package com.vitorpamplona.amethyst.ui.components

import android.graphics.drawable.Drawable
import android.util.Log
import android.view.View
import android.view.ViewGroup
import android.widget.FrameLayout
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.defaultMinSize
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.material.IconButton
import androidx.compose.material.MaterialTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.MutableState
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.boundsInWindow
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.LocalLifecycleOwner
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.isFinite
import androidx.compose.ui.viewinterop.AndroidView
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleEventObserver
import androidx.media3.common.C
import androidx.media3.common.MediaItem
import androidx.media3.common.Player
import androidx.media3.datasource.DataSource
import androidx.media3.datasource.okhttp.OkHttpDataSource
import androidx.media3.exoplayer.ExoPlayer
import androidx.media3.exoplayer.hls.HlsMediaSource
import androidx.media3.exoplayer.source.ProgressiveMediaSource
import androidx.media3.ui.AspectRatioFrameLayout
import androidx.media3.ui.PlayerView
import coil.imageLoader
import coil.request.ImageRequest
import com.vitorpamplona.amethyst.VideoCache
import com.vitorpamplona.amethyst.service.HttpClient
import com.vitorpamplona.amethyst.service.connectivitystatus.ConnectivityStatus
import com.vitorpamplona.amethyst.ui.note.MuteIcon
import com.vitorpamplona.amethyst.ui.note.MutedIcon
import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
import com.vitorpamplona.amethyst.ui.theme.Size50Modifier
import com.vitorpamplona.amethyst.ui.theme.VolumeBottomIconSize
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlin.time.ExperimentalTime
import kotlin.time.measureTimedValue

public var DefaultMutedSetting = mutableStateOf(true)

@Composable
fun LoadThumbAndThenVideoView(
    videoUri: String,
    description: String? = null,
    thumbUri: String,
    accountViewModel: AccountViewModel,
    onDialog: ((Boolean) -> Unit)? = null
) {
    var loadingFinished by remember { mutableStateOf<Pair<Boolean, Drawable?>>(Pair(false, null)) }

    val context = LocalContext.current

    LaunchedEffect(Unit) {
        launch(Dispatchers.IO) {
            try {
                val request = ImageRequest.Builder(context).data(thumbUri).build()
                val myCover = context.imageLoader.execute(request).drawable
                if (myCover != null) {
                    loadingFinished = Pair(true, myCover)
                } else {
                    loadingFinished = Pair(true, null)
                }
            } catch (e: Exception) {
                Log.e("VideoView", "Fail to load cover $thumbUri", e)
                loadingFinished = Pair(true, null)
            }
        }
    }

    if (loadingFinished.first) {
        if (loadingFinished.second != null) {
            VideoView(videoUri, description, VideoThumb(loadingFinished.second), accountViewModel, onDialog = onDialog)
        } else {
            VideoView(videoUri, description, null, accountViewModel, onDialog = onDialog)
        }
    }
}

@OptIn(ExperimentalTime::class)
@Composable
fun VideoView(
    videoUri: String,
    description: String? = null,
    thumb: VideoThumb? = null,
    accountViewModel: AccountViewModel,
    alwaysShowVideo: Boolean = false,
    onDialog: ((Boolean) -> Unit)? = null
) {
    val (value, elapsed) = measureTimedValue {
        VideoView1(videoUri, description, thumb, onDialog, accountViewModel, alwaysShowVideo)
    }
    Log.d("Rendering Metrics", "VideoView $elapsed $videoUri")
}

@Composable
fun VideoView1(
    videoUri: String,
    description: String? = null,
    thumb: VideoThumb? = null,
    onDialog: ((Boolean) -> Unit)? = null,
    accountViewModel: AccountViewModel,
    alwaysShowVideo: Boolean = false
) {
    var exoPlayerData by remember { mutableStateOf<VideoPlayer?>(null) }
    val defaultToStart by remember { mutableStateOf(DefaultMutedSetting.value) }
    val context = LocalContext.current

