/**
 * Copyright (C) 2022 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.permissions.connectedapps.searchapps

import android.content.Intent.EXTRA_PACKAGE_NAME
import android.os.Bundle
import android.view.Menu
import android.view.MenuInflater
import android.view.MenuItem
import android.view.View
import android.widget.SearchView
import androidx.core.os.bundleOf
import androidx.core.view.MenuHost
import androidx.core.view.MenuProvider
import androidx.fragment.app.activityViewModels
import androidx.fragment.app.commitNow
import androidx.lifecycle.Lifecycle
import androidx.navigation.fragment.findNavController
import androidx.preference.Preference
import androidx.preference.PreferenceGroup
import com.android.healthconnect.controller.R
import com.android.healthconnect.controller.permissions.connectedapps.ConnectedAppsViewModel
import com.android.healthconnect.controller.permissions.connectedapps.HealthAppPreference
import com.android.healthconnect.controller.selectabledeletion.DeletionConstants.START_DELETION_KEY
import com.android.healthconnect.controller.selectabledeletion.DeletionFragment
import com.android.healthconnect.controller.selectabledeletion.DeletionType.DeleteAppData
import com.android.healthconnect.controller.selectabledeletion.DeletionViewModel
import com.android.healthconnect.controller.shared.Constants.EXTRA_APP_NAME
import com.android.healthconnect.controller.shared.app.AppPermissionsType
import com.android.healthconnect.controller.shared.app.ConnectedAppMetadata
import com.android.healthconnect.controller.shared.app.ConnectedAppStatus.ALLOWED
import com.android.healthconnect.controller.shared.app.ConnectedAppStatus.DENIED
import com.android.healthconnect.controller.shared.app.ConnectedAppStatus.INACTIVE
import com.android.healthconnect.controller.shared.inactiveapp.InactiveAppPreference
import com.android.healthconnect.controller.shared.preference.HealthPreferenceFragment
import com.android.healthconnect.controller.utils.logging.AppPermissionsElement
import com.android.healthconnect.controller.utils.logging.HealthConnectLogger
import com.android.healthconnect.controller.utils.logging.PageName
import com.android.healthconnect.controller.utils.pref
import com.android.settingslib.widget.SettingsThemeHelper
import com.android.settingslib.widget.TopIntroPreference
import com.android.settingslib.widget.ZeroStatePreference
import com.google.android.material.appbar.AppBarLayout
import dagger.hilt.android.AndroidEntryPoint
import javax.inject.Inject
import kotlin.getValue

/** Fragment for search apps screen. */
@AndroidEntryPoint(HealthPreferenceFragment::class)
class SearchAppsFragment : Hilt_SearchAppsFragment() {

    companion object {
        const val ALLOWED_APPS_CATEGORY = "allowed_apps"
        private const val NOT_ALLOWED_APPS = "not_allowed_apps"
        private const val INACTIVE_APPS = "inactive_apps"
        private const val EMPTY_SEARCH_RESULT = "no_search_result_preference"
        private const val TOP_INTRO_PREF = "search_apps_top_intro"
        private const val ZERO_STATE_PREF = "no_result"
        private const val FRAGMENT_TAG_DELETION = "FRAGMENT_TAG_DELETION"
    }

    @Inject lateinit var logger: HealthConnectLogger

    private var searchView: SearchView? = null
    private val viewModel: ConnectedAppsViewModel by activityViewModels()
    private val deletionViewModel: DeletionViewModel by activityViewModels()

    private val allowedAppsCategory: PreferenceGroup by pref(ALLOWED_APPS_CATEGORY)

    private val notAllowedAppsCategory: PreferenceGroup by pref(NOT_ALLOWED_APPS)

    private val inactiveAppsPreference: PreferenceGroup by pref(INACTIVE_APPS)

    private val emptySearchResultsPreference: NoSearchResultPreference by pref(EMPTY_SEARCH_RESULT)

    private val topIntroPreference: TopIntroPreference by pref(TOP_INTRO_PREF)
    private val zeroStatePreference: ZeroStatePreference by pref(ZERO_STATE_PREF)

    private val menuProvider =
        object : MenuProvider, SearchView.OnQueryTextListener {
            override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
                menuInflater.inflate(R.menu.search_apps, menu)
                val searchMenuItem = menu.findItem(R.id.menu_search_apps)
                searchMenuItem.expandActionView()
                searchMenuItem.setOnActionExpandListener(
                    object : MenuItem.OnActionExpandListener {

