/*
 * Copyright (C) 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
 *
 *      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.wallpaper.customization.ui.binder

import android.app.Dialog
import android.content.Context
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import androidx.core.graphics.drawable.DrawableCompat
import androidx.core.view.get
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.lifecycleScope
import androidx.lifecycle.repeatOnLifecycle
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.android.customization.picker.common.ui.view.DoubleRowListItemSpacing
import com.android.themepicker.R
import com.android.wallpaper.customization.ui.util.ThemePickerCustomizationOptionUtil.ThemePickerLockCustomizationOption.SHORTCUTS
import com.android.wallpaper.customization.ui.viewmodel.ThemePickerCustomizationOptionsViewModel
import com.android.wallpaper.picker.common.dialog.ui.viewbinder.DialogViewBinder
import com.android.wallpaper.picker.common.dialog.ui.viewmodel.DialogViewModel
import com.android.wallpaper.picker.common.icon.ui.viewbinder.IconViewBinder
import com.android.wallpaper.picker.common.icon.ui.viewmodel.Icon
import com.android.wallpaper.picker.customization.ui.binder.ColorUpdateBinder
import com.android.wallpaper.picker.customization.ui.view.FloatingToolbar
import com.android.wallpaper.picker.customization.ui.view.adapter.FloatingToolbarTabAdapter
import com.android.wallpaper.picker.customization.ui.viewmodel.ColorUpdateViewModel
import com.android.wallpaper.picker.option.ui.adapter.OptionItemAdapter2
import java.lang.ref.WeakReference
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.flow.collectIndexed
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.flow.flatMapLatest
import kotlinx.coroutines.launch

@OptIn(ExperimentalCoroutinesApi::class)
object ShortcutFloatingSheetBinder {

    fun bind(
        view: View,
        optionsViewModel: ThemePickerCustomizationOptionsViewModel,
        colorUpdateViewModel: ColorUpdateViewModel,
        lifecycleOwner: LifecycleOwner,
    ) {
        val viewModel = optionsViewModel.keyguardQuickAffordancePickerViewModel2
        val isFloatingSheetActive = { optionsViewModel.selectedOption.value == SHORTCUTS }

        val tabs = view.requireViewById<FloatingToolbar>(R.id.floating_toolbar)
        val tabContainer =
            tabs.findViewById<ViewGroup>(com.android.wallpaper.R.id.floating_toolbar_tab_container)
        ColorUpdateBinder.bind(
            setColor = { color ->
                DrawableCompat.setTint(DrawableCompat.wrap(tabContainer.background), color)
            },
            color = colorUpdateViewModel.floatingToolbarBackground,
            shouldAnimate = isFloatingSheetActive,
            lifecycleOwner = lifecycleOwner,
        )
        val tabAdapter =
            FloatingToolbarTabAdapter(
                    colorUpdateViewModel = WeakReference(colorUpdateViewModel),
                    shouldAnimateColor = isFloatingSheetActive,
                )
                .also { tabs.setAdapter(it) }

        val floatingSheetContainer =
            view.requireViewById<ViewGroup>(R.id.floating_sheet_content_container)
        ColorUpdateBinder.bind(
            setColor = { color ->
                DrawableCompat.setTint(
                    DrawableCompat.wrap(floatingSheetContainer.background),
                    color,
                )
            },
            color = colorUpdateViewModel.colorSurfaceBright,
            shouldAnimate = isFloatingSheetActive,
            lifecycleOwner = lifecycleOwner,
        )

        val quickAffordanceAdapter =
            createOptionItemAdapter(
                colorUpdateViewModel = colorUpdateViewModel,
                shouldAnimateColor = isFloatingSheetActive,
                lifecycleOwner = lifecycleOwner,
            )
        val quickAffordanceList =
            view.requireViewById<RecyclerView>(R.id.quick_affordance_horizontal_list).also {
                it.initQuickAffordanceList(view.context.applicationContext, quickAffordanceAdapter)
            }

        var dialog: Dialog? = null

        lifecycleOwner.lifecycleScope.launch {
            lifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
                launch { viewModel.tabs.collect { tabAdapter.submitList(it) } }

                launch {
                    viewModel.quickAffordances.collect { affordances ->
                        quickAffordanceAdapter.setItems(affordances)
                    }
                }

                launch {
                    viewModel.selectedQuickAffordanceIndex.collect { index ->
                        quickAffordanceList.post {
                            val layoutManager =
                                quickAffordanceList.layoutManager as? LinearLayoutManager
                                    ?: return@post
                            val itemView = layoutManager.findViewByPosition(index)

