/*
 * 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.core.ui.widget.image

import android.net.Uri
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.asPaddingValues
import androidx.compose.foundation.layout.aspectRatio
import androidx.compose.foundation.layout.calculateEndPadding
import androidx.compose.foundation.layout.calculateStartPadding
import androidx.compose.foundation.layout.displayCutout
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
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.platform.LocalLayoutDirection
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import androidx.core.net.toUri
import com.t8rin.imagetoolbox.core.domain.image.model.ImageFrames
import com.t8rin.imagetoolbox.core.resources.Icons
import com.t8rin.imagetoolbox.core.resources.R
import com.t8rin.imagetoolbox.core.resources.icons.AddPhotoAlt
import com.t8rin.imagetoolbox.core.ui.utils.content_pickers.rememberImagePicker
import com.t8rin.imagetoolbox.core.ui.utils.navigation.Screen
import com.t8rin.imagetoolbox.core.ui.widget.enhanced.hapticsClickable
import com.t8rin.imagetoolbox.core.ui.widget.modifier.container
import com.t8rin.imagetoolbox.core.ui.widget.utils.AutoContentBasedColors

@Composable
fun ImagePreviewGrid(
    data: List<Uri>?,
    onNavigate: (Screen) -> Unit,
    imageFrames: ImageFrames?,
    onFrameSelectionChange: (ImageFrames) -> Unit,
    onAddImages: ((List<Uri>) -> Unit)?,
    onShareImage: (Uri) -> Unit,
    onRemove: ((Uri) -> Unit)?,
    verticalCellSize: Dp = 120.dp,
    horizontalCellSize: Dp = verticalCellSize,
    contentPadding: PaddingValues? = null,
    isSelectable: Boolean = false,
    initialShowImagePreviewDialog: Boolean = false,
    modifier: Modifier = Modifier
) {
    val imagePicker = rememberImagePicker { uriList: List<Uri> ->
        val uris = (data ?: emptyList()).toMutableList()
        uriList.forEach {
            if (it !in uris) uris.add(it)
        }
        onAddImages?.invoke(uris)
    }

    var selectedUri by rememberSaveable(initialShowImagePreviewDialog) {
        mutableStateOf(
            if (initialShowImagePreviewDialog) data?.firstOrNull()?.toString()
            else null
        )
    }

    val cutout = WindowInsets.displayCutout.asPaddingValues()
    val direction = LocalLayoutDirection.current

    var isSelectionMode by rememberSaveable {
        mutableStateOf(false)
    }
    var isSelectionModePrevious by rememberSaveable {
        mutableStateOf(false)
    }
    LaunchedEffect(imageFrames, isSelectable, data?.size) {
        val hasSelectedFrames = imageFrames
            ?.getFramePositions(data.orEmpty().size)
            ?.isNotEmpty() == true
        isSelectionMode = isSelectable && hasSelectedFrames
        isSelectionModePrevious = isSelectionMode
    }

    ImagesPreviewWithSelection(
        imageUris = data.orEmpty(),
        imageFrames = imageFrames ?: ImageFrames.ManualSelection(emptyList()),
        modifier = modifier,
        onFrameSelectionChange = {
            if (it.isEmpty()) {
                isSelectionMode = false
            }
            onFrameSelectionChange(it)
        },
        isPortrait = false,
        isLoadingImages = false,
        isAutoExpandLayout = false,
        onError = {
            onRemove?.invoke(it.toUri())
        },
        contentPadding = contentPadding ?: PaddingValues(
            bottom = 88.dp + WindowInsets
                .navigationBars
                .asPaddingValues()
                .calculateBottomPadding(),
            top = 12.dp,
            end = 12.dp + cutout.calculateEndPadding(direction),
            start = 12.dp + cutout.calculateStartPadding(direction)
        ),
        isSelectionMode = isSelectionMode,
        onItemClick = { index ->
            if (!isSelectionModePrevious) {
                data?.get(index)?.let {
                    selectedUri = it.toString()
                }
            }
            isSelectionModePrevious = isSelectionMode
        },
        onItemLongClick = {
            isSelectionModePrevious = true
            isSelectionMode = true
        },
        verticalCellSize = verticalCellSize,
        horizontalCellSize = horizontalCellSize,
        aboveImageContent = {},
        isAboveImageScrimEnabled = isSelectionMode,
        endAdditionalItem = if (!isSelectionMode && !data.isNullOrEmpty() && onAddImages != null) {
            {
                Box(
                    modifier = Modifier
                        .fillMaxSize()
                        .aspectRatio(1f)
                        .container(
                            shape = MaterialTheme.shapes.extraSmall,
                            resultPadding = 0.dp,
                            color = MaterialTheme.colorScheme.tertiaryContainer.copy(0.3f)
                        )
                        .hapticsClickable(onClick = imagePicker::pickImage),
                    contentAlignment = Alignment.Center
                ) {
                    Icon(
                        imageVector = Icons.Rounded.AddPhotoAlt,
                        contentDescription = stringResource(R.string.pick_images),
                        modifier = Modifier.fillMaxSize(0.4f),
                        tint = MaterialTheme.colorScheme.onTertiaryContainer.copy(0.8f)
                    )
                }
            }
        } else null,
        isContentAlignToCenter = false,
        enableSelection = isSelectable
    )

    ImagePager(
        visible = !selectedUri.isNullOrEmpty() && !data.isNullOrEmpty(),
        selectedUri = selectedUri?.toUri(),
        uris = data,
        onUriSelected = {
            selectedUri = it?.toString()
        },
        onShare = onShareImage,
        onDismiss = { selectedUri = null },
        onNavigate = {
            selectedUri = null
            onNavigate(it)
        }
    )

    AutoContentBasedColors(
        model = selectedUri
    )
}