/* 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.quicksettings

import android.graphics.drawable.Drawable
import android.view.View
import android.view.View.GONE
import android.view.View.VISIBLE
import android.view.ViewGroup
import android.widget.Switch
import android.widget.TextView
import androidx.appcompat.content.res.AppCompatResources
import androidx.appcompat.widget.AppCompatTextView
import androidx.core.content.ContextCompat
import io.reactivex.Observable
import io.reactivex.Observer
import io.reactivex.functions.Consumer
import mozilla.components.feature.sitepermissions.SitePermissions
import mozilla.components.feature.sitepermissions.SitePermissions.Status.BLOCKED
import mozilla.components.feature.sitepermissions.SitePermissions.Status.NO_DECISION
import mozilla.components.support.ktx.android.net.hostWithoutCommonPrefixes
import mozilla.components.support.ktx.kotlin.toUri
import org.mozilla.fenix.R
import org.mozilla.fenix.mvi.UIView
import org.mozilla.fenix.settings.PhoneFeature
import org.mozilla.fenix.settings.PhoneFeature.CAMERA
import org.mozilla.fenix.settings.PhoneFeature.LOCATION
import org.mozilla.fenix.settings.PhoneFeature.MICROPHONE
import org.mozilla.fenix.settings.PhoneFeature.NOTIFICATION
import org.mozilla.fenix.utils.Settings

@Suppress("TooManyFunctions")
class QuickSettingsUIView(
    container: ViewGroup,
    actionEmitter: Observer<QuickSettingsAction>,
    changesObservable: Observable<QuickSettingsChange>,
    override val view: View
) : UIView<QuickSettingsState, QuickSettingsAction, QuickSettingsChange>(
    container, actionEmitter, changesObservable
) {
    private val securityInfoLabel: TextView
    private val urlLabel: TextView
    private val trackingProtectionSwitch: Switch
    private val trackingProtectionAction: TextView
    private val cameraActionLabel: TextView
    private val cameraLabel: TextView
    private val microphoneActionLabel: TextView
    private val microphoneLabel: TextView
    private val locationActionLabel: TextView
    private val locationLabel: TextView
    private val notificationActionLabel: TextView
    private val notificationLabel: TextView
    private val blockedByAndroidPhoneFeatures = mutableListOf<PhoneFeature>()
    private val context get() = view.context
    private val settings: Settings = Settings.getInstance(context)

    init {
        urlLabel = view.findViewById<AppCompatTextView>(R.id.url)
        securityInfoLabel = view.findViewById<AppCompatTextView>(R.id.security_info)
        trackingProtectionSwitch = view.findViewById(R.id.tracking_protection)
        trackingProtectionAction = view.findViewById(R.id.tracking_protection_action)
        cameraActionLabel = view.findViewById<AppCompatTextView>(R.id.camera_action_label)
        cameraLabel = view.findViewById<AppCompatTextView>(R.id.camera_icon)
        microphoneActionLabel = view.findViewById<AppCompatTextView>(R.id.microphone_action_label)
        microphoneLabel = view.findViewById<AppCompatTextView>(R.id.microphone_icon)
        locationLabel = view.findViewById<AppCompatTextView>(R.id.location_icon)
        locationActionLabel = view.findViewById<AppCompatTextView>(R.id.location_action_label)
        notificationActionLabel = view.findViewById<AppCompatTextView>(R.id.notification_action_label)
        notificationLabel = view.findViewById<AppCompatTextView>(R.id.notification_icon)
    }

    override fun updateView() = Consumer<QuickSettingsState> { state ->
        when (state.mode) {
            is QuickSettingsState.Mode.Normal -> {
                bindUrl(state.mode.url)
                bindSecurityInfo(state.mode.isSecured)
                bindTrackingProtectionAction(state.mode.url)
                bindTrackingProtectionInfo(state.mode.isTrackingProtectionOn)
                bindPhoneFeatureItem(CAMERA, state.mode.sitePermissions)
                bindPhoneFeatureItem(MICROPHONE, state.mode.sitePermissions)
                bindPhoneFeatureItem(NOTIFICATION, state.mode.sitePermissions)
                bindPhoneFeatureItem(LOCATION, state.mode.sitePermissions)
            }
            is QuickSettingsState.Mode.ActionLabelUpdated -> {
                bindPhoneFeatureItem(state.mode.phoneFeature, state.mode.sitePermissions)
            }
            is QuickSettingsState.Mode.CheckPendingFeatureBlockedByAndroid -> {
                checkFeaturesBlockedByAndroid(state.mode.sitePermissions)
            }
        }
    }

    private fun bindUrl(url: String) {
        urlLabel.text = url.toUri().hostWithoutCommonPrefixes
    }

    private fun bindTrackingProtectionInfo(isTrackingProtectionOn: Boolean) {
        val globalTPSetting = Settings.getInstance(context).shouldUseTrackingProtection
        val drawableId =
            if (isTrackingProtectionOn) R.drawable.ic_tracking_protection else
                R.drawable.ic_tracking_protection_disabled
        val icon = AppCompatResources.getDrawable(context, drawableId)
        trackingProtectionSwitch.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null)
        trackingProtectionSwitch.isChecked = isTrackingProtectionOn
        trackingProtectionSwitch.isEnabled = globalTPSetting

        trackingProtectionSwitch.setOnCheckedChangeListener { _, isChecked ->
            actionEmitter.onNext(
                QuickSettingsAction.ToggleTrackingProtection(
                    isChecked
                )
            )
        }
    }

