/* 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.content.ActivityNotFoundException
import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.net.Uri
import android.os.Build
import android.os.Build.VERSION.SDK_INT
import android.os.Bundle
import android.provider.Settings
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.navigation.Navigation
import androidx.navigation.fragment.findNavController
import androidx.preference.Preference
import androidx.preference.Preference.OnPreferenceClickListener
import androidx.preference.PreferenceCategory
import androidx.preference.PreferenceFragmentCompat
import androidx.preference.SwitchPreference
import kotlinx.coroutines.launch
import mozilla.components.concept.sync.AccountObserver
import mozilla.components.concept.sync.AuthType
import mozilla.components.concept.sync.OAuthAccount
import mozilla.components.concept.sync.Profile
import org.mozilla.fenix.BrowserDirection
import org.mozilla.fenix.Config
import org.mozilla.fenix.FeatureFlags
import org.mozilla.fenix.FenixApplication
import org.mozilla.fenix.HomeActivity
import org.mozilla.fenix.R
import org.mozilla.fenix.R.string.pref_key_about
import org.mozilla.fenix.R.string.pref_key_accessibility
import org.mozilla.fenix.R.string.pref_key_account
import org.mozilla.fenix.R.string.pref_key_account_auth_error
import org.mozilla.fenix.R.string.pref_key_account_category
import org.mozilla.fenix.R.string.pref_key_add_private_browsing_shortcut
import org.mozilla.fenix.R.string.pref_key_data_choices
import org.mozilla.fenix.R.string.pref_key_delete_browsing_data
import org.mozilla.fenix.R.string.pref_key_delete_browsing_data_on_quit_preference
import org.mozilla.fenix.R.string.pref_key_help
import org.mozilla.fenix.R.string.pref_key_language
import org.mozilla.fenix.R.string.pref_key_launch_links_in_private_mode
import org.mozilla.fenix.R.string.pref_key_leakcanary
import org.mozilla.fenix.R.string.pref_key_make_default_browser
import org.mozilla.fenix.R.string.pref_key_privacy_link
import org.mozilla.fenix.R.string.pref_key_rate
import org.mozilla.fenix.R.string.pref_key_remote_debugging
import org.mozilla.fenix.R.string.pref_key_search_settings
import org.mozilla.fenix.R.string.pref_key_sign_in
import org.mozilla.fenix.R.string.pref_key_site_permissions
import org.mozilla.fenix.R.string.pref_key_theme
import org.mozilla.fenix.R.string.pref_key_tracking_protection_settings
import org.mozilla.fenix.R.string.pref_key_your_rights
import org.mozilla.fenix.components.PrivateShortcutCreateManager
import org.mozilla.fenix.components.metrics.Event
import org.mozilla.fenix.ext.components
import org.mozilla.fenix.ext.getPreferenceKey
import org.mozilla.fenix.ext.metrics
import org.mozilla.fenix.ext.requireComponents
import org.mozilla.fenix.ext.settings
import org.mozilla.fenix.settings.account.AccountAuthErrorPreference
import org.mozilla.fenix.settings.account.AccountPreference
import org.mozilla.fenix.utils.ItsNotBrokenSnack

@SuppressWarnings("TooManyFunctions", "LargeClass")
class SettingsFragment : PreferenceFragmentCompat(), AccountObserver {
    private val preferenceChangeListener =
        SharedPreferences.OnSharedPreferenceChangeListener { sharedPreferences, key ->
            try {
                context?.let {
                    it.components.analytics.metrics.track(
                        Event.PreferenceToggled
                            (key, sharedPreferences.getBoolean(key, false), it)
                    )
                }
            } catch (e: IllegalArgumentException) {
                // The event is not tracked
            } catch (e: ClassCastException) {
                // The setting is not a boolean, not tracked
            }
        }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Observe account changes to keep the UI up-to-date.
        requireComponents.backgroundServices.accountManager.register(this, owner = this, autoPause = true)

