/*
 * Copyright (C) 2023 MURENA SAS
 * Copyright (C) 2022 E FOUNDATION
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package foundation.e.advancedprivacy.widget

import android.app.PendingIntent
import android.app.PendingIntent.FLAG_IMMUTABLE
import android.app.PendingIntent.FLAG_UPDATE_CURRENT
import android.appwidget.AppWidgetManager
import android.content.ComponentName
import android.content.Context
import android.content.Intent
import android.view.View
import android.widget.RemoteViews
import foundation.e.advancedprivacy.R
import foundation.e.advancedprivacy.Widget
import foundation.e.advancedprivacy.Widget.Companion.isDarkText
import foundation.e.advancedprivacy.common.extensions.dpToPxF
import foundation.e.advancedprivacy.domain.entities.FeatureState
import foundation.e.advancedprivacy.domain.entities.QuickPrivacyState
import foundation.e.advancedprivacy.domain.entities.TrackerMode
import foundation.e.advancedprivacy.features.dashboard.DashboardFragmentArgs
import foundation.e.advancedprivacy.main.MainActivity
import foundation.e.advancedprivacy.widget.WidgetCommandReceiver.Companion.ACTION_TOGGLE_IPSCRAMBLING
import foundation.e.advancedprivacy.widget.WidgetCommandReceiver.Companion.ACTION_TOGGLE_LOCATION
import foundation.e.advancedprivacy.widget.WidgetCommandReceiver.Companion.ACTION_TOGGLE_TRACKERS
import foundation.e.advancedprivacy.widget.WidgetCommandReceiver.Companion.PARAM_FEATURE_ENABLED

data class State(
    val quickPrivacyState: QuickPrivacyState = QuickPrivacyState.DISABLED,
    val trackerMode: TrackerMode = TrackerMode.VULNERABLE,
    val isLocationHidden: Boolean = false,
    val ipScramblingMode: FeatureState = FeatureState.STOPPING,
    val dayStatistics: List<Pair<Int, Int>> = emptyList(),
    val activeTrackersCount: Int = 0,
)

fun render(
    context: Context,
    state: State,
    appWidgetManager: AppWidgetManager,
) {
    val views = RemoteViews(context.packageName, R.layout.widget)
    applyDarkText(context, state, views)
    views.apply {
        val openPIntent = PendingIntent.getActivity(
            context,
            REQUEST_CODE_DASHBOARD,
            Intent(context, MainActivity::class.java),
            FLAG_IMMUTABLE or FLAG_UPDATE_CURRENT
        )
        setOnClickPendingIntent(R.id.settings_btn, openPIntent)
        setOnClickPendingIntent(R.id.widget_container, openPIntent)

        setTextViewText(
            R.id.state_label,
            context.getString(
                when (state.quickPrivacyState) {
                    QuickPrivacyState.DISABLED -> R.string.widget_state_title_off
                    QuickPrivacyState.FULL_ENABLED -> R.string.widget_state_title_on
                    QuickPrivacyState.ENABLED -> R.string.widget_state_title_custom
                }
            )
        )

        val trackersEnabled = state.trackerMode != TrackerMode.VULNERABLE
        setImageViewResource(
            R.id.toggle_trackers,
            if (trackersEnabled) R.drawable.ic_switch_enabled else R.drawable.ic_switch_disabled
        )

        setOnClickPendingIntent(
            R.id.toggle_trackers,
            PendingIntent.getBroadcast(
                context,
                REQUEST_CODE_TOGGLE_TRACKERS,
                Intent(context, WidgetCommandReceiver::class.java).apply {
                    action = ACTION_TOGGLE_TRACKERS
                    putExtra(PARAM_FEATURE_ENABLED, !trackersEnabled)
                },
                FLAG_IMMUTABLE or FLAG_UPDATE_CURRENT
            )
        )

        setTextViewText(
            R.id.state_trackers,
            context.getString(
                when (state.trackerMode) {
                    TrackerMode.DENIED -> R.string.widget_state_trackers_on
                    TrackerMode.VULNERABLE -> R.string.widget_state_trackers_off
                    TrackerMode.CUSTOM -> R.string.widget_state_trackers_custom
                }
            )
        )

        setImageViewResource(
            R.id.toggle_location,
            if (state.isLocationHidden) R.drawable.ic_switch_enabled
            else R.drawable.ic_switch_disabled
        )

        setOnClickPendingIntent(
            R.id.toggle_location,
            PendingIntent.getBroadcast(
                context,
                REQUEST_CODE_TOGGLE_LOCATION,
                Intent(context, WidgetCommandReceiver::class.java).apply {
                    action = ACTION_TOGGLE_LOCATION
                    putExtra(PARAM_FEATURE_ENABLED, !state.isLocationHidden)
                },
                FLAG_IMMUTABLE or FLAG_UPDATE_CURRENT
            )
        )

