package com.suno.android.ui.screens.songdetails

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
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.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.HorizontalDivider
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
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.painter.ColorPainter
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.platform.LocalFocusManager
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import coil3.compose.AsyncImage
import com.suno.android.common_core_utils.Id
import com.suno.android.common_data.mappers.clips.SongListData
import com.suno.android.common_ui.components.buttons.SunoMediumButton
import com.suno.android.common_ui.components.images.ProfileAvatarImage
import com.suno.android.common_ui.theme.ExtendedTheme
import com.suno.android.common_res.R as CommonResR
import com.suno.android.common_ui.R as CommonUiR

@Composable
fun SongDetailsMainScreen(
    viewModel: SongDetailsViewModel,
    isInPostingMode: Boolean,
    onSongArtClicked: () -> Unit,
    songId: Id<SongListData>,
) {
    val focusManager = LocalFocusManager.current
    val state by viewModel.state.collectAsStateWithLifecycle()

    var captionInputFocused by remember { mutableStateOf(false) }

    LaunchedEffect(songId) {
        viewModel.setSongId(songId)
    }

    Column(modifier = Modifier.fillMaxSize()) {
        Column(
            modifier = Modifier.weight(1f),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            AnimatedVisibility(
                visible = !captionInputFocused,
            ) {
                Box {
                    AsyncImage(
                        model = state.songImageUrl,
                        contentDescription = "Song Cover",
                        modifier = Modifier
                            .height(136.dp)
                            .width(92.dp)
                            .clip(RoundedCornerShape(10.dp))
                            .clickable(
                                enabled = state.editSongArtFlagEnabled,
                            ) {
                                onSongArtClicked.invoke()
                            },
                        placeholder = ColorPainter(ExtendedTheme.colors.backgroundSecondary),
                        error = ColorPainter(ExtendedTheme.colors.backgroundSecondary),
                        contentScale = ContentScale.Crop,
                    )

                    if (state.editSongArtFlagEnabled) {
                        Text(
                            modifier = Modifier
                                .padding(bottom = 4.dp)
                                .background(
                                    color = ExtendedTheme.colors.backgroundPrimary.copy(alpha = 0.7f),
                                    shape = RoundedCornerShape(10.dp),
                                )
                                .align(Alignment.BottomCenter)
                                .padding(horizontal = 4.dp),
                            text = stringResource(CommonResR.string.edit_song_art),
                            style = ExtendedTheme.typography.smallSubtitle.copy(fontSize = 10.sp),
                            color = ExtendedTheme.colors.textPrimary,
                        )
                    }

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

            SongDetailsMainInput(
                songTitle = state.songTitle,
                songCaptionInputValue = state.songCaptionInputValue,
                songCaptionLimit = state.songCaptionLimit,
                captionMentions = state.captionMentions,
                onTitleFocused = {
                    viewModel.sendEvent(
                        SongDetailsMviEvent.EditSongCaptionInputFocused(isInPostingMode),
                    )
                },
                onTitleUnfocused = {},
                onCaptionFocused = {
                    captionInputFocused = true
                    viewModel.sendEvent(
                        SongDetailsMviEvent.EditSongCaptionInputFocused(isInPostingMode),
                    )
                },
                onCaptionUnfocused = {
                    captionInputFocused = false
                },
                onTitleChanged = {
                    viewModel.sendEvent(
                        SongDetailsMviEvent.EditSongTitleInputChanged(
                            isInPostingMode = isInPostingMode,
                            text = it,
                        ),
                    )
                },
                onCaptionChanged = {
                    viewModel.sendEvent(
                        SongDetailsMviEvent.EditSongCaptionInputChanged(
                            isInPostingMode = isInPostingMode,
                            textFieldValue = it,
                        ),
                    )
                },
            )

            AnimatedVisibility(
                visible = captionInputFocused,
            ) {
                LazyColumn(
                    modifier = Modifier.fillMaxSize(),
                ) {
                    items(state.captionMentionTargets) { mention ->
                        Row(
                            modifier = Modifier
                                .fillMaxSize()
                                .padding(vertical = 8.dp)
                                .clickable { viewModel.addMentionToComment(mention) },
                        ) {
                            ProfileAvatarImage(
                                modifier = Modifier
                                    .padding(end = 8.dp)
                                    .size(44.dp),
                            )
                            Column(
                                modifier = Modifier.height(44.dp),
                                verticalArrangement = Arrangement.Center,
                            ) {
                                if (!mention.displayName.isNullOrEmpty()) {
                                    Text(
                                        text = mention.displayName ?: "",
                                        style = ExtendedTheme.typography.body,
                                        color = ExtendedTheme.colors.textPrimary,
                                    )
                                }
                                Text(
                                    text = "@" + mention.handle,
                                    style = ExtendedTheme.typography.body,
                                    color = ExtendedTheme.colors.textTertiary,
                                )
                            }
                        }
                    }
                }
            }

            AnimatedVisibility(
                visible = !captionInputFocused,
            ) {
                Column {
                    Spacer(modifier = Modifier.height(4.dp))

                    SongDetailsDivider()
                    SongDetailsOptionRow(
                        text = stringResource(CommonResR.string.edit_song_detais_action_lyrics),
                        iconRes = CommonUiR.drawable.lyrics,
                        onClick = {
                            focusManager.clearFocus()
                            viewModel.sendEvent(
                                SongDetailsMviEvent.EditSongLyricsClick(isInPostingMode = isInPostingMode),
                            )
                        },
                    )
                    SongDetailsDivider()

                    if (isInPostingMode) {
                        SongDetailsOptionRow(
                            text = stringResource(CommonResR.string.song_details_action_more_options),
                            iconRes = CommonUiR.drawable.gear,
                            onClick = {
                                focusManager.clearFocus()
                                viewModel.sendEvent(
                                    SongDetailsMviEvent.MoreOptionsClick(isInPostingMode = isInPostingMode),
                                )
                            },
                        )
                        SongDetailsDivider()
                    }
                }
            }

            if (isInPostingMode) {
                SunoMediumButton(
                    text = stringResource(CommonResR.string.post_song_details_button_submit),
                    onClick = {
                        viewModel.sendEvent(SongDetailsMviEvent.PostSongSubmitClicked)
                    },
                    modifier = Modifier.fillMaxWidth(),
                )

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

@Composable
private fun SongDetailsDivider() {
    HorizontalDivider(color = ExtendedTheme.colors.backgroundTertiary)
}