-- music.lua - Music player functionality
-- Handles playback, playlists, library, and now playing

local music_doc = nil

-- Player state
local player_state = {
    is_playing = false,
    is_shuffled = false,
    repeat_mode = "off",  -- off, all, one
    current_time = 0,
    duration = 234,  -- 3:54
    volume = 80
}

-- Current track
local current_track = {
    id = "1",
    title = "Midnight City",
    artist = "M83",
    album = "Hurry Up, We're Dreaming",
    duration = 234,
    art_color = "#667eea"
}

-- Playlists
local playlists = {
    {id = "liked", name = "Liked Songs", count = 127, color = "#dc2626"},
    {id = "daily1", name = "Daily Mix 1", count = 50, color = "#667eea"},
    {id = "release", name = "Release Radar", count = 30, color = "#16a34a"},
    {id = "chill", name = "Chill Vibes", count = 45, color = "#f093fb"},
    {id = "workout", name = "Workout Mix", count = 35, color = "#2563eb"},
    {id = "focus", name = "Focus Flow", count = 40, color = "#4facfe"}
}

-- Recently played
local recently_played = {
    {id = "pop", name = "Pop Hits", type = "Playlist", color = "#43e97b"},
    {id = "electronic", name = "Electronic", type = "Playlist", color = "#fa709a"},
    {id = "jazz", name = "Jazz Classics", type = "Playlist", color = "#667eea"},
    {id = "rock", name = "Rock Legends", type = "Playlist", color = "#f093fb"}
}

-- Song queue
local queue = {
    {id = "1", title = "Midnight City", artist = "M83", duration = 234},
    {id = "2", title = "Intro", artist = "The xx", duration = 128},
    {id = "3", title = "Retrograde", artist = "James Blake", duration = 233},
    {id = "4", title = "Tame Impala", artist = "The Less I Know The Better", duration = 218},
    {id = "5", title = "Redbone", artist = "Childish Gambino", duration = 327}
}

local current_queue_index = 1
local timer_id = nil

-- Initialize music app
function initMusic(doc)
    print("[Music] Initializing...")
    music_doc = doc
    updateNowPlaying()
    updateMiniPlayer()
    renderPlaylists()
    renderRecentlyPlayed()
end

-- Format time (seconds to mm:ss)
local function formatTime(seconds)
    local mins = math.floor(seconds / 60)
    local secs = seconds % 60
    return string.format("%d:%02d", mins, secs)
end

-- Update now playing display
function updateNowPlaying()
    if not music_doc then return end

    local title = music_doc:GetElementById("now-playing-title")
    local artist = music_doc:GetElementById("now-playing-artist")

    if title then
        title.inner_rml = current_track.title
    end
    if artist then
        artist.inner_rml = current_track.artist
    end
end

-- Update mini player
function updateMiniPlayer()
    if not music_doc then return end

    local title = music_doc:GetElementById("mini-player-title")
    local artist = music_doc:GetElementById("mini-player-artist")
    local art = music_doc:GetElementById("mini-player-art")
    local play_btn = music_doc:GetElementById("mini-play-btn")

    if title then
        title.inner_rml = current_track.title
    end
    if artist then
        artist.inner_rml = current_track.artist
    end
    if art then
        art.style["background-color"] = current_track.art_color
        art.inner_rml = current_track.title:sub(1,1):upper()
    end
    if play_btn then
        local icon = player_state.is_playing and "pause.tga" or "play.tga"
        play_btn.inner_rml = [[<img src="../../icons/]] .. icon .. [[" style="width: 28px; height: 28px;"/>]]
    end
end

-- Toggle play/pause
function togglePlay()
    player_state.is_playing = not player_state.is_playing
    print("[Music] " .. (player_state.is_playing and "Playing" or "Paused"))

    if player_state.is_playing then
        startPlaybackTimer()
    else
        stopPlaybackTimer()
    end

    updateMiniPlayer()
    updatePlayButton()
end

-- Start playback timer
function startPlaybackTimer()
    if setInterval then
        timer_id = setInterval(function()
            if player_state.is_playing then
                player_state.current_time = player_state.current_time + 1
                if player_state.current_time >= current_track.duration then
                    nextTrack()
                end
                updateProgress()
            end
        end, 1000)
    end
end

-- Stop playback timer
function stopPlaybackTimer()
    if timer_id and clearInterval then
        clearInterval(timer_id)
        timer_id = nil
    end
end

-- Update play button
function updatePlayButton()
    if not music_doc then return end

    local btn = music_doc:GetElementById("play-btn")
    if btn then
        local icon = player_state.is_playing and "pause.tga" or "play.tga"
        btn.inner_rml = [[<img src="../../icons/]] .. icon .. [[" style="width: 48px; height: 48px;"/>]]
    end
end

-- Update progress display
function updateProgress()
    if not music_doc then return end

    local current = music_doc:GetElementById("current-time")
    local total = music_doc:GetElementById("total-time")
    local progress = music_doc:GetElementById("progress-bar")

    if current then
        current.inner_rml = formatTime(player_state.current_time)
    end
    if total then
        total.inner_rml = formatTime(current_track.duration)
    end
    if progress then
        local percent = (player_state.current_time / current_track.duration) * 100
        progress.style.width = percent .. "%"
    end
end

