package com.example.ui.components

import android.net.Uri
import androidx.annotation.OptIn
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.aspectRatio
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.navigationBarsPadding
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.statusBarsPadding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Favorite
import androidx.compose.material.icons.filled.FavoriteBorder
import androidx.compose.material.icons.filled.KeyboardArrowDown
import androidx.compose.material.icons.filled.MusicNote
import androidx.compose.material.icons.filled.Pause
import androidx.compose.material.icons.filled.PlayArrow
import androidx.compose.material.icons.filled.QueueMusic
import androidx.compose.material.icons.filled.Repeat
import androidx.compose.material.icons.filled.RepeatOne
import androidx.compose.material.icons.filled.Shuffle
import androidx.compose.material.icons.filled.SkipNext
import androidx.compose.material.icons.filled.SkipPrevious
import androidx.compose.material.icons.filled.Speed
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Slider
import androidx.compose.material3.SliderDefaults
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.media3.common.util.UnstableApi
import coil.compose.AsyncImage
import com.example.data.model.MediaItemData
import com.example.data.model.RepeatMode
import com.example.playback.PlaybackManager
import com.example.ui.theme.AccentViolet
import com.example.ui.theme.AccentVioletDim
import com.example.ui.theme.AmoledBlack
import com.example.ui.theme.SurfaceElevated
import com.example.ui.theme.TextPrimary
import com.example.ui.theme.TextSecondary
import com.example.ui.theme.TextTertiary

@OptIn(UnstableApi::class)
@Composable
fun FullAudioPlayerSheet(
  mediaItem: MediaItemData,
  isFavorite: Boolean,
  onToggleFavorite: () -> Unit,
  onDismiss: () -> Unit,
  onQueueClick: () -> Unit,
  modifier: Modifier = Modifier
) {
  val isPlaying by PlaybackManager.isPlaying.collectAsState()
  val positionMs by PlaybackManager.currentPositionMs.collectAsState()
  val durationMs by PlaybackManager.durationMs.collectAsState()
  val repeatMode by PlaybackManager.repeatMode.collectAsState()
  val isShuffle by PlaybackManager.isShuffleEnabled.collectAsState()
  val speed by PlaybackManager.playbackSpeed.collectAsState()
  val controlsVisible by PlaybackManager.isAudioControlsVisible.collectAsState()

  var isDraggingSlider by remember { mutableStateOf(false) }
  var dragPosition by remember { mutableStateOf(0f) }

  Box(
    modifier = modifier
      .fillMaxSize()
      .background(AmoledBlack)
      .testTag("full_audio_player")
  ) {
    // Subtle, lightweight background ambient gradient
    Box(
      modifier = Modifier
        .fillMaxSize()
        .background(
          Brush.radialGradient(
            colors = listOf(
              AccentVioletDim.copy(alpha = 0.35f),
              AmoledBlack
            ),
            radius = 1200f
          )
        )
    )

    Column(
      modifier = Modifier
        .fillMaxSize()
        .statusBarsPadding()
        .navigationBarsPadding()
        .padding(horizontal = 24.dp),
      horizontalAlignment = Alignment.CenterHorizontally
    ) {
      // Top Bar: Dismiss arrow, SwipePlay title, and Queue shortcut
      Row(
        modifier = Modifier
          .fillMaxWidth()
          .padding(top = 8.dp, bottom = 16.dp),
        horizontalArrangement = Arrangement.SpaceBetween,
        verticalAlignment = Alignment.CenterVertically
      ) {
        IconButton(
          onClick = onDismiss,
          modifier = Modifier.testTag("audio_player_dismiss")
        ) {
          Icon(
            imageVector = Icons.Default.KeyboardArrowDown,
            contentDescription = "Collapse",
            tint = TextPrimary,
            modifier = Modifier.size(32.dp)
          )
        }

        Text(
          text = "NOW PLAYING",
          color = TextSecondary,
          fontSize = 12.sp,
          fontWeight = FontWeight.Bold,
          letterSpacing = 2.sp
        )

