y - menuHeight;
        }
    }

    menu.style.top = `${top}px`;
    menu.style.left = `${left}px`;
    menu.style.visibility = 'visible';
}