/* 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.os.Bundle
import androidx.navigation.findNavController
import androidx.preference.CheckBoxPreference
import androidx.preference.DropDownPreference
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
import androidx.preference.SwitchPreference
import org.mozilla.fenix.BrowserDirection
import org.mozilla.fenix.HomeActivity
import org.mozilla.fenix.R
import org.mozilla.fenix.components.metrics.Event
import org.mozilla.fenix.ext.components
import org.mozilla.fenix.ext.navigateBlockingForAsyncNavGraph
import org.mozilla.fenix.ext.nav
import org.mozilla.fenix.ext.requireComponents
import org.mozilla.fenix.ext.settings
import org.mozilla.fenix.ext.showToolbar
import org.mozilla.fenix.trackingprotection.TrackingProtectionMode
import org.mozilla.fenix.utils.view.addToRadioGroup

/**
 * Displays the toggle for tracking protection, options for tracking protection policy and a button
 * to open info about the tracking protection [org.mozilla.fenix.settings.TrackingProtectionFragment].
 */
class TrackingProtectionFragment : PreferenceFragmentCompat() {

    private val exceptionsClickListener = Preference.OnPreferenceClickListener {
        val directions =
            TrackingProtectionFragmentDirections.actionTrackingProtectionFragmentToExceptionsFragment()
        requireView().findNavController().navigateBlockingForAsyncNavGraph(directions)
        true
    }
    private lateinit var customCookies: CheckBoxPreference
    private lateinit var customCookiesSelect: DropDownPreference
    private lateinit var customTracking: CheckBoxPreference
    private lateinit var customTrackingSelect: DropDownPreference
    private lateinit var customCryptominers: CheckBoxPreference
    private lateinit var customFingerprinters: CheckBoxPreference
    private lateinit var customRedirectTrackers: CheckBoxPreference

    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        setPreferencesFromResource(R.xml.tracking_protection_preferences, rootKey)
        val radioStrict = bindTrackingProtectionRadio(TrackingProtectionMode.STRICT)
        val radioStandard = bindTrackingProtectionRadio(TrackingProtectionMode.STANDARD)
        val radioCustom = bindCustom()
        addToRadioGroup(radioStrict, radioStandard, radioCustom)
        updateCustomOptionsVisibility()
    }

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

        // Tracking Protection Switch
        val preferenceTP =
            requirePreference<SwitchPreference>(R.string.pref_key_tracking_protection)

        preferenceTP.isChecked = requireContext().settings().shouldUseTrackingProtection
        preferenceTP.setOnPreferenceChangeListener<Boolean> { preference, trackingProtectionOn ->
            preference.context.settings().shouldUseTrackingProtection =
                trackingProtectionOn
            with(preference.context.components) {
                val policy = core.trackingProtectionPolicyFactory.createTrackingProtectionPolicy()
                useCases.settingsUseCases.updateTrackingProtection(policy)
                useCases.sessionUseCases.reload()
            }
            true
        }

        val learnMorePreference = requirePreference<Preference>(R.string.pref_key_etp_learn_more)
        learnMorePreference.setOnPreferenceClickListener {
            (activity as HomeActivity).openToBrowserAndLoad(
                searchTermOrURL = SupportUtils.getGenericSumoURLForTopic
                    (SupportUtils.SumoTopic.TRACKING_PROTECTION),
                newTab = true,
                from = BrowserDirection.FromTrackingProtection
            )
            true
        }
        learnMorePreference.summary = getString(
            R.string.preference_enhanced_tracking_protection_explanation,
            getString(R.string.app_name)
        )

        val preferenceExceptions =
            requirePreference<Preference>(R.string.pref_key_tracking_protection_exceptions)
        preferenceExceptions.onPreferenceClickListener = exceptionsClickListener
    }

