/*
 * ImageToolbox is an image editor for android
 * Copyright (c) 2026 T8RIN (Malik Mukhametzyanov)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * You should have received a copy of the Apache License
 * along with this program.  If not, see <http://www.apache.org/licenses/LICENSE-2.0>.
 */

package com.t8rin.imagetoolbox.feature.erase_background.presentation

import android.graphics.Bitmap
import android.net.Uri
import androidx.compose.animation.AnimatedContent
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.togetherWith
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.asPaddingValues
import androidx.compose.foundation.layout.aspectRatio
import androidx.compose.foundation.layout.calculateStartPadding
import androidx.compose.foundation.layout.displayCutout
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.navigationBarsPadding
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.SheetValue
import androidx.compose.runtime.Composable
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.ImageBitmap
import androidx.compose.ui.graphics.asImageBitmap
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import com.t8rin.imagetoolbox.core.domain.image.model.ImageFormatGroup
import com.t8rin.imagetoolbox.core.domain.model.pt
import com.t8rin.imagetoolbox.core.resources.Icons
import com.t8rin.imagetoolbox.core.resources.R
import com.t8rin.imagetoolbox.core.resources.icons.Delete
import com.t8rin.imagetoolbox.core.resources.icons.Redo
import com.t8rin.imagetoolbox.core.resources.icons.Tune
import com.t8rin.imagetoolbox.core.resources.icons.Undo
import com.t8rin.imagetoolbox.core.settings.presentation.provider.LocalSettingsState
import com.t8rin.imagetoolbox.core.ui.theme.outlineVariant
import com.t8rin.imagetoolbox.core.ui.utils.content_pickers.Picker
import com.t8rin.imagetoolbox.core.ui.utils.content_pickers.rememberImagePicker
import com.t8rin.imagetoolbox.core.ui.utils.helper.Clipboard
import com.t8rin.imagetoolbox.core.ui.utils.helper.isPortraitOrientationAsState
import com.t8rin.imagetoolbox.core.ui.utils.provider.LocalScreenSize
import com.t8rin.imagetoolbox.core.ui.widget.AdaptiveBottomScaffoldLayoutScreen
import com.t8rin.imagetoolbox.core.ui.widget.buttons.BottomButtonsBlock
import com.t8rin.imagetoolbox.core.ui.widget.buttons.PanModeButton
import com.t8rin.imagetoolbox.core.ui.widget.buttons.ShareButton
import com.t8rin.imagetoolbox.core.ui.widget.controls.SaveExifWidget
import com.t8rin.imagetoolbox.core.ui.widget.controls.selection.HelperGridParamsSelector
import com.t8rin.imagetoolbox.core.ui.widget.controls.selection.ImageFormatSelector
import com.t8rin.imagetoolbox.core.ui.widget.controls.selection.MagnifierEnabledSelector
import com.t8rin.imagetoolbox.core.ui.widget.dialogs.ExitWithoutSavingDialog
import com.t8rin.imagetoolbox.core.ui.widget.dialogs.LoadingDialog
import com.t8rin.imagetoolbox.core.ui.widget.dialogs.OneTimeImagePickingDialog
import com.t8rin.imagetoolbox.core.ui.widget.dialogs.OneTimeSaveLocationSelectionDialog
import com.t8rin.imagetoolbox.core.ui.widget.enhanced.EnhancedIconButton
import com.t8rin.imagetoolbox.core.ui.widget.image.AutoFilePicker
import com.t8rin.imagetoolbox.core.ui.widget.image.ImageNotPickedWidget
import com.t8rin.imagetoolbox.core.ui.widget.modifier.ShapeDefaults
import com.t8rin.imagetoolbox.core.ui.widget.modifier.container
import com.t8rin.imagetoolbox.core.ui.widget.other.BoxAnimatedVisibility
import com.t8rin.imagetoolbox.core.ui.widget.other.DrawLockScreenOrientation
import com.t8rin.imagetoolbox.core.ui.widget.other.TopAppBarEmoji
import com.t8rin.imagetoolbox.core.ui.widget.saver.PtSaver
import com.t8rin.imagetoolbox.core.ui.widget.sheets.ProcessImagesPreferenceSheet
import com.t8rin.imagetoolbox.core.ui.widget.text.TopAppBarTitle
import com.t8rin.imagetoolbox.core.ui.widget.utils.AutoContentBasedColors
import com.t8rin.imagetoolbox.feature.draw.domain.DrawMode
import com.t8rin.imagetoolbox.feature.draw.domain.DrawPathMode
import com.t8rin.imagetoolbox.feature.draw.presentation.components.BrushSoftnessSelector
import com.t8rin.imagetoolbox.feature.draw.presentation.components.DrawPathModeSelector
import com.t8rin.imagetoolbox.feature.draw.presentation.components.LineWidthSelector
import com.t8rin.imagetoolbox.feature.erase_background.presentation.components.AutoEraseBackgroundCard
import com.t8rin.imagetoolbox.feature.erase_background.presentation.components.BitmapEraser
import com.t8rin.imagetoolbox.feature.erase_background.presentation.components.OriginalImagePreviewAlphaSelector
import com.t8rin.imagetoolbox.feature.erase_background.presentation.components.RecoverModeButton
import com.t8rin.imagetoolbox.feature.erase_background.presentation.components.RecoverModeCard
import com.t8rin.imagetoolbox.feature.erase_background.presentation.components.TrimImageToggle
import com.t8rin.imagetoolbox.feature.erase_background.presentation.screenLogic.EraseBackgroundComponent
import kotlinx.coroutines.launch

