/*

 * AboutOss is an utility library to retrieve and display

 * opensource licenses in Android applications.

 *

 * Copyright (C) 2023 by Frederic-Charles Barthelery.

 *

 * This file is part of AboutOss.

 *

 * AboutOss 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.

 *

 * AboutOss 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 AboutOss.  If not, see <http://www.gnu.org/licenses/>.

 */

package com.geekorum.aboutoss.core.licensee

import kotlinx.cinterop.ExperimentalForeignApi

import kotlinx.cinterop.addressOf

import kotlinx.cinterop.usePinned

import kotlinx.coroutines.CoroutineDispatcher

import kotlinx.coroutines.Dispatchers

import kotlinx.coroutines.IO

import okio.Buffer

import platform.Foundation.NSBundle

import platform.Foundation.NSData

import platform.Foundation.NSFileManager

import platform.posix.memcpy

fun LicenseeLicenseInfoRepository(

    licenseeResourcePath: String = "compose-resources/app/cash/licensee/artifacts.json",

    mainCoroutineDispatcher: CoroutineDispatcher = Dispatchers.Main,

    ioCoroutineDispatcher: CoroutineDispatcher = Dispatchers.IO,

): LicenseeLicenseInfoRepository {

    return LicenseeLicenseInfoRepository(

        produceInput = {

            val buffer = Buffer()

            buffer.write(readResources(licenseeResourcePath))

            buffer

        },

        mainCoroutineDispatcher = mainCoroutineDispatcher,

        ioCoroutineDispatcher = ioCoroutineDispatcher

    )

}

@OptIn(ExperimentalForeignApi::class)

private fun readResources(path: String): ByteArray {

    val data = readData(getPathInBundle(path))

    return ByteArray(data.length.toInt()).apply {

        usePinned { memcpy(it.addressOf(0), data.bytes, data.length) }

    }

}

private fun getPathInBundle(path: String): String {

    return NSBundle.mainBundle.resourcePath + "/$path"

}

private fun readData(path: String): NSData {

    return NSFileManager.defaultManager().contentsAtPath(path) ?: error("Resources not found with path $path")

}