        // It's important to update the account UI state in onCreate, even though we also call it in onResume, since
        // that ensures we'll never display an incorrect state in the UI. For example, if user is signed-in, and we
        // don't perform this call in onCreate, we'll briefly display a "Sign In" preference, which will then get
        // replaced by the correct account information once this call is ran in onResume shortly after.
        updateAccountUIState(context!!, requireComponents.backgroundServices.accountManager.accountProfile())

        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(preferenceChangeListener)

        if (SDK_INT <= Build.VERSION_CODES.M) {
            findPreference<DefaultBrowserPreference>(getPreferenceKey(R.string.pref_key_make_default_browser))?.apply {
                isVisible = false
            }
        }

        if (FeatureFlags.deleteDataOnQuit) {
            findPreference<Preference>(
                getPreferenceKey(R.string.pref_key_delete_browsing_data_on_quit_preference)
            )?.apply {
                isVisible = true
            }
        }
    }

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

    override fun onResume() {
        super.onResume()

        (activity as AppCompatActivity).title = getString(R.string.settings_title)
        (activity as AppCompatActivity).supportActionBar?.show()
        val defaultBrowserPreference =
            findPreference<DefaultBrowserPreference>(getPreferenceKey(R.string.pref_key_make_default_browser))
        defaultBrowserPreference?.updateSwitch()

        val trackingProtectionPreference =
            findPreference<Preference>(getPreferenceKey(R.string.pref_key_tracking_protection_settings))
        trackingProtectionPreference?.summary = context?.let {
            if (it.settings().shouldUseTrackingProtection) {
                getString(R.string.tracking_protection_on)
            } else {
                getString(R.string.tracking_protection_off)
            }
        }

        val themesPreference =
            findPreference<Preference>(getPreferenceKey(R.string.pref_key_theme))
        themesPreference?.summary = context?.settings()?.themeSettingString

        val aboutPreference = findPreference<Preference>(getPreferenceKey(R.string.pref_key_about))
        val appName = getString(R.string.app_name)
        aboutPreference?.title = getString(R.string.preferences_about, appName)

        setupPreferences()

        updateAccountUIState(context!!, requireComponents.backgroundServices.accountManager.accountProfile())
    }

    @Suppress("ComplexMethod", "LongMethod")
    override fun onPreferenceTreeClick(preference: Preference): Boolean {
        when (preference.key) {
            resources.getString(pref_key_search_settings) -> {
                navigateToSearchEngineSettings()
            }
            resources.getString(pref_key_tracking_protection_settings) -> {
                requireContext().metrics.track(Event.TrackingProtectionSettings)
                navigateToTrackingProtectionSettings()
            }
            resources.getString(pref_key_site_permissions) -> {
                navigateToSitePermissions()
            }
            resources.getString(pref_key_add_private_browsing_shortcut) -> {
                requireContext().metrics.track(Event.PrivateBrowsingCreateShortcut)
                PrivateShortcutCreateManager.createPrivateShortcut(requireContext())
            }
            resources.getString(pref_key_accessibility) -> {
                navigateToAccessibility()
            }
            resources.getString(pref_key_language) -> {
                // TODO #220
                ItsNotBrokenSnack(context!!).showSnackbar(issueNumber = "220")
            }
            resources.getString(pref_key_data_choices) -> {
                navigateToDataChoices()
            }
            resources.getString(pref_key_help) -> {
                (activity as HomeActivity).openToBrowserAndLoad(
                    searchTermOrURL = SupportUtils.getSumoURLForTopic(context!!, SupportUtils.SumoTopic.HELP),
                    newTab = true,
                    from = BrowserDirection.FromSettings
                )
            }
            resources.getString(pref_key_rate) -> {
                try {
                    startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(SupportUtils.RATE_APP_URL)))
                } catch (e: ActivityNotFoundException) {
                    // Device without the play store installed.
                    // Opening the play store website.
                    (activity as HomeActivity).openToBrowserAndLoad(
                        searchTermOrURL = SupportUtils.FENIX_PLAY_STORE_URL,
                        newTab = true,
                        from = BrowserDirection.FromSettings
                    )
                }
            }
            resources.getString(pref_key_about) -> {
                navigateToAbout()
            }
            resources.getString(pref_key_account) -> {
                navigateToAccountSettings()
            }
            resources.getString(pref_key_account_auth_error) -> {
                navigateToAccountProblem()
            }
            resources.getString(pref_key_delete_browsing_data) -> {
                navigateToDeleteBrowsingData()
            }
            resources.getString(pref_key_delete_browsing_data_on_quit_preference) -> {
                navigateToDeleteBrowsingDataOnQuit()
            }
            resources.getString(pref_key_theme) -> {
                navigateToThemeSettings()
            }
            resources.getString(pref_key_privacy_link) -> {
                requireContext().let { context ->
                    val intent = SupportUtils.createCustomTabIntent(context, SupportUtils.getPrivacyNoticeUrl())
                    startActivity(intent)
                }
            }
            resources.getString(pref_key_your_rights) -> {
                requireContext().let { context ->
                    val intent = SupportUtils.createCustomTabIntent(
                        context,
                        SupportUtils.getSumoURLForTopic(context, SupportUtils.SumoTopic.YOUR_RIGHTS)
                    )
                    startActivity(intent)
                }
            }
        }
        return super.onPreferenceTreeClick(preference)
    }

