/*
 * 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.permissioncontroller.permission.ui.wear

import android.os.Build
import android.permission.flags.Flags
import androidx.annotation.RequiresApi
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.livedata.observeAsState
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import com.android.modules.utils.build.SdkLevel
import com.android.permissioncontroller.R
import com.android.permissioncontroller.permission.ui.handheld.v31.PermissionUsageControlPreference
import com.android.permissioncontroller.permission.ui.viewmodel.v31.PermissionUsageViewModel
import com.android.permissioncontroller.permission.ui.viewmodel.v31.PermissionUsagesUiState
import com.android.permissioncontroller.permission.utils.Utils
import com.android.permissioncontroller.wear.permission.components.ScrollableScreen
import com.android.permissioncontroller.wear.permission.components.material3.WearPermissionButton
import com.android.permissioncontroller.wear.permission.components.material3.WearPermissionIconBuilder
import java.text.Collator

@RequiresApi(Build.VERSION_CODES.S)
@Composable
fun WearPermissionUsageScreen(sessionId: Long, viewModel: PermissionUsageViewModel) {
    val context = LocalContext.current
    val permissionUsagesUiData = viewModel.permissionUsagesUiLiveData.observeAsState(null)
    val showSystem = viewModel.showSystemAppsLiveData.observeAsState(false)
    var isLoading by remember { mutableStateOf(true) }
    val isDataLoaded = permissionUsagesUiData.value is PermissionUsagesUiState.Success
    val hasSystemApps: Boolean =
        if (isDataLoaded) {
            val uiState = permissionUsagesUiData.value as PermissionUsagesUiState.Success
            uiState.containsSystemAppUsage
        } else {
            false
        }

    val onShowSystemClick: (Boolean) -> Unit = { show -> run { viewModel.updateShowSystem(show) } }

    val permissionGroupWithUsageCounts: Map<String, Int> =
        if (isDataLoaded) {
            val uiState = permissionUsagesUiData.value as PermissionUsagesUiState.Success
            uiState.permissionGroupUsageCount
        } else {
            emptyMap()
        }
    val permissionGroupWithUsageCountsEntries: List<Map.Entry<String, Int>> =
        ArrayList<Map.Entry<String, Int>>(permissionGroupWithUsageCounts.entries)

    val collator = Collator.getInstance(context.resources.configuration.locales.get(0))
    val permissionGroupPreferences =
        permissionGroupWithUsageCountsEntries
            // Removing Health Connect from the list of permissions to fix b/331260850
            .let {
                if (SdkLevel.isAtLeastB()) {
                    it
                } else {
                    it.filterNot { Utils.isHealthPermissionGroup(it.key) }
                }
            }
            .map {
                PermissionUsageControlPreference(
                    context,
                    it.key,
                    it.value,
                    showSystem.value,
                    sessionId,
                    false,
                )
            }
            .sortedWith { o1, o2 ->
                var result = collator.compare(o1.title.toString(), o2.title.toString())
                if (result == 0) {
                    result = o1.title.toString().compareTo(o2.title.toString())
                }
                result
            }
            .toList()

    WearPermissionUsageContent(
        isLoading,
        hasSystemApps,
        showSystem.value,
        onShowSystemClick,
        permissionGroupPreferences,
    )

    if (isLoading && isDataLoaded) {
        isLoading = false
    }
}

@Composable
internal fun WearPermissionUsageContent(
    isLoading: Boolean,
    hasSystemApps: Boolean,
    showSystem: Boolean,
    onShowSystemClick: (Boolean) -> Unit,
    permissionGroupPreferences: List<PermissionUsageControlPreference>,
) {
    ScrollableScreen(
        title = stringResource(R.string.permission_usage_title),
        isLoading = isLoading,
    ) {
        if (permissionGroupPreferences.isEmpty()) {
            item {
                WearPermissionButton(label = stringResource(R.string.no_permissions), onClick = {})
            }
        } else {
            for (preference in permissionGroupPreferences) {
                item {
                    WearPermissionButton(
                        label = preference.title.toString(),
                        labelMaxLines = Int.MAX_VALUE,
                        secondaryLabel = preference.summary.toString(),
                        secondaryLabelMaxLines = Int.MAX_VALUE,
                        iconBuilder =
                            preference.icon?.let { WearPermissionIconBuilder.builder(it) },
                        enabled = preference.isEnabled,
                        onClick = { preference.performClick() },
                    )
                }
            }
            if (hasSystemApps) {
                item {
                    WearPermissionButton(
                        label =
                            if (showSystem) {
                                stringResource(R.string.menu_hide_system)
                            } else {
                                stringResource(R.string.menu_show_system)
                            },
                        labelMaxLines = Int.MAX_VALUE,
                        onClick = { onShowSystemClick(!showSystem) },
                        modifier = Modifier.fillMaxWidth(),
                    )
                }
            }
        }
    }
}