                            if (itemView != null) {
                                val parentCenter = quickAffordanceList.width / 2
                                val itemCenter = itemView.left + itemView.width / 2
                                val scrollBy = itemCenter - parentCenter
                                quickAffordanceList.smoothScrollBy(scrollBy, 0)
                            }
                        }
                    }
                }

                launch {
                    viewModel.quickAffordances
                        .flatMapLatest { affordances ->
                            combine(affordances.map { affordance -> affordance.isSelected }) {
                                selectedFlags ->
                                selectedFlags.indexOfFirst { it }
                            }
                        }
                        .collectIndexed { index, selectedPosition ->
                            // Scroll the view to show the first selected affordance.
                            if (selectedPosition != -1) {
                                // We use "post" because we need to give the adapter item a pass to
                                // update the view.
                                quickAffordanceList.post {
                                    if (index == 0) {
                                        // don't animate on initial collection
                                        quickAffordanceList.scrollToPosition(selectedPosition)
                                    } else {
                                        quickAffordanceList.smoothScrollToPosition(selectedPosition)
                                    }
                                }
                            }
                        }
                }

                launch {
                    viewModel.dialog.distinctUntilChanged().collect { dialogRequest ->
                        dialog?.dismiss()
                        dialog =
                            if (dialogRequest != null) {
                                showDialog(
                                    context = view.context,
                                    request = dialogRequest,
                                    onDismissed = viewModel::onDialogDismissed,
                                )
                            } else {
                                null
                            }
                    }
                }

                launch {
                    viewModel.activityStartRequests.collect { intent ->
                        if (intent != null) {
                            view.context.startActivity(intent)
                            viewModel.onActivityStarted()
                        }
                    }
                }
            }
        }
    }

    private fun showDialog(
        context: Context,
        request: DialogViewModel,
        onDismissed: () -> Unit,
    ): Dialog {
        return DialogViewBinder.show(
            context = context,
            viewModel = request,
            onDismissed = onDismissed,
        )
    }

    private fun createOptionItemAdapter(
        colorUpdateViewModel: ColorUpdateViewModel,
        shouldAnimateColor: () -> Boolean,
        lifecycleOwner: LifecycleOwner,
    ): OptionItemAdapter2<Icon> =
        OptionItemAdapter2(
            layoutResourceId = R.layout.quick_affordance_list_item2,
            lifecycleOwner = lifecycleOwner,
            bindPayload = { itemView: View, gridIcon: Icon ->
                val imageView =
                    itemView.requireViewById<ImageView>(com.android.wallpaper.R.id.foreground)
                IconViewBinder.bind(imageView, gridIcon)
                // Return null since it does not need the lifecycleOwner to launch any job for later
                // disposal when rebind.
                return@OptionItemAdapter2 null
            },
            colorUpdateViewModel = WeakReference(colorUpdateViewModel),
            shouldAnimateColor = shouldAnimateColor,
        )

    private fun RecyclerView.initQuickAffordanceList(
        context: Context,
        adapter: OptionItemAdapter2<Icon>,
    ) {
        apply {
            this.adapter = adapter
            layoutManager = GridLayoutManager(context, 2, GridLayoutManager.HORIZONTAL, false)
            addItemDecoration(
                DoubleRowListItemSpacing(
                    edgeItemSpacePx =
                        context.resources.getDimensionPixelSize(
                            R.dimen.floating_sheet_content_horizontal_padding
                        ),
                    itemHorizontalSpacePx =
                        context.resources.getDimensionPixelSize(
                            R.dimen.floating_sheet_shortcut_list_item_horizontal_space
                        ),
                    itemVerticalSpacePx =
                        context.resources.getDimensionPixelSize(
                            R.dimen.floating_sheet_list_item_vertical_space
                        ),
                )
            )
        }
    }
}