    LaunchedEffect(key1 = videoUri) {
        if (exoPlayerData == null) {
            launch(Dispatchers.Default) {
                exoPlayerData = VideoPlayer(ExoPlayer.Builder(context).build())
            }
        }
    }

    exoPlayerData?.let {
        VideoView(videoUri, description, it, defaultToStart, thumb, onDialog, accountViewModel, alwaysShowVideo)
    }

    DisposableEffect(Unit) {
        onDispose {
            exoPlayerData?.exoPlayer?.release()
        }
    }
}

@OptIn(ExperimentalTime::class)
@Composable
fun VideoView(
    videoUri: String,
    description: String? = null,
    exoPlayerData: VideoPlayer,
    defaultToStart: Boolean = false,
    thumb: VideoThumb? = null,
    onDialog: ((Boolean) -> Unit)? = null,
    accountViewModel: AccountViewModel,
    alwaysShowVideo: Boolean = false
) {
    val (_, elapsed) = measureTimedValue {
        VideoView1(videoUri, description, exoPlayerData, defaultToStart, thumb, onDialog, accountViewModel, alwaysShowVideo)
    }
    Log.d("Rendering Metrics", "VideoView $elapsed $videoUri")
}

@Composable
@androidx.annotation.OptIn(androidx.media3.common.util.UnstableApi::class)
fun VideoView1(
    videoUri: String,
    description: String? = null,
    exoPlayerData: VideoPlayer,
    defaultToStart: Boolean = false,
    thumb: VideoThumb? = null,
    onDialog: ((Boolean) -> Unit)? = null,
    accountViewModel: AccountViewModel,
    alwaysShowVideo: Boolean = false
) {
    val lifecycleOwner = rememberUpdatedState(LocalLifecycleOwner.current)

    val media = remember { MediaItem.Builder().setUri(videoUri).build() }

    val settings = accountViewModel.account.settings
    val isMobile = ConnectivityStatus.isOnMobileData.value

    val automaticallyStartPlayback = remember {
        mutableStateOf(
            if (alwaysShowVideo) { true } else {
                when (settings.automaticallyStartPlayback) {
                    true -> !isMobile
                    false -> false
                    else -> true
                }
            }
        )
    }

    exoPlayerData.exoPlayer.apply {
        repeatMode = Player.REPEAT_MODE_ALL
        videoScalingMode = C.VIDEO_SCALING_MODE_SCALE_TO_FIT
        volume = if (defaultToStart) 0f else 1f
        if (videoUri.startsWith("file")) {
            setMediaItem(media)
        } else if (videoUri.endsWith("m3u8")) {
            // Should not use cache.
            val dataSourceFactory: DataSource.Factory = OkHttpDataSource.Factory(HttpClient.getHttpClient())
            setMediaSource(
                HlsMediaSource.Factory(dataSourceFactory).createMediaSource(
                    media
                )
            )
        } else {
            setMediaSource(
                ProgressiveMediaSource.Factory(VideoCache.get()).createMediaSource(
                    media
                )
            )
        }
        prepare()
    }

    if (!automaticallyStartPlayback.value) {
        ImageUrlWithDownloadButton(url = videoUri, showImage = automaticallyStartPlayback)
    } else {
        RenderVideoPlayer(exoPlayerData, thumb, automaticallyStartPlayback, onDialog)
    }

    DisposableEffect(Unit) {
        val observer = LifecycleEventObserver { _, event ->
            when (event) {
                Lifecycle.Event.ON_PAUSE -> {
                    exoPlayerData.exoPlayer.pause()
                }
                else -> {}
            }
        }
        val lifecycle = lifecycleOwner.value.lifecycle

        lifecycle.addObserver(observer)
        onDispose {
            lifecycle.removeObserver(observer)
        }
    }
}

@Stable
data class VideoPlayer(
    val exoPlayer: ExoPlayer
)

