/*
 * Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
 * SPDX-License-Identifier: GPL-3.0-only
 */
package com.zeapo.pwdstore

import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.app.Service
import android.content.ClipboardManager
import android.content.Intent
import android.content.SharedPreferences
import android.os.Build
import android.os.IBinder
import androidx.core.app.NotificationCompat
import androidx.core.content.getSystemService
import androidx.localbroadcastmanager.content.LocalBroadcastManager
import androidx.preference.PreferenceManager
import com.zeapo.pwdstore.utils.ClipboardUtils
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
import timber.log.Timber

class ClipboardService : Service() {

    private val scope = CoroutineScope(Job() + Dispatchers.Main)
    private val settings: SharedPreferences by lazy { PreferenceManager.getDefaultSharedPreferences(this) }

    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 = try {
                        Integer.parseInt(settings.getString("general_show_time", "45") as String)
                    } catch (e: NumberFormatException) {
                        45
                    }

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

                    createNotification()
                    scope.launch {
                        withContext(Dispatchers.IO) {
                            startTimer(time)
                        }
                        withContext(Dispatchers.Main) {
                            emitBroadcast()
                            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 = settings.getBoolean("clear_clipboard_20x", false)
        val clipboardManager = getSystemService<ClipboardManager>()

        if (clipboardManager is ClipboardManager) {
            scope.launch {
                ClipboardUtils.clearClipboard(clipboardManager, deepClear)
            }
        } else {
            Timber.tag("ClipboardService").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 emitBroadcast() {
        val localBroadcastManager = LocalBroadcastManager.getInstance(this)
        val clearIntent = Intent(ACTION_CLEAR)
        localBroadcastManager.sendBroadcast(clearIntent)
    }

    private fun createNotification() {
        createNotificationChannel()
        val clearIntent = Intent(this, ClipboardService::class.java)
        clearIntent.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 = 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()

        startForeground(1, notification)
    }

    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 {
                Timber.tag("ClipboardService").d("Failed to create notification channel")
            }
        }
    }

    companion object {
        private const val ACTION_CLEAR = "ACTION_CLEAR_CLIPBOARD"
        private const val ACTION_START = "ACTION_START_CLIPBOARD_TIMER"
        private const val CHANNEL_ID = "NotificationService"
    }
}