/*
 * 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.color_tools.presentation.components

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.MaterialTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
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.res.stringResource
import androidx.compose.ui.unit.dp
import com.t8rin.colors.parser.ColorWithName
import com.t8rin.dynamic.theme.ColorTuple
import com.t8rin.imagetoolbox.core.resources.Icons
import com.t8rin.imagetoolbox.core.resources.R
import com.t8rin.imagetoolbox.core.resources.icons.Blender
import com.t8rin.imagetoolbox.core.ui.widget.controls.selection.ColorRowSelector
import com.t8rin.imagetoolbox.core.ui.widget.dialogs.ColorCopyFormatSelectionDialog
import com.t8rin.imagetoolbox.core.ui.widget.enhanced.EnhancedSliderItem
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.ColorWithNameItem
import com.t8rin.imagetoolbox.core.ui.widget.other.ExpandableItem
import com.t8rin.imagetoolbox.core.ui.widget.saver.ColorSaver
import com.t8rin.imagetoolbox.core.ui.widget.text.TitleItem
import kotlin.math.roundToInt

@Composable
internal fun ColorMixing(
    selectedColor: Color,
    appColorTuple: ColorTuple,
) {
    var mixingVariation by rememberSaveable {
        mutableIntStateOf(3)
    }
    var colorToMix by rememberSaveable(
        stateSaver = ColorSaver
    ) {
        mutableStateOf(appColorTuple.tertiary ?: Color.Yellow)
    }
    val mixedColors by remember(selectedColor, mixingVariation, colorToMix) {
        derivedStateOf {
            selectedColor.mixWith(
                color = colorToMix,
                variations = mixingVariation,
                maxPercent = 1f
            )
        }
    }
    var colorCopyTarget by remember {
        mutableStateOf<ColorWithName?>(null)
    }

    ExpandableItem(
        visibleContent = {
            TitleItem(
                text = stringResource(R.string.color_mixing),
                icon = Icons.Rounded.Blender,
                modifier = Modifier.padding(12.dp)
            )
        },
        expandableContent = {
            Column(
                modifier = Modifier.padding(
                    start = 16.dp,
                    end = 16.dp,
                    bottom = 8.dp
                ),
            ) {
                ColorRowSelector(
                    value = colorToMix,
                    onValueChange = { colorToMix = it },
                    modifier = Modifier
                        .fillMaxWidth()
                        .container(
                            color = MaterialTheme.colorScheme.surface,
                            shape = ShapeDefaults.top
                        ),
                    title = stringResource(R.string.color_to_mix)
                )
                Spacer(modifier = Modifier.height(4.dp))
                EnhancedSliderItem(
                    value = mixingVariation,
                    title = stringResource(R.string.variation),
                    valueRange = 2f..20f,
                    onValueChange = { mixingVariation = it.roundToInt() },
                    internalStateTransformation = { it.roundToInt() },
                    shape = ShapeDefaults.bottom,
                    behaveAsContainer = true,
                    containerColor = MaterialTheme.colorScheme.surface,
                    steps = 17
                )
                Spacer(modifier = Modifier.height(16.dp))
                Column(
                    modifier = Modifier.fillMaxWidth(),
                    verticalArrangement = Arrangement.spacedBy(4.dp),
                    horizontalAlignment = Alignment.CenterHorizontally
                ) {
                    mixedColors.forEachIndexed { index, color ->
                        ColorWithNameItem(
                            color = color,
                            containerShape = ShapeDefaults.byIndex(
                                index = index,
                                size = mixedColors.size
                            ),
                            onCopy = { name ->
                                colorCopyTarget = ColorWithName(
                                    color = color,
                                    name = name
                                )
                            }
                        )
                    }
                }
            }
        },
        shape = ShapeDefaults.extraLarge,
        initialState = false
    )

    ColorCopyFormatSelectionDialog(
        target = colorCopyTarget,
        onDismiss = { colorCopyTarget = null }
    )
}