/*
 * 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.healthconnect.controller.data.entriesandaccess

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.View.GONE
import android.view.View.VISIBLE
import android.view.ViewGroup
import androidx.core.os.bundleOf
import androidx.fragment.app.Fragment
import androidx.fragment.app.commitNow
import androidx.fragment.app.viewModels
import androidx.viewpager2.adapter.FragmentStateAdapter
import androidx.viewpager2.widget.ViewPager2
import com.android.healthconnect.controller.R
import com.android.healthconnect.controller.data.access.AccessFragment
import com.android.healthconnect.controller.data.appdata.AppDataFragment.Companion.PERMISSION_TYPE_NAME_KEY
import com.android.healthconnect.controller.data.entries.AllEntriesFragment
import com.android.healthconnect.controller.data.entries.EntriesViewModel
import com.android.healthconnect.controller.data.entries.EntriesViewModel.EntriesDeletionScreenState.DELETE
import com.android.healthconnect.controller.data.entries.EntriesViewModel.EntriesDeletionScreenState.VIEW
import com.android.healthconnect.controller.permissions.data.HealthPermissionType
import com.android.healthconnect.controller.permissions.data.fromPermissionTypeName
import com.android.healthconnect.controller.selectabledeletion.DeletionConstants.START_DELETION_KEY
import com.android.healthconnect.controller.selectabledeletion.DeletionFragment
import com.android.healthconnect.controller.utils.logging.HealthConnectLogger
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator
import dagger.hilt.android.AndroidEntryPoint
import javax.inject.Inject

/** Fragment with [AllEntriesFragment] tab and [AccessFragment] tab. */
@AndroidEntryPoint(Fragment::class)
class EntriesAndAccessFragment : Hilt_EntriesAndAccessFragment() {

    companion object {
        private const val DELETION_TAG = "DeletionTag"
        private const val START_DELETION_ENTRIES_AND_ACCESS_KEY =
            "START_DELETION_ENTRIES_AND_ACCESS_KEY"
    }

    @Inject lateinit var logger: HealthConnectLogger

    private lateinit var permissionType: HealthPermissionType
    private lateinit var viewPager: ViewPager2
    private lateinit var tabLayout: TabLayout
    private lateinit var tabLayoutDisabled: TabLayout
    private val entriesViewModel: EntriesViewModel by viewModels()

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?,
    ): View? {
        childFragmentManager.setFragmentResultListener(
            START_DELETION_ENTRIES_AND_ACCESS_KEY,
            this,
        ) { _, _ ->
            childFragmentManager.setFragmentResult(START_DELETION_KEY, bundleOf())
        }
        if (requireArguments().containsKey(PERMISSION_TYPE_NAME_KEY)) {
            val permissionTypeName =
                arguments?.getString(PERMISSION_TYPE_NAME_KEY)
                    ?: throw IllegalArgumentException("PERMISSION_TYPE_NAME_KEY can't be null!")
            permissionType = fromPermissionTypeName(permissionTypeName)
        }
        return inflater.inflate(R.layout.fragment_entries_access, container, false)
    }

    override fun onResume() {
        super.onResume()
        entriesViewModel.shouldReloadEntries = true
        if (childFragmentManager.findFragmentByTag(DELETION_TAG) == null) {
            childFragmentManager.commitNow { add(DeletionFragment(), DELETION_TAG) }
        }
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        viewPager = view.findViewById(R.id.view_pager)
        viewPager.adapter = ViewPagerAdapter(this, permissionType)
        tabLayout = view.findViewById(R.id.tab_layout)
        tabLayoutDisabled = view.findViewById(R.id.tab_layout_disabled)

        entriesViewModel.screenState.observe(viewLifecycleOwner) { screenState ->
            when (screenState) {
                DELETE -> {
                    tabLayoutMediator(tabLayoutDisabled, isDeletionState = true)
                    tabLayout.visibility = GONE
                    tabLayoutDisabled.visibility = VISIBLE
                    viewPager.isUserInputEnabled = false
                }
                VIEW -> {
                    tabLayoutMediator(tabLayout, isDeletionState = false)
                    tabLayout.visibility = VISIBLE
                    tabLayoutDisabled.visibility = GONE
                    viewPager.isUserInputEnabled = true
                }
                else -> {
                    // do nothing
                }
            }
        }

        entriesViewModel.isLoadingDateNavigation.observe(viewLifecycleOwner) { isLoading ->
            val entriesTab = tabLayout.getTabAt(0)
            if (isLoading) {
                entriesTab?.view?.importantForAccessibility =
                    View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
            } else {
                view.post {
                    entriesTab?.view?.importantForAccessibility =
                        View.IMPORTANT_FOR_ACCESSIBILITY_AUTO
                }
            }
        }
    }

    private fun tabLayoutMediator(tabLayout: TabLayout, isDeletionState: Boolean) {
        TabLayoutMediator(tabLayout, viewPager) { tab, position ->
                if (position == 0) {
                    tab.text = getString(R.string.tab_entries)
                } else {
                    tab.text = getString(R.string.tab_access)
                }
                tab.view.isEnabled = !isDeletionState
            }
            .attach()
    }

    class ViewPagerAdapter(
        fragment: EntriesAndAccessFragment,
        private val permissionType: HealthPermissionType,
    ) : FragmentStateAdapter(fragment) {

        override fun getItemCount(): Int = 2

        override fun createFragment(position: Int): Fragment {
            val fragment: Fragment = if (position == 0) AllEntriesFragment() else AccessFragment()
            fragment.arguments = bundleOf(PERMISSION_TYPE_NAME_KEY to permissionType.name)
            return fragment
        }
    }
}