    override fun onDestroy() {
        super.onDestroy()
        preferenceManager.sharedPreferences.unregisterOnSharedPreferenceChangeListener(preferenceChangeListener)
    }

    private fun getClickListenerForSignIn(): OnPreferenceClickListener {
        return OnPreferenceClickListener {
            context!!.components.services.launchPairingSignIn(context!!, findNavController())
            true
        }
    }

    private fun setupPreferences() {
        val makeDefaultBrowserKey = getPreferenceKey(pref_key_make_default_browser)
        val leakKey = getPreferenceKey(pref_key_leakcanary)
        val debuggingKey = getPreferenceKey(pref_key_remote_debugging)
        val preferenceAlwaysOpenInPrivateModeKey = getPreferenceKey(
            pref_key_launch_links_in_private_mode
        )

        val preferenceMakeDefaultBrowser = findPreference<Preference>(makeDefaultBrowserKey)
        val preferenceLeakCanary = findPreference<Preference>(leakKey)
        val preferenceRemoteDebugging = findPreference<Preference>(debuggingKey)
        val preferenceAlwaysOpenInPrivateMode = findPreference<SwitchPreference>(preferenceAlwaysOpenInPrivateModeKey)

        preferenceAlwaysOpenInPrivateMode?.setOnPreferenceClickListener {
            requireContext().settings().alwaysOpenInPrivateMode = !requireContext().settings().alwaysOpenInPrivateMode
            true
        }

        preferenceMakeDefaultBrowser?.onPreferenceClickListener =
            getClickListenerForMakeDefaultBrowser()

        if (!Config.channel.isReleased) {
            preferenceLeakCanary?.setOnPreferenceChangeListener { _, newValue ->
                (context?.applicationContext as FenixApplication).toggleLeakCanary(newValue as Boolean)
                true
            }
        }

        preferenceRemoteDebugging?.setOnPreferenceChangeListener { preference, newValue ->
        preference.context.settings().preferences.edit()
                .putBoolean(preference.key, newValue as Boolean).apply()
            requireComponents.core.engine.settings.remoteDebuggingEnabled = newValue
            true
        }
    }

    private val defaultClickListener = OnPreferenceClickListener { preference ->
        Toast.makeText(context, "${preference.title} Clicked", Toast.LENGTH_SHORT).show()
        true
    }

    private fun getClickListenerForMakeDefaultBrowser(): OnPreferenceClickListener {
        return if (SDK_INT >= Build.VERSION_CODES.N) {
            OnPreferenceClickListener {
                val intent = Intent(
                    Settings.ACTION_MANAGE_DEFAULT_APPS_SETTINGS
                )
                startActivity(intent)
                true
            }
        } else {
            defaultClickListener
        }
    }