@Stable
data class VideoThumb(
    val thumb: Drawable?
)

@Composable
@androidx.annotation.OptIn(androidx.media3.common.util.UnstableApi::class)
private fun RenderVideoPlayer(
    playerData: VideoPlayer,
    thumbData: VideoThumb?,
    automaticallyStartPlayback: MutableState<Boolean>,
    onDialog: ((Boolean) -> Unit)?
) {
    val context = LocalContext.current

    BoxWithConstraints() {
        AndroidView(
            modifier = Modifier
                .fillMaxWidth()
                .defaultMinSize(minHeight = 70.dp)
                .align(Alignment.Center)
                .onVisibilityChanges { visible ->
                    if (!automaticallyStartPlayback.value) {
                        playerData.exoPlayer.stop()
                    }
                    if (!automaticallyStartPlayback.value && visible && !playerData.exoPlayer.isPlaying) {
                        playerData.exoPlayer.pause()
                    } else if (visible && !playerData.exoPlayer.isPlaying) {
                        playerData.exoPlayer.play()
                    } else if (!visible && playerData.exoPlayer.isPlaying) {
                        playerData.exoPlayer.pause()
                    }
                },
            factory = {
                PlayerView(context).apply {
                    player = playerData.exoPlayer
                    layoutParams = FrameLayout.LayoutParams(
                        ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT
                    )
                    controllerAutoShow = false
                    thumbData?.thumb?.let { defaultArtwork = it }
                    hideController()
                    resizeMode =
                        if (maxHeight.isFinite) AspectRatioFrameLayout.RESIZE_MODE_FIT else AspectRatioFrameLayout.RESIZE_MODE_FIXED_WIDTH
                    onDialog?.let { innerOnDialog ->
                        setFullscreenButtonClickListener {
                            playerData.exoPlayer.pause()
                            innerOnDialog(it)
                        }
                    }
                }
            }
        )

        MuteButton() { mute: Boolean ->
            DefaultMutedSetting.value = mute

            playerData.exoPlayer.volume = if (mute) 0f else 1f
        }
    }
}

fun Modifier.onVisibilityChanges(onVisibilityChanges: (Boolean) -> Unit): Modifier = composed {
    val view = LocalView.current
    var isVisible: Boolean? by remember { mutableStateOf(null) }

    onGloballyPositioned { coordinates ->
        val newIsVisible = coordinates.isCompletelyVisible(view)
        if (isVisible != newIsVisible) {
            isVisible = newIsVisible
            onVisibilityChanges(isVisible == true)
        }
    }
}

fun LayoutCoordinates.isCompletelyVisible(view: View): Boolean {
    if (!isAttached) return false
    // Window relative bounds of our compose root view that are visible on the screen
    val globalRootRect = android.graphics.Rect()
    if (!view.getGlobalVisibleRect(globalRootRect)) {
        // we aren't visible at all.
        return false
    }
    val bounds = boundsInWindow()
    // Make sure we are completely in bounds.
    return bounds.top >= globalRootRect.top &&
        bounds.left >= globalRootRect.left &&
        bounds.right <= globalRootRect.right &&
        bounds.bottom <= globalRootRect.bottom
}

@Composable
private fun MuteButton(toggle: (Boolean) -> Unit) {
    Box(modifier = VolumeBottomIconSize) {
        Box(
            Modifier
                .clip(CircleShape)
                .fillMaxSize(0.6f)
                .align(Alignment.Center)
                .background(MaterialTheme.colors.background)
        )

        val mutedInstance = remember { mutableStateOf(DefaultMutedSetting.value) }

        IconButton(
            onClick = {
                mutedInstance.value = !mutedInstance.value
                toggle(mutedInstance.value)
            },
            modifier = Size50Modifier
        ) {
            if (mutedInstance.value) {
                MutedIcon()
            } else {
                MuteIcon()
            }
        }
    }
}