@Composable
fun EraseBackgroundContent(
    component: EraseBackgroundComponent,
) {
    val settingsState = LocalSettingsState.current

    val scope = rememberCoroutineScope()

    AutoContentBasedColors(component.bitmap)

    var showExitDialog by rememberSaveable { mutableStateOf(false) }


    val imagePicker = rememberImagePicker { uri: Uri ->
        component.setUri(uri)
    }

    val pickImage = imagePicker::pickImage

    AutoFilePicker(
        onAutoPick = pickImage,
        isPickedAlready = component.initialUri != null
    )

    val onBack = {
        if (component.haveChanges) showExitDialog = true
        else component.onGoBack()
    }

    val saveBitmap: (oneTimeSaveLocationUri: String?) -> Unit = {
        component.saveBitmap(
            oneTimeSaveLocationUri = it
        )
    }

    var strokeWidth by rememberSaveable(stateSaver = PtSaver) {
        mutableStateOf(
            settingsState.defaultDrawLineWidth.pt
        )
    }
    var brushSoftness by rememberSaveable(stateSaver = PtSaver) {
        mutableStateOf(
            0.pt
        )
    }

    val drawPathMode = component.drawPathMode

    var originalImagePreviewAlpha by rememberSaveable {
        mutableFloatStateOf(0.2f)
    }

    val screenSize = LocalScreenSize.current
    val isPortrait by isPortraitOrientationAsState()

    var panEnabled by rememberSaveable { mutableStateOf(false) }

    val secondaryControls = @Composable {
        PanModeButton(
            selected = panEnabled,
            onClick = {
                panEnabled = !panEnabled
            }
        )
        EnhancedIconButton(
            containerColor = Color.Transparent,
            borderColor = MaterialTheme.colorScheme.outlineVariant(
                luminance = 0.1f
            ),
            onClick = { component.undo() },
            enabled = component.lastPaths.isNotEmpty() || component.paths.isNotEmpty()
        ) {
            Icon(
                imageVector = Icons.Rounded.Undo,
                contentDescription = "Undo"
            )
        }
        EnhancedIconButton(
            containerColor = Color.Transparent,
            borderColor = MaterialTheme.colorScheme.outlineVariant(
                luminance = 0.1f
            ),
            onClick = { component.redo() },
            enabled = component.undonePaths.isNotEmpty()
        ) {
            Icon(
                imageVector = Icons.Rounded.Redo,
                contentDescription = "Redo"
            )
        }
    }

