/*
 * Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
 * SPDX-License-Identifier: GPL-3.0-only
 */
package dev.msfjarvis.aps.util.services

import android.app.Notification
import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.app.Service
import android.content.ClipData
import android.content.Intent
import android.os.Build
import android.os.IBinder
import androidx.annotation.RequiresApi
import androidx.core.app.NotificationCompat
import androidx.core.content.getSystemService
import com.github.ajalt.timberkt.d
import dev.msfjarvis.aps.R
import dev.msfjarvis.aps.util.extensions.clipboard
import dev.msfjarvis.aps.util.extensions.sharedPrefs
import dev.msfjarvis.aps.util.settings.PreferenceKeys
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.cancel
import kotlinx.coroutines.delay
import kotlinx.coroutines.isActive
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext

class ClipboardService : Service() {

    private val scope = CoroutineScope(Job() + Dispatchers.Main)

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        if (intent != null) {
            when (intent.action) {
                ACTION_CLEAR -> {
                    clearClipboard()
                    stopForeground(true)
                    stopSelf()
                    return super.onStartCommand(intent, flags, startId)
                }

                ACTION_START -> {
                    val time = intent.getIntExtra(EXTRA_NOTIFICATION_TIME, 45)

                    if (time == 0) {
                        stopSelf()
                    }

                    createNotification(time)
                    scope.launch {
                        withContext(Dispatchers.IO) {
                            startTimer(time)
                        }
                        withContext(Dispatchers.Main) {
                            clearClipboard()
                            stopForeground(true)
                            stopSelf()
                        }
                    }
                    return START_NOT_STICKY
                }
            }
        }

        return super.onStartCommand(intent, flags, startId)
    }

    override fun onBind(intent: Intent?): IBinder? {
        return null
    }

    override fun onDestroy() {
        scope.cancel()
        super.onDestroy()
    }

    private fun clearClipboard() {
        val deepClear = sharedPrefs.getBoolean(PreferenceKeys.CLEAR_CLIPBOARD_20X, false)
        val clipboard = clipboard

        if (clipboard != null) {
            scope.launch {
                d { "Clearing the clipboard" }
                val clip = ClipData.newPlainText("pgp_handler_result_pm", "")
                clipboard.setPrimaryClip(clip)
                if (deepClear) {
                    withContext(Dispatchers.IO) {
                        repeat(20) {
                            val count = (it * 500).toString()
                            clipboard.setPrimaryClip(ClipData.newPlainText(count, count))
                        }
                    }
                }
            }
        } else {
            d { "Cannot get clipboard manager service" }
        }
    }

    private suspend fun startTimer(showTime: Int) {
        var current = 0
        while (scope.isActive && current < showTime) {
            // Block for 1s or until cancel is signalled
            current++
            delay(1000)
        }
    }

    private fun createNotification(clearTime: Int) {
        val clearTimeMs = clearTime * 1000L
        val clearIntent = Intent(this, ClipboardService::class.java).apply {
            action = ACTION_CLEAR
        }
        val pendingIntent = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            PendingIntent.getForegroundService(this, 0, clearIntent, PendingIntent.FLAG_UPDATE_CURRENT)
        } else {
            PendingIntent.getService(this, 0, clearIntent, PendingIntent.FLAG_UPDATE_CURRENT)
        }
        val notification = if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
            createNotificationApi23(pendingIntent)
        } else {
            createNotificationApi24(pendingIntent, clearTimeMs)
        }

        createNotificationChannel()
        startForeground(1, notification)
    }

    private fun createNotificationApi23(pendingIntent: PendingIntent): Notification {
        return NotificationCompat.Builder(this, CHANNEL_ID)
            .setContentTitle(getString(R.string.app_name))
            .setContentText(getString(R.string.tap_clear_clipboard))
            .setSmallIcon(R.drawable.ic_action_secure_24dp)
            .setContentIntent(pendingIntent)
            .setUsesChronometer(true)
            .setPriority(NotificationCompat.PRIORITY_LOW)
            .build()
    }

    @RequiresApi(Build.VERSION_CODES.N)
    private fun createNotificationApi24(pendingIntent: PendingIntent, clearTimeMs: Long): Notification {
        return NotificationCompat.Builder(this, CHANNEL_ID)
            .setContentTitle(getString(R.string.app_name))
            .setContentText(getString(R.string.tap_clear_clipboard))
            .setSmallIcon(R.drawable.ic_action_secure_24dp)
            .setContentIntent(pendingIntent)
            .setUsesChronometer(true)
            .setChronometerCountDown(true)
            .setShowWhen(true)
            .setWhen(System.currentTimeMillis() + clearTimeMs)
            .setPriority(NotificationCompat.PRIORITY_LOW)
            .build()
    }

    private fun createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val serviceChannel = NotificationChannel(
                CHANNEL_ID,
                getString(R.string.app_name),
                NotificationManager.IMPORTANCE_LOW
            )
            val manager = getSystemService<NotificationManager>()
            if (manager != null) {
                manager.createNotificationChannel(serviceChannel)
            } else {
                d { "Failed to create notification channel" }
            }
        }
    }

    companion object {

        const val ACTION_START = "ACTION_START_CLIPBOARD_TIMER"
        const val EXTRA_NOTIFICATION_TIME = "EXTRA_NOTIFICATION_TIME"
        private const val ACTION_CLEAR = "ACTION_CLEAR_CLIPBOARD"
        private const val CHANNEL_ID = "NotificationService"
    }
}