/*
 * SPDX-License-Identifier: MPL-2.0
 * Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
 */

package emu.skyline.settings

import android.annotation.SuppressLint
import android.os.Bundle
import android.text.TextUtils
import android.view.KeyEvent
import android.view.Menu
import android.view.ViewTreeObserver
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.SearchView
import androidx.coordinatorlayout.widget.CoordinatorLayout
import androidx.core.view.WindowCompat
import androidx.preference.EditTextPreference
import androidx.preference.ListPreference
import androidx.preference.Preference
import androidx.preference.PreferenceCategory
import androidx.preference.PreferenceFragmentCompat
import androidx.preference.forEach
import com.google.android.material.appbar.AppBarLayout
import com.google.android.material.internal.ToolbarUtils
import emu.skyline.BuildConfig
import emu.skyline.R
import emu.skyline.data.AppItemTag
import emu.skyline.databinding.SettingsActivityBinding
import emu.skyline.preference.IntegerListPreference
import emu.skyline.preference.dialog.EditTextPreferenceMaterialDialogFragmentCompat
import emu.skyline.preference.dialog.IntegerListPreferenceMaterialDialogFragmentCompat
import emu.skyline.preference.dialog.ListPreferenceMaterialDialogFragmentCompat
import emu.skyline.utils.WindowInsetsHelper

private const val PREFERENCE_DIALOG_FRAGMENT_TAG = "androidx.preference.PreferenceFragment.DIALOG"

class SettingsActivity : AppCompatActivity(), PreferenceFragmentCompat.OnPreferenceDisplayDialogCallback {
    val binding by lazy { SettingsActivityBinding.inflate(layoutInflater) }
    val hiddenCategoriesFromSearch = if (BuildConfig.BUILD_TYPE == "release") {
        arrayOf("category_debug", "category_credits", "category_licenses")
    } else {
        arrayOf("category_credits", "category_licenses")
    }

    /**
     * The instance of [PreferenceFragmentCompat] that is shown inside [R.id.settings]
     * Retrieves extras from the intent if any and instantiates the appropriate fragment
     */
    private val preferenceFragment by lazy {
        if (intent.hasExtra(AppItemTag))
            GameSettingsFragment().apply { arguments = intent.extras }
        else
            GlobalSettingsFragment()
    }

    /**
     * This initializes all of the elements in the activity and displays the settings fragment
     */
    override fun onCreate(savedInstanceState : Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(binding.root)
        WindowCompat.setDecorFitsSystemWindows(window, false)
        WindowInsetsHelper.applyToActivity(binding.root)

        setSupportActionBar(binding.titlebar.toolbar)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)

        var layoutDone = false // Tracks if the layout is complete to avoid retrieving invalid attributes
        binding.coordinatorLayout.viewTreeObserver.addOnTouchModeChangeListener { isTouchMode ->
            val layoutUpdate = {
                val params = binding.settings.layoutParams as CoordinatorLayout.LayoutParams
                if (!isTouchMode) {
                    binding.titlebar.appBarLayout.setExpanded(true)
                    params.height = binding.coordinatorLayout.height - binding.titlebar.toolbar.height
                } else {
                    params.height = CoordinatorLayout.LayoutParams.MATCH_PARENT
                }

                binding.settings.layoutParams = params
                binding.settings.requestLayout()
            }

            if (!layoutDone) {
                binding.coordinatorLayout.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
                    override fun onGlobalLayout() {
                        // We need to wait till the layout is done to get the correct height of the toolbar
                        binding.coordinatorLayout.viewTreeObserver.removeOnGlobalLayoutListener(this)
                        layoutUpdate()
                        layoutDone = true
                    }
                })
            } else {
                layoutUpdate()
            }
        }

        fun enableMarquee(textView : TextView) {
            textView.ellipsize = TextUtils.TruncateAt.MARQUEE
            textView.isSelected = true
            textView.marqueeRepeatLimit = -1
        }

        // Set a temporary subtitle because the retrieval of the subtitle TextView fails if subtitle is null
        supportActionBar?.subtitle = "sub"

        @SuppressLint("RestrictedApi")
        val toolbarTitleTextView = ToolbarUtils.getTitleTextView(binding.titlebar.toolbar)

        @SuppressLint("RestrictedApi")
        val toolbarSubtitleTextView = ToolbarUtils.getSubtitleTextView(binding.titlebar.toolbar)
        toolbarTitleTextView?.let { enableMarquee(it) }
        toolbarSubtitleTextView?.let { enableMarquee(it) }