                        override fun onMenuItemActionExpand(item: MenuItem): Boolean {
                            return true
                        }

                        override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
                            showTitleFromCollapsingToolbarLayout()
                            findNavController().popBackStack()
                            return true
                        }
                    }
                )
                searchView = searchMenuItem.actionView as SearchView
                searchView!!.queryHint = getText(R.string.search_connected_apps)
                searchView!!.setOnQueryTextListener(this)
                searchView!!.maxWidth = Int.MAX_VALUE
            }

            override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
                return false
            }

            override fun onQueryTextSubmit(p0: String?): Boolean {
                return false
            }

            override fun onQueryTextChange(newText: String): Boolean {
                viewModel.searchConnectedApps(newText)
                return true
            }
        }

    init {
        this.setPageName(PageName.SEARCH_APPS_PAGE)
    }

    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        setPreferencesFromResource(R.xml.search_apps_screen, rootKey)
        preferenceScreen.addPreference(NoSearchResultPreference(requireContext()))

        if (childFragmentManager.findFragmentByTag(FRAGMENT_TAG_DELETION) == null) {
            childFragmentManager.commitNow { add(DeletionFragment(), FRAGMENT_TAG_DELETION) }
        }
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        setupMenu()
        hideTitleFromCollapsingToolbarLayout()
        viewModel.connectedApps.observe(viewLifecycleOwner) { connectedApps ->
            updateEmptySearchResultsPreference(connectedApps)
            topIntroPreference.isVisible = connectedApps.isNotEmpty()

            val connectedAppsGroup = connectedApps.groupBy { it.status }
            updateAllowedApps(connectedAppsGroup[ALLOWED].orEmpty())
            updateDeniedApps(connectedAppsGroup[DENIED].orEmpty())
            updateInactiveApps(connectedAppsGroup[INACTIVE].orEmpty())
        }

        deletionViewModel.connectedAppsReloadNeeded.observe(viewLifecycleOwner) { isReloadNeeded ->
            if (isReloadNeeded) {
                viewModel.loadConnectedApps()
                deletionViewModel.resetConnectedAppsReloadNeeded()
            }
        }
    }

    private fun updateEmptySearchResultsPreference(connectedApps: List<ConnectedAppMetadata>) {
        if (SettingsThemeHelper.isExpressiveTheme(requireContext())) {
            zeroStatePreference.isVisible = connectedApps.isEmpty()
            emptySearchResultsPreference.isVisible = false
        } else {
            zeroStatePreference.isVisible = false
            emptySearchResultsPreference.isVisible = connectedApps.isEmpty()
            emptySearchResultsPreference.isSelectable = false
        }
    }

    override fun onDestroyView() {
        super.onDestroyView()
        showTitleFromCollapsingToolbarLayout()
    }

    override fun onResume() {
        super.onResume()
        viewModel.loadConnectedApps()
        hideTitleFromCollapsingToolbarLayout()
    }

    private fun updateInactiveApps(appsList: List<ConnectedAppMetadata>) {
        inactiveAppsPreference.removeAll()
        if (appsList.isEmpty()) {
            preferenceScreen.removePreference(inactiveAppsPreference)
        } else {
            preferenceScreen.addPreference(inactiveAppsPreference)
            appsList
                .sortedBy { it.appMetadata.appName }
                .forEach { app ->
                    val inactiveAppPreference =
                        InactiveAppPreference(requireContext()).also {
                            it.title = app.appMetadata.appName
                            it.icon = app.appMetadata.icon
                            it.logName = AppPermissionsElement.INACTIVE_APP_BUTTON
                            it.setOnDeleteButtonClickListener {
                                val packageName = app.appMetadata.packageName
                                val appName = app.appMetadata.appName
                                deleteData(packageName, appName)
                            }
                        }
                    inactiveAppsPreference.addPreference(inactiveAppPreference)
                }
        }
    }