    AdaptiveBottomScaffoldLayoutScreen(
        title = {
            TopAppBarTitle(
                title = stringResource(R.string.background_remover),
                input = component.bitmap,
                isLoading = component.isImageLoading,
                size = null,
                originalSize = null
            )
        },
        onGoBack = onBack,
        shouldDisableBackHandler = !component.haveChanges,
        actions = {
            secondaryControls()
            RecoverModeButton(
                selected = component.isRecoveryOn,
                enabled = !panEnabled,
                onClick = component::toggleEraser
            )
        },
        topAppBarPersistentActions = { scaffoldState ->
            if (component.bitmap == null) TopAppBarEmoji()
            else {
                if (isPortrait) {
                    EnhancedIconButton(
                        onClick = {
                            scope.launch {
                                if (scaffoldState.bottomSheetState.currentValue == SheetValue.Expanded) {
                                    scaffoldState.bottomSheetState.partialExpand()
                                } else {
                                    scaffoldState.bottomSheetState.expand()
                                }
                            }
                        },
                    ) {
                        Icon(
                            imageVector = Icons.Rounded.Tune,
                            contentDescription = stringResource(R.string.properties)
                        )
                    }
                }
                var editSheetData by remember {
                    mutableStateOf(listOf<Uri>())
                }
                ShareButton(
                    enabled = component.bitmap != null,
                    onShare = component::shareBitmap,
                    onCopy = {
                        component.cacheCurrentImage(Clipboard::copy)
                    },
                    onEdit = {
                        component.cacheCurrentImage { uri ->
                            editSheetData = listOf(uri)
                        }
                    }
                )
                ProcessImagesPreferenceSheet(
                    uris = editSheetData,
                    visible = editSheetData.isNotEmpty(),
                    onDismiss = {
                        editSheetData = emptyList()
                    },
                    onNavigate = component.onNavigate
                )
                EnhancedIconButton(
                    onClick = { component.clearDrawing() },
                    enabled = component.paths.isNotEmpty()
                ) {
                    Icon(
                        imageVector = Icons.Outlined.Delete,
                        contentDescription = stringResource(R.string.delete)
                    )
                }
            }
        },
        mainContent = {
            AnimatedContent(
                targetState = remember(component.bitmap) {
                    derivedStateOf {
                        component.bitmap?.copy(
                            Bitmap.Config.ARGB_8888,
                            true
                        )?.asImageBitmap() ?: ImageBitmap(
                            screenSize.widthPx,
                            screenSize.heightPx
                        )
                    }
                }.value,
                transitionSpec = { fadeIn() togetherWith fadeOut() }
            ) { imageBitmap ->
                val direction = LocalLayoutDirection.current
                val aspectRatio = imageBitmap.width / imageBitmap.height.toFloat()
                BitmapEraser(
                    imageBitmapForShader = component.internalBitmap?.asImageBitmap(),
                    imageBitmap = imageBitmap,
                    paths = component.paths,
                    strokeWidth = strokeWidth,
                    brushSoftness = brushSoftness,
                    onAddPath = component::addPath,
                    isRecoveryOn = component.isRecoveryOn,
                    modifier = Modifier
                        .padding(
                            start = WindowInsets
                                .displayCutout
                                .asPaddingValues()
                                .calculateStartPadding(direction)
                        )
                        .padding(16.dp)
                        .aspectRatio(
                            ratio = aspectRatio,
                            matchHeightConstraintsFirst = isPortrait
                        )
                        .fillMaxSize(),
                    panEnabled = panEnabled,
                    originalImagePreviewAlpha = originalImagePreviewAlpha,
                    drawPathMode = drawPathMode,
                    helperGridParams = component.helperGridParams
                )
            }
        },
        controls = { scaffoldState ->
            Column(
                modifier = Modifier.padding(16.dp),
                verticalArrangement = Arrangement.spacedBy(8.dp),
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                if (!isPortrait) {
                    Row(
                        modifier = Modifier
                            .padding(vertical = 8.dp)
                            .container(shape = ShapeDefaults.circle)
                    ) {
                        secondaryControls()
                    }
                }
                RecoverModeCard(
                    modifier = Modifier.fillMaxWidth(),