        // Reset the subtitle to null
        supportActionBar?.subtitle = null

        supportFragmentManager
            .beginTransaction()
            .replace(R.id.settings, preferenceFragment)
            .commit()
    }

    override fun onCreateOptionsMenu(menu : Menu?) : Boolean {
        menuInflater.inflate(R.menu.settings_menu, menu)
        val menuItem = menu!!.findItem(R.id.app_bar_search)
        val searchView = menuItem.actionView as SearchView
        searchView.queryHint = getString(R.string.search)

        searchView.setOnQueryTextFocusChangeListener { _, focus ->
            (binding.titlebar.toolbar.layoutParams as AppBarLayout.LayoutParams).scrollFlags =
                if (focus)
                    AppBarLayout.LayoutParams.SCROLL_FLAG_NO_SCROLL
                else
                    AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
        }

        searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
            override fun onQueryTextSubmit(query : String) : Boolean {
                return false
            }

            override fun onQueryTextChange(newText : String) : Boolean {
                val queries = newText.split(",")
                if (newText.isNotEmpty()) {
                    preferenceFragment.preferenceScreen.forEach { preferenceCategory ->
                        if (hiddenCategoriesFromSearch.contains(preferenceCategory.key)) {
                            preferenceCategory.isVisible = false
                            return@forEach
                        }
                        val queryMatchesCategory = queries.any { preferenceCategory.title?.contains(it, true) ?: false }
                        // Tracks whether all preferences under this category are hidden
                        var areAllPrefsHidden = true
                        (preferenceCategory as PreferenceCategory).forEach { preference ->
                            preference.isVisible = queryMatchesCategory || queries.any { preference.title?.contains(it, true) ?: false }
                            if (preference.isVisible && areAllPrefsHidden)
                                areAllPrefsHidden = false
                        }
                        // Hide PreferenceCategory if none of its preferences match the search and neither the category title
                        preferenceCategory.isVisible = !areAllPrefsHidden || queryMatchesCategory
                    }
                } else { // If user input is empty, show all preferences
                    preferenceFragment.preferenceScreen.forEach { preferenceCategory ->
                        preferenceCategory.isVisible = true
                        (preferenceCategory as PreferenceCategory).forEach { preference ->
                            preference.isVisible = true
                        }
                    }
                }
                return true
            }
        })
        return super.onCreateOptionsMenu(menu)
    }

    /**
     * This handles on calling [onBackPressed] when [KeyEvent.KEYCODE_BUTTON_B] is lifted
     */
    override fun onKeyUp(keyCode : Int, event : KeyEvent?) : Boolean {
        if (keyCode == KeyEvent.KEYCODE_BUTTON_B) {
            onBackPressedDispatcher.onBackPressed()
            return true
        }

        return super.onKeyUp(keyCode, event)
    }

    override fun finish() {
        setResult(RESULT_OK)
        super.finish()
    }

    override fun onPreferenceDisplayDialog(caller : PreferenceFragmentCompat, pref : Preference) : Boolean {
        when (pref) {
            is IntegerListPreference -> {
                // Check if dialog is already showing
                if (supportFragmentManager.findFragmentByTag(PREFERENCE_DIALOG_FRAGMENT_TAG) != null)
                    return true

                val dialogFragment = IntegerListPreferenceMaterialDialogFragmentCompat.newInstance(pref.getKey())
                @Suppress("DEPRECATION")
                dialogFragment.setTargetFragment(caller, 0) // androidx.preference.PreferenceDialogFragmentCompat depends on the target fragment being set correctly even though it's deprecated
                dialogFragment.show(supportFragmentManager, PREFERENCE_DIALOG_FRAGMENT_TAG)
                return true
            }

            is EditTextPreference -> {
                if (supportFragmentManager.findFragmentByTag(PREFERENCE_DIALOG_FRAGMENT_TAG) != null)
                    return true

                val dialogFragment = EditTextPreferenceMaterialDialogFragmentCompat.newInstance(pref.getKey())
                @Suppress("DEPRECATION")
                dialogFragment.setTargetFragment(caller, 0)
                dialogFragment.show(supportFragmentManager, PREFERENCE_DIALOG_FRAGMENT_TAG)
                return true
            }

            is ListPreference -> {
                if (supportFragmentManager.findFragmentByTag(PREFERENCE_DIALOG_FRAGMENT_TAG) != null)
                    return true

                val dialogFragment = ListPreferenceMaterialDialogFragmentCompat.newInstance(pref.getKey())
                @Suppress("DEPRECATION")
                dialogFragment.setTargetFragment(caller, 0)
                dialogFragment.show(supportFragmentManager, PREFERENCE_DIALOG_FRAGMENT_TAG)
                return true
            }

            else -> return false
        }
    }
}