/*
 * Copyright 2024 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
 *
 *     https://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.multiuser.widget

import android.appwidget.AppWidgetManager
import android.content.Context
import android.util.Log
import androidx.appcompat.app.AppCompatDelegate

import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.rememberCoroutineScope
import androidx.glance.appwidget.GlanceAppWidget
import androidx.glance.appwidget.SizeMode
import androidx.glance.appwidget.provideContent
import androidx.glance.GlanceId
import androidx.glance.GlanceTheme
import androidx.glance.LocalContext
import androidx.glance.appwidget.LocalAppWidgetOptions

import com.android.multiuser.widget.domain.ILoadUsersUseCase
import com.android.multiuser.widget.domain.LoadCurrentUserUseCase
import com.android.multiuser.widget.data.ActionsRepository
import com.android.multiuser.widget.data.ImageRepository
import com.android.multiuser.widget.data.UsersRepository
import com.android.multiuser.widget.ui.SystemUiColorProviders
import com.android.multiuser.widget.ui.view.LayoutView
import com.android.multiuser.widget.ui.view.layout.ErrorLayout
import com.android.multiuser.widget.ui.view.layout.LoadingLayout
import com.android.multiuser.widget.viewmodel.UiState
import com.android.multiuser.widget.viewmodel.UsersViewModel

import androidx.datastore.preferences.core.Preferences
import androidx.glance.currentState
import androidx.glance.state.PreferencesGlanceStateDefinition
import com.android.multiuser.widget.data.config.PersistentState
import java.util.Locale
import kotlinx.coroutines.flow.MutableStateFlow

import kotlinx.coroutines.launch

class MultiuserWidget : GlanceAppWidget() {
  override val stateDefinition = PreferencesGlanceStateDefinition
  override val sizeMode = SizeMode.Exact

  override suspend fun provideGlance(context: Context, id: GlanceId) {
    val userManager = MultiuserWidgetUtil.getUserManager(context)
    val activityManager = MultiuserWidgetUtil.getActivityManager(context)

    provideContent {
    val widgetCategory = LocalAppWidgetOptions.current
      .getInt(AppWidgetManager.OPTION_APPWIDGET_HOST_CATEGORY)
      val useCase: ILoadUsersUseCase = LoadCurrentUserUseCase(
        UsersRepository(userManager, activityManager, context.contentResolver),
        ActionsRepository(context.resources),
        ImageRepository(userManager, context.resources),
        widgetCategory
      )
      GlanceTheme(colors = SystemUiColorProviders) { Content(UsersViewModel(useCase)) }
    }
  }

  @Composable
  private fun Content(viewModel: UsersViewModel) {
    val uiState by viewModel.uiState.collectAsState()
    val scope = rememberCoroutineScope()
    // Preference change will trigger new job schedule
    val prefs = currentState<Preferences>()

    when (uiState) {
      is UiState.Invalid -> scope.launch { viewModel.reload() }
      is UiState.Loading -> LoadingLayout()
      is UiState.Success -> {
        LayoutView(viewModel)
        SettingsGlobalJob.scheduleJob(LocalContext.current)
      }
      else -> {
        ErrorLayout()
      }
    }
  }
}