                    selected = component.isRecoveryOn,
                    enabled = !panEnabled,
                    onClick = component::toggleEraser
                )
                AutoEraseBackgroundCard(
                    modifier = Modifier.fillMaxWidth(),
                    onClick = { modelType ->
                        scope.launch {
                            scaffoldState.bottomSheetState.partialExpand()
                            component.autoEraseBackground(
                                modelType = modelType
                            )
                        }
                    },
                    onReset = component::resetImage
                )
                OriginalImagePreviewAlphaSelector(
                    value = originalImagePreviewAlpha,
                    onValueChange = {
                        originalImagePreviewAlpha = it
                    },
                    modifier = Modifier.fillMaxWidth()
                )
                DrawPathModeSelector(
                    modifier = Modifier.fillMaxWidth(),
                    value = drawPathMode,
                    onValueChange = component::updateDrawPathMode,
                    values = remember {
                        listOf(
                            DrawPathMode.Free,
                            DrawPathMode.FloodFill(),
                            DrawPathMode.Spray(),
                            DrawPathMode.Line,
                            DrawPathMode.Lasso,
                            DrawPathMode.Rect(),
                            DrawPathMode.Oval
                        )
                    },
                    drawMode = DrawMode.Pen
                )
                BoxAnimatedVisibility(drawPathMode.canChangeStrokeWidth) {
                    LineWidthSelector(
                        modifier = Modifier.fillMaxWidth(),
                        value = strokeWidth.value,
                        onValueChange = { strokeWidth = it.pt }
                    )
                }
                BrushSoftnessSelector(
                    modifier = Modifier.fillMaxWidth(),
                    value = brushSoftness.value,
                    onValueChange = { brushSoftness = it.pt }
                )
                TrimImageToggle(
                    checked = component.trimImage,
                    onCheckedChange = { component.setTrimImage(it) },
                    modifier = Modifier.fillMaxWidth()
                )
                HelperGridParamsSelector(
                    value = component.helperGridParams,
                    onValueChange = component::updateHelperGridParams,
                    modifier = Modifier.fillMaxWidth()
                )
                MagnifierEnabledSelector(
                    modifier = Modifier.fillMaxWidth(),
                    shape = ShapeDefaults.extraLarge,
                )
                SaveExifWidget(
                    imageFormat = component.imageFormat,
                    checked = component.saveExif,
                    onCheckedChange = component::setSaveExif,
                    modifier = Modifier.fillMaxWidth()
                )
                ImageFormatSelector(
                    modifier = Modifier.navigationBarsPadding(),
                    entries = ImageFormatGroup.alphaContainedEntries,
                    value = component.imageFormat,
                    onValueChange = component::setImageFormat
                )
            }
        },
        buttons = {
            var showOneTimeImagePickingDialog by rememberSaveable {
                mutableStateOf(false)
            }
            var showFolderSelectionDialog by rememberSaveable {
                mutableStateOf(false)
            }
            BottomButtonsBlock(
                isNoData = component.bitmap == null,
                onSecondaryButtonClick = pickImage,
                onSecondaryButtonLongClick = {
                    showOneTimeImagePickingDialog = true
                },
                onPrimaryButtonClick = {
                    saveBitmap(null)
                },
                onPrimaryButtonLongClick = {
                    showFolderSelectionDialog = true
                },
                actions = {
                    if (isPortrait) it()
                },
                drawBothStrokes = true
            )
            OneTimeSaveLocationSelectionDialog(
                visible = showFolderSelectionDialog,
                onDismiss = { showFolderSelectionDialog = false },
                onSaveRequest = saveBitmap,
                formatForFilenameSelection = component.getFormatForFilenameSelection()
            )
            OneTimeImagePickingDialog(
                onDismiss = { showOneTimeImagePickingDialog = false },
                picker = Picker.Single,
                imagePicker = imagePicker,
                visible = showOneTimeImagePickingDialog
            )
        },
        noDataControls = {
            ImageNotPickedWidget(
                onPickImage = pickImage
            )
        },
        canShowScreenData = component.bitmap != null,
        showActionsInTopAppBar = false,
        mainContentWeight = 0.65f
    )

    LoadingDialog(
        visible = component.isSaving || component.isImageLoading || component.isErasingBG,
        onCancelLoading = component::cancelSaving,
        canCancel = component.isSaving
    )

    ExitWithoutSavingDialog(
        onExit = component.onGoBack,
        onDismiss = { showExitDialog = false },
        visible = showExitDialog
    )

    DrawLockScreenOrientation()
}