        IconButton(
          onClick = onQueueClick,
          modifier = Modifier.testTag("audio_player_queue_btn")
        ) {
          Icon(
            imageVector = Icons.Default.QueueMusic,
            contentDescription = "Playback Queue",
            tint = TextPrimary
          )
        }
      }

      Spacer(modifier = Modifier.weight(0.5f))

      // Large Album Artwork or Fallback with tap to show/hide controls
      Box(
        modifier = Modifier
          .fillMaxWidth()
          .aspectRatio(1f)
          .clip(RoundedCornerShape(20.dp))
          .background(SurfaceElevated)
          .clickable(
            interactionSource = remember { MutableInteractionSource() },
            indication = null
          ) {
            PlaybackManager.toggleAudioControlsVisibility()
          }
          .testTag("audio_artwork_container"),
        contentAlignment = Alignment.Center
      ) {
        if (!mediaItem.albumArtUri.isNullOrBlank()) {
          AsyncImage(
            model = Uri.parse(mediaItem.albumArtUri),
            contentDescription = "Album Artwork",
            contentScale = ContentScale.Crop,
            modifier = Modifier.fillMaxSize()
          )
        } else {
          Column(horizontalAlignment = Alignment.CenterHorizontally) {
            Icon(
              imageVector = Icons.Default.MusicNote,
              contentDescription = "Music",
              tint = AccentViolet,
              modifier = Modifier.size(96.dp)
            )
            Spacer(modifier = Modifier.height(12.dp))
            Text(
              text = "Tap to reveal controls",
              color = TextTertiary,
              fontSize = 12.sp
            )
          }
        }
      }

      Spacer(modifier = Modifier.height(28.dp))

      // Song Title and Artist with Favorite Button
      Row(
        modifier = Modifier.fillMaxWidth(),
        verticalAlignment = Alignment.CenterVertically,
        horizontalArrangement = Arrangement.SpaceBetween
      ) {
        Column(modifier = Modifier.weight(1f)) {
          Text(
            text = mediaItem.title,
            color = TextPrimary,
            style = MaterialTheme.typography.headlineSmall,
            fontWeight = FontWeight.Bold,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis
          )
          Spacer(modifier = Modifier.height(4.dp))
          Text(
            text = "${mediaItem.artist} • ${mediaItem.album}",
            color = TextSecondary,
            style = MaterialTheme.typography.bodyMedium,
            maxLines = 1,
            overflow = TextOverflow.Ellipsis
          )
        }

        IconButton(
          onClick = onToggleFavorite,
          modifier = Modifier.testTag("audio_player_fav_btn")
        ) {
          Icon(
            imageVector = if (isFavorite) Icons.Default.Favorite else Icons.Default.FavoriteBorder,
            contentDescription = "Favorite",
            tint = if (isFavorite) AccentViolet else TextSecondary
          )
        }
      }

      Spacer(modifier = Modifier.weight(0.5f))

      // Always visible complete playback controls
      Column(modifier = Modifier.fillMaxWidth()) {
        // Seek bar & Timestamps
        val activePos = if (isDraggingSlider) dragPosition.toLong() else positionMs
        val totalDur = durationMs.coerceAtLeast(1L)

        Slider(
          value = activePos.coerceIn(0L, totalDur).toFloat(),
          onValueChange = {
            isDraggingSlider = true
            dragPosition = it
          },
          onValueChangeFinished = {
            PlaybackManager.seekTo(dragPosition.toLong())
            isDraggingSlider = false
          },
          valueRange = 0f..totalDur.toFloat(),
          colors = SliderDefaults.colors(
            thumbColor = AccentViolet,
            activeTrackColor = AccentViolet,
            inactiveTrackColor = Color.White.copy(alpha = 0.2f)
          ),
          modifier = Modifier
            .fillMaxWidth()
            .testTag("audio_seek_slider")
        )

        Row(
          modifier = Modifier.fillMaxWidth(),
          horizontalArrangement = Arrangement.SpaceBetween
        ) {
          Text(
            text = formatTime(activePos),
            color = TextSecondary,
            fontSize = 12.sp
          )
          Text(
            text = formatTime(totalDur),
            color = TextSecondary,
            fontSize = 12.sp
          )
        }