    private fun bindTrackingProtectionRadio(
        mode: TrackingProtectionMode
    ): RadioButtonInfoPreference {
        val radio = requirePreference<RadioButtonInfoPreference>(mode.preferenceKey)
        radio.contentDescription = getString(mode.contentDescriptionRes)

        val metrics = requireComponents.analytics.metrics
        radio.onClickListener {
            updateCustomOptionsVisibility()
            updateTrackingProtectionPolicy()
            when (mode) {
                TrackingProtectionMode.STANDARD ->
                    Event.TrackingProtectionSettingChanged.Setting.STANDARD
                TrackingProtectionMode.STRICT ->
                    Event.TrackingProtectionSettingChanged.Setting.STRICT
                TrackingProtectionMode.CUSTOM ->
                    Event.TrackingProtectionSettingChanged.Setting.CUSTOM
            }.let { setting ->
                metrics.track(Event.TrackingProtectionSettingChanged(setting))
            }
        }

        radio.onInfoClickListener {
            nav(
                R.id.trackingProtectionFragment,
                TrackingProtectionFragmentDirections
                    .actionTrackingProtectionFragmentToTrackingProtectionBlockingFragment(mode)
            )
        }

        return radio
    }

    private fun bindCustom(): RadioButtonInfoPreference {
        val radio = bindTrackingProtectionRadio(TrackingProtectionMode.CUSTOM)

        customCookies =
            requirePreference(R.string.pref_key_tracking_protection_custom_cookies)

        customCookiesSelect =
            requirePreference(R.string.pref_key_tracking_protection_custom_cookies_select)

        customTracking =
            requirePreference(R.string.pref_key_tracking_protection_custom_tracking_content)

        customTrackingSelect =
            requirePreference(R.string.pref_key_tracking_protection_custom_tracking_content_select)

        customCryptominers =
            requirePreference(R.string.pref_key_tracking_protection_custom_cryptominers)

        customFingerprinters =
            requirePreference(R.string.pref_key_tracking_protection_custom_fingerprinters)

        customRedirectTrackers =
            requirePreference(R.string.pref_key_tracking_protection_redirect_trackers)

        customCookies.onPreferenceChangeListener = object : SharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {
                customCookiesSelect.isVisible = !customCookies.isChecked
                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        customTracking.onPreferenceChangeListener = object : SharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {
                customTrackingSelect.isVisible = !customTracking.isChecked
                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        customCookiesSelect.onPreferenceChangeListener = object : StringSharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {
                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        customTrackingSelect.onPreferenceChangeListener = object : StringSharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {

                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        customCryptominers.onPreferenceChangeListener = object : SharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {
                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        customFingerprinters.onPreferenceChangeListener = object : SharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {
                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        customRedirectTrackers.onPreferenceChangeListener = object : SharedPreferenceUpdater() {
            override fun onPreferenceChange(preference: Preference, newValue: Any?): Boolean {
                return super.onPreferenceChange(preference, newValue).also {
                    updateTrackingProtectionPolicy()
                }
            }
        }

        updateCustomOptionsVisibility()

        return radio
    }

    private fun updateTrackingProtectionPolicy() {
        context?.components?.let {
            val policy = it.core.trackingProtectionPolicyFactory
                .createTrackingProtectionPolicy()
            it.useCases.settingsUseCases.updateTrackingProtection.invoke(policy)
            it.useCases.sessionUseCases.reload.invoke()
        }
    }

    private fun updateCustomOptionsVisibility() {
        val isCustomSelected = requireContext().settings().useCustomTrackingProtection
        customCookies.isVisible = isCustomSelected
        customCookiesSelect.isVisible = isCustomSelected && customCookies.isChecked
        customTracking.isVisible = isCustomSelected
        customTrackingSelect.isVisible = isCustomSelected && customTracking.isChecked
        customCryptominers.isVisible = isCustomSelected
        customFingerprinters.isVisible = isCustomSelected
        customRedirectTrackers.isVisible = isCustomSelected
    }
}