        setTextViewText(
            R.id.state_geolocation,
            context.getString(
                if (state.isLocationHidden) R.string.widget_state_geolocation_on
                else R.string.widget_state_geolocation_off
            )
        )

        setImageViewResource(
            R.id.toggle_ipscrambling,
            if (state.ipScramblingMode.isChecked) R.drawable.ic_switch_enabled
            else R.drawable.ic_switch_disabled
        )

        setOnClickPendingIntent(
            R.id.toggle_ipscrambling,
            PendingIntent.getBroadcast(
                context,
                REQUEST_CODE_TOGGLE_IPSCRAMBLING,
                Intent(context, WidgetCommandReceiver::class.java).apply {
                    action = ACTION_TOGGLE_IPSCRAMBLING
                    putExtra(PARAM_FEATURE_ENABLED, !state.ipScramblingMode.isChecked)
                },
                FLAG_IMMUTABLE or FLAG_UPDATE_CURRENT
            )
        )

        setTextViewText(
            R.id.state_ip_address,
            context.getString(
                if (state.ipScramblingMode == FeatureState.ON) R.string.widget_state_ipaddress_on
                else R.string.widget_state_ipaddress_off
            )
        )

        val loading = state.ipScramblingMode.isLoading

        setViewVisibility(R.id.state_ip_address, if (loading) View.GONE else View.VISIBLE)

        setViewVisibility(R.id.state_ip_address_loader, if (loading) View.VISIBLE else View.GONE)

        if (state.dayStatistics.all { it.first == 0 && it.second == 0 }) {
            setViewVisibility(R.id.graph, View.GONE)
            setViewVisibility(R.id.graph_legend, View.GONE)
            setViewVisibility(R.id.graph_empty, View.VISIBLE)
            setViewVisibility(R.id.graph_legend_values, View.GONE)
            setViewVisibility(R.id.graph_view_trackers_btn, View.GONE)
        } else {
            setViewVisibility(R.id.graph, View.VISIBLE)
            setViewVisibility(R.id.graph_legend, View.VISIBLE)
            setViewVisibility(R.id.graph_empty, View.GONE)
            setViewVisibility(R.id.graph_legend_values, View.VISIBLE)
            setViewVisibility(R.id.graph_view_trackers_btn, View.VISIBLE)

            val pIntent = MainActivity.deepLinkBuilder(context)
                .setDestination(R.id.trackersFragment)
                .createPendingIntent()

            setOnClickPendingIntent(R.id.graph_view_trackers_btn, pIntent)

            val graphHeightPx = 26.dpToPxF(context)
            val maxValue =
                state.dayStatistics
                    .map { it.first + it.second }
                    .maxOrNull()
                    .let { if (it == null || it == 0) 1 else it }
            val ratio = graphHeightPx / maxValue

            state.dayStatistics.forEachIndexed { index, (blocked, leaked) ->
                // blocked (the bar below)
                val middlePadding = graphHeightPx - blocked * ratio
                setViewPadding(blockedBarIds[index], 0, middlePadding.toInt(), 0, 0)

                // leaked (the bar above)
                val topPadding = graphHeightPx - (blocked + leaked) * ratio
                setViewPadding(leakedBarIds[index], 0, topPadding.toInt(), 0, 0)

                val highlightPIntent = MainActivity.deepLinkBuilder(context)
                    .setDestination(R.id.dashboardFragment)
                    .setArguments(DashboardFragmentArgs(highlightLeaks = index).toBundle())
                    .createPendingIntent()
                setOnClickPendingIntent(containerBarIds[index], highlightPIntent)
            }

            setTextViewText(
                R.id.graph_legend,
                context.getString(
                    R.string.widget_graph_trackers_legend,
                    state.activeTrackersCount.toString()
                )
            )
        }
    }

    appWidgetManager.updateAppWidget(ComponentName(context, Widget::class.java), views)
}

private val containerBarIds = listOf(
    R.id.widget_graph_bar_container_0,
    R.id.widget_graph_bar_container_1,
    R.id.widget_graph_bar_container_2,
    R.id.widget_graph_bar_container_3,
    R.id.widget_graph_bar_container_4,
    R.id.widget_graph_bar_container_5,
    R.id.widget_graph_bar_container_6,
    R.id.widget_graph_bar_container_7,
    R.id.widget_graph_bar_container_8,
    R.id.widget_graph_bar_container_9,
    R.id.widget_graph_bar_container_10,
    R.id.widget_graph_bar_container_11,
    R.id.widget_graph_bar_container_12,
    R.id.widget_graph_bar_container_13,
    R.id.widget_graph_bar_container_14,
    R.id.widget_graph_bar_container_15,
    R.id.widget_graph_bar_container_16,
    R.id.widget_graph_bar_container_17,
    R.id.widget_graph_bar_container_18,
    R.id.widget_graph_bar_container_19,
    R.id.widget_graph_bar_container_20,
    R.id.widget_graph_bar_container_21,
    R.id.widget_graph_bar_container_22,
    R.id.widget_graph_bar_container_23,
)

