/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.pandora

import android.bluetooth.BluetoothManager
import android.content.ContentProviderOperation
import android.content.ContentValues
import android.content.Context
import android.provider.CallLog
import android.provider.CallLog.Calls.*
import android.provider.ContactsContract
import android.provider.ContactsContract.*
import android.provider.ContactsContract.CommonDataKinds.*
import java.io.Closeable
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.cancel
import pandora.PBAPGrpc.PBAPImplBase
import pandora.PbapProto.*

@kotlinx.coroutines.ExperimentalCoroutinesApi
class Pbap(val context: Context) : PBAPImplBase(), Closeable {
    private val TAG = "PandoraPbap"

    private val scope: CoroutineScope
    private val allowedDigits = ('0'..'9')

    private val bluetoothManager = context.getSystemService(BluetoothManager::class.java)!!
    private val bluetoothAdapter = bluetoothManager.adapter

    init {
        // Init the CoroutineScope
        scope = CoroutineScope(Dispatchers.Default.limitedParallelism(1))
        preparePBAPDatabase()
    }

    private fun preparePBAPDatabase() {
        prepareContactList()
        prepareCallLog()
    }

    private fun prepareContactList() {
        var cursor =
            context
                .getContentResolver()
                .query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null)

        if (cursor == null) return

        if (cursor.getCount() >= CONTACT_LIST_SIZE) return // return if contacts are present

        for (item in cursor.getCount() + 1..CONTACT_LIST_SIZE) {
            addContact(item)
        }
    }

    private fun prepareCallLog() {
        // Delete existing call log
        context.getContentResolver().delete(CallLog.Calls.CONTENT_URI, null, null)

        addCallLogItem(MISSED_TYPE)
        addCallLogItem(OUTGOING_TYPE)
    }

    private fun addCallLogItem(callType: Int) {
        var contentValues =
            ContentValues().apply {
                put(CallLog.Calls.NUMBER, generatePhoneNumber(PHONE_NUM_LENGTH))
                put(CallLog.Calls.DATE, System.currentTimeMillis())
                put(CallLog.Calls.DURATION, if (callType == MISSED_TYPE) 0 else 30)
                put(CallLog.Calls.TYPE, callType)
                put(CallLog.Calls.NEW, 1)
            }
        context.getContentResolver().insert(CallLog.Calls.CONTENT_URI, contentValues)
    }

    private fun addContact(contactIndex: Int) {
        val operations = arrayListOf<ContentProviderOperation>()

        val displayName = String.format(DEFAULT_DISPLAY_NAME, contactIndex)
        val phoneNumber = generatePhoneNumber(PHONE_NUM_LENGTH)
        val emailID = String.format(DEFAULT_EMAIL_ID, contactIndex)
        val note = String.format(DEFAULT_NOTE, contactIndex)

        val rawContactInsertIndex = operations.size
        operations.add(
            ContentProviderOperation.newInsert(RawContacts.CONTENT_URI)
                .withValue(RawContacts.ACCOUNT_TYPE, null)
                .withValue(RawContacts.ACCOUNT_NAME, null)
                .build()
        )

        operations.add(
            ContentProviderOperation.newInsert(Data.CONTENT_URI)
                .withValueBackReference(Data.RAW_CONTACT_ID, rawContactInsertIndex)
                .withValue(Data.MIMETYPE, StructuredName.CONTENT_ITEM_TYPE)
                .withValue(StructuredName.DISPLAY_NAME, displayName)
                .build()
        )

        operations.add(
            ContentProviderOperation.newInsert(Data.CONTENT_URI)
                .withValueBackReference(Data.RAW_CONTACT_ID, rawContactInsertIndex)
                .withValue(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE)
                .withValue(Phone.NUMBER, phoneNumber)
                .withValue(Phone.TYPE, Phone.TYPE_MOBILE)
                .build()
        )

        operations.add(
            ContentProviderOperation.newInsert(Data.CONTENT_URI)
                .withValueBackReference(Data.RAW_CONTACT_ID, rawContactInsertIndex)
                .withValue(Data.MIMETYPE, Email.CONTENT_ITEM_TYPE)
                .withValue(Email.DATA, emailID)
                .withValue(Email.TYPE, Email.TYPE_MOBILE)
                .build()
        )

        operations.add(
            ContentProviderOperation.newInsert(Data.CONTENT_URI)
                .withValueBackReference(Data.RAW_CONTACT_ID, rawContactInsertIndex)
                .withValue(Data.MIMETYPE, Note.CONTENT_ITEM_TYPE)
                .withValue(Note.NOTE, note)
                .build()
        )

        context.getContentResolver().applyBatch(ContactsContract.AUTHORITY, operations)
    }

    private fun generatePhoneNumber(length: Int): String {
        return buildString { repeat(length) { append(allowedDigits.random()) } }
    }

    override fun close() {
        // Deinit the CoroutineScope
        scope.cancel()
    }

    companion object {
        const val DEFAULT_DISPLAY_NAME = "Contact Name %d"
        const val DEFAULT_EMAIL_ID = "user%d@example.com"
        const val CONTACT_LIST_SIZE = 125
        const val PHONE_NUM_LENGTH = 10
        const val DEFAULT_NOTE =
            """
                %d Lorem ipsum dolor sit amet, consectetur adipiscing elit.
                Vivamus condimentum rhoncus est volutpat venenatis.
            """
    }
}