    private fun bindTrackingProtectionAction(url: String) {
        val globalTPSetting = Settings.getInstance(context).shouldUseTrackingProtection
        trackingProtectionAction.text =
            if (globalTPSetting)
                context.getString(R.string.browser_menu_report_issue) else
                context.getString(R.string.preferences_tracking_protection_turned_off_globally)
        trackingProtectionAction.setOnClickListener {
            if (globalTPSetting) {
                actionEmitter.onNext(
                    QuickSettingsAction.SelectReportProblem(url)
                )
            } else {
                actionEmitter.onNext(
                    QuickSettingsAction.SelectTrackingProtectionSettings
                )
            }
        }
    }

    private fun bindSecurityInfo(isSecured: Boolean) {
        val stringId: Int
        val drawableId: Int
        val drawableTint: Int

        if (isSecured) {
            stringId = R.string.quick_settings_sheet_secure_connection
            drawableId = R.drawable.mozac_ic_lock
            drawableTint = R.color.photonGreen50
        } else {
            stringId = R.string.quick_settings_sheet_insecure_connection
            drawableId = R.drawable.mozac_ic_globe
            drawableTint = R.color.photonRed50
        }

        val icon = AppCompatResources.getDrawable(context, drawableId)
        icon?.setTint(ContextCompat.getColor(context, drawableTint))
        securityInfoLabel.setText(stringId)
        securityInfoLabel.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null)
    }

    private fun bindPhoneFeatureItem(phoneFeature: PhoneFeature, sitePermissions: SitePermissions? = null) {
        if (phoneFeature.shouldBeHidden(sitePermissions)) {
            hide(phoneFeature)
            return
        }
        show(phoneFeature)
        if (!phoneFeature.isAndroidPermissionGranted(context)) {
            handleBlockedByAndroidAction(phoneFeature)
        } else {
            bindPhoneAction(phoneFeature, sitePermissions)
        }
    }

    private fun show(phoneFeature: PhoneFeature) {
        val (label, action) = phoneFeature.labelAndAction
        label.visibility = VISIBLE
        action.visibility = VISIBLE
    }

    private fun hide(phoneFeature: PhoneFeature) {
        val (label, action) = phoneFeature.labelAndAction
        label.visibility = GONE
        action.visibility = GONE
    }

    private fun PhoneFeature.shouldBeHidden(sitePermissions: SitePermissions?): Boolean {
        return getStatus(sitePermissions, settings) == NO_DECISION
    }

    private fun PhoneFeature.isPermissionBlocked(sitePermissions: SitePermissions?): Boolean {
        return getStatus(sitePermissions, settings) == BLOCKED
    }

    private fun handleBlockedByAndroidAction(phoneFeature: PhoneFeature) {
        val (label, action) = phoneFeature.labelAndAction

        action.setText(R.string.phone_feature_blocked_by_android)
        action.tag = phoneFeature
        action.setOnClickListener {
            val feature = it.tag as PhoneFeature
            actionEmitter.onNext(
                QuickSettingsAction.SelectBlockedByAndroid(
                    feature.androidPermissionsList
                )
            )
        }
        label.setCompoundDrawablesWithIntrinsicBounds(phoneFeature.disabledIcon, null, null, null)
        label.isEnabled = false
        blockedByAndroidPhoneFeatures.add(phoneFeature)
    }

    private fun bindPhoneAction(phoneFeature: PhoneFeature, sitePermissions: SitePermissions? = null) {
        val (label, action) = phoneFeature.labelAndAction

        action.text = phoneFeature.getActionLabel(
            context = context,
            sitePermissions = sitePermissions,
            settings = settings
        )

        action.tag = phoneFeature
        action.setOnClickListener {
            val feature = it.tag as PhoneFeature
            actionEmitter.onNext(
                QuickSettingsAction.TogglePermission(feature)
            )
        }

        val icon = if (phoneFeature.isPermissionBlocked(sitePermissions)) {
            label.isEnabled = false
            phoneFeature.disabledIcon
        } else {
            label.isEnabled = true
            phoneFeature.enabledIcon
        }

        label.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null)
        blockedByAndroidPhoneFeatures.remove(phoneFeature)
    }

    private fun checkFeaturesBlockedByAndroid(sitePermissions: SitePermissions?) {
        val clonedList = blockedByAndroidPhoneFeatures.toTypedArray()
        clonedList.forEach { phoneFeature ->
            if (phoneFeature.isAndroidPermissionGranted(context)) {
                bindPhoneAction(phoneFeature, sitePermissions)
            }
        }
    }

    private val PhoneFeature.labelAndAction
        get(): Pair<TextView, TextView> {
            return when (this) {
                CAMERA -> cameraLabel to cameraActionLabel
                LOCATION -> locationLabel to locationActionLabel
                MICROPHONE -> microphoneLabel to microphoneActionLabel
                NOTIFICATION -> notificationLabel to notificationActionLabel
            }
        }

    private val PhoneFeature.enabledIcon
        get(): Drawable {
            val drawableId = when (this) {
                CAMERA -> R.drawable.ic_camera
                LOCATION -> R.drawable.ic_location
                MICROPHONE -> R.drawable.ic_microphone
                NOTIFICATION -> R.drawable.ic_notification
            }
            return requireNotNull(AppCompatResources.getDrawable(context, drawableId))
        }

    private val PhoneFeature.disabledIcon
        get(): Drawable {
            val drawableId = when (this) {
                CAMERA -> R.drawable.ic_camera_disabled
                LOCATION -> R.drawable.ic_location_disabled
                MICROPHONE -> R.drawable.ic_microphone_disabled
                NOTIFICATION -> R.drawable.ic_notifications_disabled
            }
            return requireNotNull(AppCompatResources.getDrawable(context, drawableId))
        }
}