    private fun navigateToSearchEngineSettings() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToSearchEngineFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToTrackingProtectionSettings() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToTrackingProtectionFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToThemeSettings() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToThemeFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToSitePermissions() {
        val directions =
            SettingsFragmentDirections.actionSettingsFragmentToSitePermissionsFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToAccessibility() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToAccessibilityFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToDataChoices() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToDataChoicesFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToAbout() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToAboutFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToAccountProblem() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToAccountProblemFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToAccountSettings() {
        val directions =
            SettingsFragmentDirections.actionSettingsFragmentToAccountSettingsFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToDeleteBrowsingData() {
        val directions = SettingsFragmentDirections.actionSettingsFragmentToDeleteBrowsingDataFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    private fun navigateToDeleteBrowsingDataOnQuit() {
        val directions =
            SettingsFragmentDirections.actionSettingsFragmentToDeleteBrowsingDataOnQuitFragment()
        Navigation.findNavController(view!!).navigate(directions)
    }

    override fun onAuthenticated(account: OAuthAccount, authType: AuthType) {
        lifecycleScope.launch {
            context?.let {
                updateAccountUIState(it, it.components.backgroundServices.accountManager.accountProfile())
            }
        }
    }

    override fun onLoggedOut() {
        lifecycleScope.launch {
            context?.let {
                updateAccountUIState(it, it.components.backgroundServices.accountManager.accountProfile())
            }
        }
    }

    override fun onProfileUpdated(profile: Profile) {
        lifecycleScope.launch {
            context?.let {
                updateAccountUIState(it, profile)
            }
        }
    }

    override fun onAuthenticationProblems() {
        lifecycleScope.launch {
            context?.let {
                updateAccountUIState(it, it.components.backgroundServices.accountManager.accountProfile())
            }
        }
    }

    /**
     * Updates the UI to reflect current account state.
     * Possible conditions are logged-in without problems, logged-out, and logged-in but needs to re-authenticate.
     */
    private fun updateAccountUIState(context: Context, profile: Profile?) {
        val preferenceSignIn =
            findPreference<Preference>(context.getPreferenceKey(pref_key_sign_in))
        val preferenceFirefoxAccount =
            findPreference<AccountPreference>(context.getPreferenceKey(pref_key_account))
        val preferenceFirefoxAccountAuthError =
            findPreference<AccountAuthErrorPreference>(context.getPreferenceKey(pref_key_account_auth_error))
        val accountPreferenceCategory =
            findPreference<PreferenceCategory>(context.getPreferenceKey(pref_key_account_category))

        val accountManager = requireComponents.backgroundServices.accountManager
        val account = accountManager.authenticatedAccount()

        // Signed-in, no problems.
        if (account != null && !accountManager.accountNeedsReauth()) {
            preferenceSignIn?.isVisible = false
            preferenceSignIn?.onPreferenceClickListener = null
            preferenceFirefoxAccountAuthError?.isVisible = false
            preferenceFirefoxAccount?.isVisible = true
            accountPreferenceCategory?.isVisible = true

            preferenceFirefoxAccount?.displayName = profile?.displayName
            preferenceFirefoxAccount?.email = profile?.email

            // Signed-in, need to re-authenticate.
        } else if (account != null && accountManager.accountNeedsReauth()) {
            preferenceFirefoxAccount?.isVisible = false
            preferenceFirefoxAccountAuthError?.isVisible = true
            accountPreferenceCategory?.isVisible = true

            preferenceSignIn?.isVisible = false
            preferenceSignIn?.onPreferenceClickListener = null

            preferenceFirefoxAccountAuthError?.email = profile?.email

            // Signed-out.
        } else {
            preferenceSignIn?.isVisible = true
            preferenceSignIn?.onPreferenceClickListener = getClickListenerForSignIn()
            preferenceFirefoxAccount?.isVisible = false
            preferenceFirefoxAccountAuthError?.isVisible = false
            accountPreferenceCategory?.isVisible = false
        }
    }
}