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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*
*/
package com.android.customization.picker.color.ui.viewmodel
import android.content.Context
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.viewModelScope
import com.android.customization.model.color.ColorOptionImpl
import com.android.customization.module.logging.ThemesUserEventLogger
import com.android.customization.picker.color.domain.interactor.ColorPickerInteractor
import com.android.customization.picker.color.shared.model.ColorType
import com.android.wallpaper.R
import com.android.wallpaper.picker.common.text.ui.viewmodel.Text
import com.android.wallpaper.picker.option.ui.viewmodel.OptionItemViewModel
import kotlin.math.max
import kotlin.math.min
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.shareIn
import kotlinx.coroutines.flow.stateIn
import kotlinx.coroutines.launch
/** Models UI state for a color picker experience. */
class ColorPickerViewModel
private constructor(
context: Context,
private val interactor: ColorPickerInteractor,
private val logger: ThemesUserEventLogger,
) : ViewModel() {
private val selectedColorTypeTabId = MutableStateFlow<ColorType?>(null)
/** View-models for each color tab. */
val colorTypeTabs: Flow<Map<ColorType, ColorTypeTabViewModel>> =
combine(
interactor.colorOptions,
selectedColorTypeTabId,
) { colorOptions, selectedColorTypeIdOrNull ->
colorOptions.keys
.mapIndexed { index, colorType ->
val isSelected =
(selectedColorTypeIdOrNull == null && index == 0) ||
selectedColorTypeIdOrNull == colorType
colorType to
ColorTypeTabViewModel(
name =
when (colorType) {
ColorType.WALLPAPER_COLOR ->
context.resources.getString(R.string.wallpaper_color_tab)
ColorType.PRESET_COLOR ->
context.resources.getString(R.string.preset_color_tab_2)
},
isSelected = isSelected,
onClick =
if (isSelected) {
null
} else {
{ this.selectedColorTypeTabId.value = colorType }
},
)
}
.toMap()
}
/** View-models for each color tab subheader */
val colorTypeTabSubheader: Flow<String> =
selectedColorTypeTabId.map { selectedColorTypeIdOrNull ->
when (selectedColorTypeIdOrNull ?: ColorType.WALLPAPER_COLOR) {
ColorType.WALLPAPER_COLOR ->
context.resources.getString(R.string.wallpaper_color_subheader)
ColorType.PRESET_COLOR ->
context.resources.getString(R.string.preset_color_subheader)
}
}
/** The list of all color options mapped by their color type */
private val allColorOptions:
Flow<Map<ColorType, List<OptionItemViewModel<ColorOptionIconViewModel>>>> =
interactor.colorOptions
.map { colorOptions ->
colorOptions
.map { colorOptionEntry ->
colorOptionEntry.key to
colorOptionEntry.value.map { colorOptionModel ->
val colorOption: ColorOptionImpl =
colorOptionModel.colorOption as ColorOptionImpl
val lightThemeColors =
colorOption.previewInfo.resolveColors(/* darkTheme= */ false)
val darkThemeColors =
colorOption.previewInfo.resolveColors(/* darkTheme= */ true)
val isSelectedFlow: StateFlow<Boolean> =
interactor.activeColorOption
.map {
it?.colorOption?.isEquivalent(
colorOptionModel.colorOption
)
?: colorOptionModel.isSelected
}
.stateIn(viewModelScope)
OptionItemViewModel<ColorOptionIconViewModel>(
key =
MutableStateFlow(colorOptionModel.key) as StateFlow<String>,
payload =
ColorOptionIconViewModel(
lightThemeColor0 = lightThemeColors[0],
lightThemeColor1 = lightThemeColors[1],
lightThemeColor2 = lightThemeColors[2],
lightThemeColor3 = lightThemeColors[3],
darkThemeColor0 = darkThemeColors[0],
darkThemeColor1 = darkThemeColors[1],
darkThemeColor2 = darkThemeColors[2],
darkThemeColor3 = darkThemeColors[3],
),
text =
Text.Loaded(
colorOption.getContentDescription(context).toString()
),
isTextUserVisible = false,
isSelected = isSelectedFlow,
onClicked =
isSelectedFlow.map { isSelected ->
if (isSelected) {
null
} else {
{
viewModelScope.launch {
interactor.select(colorOptionModel)
logger.logThemeColorApplied(
colorOptionModel.colorOption
.sourceForLogging,
colorOptionModel.colorOption
.styleForLogging,
colorOptionModel.colorOption
.seedColorForLogging,
)
}
}
}
},
)
}
}
.toMap()
}
.shareIn(
scope = viewModelScope,
started = SharingStarted.WhileSubscribed(),
replay = 1,
)
/** The list of all available color options for the selected Color Type. */
val colorOptions: Flow<List<OptionItemViewModel<ColorOptionIconViewModel>>> =
combine(allColorOptions, selectedColorTypeTabId) {
allColorOptions:
Map<ColorType, List<OptionItemViewModel<ColorOptionIconViewModel>>>,
selectedColorTypeIdOrNull ->
val selectedColorTypeId = selectedColorTypeIdOrNull ?: ColorType.WALLPAPER_COLOR
allColorOptions[selectedColorTypeId]!!
}
.shareIn(
scope = viewModelScope,
started = SharingStarted.Eagerly,
replay = 1,
)
/** The list of color options for the color section */
val colorSectionOptions: Flow<List<OptionItemViewModel<ColorOptionIconViewModel>>> =
allColorOptions
.map { allColorOptions ->
val wallpaperOptions = allColorOptions[ColorType.WALLPAPER_COLOR]
val presetOptions = allColorOptions[ColorType.PRESET_COLOR]
val subOptions =
wallpaperOptions!!.subList(
0,
min(COLOR_SECTION_OPTION_SIZE, wallpaperOptions.size)
)
// Add additional options based on preset colors if size of wallpaper color options
// is
// less than COLOR_SECTION_OPTION_SIZE
val additionalSubOptions =
presetOptions!!.subList(
0,
min(
max(0, COLOR_SECTION_OPTION_SIZE - wallpaperOptions.size),
presetOptions.size,
)
)
subOptions + additionalSubOptions
}
.shareIn(
scope = viewModelScope,
started = SharingStarted.WhileSubscribed(),
replay = 1,
)
class Factory(
private val context: Context,
private val interactor: ColorPickerInteractor,
private val logger: ThemesUserEventLogger,
) : ViewModelProvider.Factory {
override fun <T : ViewModel> create(modelClass: Class<T>): T {
@Suppress("UNCHECKED_CAST")
return ColorPickerViewModel(
context = context,
interactor = interactor,
logger = logger,
)
as T
}
}
companion object {
private const val COLOR_SECTION_OPTION_SIZE = 5
}
}
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