    private fun deleteData(packageName: String, appName: String) {
        deletionViewModel.setDeletionType(DeleteAppData(packageName, appName))
        childFragmentManager.setFragmentResult(START_DELETION_KEY, bundleOf())
    }

    private fun updateAllowedApps(appsList: List<ConnectedAppMetadata>) {
        allowedAppsCategory.removeAll()
        if (appsList.isEmpty()) {
            preferenceScreen.removePreference(allowedAppsCategory)
        } else {
            preferenceScreen.addPreference(allowedAppsCategory)
            appsList
                .sortedBy { it.appMetadata.appName }
                .forEach { app ->
                    allowedAppsCategory.addPreference(
                        getAppPreference(app) { navigateToAppInfoScreen(app) }
                    )
                }
        }
    }

    private fun updateDeniedApps(appsList: List<ConnectedAppMetadata>) {
        notAllowedAppsCategory.removeAll()
        if (appsList.isEmpty()) {
            preferenceScreen.removePreference(notAllowedAppsCategory)
        } else {
            preferenceScreen.addPreference(notAllowedAppsCategory)
            appsList
                .sortedBy { it.appMetadata.appName }
                .forEach { app ->
                    notAllowedAppsCategory.addPreference(
                        getAppPreference(app) { navigateToAppInfoScreen(app) }
                    )
                }
        }
    }

    private fun navigateToAppInfoScreen(app: ConnectedAppMetadata) {
        val navigationId =
            when (app.permissionsType) {
                AppPermissionsType.FITNESS_PERMISSIONS_ONLY -> R.id.action_searchApps_to_fitnessApp
                AppPermissionsType.MEDICAL_PERMISSIONS_ONLY -> R.id.action_searchApps_to_medicalApp
                AppPermissionsType.COMBINED_PERMISSIONS ->
                    R.id.action_searchApps_to_combinedPermissions
            }
        findNavController()
            .navigate(
                navigationId,
                bundleOf(
                    EXTRA_PACKAGE_NAME to app.appMetadata.packageName,
                    EXTRA_APP_NAME to app.appMetadata.appName,
                ),
            )
    }

    private fun getAppPreference(
        app: ConnectedAppMetadata,
        onClick: (() -> Unit)? = null,
    ): Preference {
        return HealthAppPreference(requireContext(), app.appMetadata).also {
            if (app.status == ALLOWED) {
                it.logName = AppPermissionsElement.CONNECTED_APP_BUTTON
            } else if (app.status == DENIED) {
                it.logName = AppPermissionsElement.NOT_CONNECTED_APP_BUTTON
            } else if (app.status == INACTIVE) {
                it.logName = AppPermissionsElement.INACTIVE_APP_BUTTON
            }
            it.setOnPreferenceClickListener {
                onClick?.invoke()
                true
            }
        }
    }

    private fun setupMenu() {
        (activity as MenuHost).addMenuProvider(
            menuProvider,
            viewLifecycleOwner,
            Lifecycle.State.RESUMED,
        )
    }

    private fun hideTitleFromCollapsingToolbarLayout() {
        activity
            ?.findViewById<AppBarLayout>(com.android.settingslib.collapsingtoolbar.R.id.app_bar)
            ?.setExpanded(false)
    }

    private fun showTitleFromCollapsingToolbarLayout() {
        activity
            ?.findViewById<AppBarLayout>(com.android.settingslib.collapsingtoolbar.R.id.app_bar)
            ?.setExpanded(true)
    }
}