/*
 * Copyright 2019 Jeremy Jamet / Kunzisoft.
 *
 * This file is part of KeePassDX.
 *
 *  KeePassDX 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.
 *
 *  KeePassDX 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 KeePassDX.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.kunzisoft.keepass.utils

import android.app.AlarmManager
import android.app.NotificationManager
import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Context.ALARM_SERVICE
import android.content.Intent
import android.content.IntentFilter
import android.os.Build
import android.util.Log
import androidx.core.content.ContextCompat
import com.kunzisoft.keepass.R
import com.kunzisoft.keepass.app.AppLifecycleObserver
import com.kunzisoft.keepass.database.ContextualDatabase
import com.kunzisoft.keepass.credentialprovider.magikeyboard.MagikeyboardService
import com.kunzisoft.keepass.services.ClipboardEntryNotificationService
import com.kunzisoft.keepass.services.KeyboardEntryNotificationService
import com.kunzisoft.keepass.settings.PreferencesUtil
import com.kunzisoft.keepass.timeout.TimeoutHelper
import com.kunzisoft.keepass.utils.UriUtil.releaseAllUnnecessaryPermissionUris

const val DATABASE_START_TASK_ACTION = "com.kunzisoft.keepass.DATABASE_START_TASK_ACTION"
const val DATABASE_STOP_TASK_ACTION = "com.kunzisoft.keepass.DATABASE_STOP_TASK_ACTION"

const val LOCK_ACTION = "com.kunzisoft.keepass.LOCK"
const val REMOVE_ENTRY_MAGIKEYBOARD_ACTION = "com.kunzisoft.keepass.REMOVE_ENTRY_MAGIKEYBOARD"
const val BACK_PREVIOUS_KEYBOARD_ACTION = "com.kunzisoft.keepass.BACK_PREVIOUS_KEYBOARD"

class LockReceiver(private var lockAction: () -> Unit) : BroadcastReceiver() {

    private var mLockPendingIntent: PendingIntent? = null
    var backToPreviousKeyboardAction: (() -> Unit)? = null

    override fun onReceive(context: Context, intent: Intent) {
        // If allowed, lock and exit
        if (!TimeoutHelper.temporarilyDisableLock) {
            intent.action?.let {
                when (it) {
                    Intent.ACTION_SCREEN_ON -> {
                        cancelLockPendingIntent(context)
                    }
                    Intent.ACTION_SCREEN_OFF -> {
                        if (PreferencesUtil.isLockDatabaseWhenScreenShutOffEnable(context)) {
                            val lockPendingIntent = PendingIntent.getBroadcast(context,
                                4575,
                                Intent(intent).apply {
                                    action = LOCK_ACTION
                                },
                                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                                    PendingIntent.FLAG_IMMUTABLE
                                } else {
                                    0
                                }
                            )
                            this.mLockPendingIntent = lockPendingIntent
                            // Launch the effective action after a small time
                            val first: Long = System.currentTimeMillis() + context.getString(R.string.timeout_screen_off).toLong()
                            (context.getSystemService(ALARM_SERVICE) as AlarmManager?)?.let { alarmManager ->
                                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
                                    && !alarmManager.canScheduleExactAlarms()) {
                                    alarmManager.set(
                                        AlarmManager.RTC_WAKEUP,
                                        first,
                                        lockPendingIntent
                                    )
                                } else {
                                    alarmManager.setExact(
                                        AlarmManager.RTC_WAKEUP,
                                        first,
                                        lockPendingIntent
                                    )
                                }
                            }
                        } else {
                            cancelLockPendingIntent(context)
                        }
                    }
                    LOCK_ACTION -> {
                        lockAction.invoke()
                        AppLifecycleObserver.lockBackgroundEvent = false
                        if (PreferencesUtil.isKeyboardPreviousLockEnable(context)) {
                            backToPreviousKeyboardAction?.invoke()
                        } else {}
                    }
                    REMOVE_ENTRY_MAGIKEYBOARD_ACTION -> {
                        lockAction.invoke()
                    }
                    BACK_PREVIOUS_KEYBOARD_ACTION -> {
                        backToPreviousKeyboardAction?.invoke()
                    }
                    else -> {}
                }
            }
        }
    }

    private fun cancelLockPendingIntent(context: Context) {
        mLockPendingIntent?.let { lockPendingIntent ->
            val alarmManager = context.getSystemService(ALARM_SERVICE) as AlarmManager?
            alarmManager?.cancel(lockPendingIntent)
            mLockPendingIntent = null
        }
    }
}

fun Context.registerLockReceiver(lockReceiver: LockReceiver?,
                                 registerKeyboardAction: Boolean = false) {
    lockReceiver?.let {
        ContextCompat.registerReceiver(this, it, IntentFilter().apply {
            addAction(Intent.ACTION_SCREEN_OFF)
            addAction(Intent.ACTION_SCREEN_ON)
            addAction(LOCK_ACTION)
            if (registerKeyboardAction) {
                addAction(REMOVE_ENTRY_MAGIKEYBOARD_ACTION)
                addAction(BACK_PREVIOUS_KEYBOARD_ACTION)
            }
        }, ContextCompat.RECEIVER_EXPORTED)
    }
}

fun Context.unregisterLockReceiver(lockReceiver: LockReceiver?) {
    lockReceiver?.let {
        unregisterReceiver(it)
    }
}

fun Context.closeDatabase(database: ContextualDatabase?) {
    // Stop the Magikeyboard service
    stopService(Intent(this, KeyboardEntryNotificationService::class.java))
    MagikeyboardService.removeEntry(this)

    // Stop the notification service
    stopService(Intent(this, ClipboardEntryNotificationService::class.java))

    Log.i(Context::class.java.name, "Close database after inactivity or manual lock")
    (getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager?)?.apply {
        cancelAll()
    }
    // Clear data
    database?.clearAndClose(this.getBinaryDir())

    // Release not useful URI permission
    applicationContext.releaseAllUnnecessaryPermissionUris()
}