private val blockedBarIds = listOf(
    R.id.widget_graph_bar_0,
    R.id.widget_graph_bar_1,
    R.id.widget_graph_bar_2,
    R.id.widget_graph_bar_3,
    R.id.widget_graph_bar_4,
    R.id.widget_graph_bar_5,
    R.id.widget_graph_bar_6,
    R.id.widget_graph_bar_7,
    R.id.widget_graph_bar_8,
    R.id.widget_graph_bar_9,
    R.id.widget_graph_bar_10,
    R.id.widget_graph_bar_11,
    R.id.widget_graph_bar_12,
    R.id.widget_graph_bar_13,
    R.id.widget_graph_bar_14,
    R.id.widget_graph_bar_15,
    R.id.widget_graph_bar_16,
    R.id.widget_graph_bar_17,
    R.id.widget_graph_bar_18,
    R.id.widget_graph_bar_19,
    R.id.widget_graph_bar_20,
    R.id.widget_graph_bar_21,
    R.id.widget_graph_bar_22,
    R.id.widget_graph_bar_23
)

private val leakedBarIds = listOf(
    R.id.widget_leaked_graph_bar_0,
    R.id.widget_leaked_graph_bar_1,
    R.id.widget_leaked_graph_bar_2,
    R.id.widget_leaked_graph_bar_3,
    R.id.widget_leaked_graph_bar_4,
    R.id.widget_leaked_graph_bar_5,
    R.id.widget_leaked_graph_bar_6,
    R.id.widget_leaked_graph_bar_7,
    R.id.widget_leaked_graph_bar_8,
    R.id.widget_leaked_graph_bar_9,
    R.id.widget_leaked_graph_bar_10,
    R.id.widget_leaked_graph_bar_11,
    R.id.widget_leaked_graph_bar_12,
    R.id.widget_leaked_graph_bar_13,
    R.id.widget_leaked_graph_bar_14,
    R.id.widget_leaked_graph_bar_15,
    R.id.widget_leaked_graph_bar_16,
    R.id.widget_leaked_graph_bar_17,
    R.id.widget_leaked_graph_bar_18,
    R.id.widget_leaked_graph_bar_19,
    R.id.widget_leaked_graph_bar_20,
    R.id.widget_leaked_graph_bar_21,
    R.id.widget_leaked_graph_bar_22,
    R.id.widget_leaked_graph_bar_23
)

private const val REQUEST_CODE_DASHBOARD = 1
private const val REQUEST_CODE_TRACKERS = 3
private const val REQUEST_CODE_TOGGLE_TRACKERS = 4
private const val REQUEST_CODE_TOGGLE_LOCATION = 5
private const val REQUEST_CODE_TOGGLE_IPSCRAMBLING = 6
private const val REQUEST_CODE_HIGHLIGHT = 100

fun applyDarkText(context: Context, state: State, views: RemoteViews) {
    views.apply {
        listOf(
            R.id.state_label,
            R.id.graph_legend_blocked,
            R.id.graph_legend_allowed,

        )
            .forEach {
                setTextColor(
                    it,
                    context.getColor(if (isDarkText) R.color.on_surface_disabled_light else R.color.on_primary_medium_emphasis)
                )
            }
        setTextColor(
            R.id.widget_title,
            context.getColor(if (isDarkText) R.color.on_surface_medium_emphasis_light else R.color.on_surface_high_emphasis)
        )
        listOf(
            R.id.state_trackers,
            R.id.state_geolocation,
            R.id.state_ip_address,
            R.id.graph_legend,
            R.id.graph_view_trackers_btn
        )
            .forEach {
                setTextColor(
                    it,
                    context.getColor(if (isDarkText) R.color.on_surface_medium_emphasis_light else R.color.on_primary_high_emphasis)
                )
            }

        listOf(
            R.id.trackers_label,
            R.id.geolocation_label,
            R.id.ip_address_label,
            R.id.graph_empty

        )
            .forEach {
                setTextColor(
                    it,
                    context.getColor(if (isDarkText) R.color.on_surface_disabled_light else R.color.on_primary_disabled)
                )
            }
        setTextViewCompoundDrawables(
            R.id.graph_view_trackers_btn,
            0,
            0,
            if (isDarkText) R.drawable.ic_chevron_right_24dp_light else R.drawable.ic_chevron_right_24dp,
            0
        )
        setImageViewResource(
            R.id.settings_btn,
            if (isDarkText) R.drawable.ic_settings_light else R.drawable.ic_settings
        )
        setImageViewResource(
            R.id.state_icon,
            if (isDarkText) {
                if (state.quickPrivacyState.isEnabled()) R.drawable.ic_shield_on_light
                else R.drawable.ic_shield_off_light
            } else {
                if (state.quickPrivacyState.isEnabled()) R.drawable.ic_shield_on_white
                else R.drawable.ic_shield_off_white
            }
        )
    }
}