/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.fenix.settings

import android.annotation.SuppressLint
import android.os.Build
import android.os.Build.VERSION.SDK_INT
import android.os.Bundle
import androidx.appcompat.app.AppCompatDelegate
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
import androidx.preference.SwitchPreference
import org.mozilla.fenix.FeatureFlags
import org.mozilla.fenix.GleanMetrics.AppTheme
import org.mozilla.fenix.GleanMetrics.PullToRefreshInBrowser
import org.mozilla.fenix.GleanMetrics.ToolbarSettings
import org.mozilla.fenix.R
import org.mozilla.fenix.components.toolbar.ToolbarPosition
import org.mozilla.fenix.ext.requireComponents
import org.mozilla.fenix.ext.settings
import org.mozilla.fenix.ext.showToolbar
import org.mozilla.fenix.utils.view.addToRadioGroup

/**
 * Lets the user customize the UI.
 */

@Suppress("TooManyFunctions")
class CustomizationFragment : PreferenceFragmentCompat() {
    private lateinit var radioLightTheme: RadioButtonPreference
    private lateinit var radioDarkTheme: RadioButtonPreference
    private lateinit var radioAutoBatteryTheme: RadioButtonPreference
    private lateinit var radioFollowDeviceTheme: RadioButtonPreference

    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        setPreferencesFromResource(R.xml.customization_preferences, rootKey)

        setupPreferences()
    }

    override fun onResume() {
        super.onResume()
        showToolbar(getString(R.string.preferences_customize))
    }

    private fun setupPreferences() {
        bindFollowDeviceTheme()
        bindDarkTheme()
        bindLightTheme()
        bindAutoBatteryTheme()
        setupRadioGroups()
        setupToolbarCategory()
        setupGesturesCategory()
    }

    private fun setupRadioGroups() {
        addToRadioGroup(
            radioLightTheme,
            radioDarkTheme,
            if (SDK_INT >= Build.VERSION_CODES.P) {
                radioFollowDeviceTheme
            } else {
                radioAutoBatteryTheme
            },
        )
    }

    private fun bindLightTheme() {
        radioLightTheme = requirePreference(R.string.pref_key_light_theme)
        radioLightTheme.onClickListener {
            setNewTheme(AppCompatDelegate.MODE_NIGHT_NO)
        }
    }

    @SuppressLint("WrongConstant")
    // Suppressing erroneous lint warning about using MODE_NIGHT_AUTO_BATTERY, a likely library bug
    private fun bindAutoBatteryTheme() {
        radioAutoBatteryTheme = requirePreference(R.string.pref_key_auto_battery_theme)
        radioAutoBatteryTheme.onClickListener {
            setNewTheme(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY)
        }
    }

    private fun bindDarkTheme() {
        radioDarkTheme = requirePreference(R.string.pref_key_dark_theme)
        radioDarkTheme.onClickListener {
            AppTheme.darkThemeSelected.record(
                AppTheme.DarkThemeSelectedExtra(
                    "SETTINGS",
                ),
            )
            setNewTheme(AppCompatDelegate.MODE_NIGHT_YES)
        }
    }

    private fun bindFollowDeviceTheme() {
        radioFollowDeviceTheme = requirePreference(R.string.pref_key_follow_device_theme)
        if (SDK_INT >= Build.VERSION_CODES.P) {
            radioFollowDeviceTheme.onClickListener {
                setNewTheme(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
            }
        }
    }

    private fun setNewTheme(mode: Int) {
        if (AppCompatDelegate.getDefaultNightMode() == mode) return
        AppCompatDelegate.setDefaultNightMode(mode)
        activity?.recreate()
        with(requireComponents.core) {
            engine.settings.preferredColorScheme = getPreferredColorScheme()
        }
        requireComponents.useCases.sessionUseCases.reload.invoke()
    }

    private fun setupToolbarCategory() {
        val topPreference = requirePreference<RadioButtonPreference>(R.string.pref_key_toolbar_top)
        topPreference.onClickListener {
            ToolbarSettings.changedPosition.record(
                ToolbarSettings.ChangedPositionExtra(
                    Position.TOP.name,
                ),
            )
        }

        val bottomPreference = requirePreference<RadioButtonPreference>(R.string.pref_key_toolbar_bottom)
        bottomPreference.onClickListener {
            ToolbarSettings.changedPosition.record(
                ToolbarSettings.ChangedPositionExtra(
                    Position.BOTTOM.name,
                ),
            )
        }

        val toolbarPosition = requireContext().settings().toolbarPosition
        topPreference.setCheckedWithoutClickListener(toolbarPosition == ToolbarPosition.TOP)
        bottomPreference.setCheckedWithoutClickListener(toolbarPosition == ToolbarPosition.BOTTOM)

        addToRadioGroup(topPreference, bottomPreference)
    }

    private fun setupGesturesCategory() {
        requirePreference<SwitchPreference>(R.string.pref_key_website_pull_to_refresh).apply {
            isVisible = FeatureFlags.pullToRefreshEnabled
            isChecked = context.settings().isPullToRefreshEnabledInBrowser
            onPreferenceChangeListener = SharedPreferenceUpdater()
        }
        requirePreference<SwitchPreference>(R.string.pref_key_dynamic_toolbar).apply {
            isChecked = context.settings().isDynamicToolbarEnabled
            onPreferenceChangeListener = SharedPreferenceUpdater()
        }
        requirePreference<SwitchPreference>(R.string.pref_key_swipe_toolbar_switch_tabs).apply {
            isChecked = context.settings().isSwipeToolbarToSwitchTabsEnabled
            onPreferenceChangeListener = SharedPreferenceUpdater()
        }
    }

    override fun onPreferenceTreeClick(preference: Preference): Boolean {
        when (preference.key) {
            resources.getString(R.string.pref_key_website_pull_to_refresh) -> {
                PullToRefreshInBrowser.enabled.set(requireContext().settings().isPullToRefreshEnabledInBrowser)
            }
        }
        return super.onPreferenceTreeClick(preference)
    }

    companion object {
        // Used to send telemetry data about toolbar position changes
        enum class Position { TOP, BOTTOM }
    }
}
