/*
 * 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.grid.ui.fragment

import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.ViewGroup.MarginLayoutParams
import android.widget.Button
import android.widget.Toast
import androidx.core.content.ContextCompat
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import androidx.core.view.isVisible
import androidx.core.view.updateLayoutParams
import androidx.lifecycle.ViewModelProvider
import androidx.transition.Transition
import androidx.transition.doOnStart
import com.android.customization.model.CustomizationManager.Callback
import com.android.customization.module.ThemePickerInjector
import com.android.customization.picker.grid.domain.interactor.GridInteractor
import com.android.customization.picker.grid.ui.binder.GridScreenBinder
import com.android.customization.picker.grid.ui.viewmodel.GridScreenViewModel
import com.android.themepicker.R
import com.android.wallpaper.config.BaseFlags
import com.android.wallpaper.model.Screen
import com.android.wallpaper.module.CurrentWallpaperInfoFactory
import com.android.wallpaper.module.InjectorProvider
import com.android.wallpaper.picker.AppbarFragment
import com.android.wallpaper.picker.customization.domain.interactor.WallpaperInteractor
import com.android.wallpaper.picker.customization.ui.binder.ScreenPreviewBinder
import com.android.wallpaper.picker.customization.ui.viewmodel.ScreenPreviewViewModel
import com.android.wallpaper.util.PreviewUtils
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.suspendCancellableCoroutine

private val TAG = GridFragment::class.java.simpleName

@OptIn(ExperimentalCoroutinesApi::class)
class GridFragment : AppbarFragment() {

    private lateinit var gridInteractor: GridInteractor

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?,
    ): View {
        val view = inflater.inflate(R.layout.fragment_grid, container, false)
        ViewCompat.setOnApplyWindowInsetsListener(view) { v, windowInsets ->
            val insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
            v.updateLayoutParams<MarginLayoutParams> {
                topMargin = insets.top
                bottomMargin = insets.bottom
            }
            WindowInsetsCompat.CONSUMED
        }
        setUpToolbar(view)

        val isGridApplyButtonEnabled = BaseFlags.get().isGridApplyButtonEnabled(requireContext())

        val injector = InjectorProvider.getInjector() as ThemePickerInjector

        val wallpaperInfoFactory = injector.getCurrentWallpaperInfoFactory(requireContext())
        var screenPreviewBinding =
            bindScreenPreview(
                view,
                wallpaperInfoFactory,
                injector.getWallpaperInteractor(requireContext()),
                injector.getGridInteractor(requireContext()),
            )

        val viewModelFactory = injector.getGridScreenViewModelFactory(requireContext())
        gridInteractor = injector.getGridInteractor(requireContext())
        GridScreenBinder.bind(
            view = view,
            viewModel = ViewModelProvider(this, viewModelFactory)[GridScreenViewModel::class.java],
            lifecycleOwner = this,
            backgroundDispatcher = Dispatchers.IO,
            onOptionsChanged = {
                screenPreviewBinding.destroy()
                screenPreviewBinding =
                    bindScreenPreview(
                        view,
                        wallpaperInfoFactory,
                        injector.getWallpaperInteractor(requireContext()),
                        gridInteractor,
                    )
                if (isGridApplyButtonEnabled) {
                    val applyButton: Button = view.requireViewById(R.id.apply_button)
                    applyButton.isEnabled = !gridInteractor.isSelectedOptionApplied()
                }
            },
            isGridApplyButtonEnabled = isGridApplyButtonEnabled,
            onOptionApplied = {
                gridInteractor.applySelectedOption(
                    object : Callback {
                        override fun onSuccess() {
                            Toast.makeText(
                                    context,
                                    getString(
                                        R.string.toast_of_changing_grid,
                                        gridInteractor.getSelectOptionStateFlow().value?.title,
                                    ),
                                    Toast.LENGTH_SHORT,
                                )
                                .show()
                            val applyButton: Button = view.requireViewById(R.id.apply_button)
                            applyButton.isEnabled = false
                        }

                        override fun onError(throwable: Throwable?) {
                            val errorMsg =
                                getString(
                                    R.string.toast_of_failure_to_change_grid,
                                    gridInteractor.getSelectOptionStateFlow().value?.title,
                                )
                            Toast.makeText(context, errorMsg, Toast.LENGTH_SHORT).show()
                            Log.e(TAG, errorMsg, throwable)
                        }
                    }
                )
            },
        )

        (returnTransition as? Transition)?.doOnStart {
            view.requireViewById<View>(R.id.preview).isVisible = false
        }

        return view
    }

    override fun getDefaultTitle(): CharSequence {
        return getString(R.string.grid_title)
    }

    override fun getToolbarTextColor(): Int {
        return ContextCompat.getColor(
            requireContext(),
            com.android.wallpaper.R.color.system_on_surface,
        )
    }

    private fun bindScreenPreview(
        view: View,
        wallpaperInfoFactory: CurrentWallpaperInfoFactory,
        wallpaperInteractor: WallpaperInteractor,
        gridInteractor: GridInteractor,
    ): ScreenPreviewBinder.Binding {
        return ScreenPreviewBinder.bind(
            activity = requireActivity(),
            previewView = view.requireViewById(R.id.preview),
            viewModel =
                ScreenPreviewViewModel(
                    previewUtils =
                        PreviewUtils(
                            context = requireContext(),
                            authorityMetadataKey =
                                requireContext()
                                    .getString(
                                        com.android.wallpaper.R.string.grid_control_metadata_name
                                    ),
                            screen = Screen.HOME_SCREEN,
                        ),
                    initialExtrasProvider = {
                        val bundle = Bundle()
                        bundle.putString(
                            "name",
                            gridInteractor.getSelectOptionStateFlow().value?.name,
                        )
                        bundle
                    },
                    wallpaperInfoProvider = {
                        suspendCancellableCoroutine { continuation ->
                            wallpaperInfoFactory.createCurrentWallpaperInfos(
                                context,
                                /* forceRefresh= */ true,
                            ) { homeWallpaper, lockWallpaper, _ ->
                                continuation.resume(homeWallpaper ?: lockWallpaper, null)
                            }
                        }
                    },
                    wallpaperInteractor = wallpaperInteractor,
                    screen = Screen.HOME_SCREEN,
                ),
            lifecycleOwner = viewLifecycleOwner,
            offsetToStart = false,
            onWallpaperPreviewDirty = { activity?.recreate() },
        )
    }

    override fun onBackPressed(): Boolean {
        if (BaseFlags.get().isGridApplyButtonEnabled(requireContext())) {
            gridInteractor.clearSelectedOption()
        }
        return super.onBackPressed()
    }
}