/*
 * 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.wallpaper.picker.preview.ui.binder

import android.annotation.SuppressLint
import android.content.Context
import android.graphics.Point
import android.view.View
import androidx.core.view.doOnPreDraw
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.lifecycleScope
import androidx.lifecycle.repeatOnLifecycle
import androidx.recyclerview.widget.RecyclerView
import androidx.transition.Transition
import androidx.viewpager2.widget.ViewPager2
import com.android.wallpaper.R
import com.android.wallpaper.model.wallpaper.DeviceDisplayType
import com.android.wallpaper.picker.preview.ui.view.adapters.SinglePreviewPagerAdapter
import com.android.wallpaper.picker.preview.ui.view.pagetransformers.PreviewCardPageTransformer
import com.android.wallpaper.picker.preview.ui.viewmodel.FullPreviewConfigViewModel
import com.android.wallpaper.picker.preview.ui.viewmodel.WallpaperPreviewViewModel
import kotlinx.coroutines.launch

/** Binds single preview home screen and lock screen tabs view pager. */
object PreviewPagerBinder {

    @SuppressLint("WrongConstant")
    fun bind(
        applicationContext: Context,
        viewLifecycleOwner: LifecycleOwner,
        previewsViewPager: ViewPager2,
        wallpaperPreviewViewModel: WallpaperPreviewViewModel,
        previewDisplaySize: Point,
        currentNavDestId: Int,
        transition: Transition?,
        transitionConfig: FullPreviewConfigViewModel?,
        isFirstBinding: Boolean,
        navigate: (View) -> Unit,
    ) {
        previewsViewPager.apply {
            adapter = SinglePreviewPagerAdapter { viewHolder, position ->
                PreviewTooltipBinder.bindSmallPreviewTooltip(
                    tooltipStub = viewHolder.itemView.requireViewById(R.id.tooltip_stub),
                    viewModel = wallpaperPreviewViewModel.smallTooltipViewModel,
                    lifecycleOwner = viewLifecycleOwner,
                )

                SmallPreviewBinder.bind(
                    applicationContext = applicationContext,
                    view = viewHolder.itemView.requireViewById(R.id.preview),
                    viewModel = wallpaperPreviewViewModel,
                    screen = wallpaperPreviewViewModel.smallPreviewTabs[position],
                    displaySize = previewDisplaySize,
                    deviceDisplayType = DeviceDisplayType.SINGLE,
                    viewLifecycleOwner = viewLifecycleOwner,
                    currentNavDestId = currentNavDestId,
                    transition = transition,
                    transitionConfig = transitionConfig,
                    isFirstBinding = isFirstBinding,
                    navigate = navigate,
                )
            }
            offscreenPageLimit = SinglePreviewPagerAdapter.PREVIEW_PAGER_ITEM_COUNT
            setPageTransformer(PreviewCardPageTransformer(previewDisplaySize))
        }

        // the over scroll animation needs to be disabled for the RecyclerView that is contained in
        // the ViewPager2 rather than the ViewPager2 itself
        val child: View = previewsViewPager.getChildAt(0)
        if (child is RecyclerView) {
            child.overScrollMode = View.OVER_SCROLL_NEVER
            // Remove clip children to enable child card view to display fully during scaling shared
            // element transition.
            child.clipChildren = false
        }

        // Wrap in doOnPreDraw for emoji wallpaper creation case, to make sure recycler view with
        // previews have finished layout before calling registerOnPageChangeCallback and
        // setCurrentItem.
        // TODO (b/339679893): investigate to see if there is a better solution
        previewsViewPager.doOnPreDraw {
            previewsViewPager.registerOnPageChangeCallback(
                object : ViewPager2.OnPageChangeCallback() {
                    override fun onPageSelected(position: Int) {
                        super.onPageSelected(position)
                        wallpaperPreviewViewModel.setSmallPreviewSelectedTabIndex(position)
                    }
                }
            )

            viewLifecycleOwner.lifecycleScope.launch {
                viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
                    wallpaperPreviewViewModel.smallPreviewSelectedTabIndex.collect {
                        if (previewsViewPager.currentItem != it) {
                            previewsViewPager.setCurrentItem(it, /* smoothScroll= */ true)
                        }
                    }
                }
            }
        }
    }
}