-- Next track
function nextTrack()
    print("[Music] Next track")

    if player_state.is_shuffled then
        current_queue_index = math.random(1, #queue)
    else
        current_queue_index = current_queue_index + 1
        if current_queue_index > #queue then
            if player_state.repeat_mode == "all" then
                current_queue_index = 1
            else
                current_queue_index = #queue
                player_state.is_playing = false
                stopPlaybackTimer()
            end
        end
    end

    loadTrack(queue[current_queue_index])
end

-- Previous track
function previousTrack()
    print("[Music] Previous track")

    if player_state.current_time > 3 then
        -- Restart current track
        player_state.current_time = 0
    else
        current_queue_index = current_queue_index - 1
        if current_queue_index < 1 then
            current_queue_index = 1
        end
        loadTrack(queue[current_queue_index])
    end

    updateProgress()
end

-- Load a track
function loadTrack(track)
    current_track.id = track.id
    current_track.title = track.title
    current_track.artist = track.artist
    current_track.duration = track.duration
    player_state.current_time = 0

    updateNowPlaying()
    updateMiniPlayer()
    updateProgress()

    print("[Music] Now playing: " .. track.title .. " - " .. track.artist)

    if showToast then
        showToast("Now playing: " .. track.title)
    end
end

-- Toggle shuffle
function toggleShuffle()
    player_state.is_shuffled = not player_state.is_shuffled
    print("[Music] Shuffle: " .. tostring(player_state.is_shuffled))

    local btn = music_doc:GetElementById("shuffle-btn")
    if btn then
        if player_state.is_shuffled then
            btn:SetClass("active", true)
        else
            btn:SetClass("active", false)
        end
    end

    if showToast then
        showToast(player_state.is_shuffled and "Shuffle on" or "Shuffle off")
    end
end

-- Toggle repeat
function toggleRepeat()
    if player_state.repeat_mode == "off" then
        player_state.repeat_mode = "all"
    elseif player_state.repeat_mode == "all" then
        player_state.repeat_mode = "one"
    else
        player_state.repeat_mode = "off"
    end

    print("[Music] Repeat: " .. player_state.repeat_mode)

    local btn = music_doc:GetElementById("repeat-btn")
    if btn then
        if player_state.repeat_mode ~= "off" then
            btn:SetClass("active", true)
        else
            btn:SetClass("active", false)
        end
    end

    if showToast then
        local msg = "Repeat: " .. player_state.repeat_mode
        showToast(msg)
    end
end

-- Toggle like
function toggleLike()
    print("[Music] Toggle like")
    if showToast then
        showToast("Added to Liked Songs")
    end
end

-- Render playlists
function renderPlaylists()
    if not music_doc then return end

    local container = music_doc:GetElementById("quick-access")
    if not container then return end

    local html = ""
    for i, pl in ipairs(playlists) do
        if i <= 6 then
            local initial = pl.name:sub(1,1):upper()
            html = html .. [[
                <div class="quick-card" onclick="openPlaylist(']] .. pl.id .. [[')">
                    <div class="quick-card-art" style="background-color: ]] .. pl.color .. [[;">]] .. initial .. [[</div>
                    <span class="quick-card-title">]] .. pl.name .. [[</span>
                </div>
            ]]
        end
    end

    container.inner_rml = html
end

-- Render recently played
function renderRecentlyPlayed()
    if not music_doc then return end

    local container = music_doc:GetElementById("recent-row")
    if not container then return end

    local html = ""
    for _, item in ipairs(recently_played) do
        local initial = item.name:sub(1,1):upper()
        html = html .. [[
            <div class="recent-item" onclick="openPlaylist(']] .. item.id .. [[')">
                <div class="recent-art" style="background-color: ]] .. item.color .. [[;">]] .. initial .. [[</div>
                <div class="recent-title">]] .. item.name .. [[</div>
                <div class="recent-subtitle">]] .. item.type .. [[</div>
            </div>
        ]]
    end

    container.inner_rml = html
end

-- Open playlist
function openPlaylist(playlist_id)
    print("[Music] Opening playlist: " .. playlist_id)
    if navigateTo then
        navigateTo("playlist_" .. playlist_id)
    else
        if showToast then
            showToast("Playlist: " .. playlist_id)
        end
    end
end

-- Open now playing
function openNowPlaying()
    print("[Music] Opening now playing...")
    if navigateTo then
        navigateTo("now_playing")
    end
end

-- Open search
function openSearch()
    print("[Music] Opening search...")
    if navigateTo then
        navigateTo("music_search")
    else
        if showToast then
            showToast("Search music")
        end
    end
end

-- Open library
function openLibrary()
    print("[Music] Opening library...")
    if navigateTo then
        navigateTo("music_library")
    else
        if showToast then
            showToast("Your library")
        end
    end
end

-- Seek to position (0-1)
function seekTo(position)
    player_state.current_time = math.floor(position * current_track.duration)
    updateProgress()
end