        Spacer(modifier = Modifier.height(16.dp))

        // Control Actions: Shuffle, Prev, Play/Pause, Next, Repeat
        Row(
          modifier = Modifier.fillMaxWidth(),
          horizontalArrangement = Arrangement.SpaceEvenly,
          verticalAlignment = Alignment.CenterVertically
        ) {
          IconButton(
            onClick = { PlaybackManager.toggleShuffle() },
            modifier = Modifier.testTag("audio_shuffle_btn")
          ) {
            Icon(
              imageVector = Icons.Default.Shuffle,
              contentDescription = "Shuffle",
              tint = if (isShuffle) AccentViolet else TextSecondary
            )
          }

          IconButton(
            onClick = { PlaybackManager.playPrevious() },
            modifier = Modifier.testTag("audio_prev_btn")
          ) {
            Icon(
              imageVector = Icons.Default.SkipPrevious,
              contentDescription = "Previous",
              tint = TextPrimary,
              modifier = Modifier.size(32.dp)
            )
          }

          IconButton(
            onClick = { PlaybackManager.togglePlayPause() },
            modifier = Modifier
              .size(72.dp)
              .clip(CircleShape)
              .background(AccentViolet)
              .testTag("audio_play_pause_btn")
          ) {
            Icon(
              imageVector = if (isPlaying) Icons.Default.Pause else Icons.Default.PlayArrow,
              contentDescription = if (isPlaying) "Pause" else "Play",
              tint = AmoledBlack,
              modifier = Modifier.size(42.dp)
            )
          }

          IconButton(
            onClick = { PlaybackManager.playNext() },
            modifier = Modifier.testTag("audio_next_btn")
          ) {
            Icon(
              imageVector = Icons.Default.SkipNext,
              contentDescription = "Next",
              tint = TextPrimary,
              modifier = Modifier.size(32.dp)
            )
          }

          IconButton(
            onClick = {
              val nextMode = when (repeatMode) {
                RepeatMode.OFF -> RepeatMode.ALL
                RepeatMode.ALL -> RepeatMode.ONE
                RepeatMode.ONE -> RepeatMode.OFF
              }
              PlaybackManager.setRepeatMode(nextMode)
            },
            modifier = Modifier.testTag("audio_repeat_btn")
          ) {
            Icon(
              imageVector = if (repeatMode == RepeatMode.ONE) Icons.Default.RepeatOne else Icons.Default.Repeat,
              contentDescription = "Repeat",
              tint = if (repeatMode != RepeatMode.OFF) AccentViolet else TextSecondary
            )
          }
        }

        Spacer(modifier = Modifier.height(14.dp))

        // Speed Pill centered
        Row(
          modifier = Modifier.fillMaxWidth(),
          horizontalArrangement = Arrangement.Center
        ) {
          Surface(
            onClick = {
              val nextSpeed = when (speed) {
                1.0f -> 1.25f
                1.25f -> 1.5f
                1.5f -> 2.0f
                2.0f -> 0.75f
                else -> 1.0f
              }
              PlaybackManager.setPlaybackSpeed(nextSpeed)
            },
            shape = RoundedCornerShape(8.dp),
            color = SurfaceElevated,
            modifier = Modifier.testTag("audio_speed_btn")
          ) {
            Row(
              verticalAlignment = Alignment.CenterVertically,
              modifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp)
            ) {
              Icon(
                imageVector = Icons.Default.Speed,
                contentDescription = "Speed",
                tint = TextSecondary,
                modifier = Modifier.size(14.dp)
              )
              Spacer(modifier = Modifier.width(6.dp))
              Text(
                text = "Speed: ${speed}x",
                color = TextPrimary,
                fontSize = 12.sp,
                fontWeight = FontWeight.Bold
              )
            }
          }
        }
      }

      Spacer(modifier = Modifier.height(24.dp))
    }
  }
}