/**************************************************************************/
/*  MediaStoreData.kt                                                     */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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package org.godotengine.godot.io.file

import android.content.ContentUris
import android.content.ContentValues
import android.content.Context
import android.database.Cursor
import android.net.Uri
import android.os.Build
import android.os.Environment
import android.os.ParcelFileDescriptor
import android.provider.MediaStore
import android.util.Log
import androidx.annotation.RequiresApi

import java.io.File
import java.io.FileInputStream
import java.io.FileNotFoundException
import java.io.FileOutputStream
import java.io.IOException
import java.nio.channels.FileChannel


/**
 * Implementation of [DataAccess] which handles access and interactions with file and data
 * under scoped storage via the MediaStore API.
 */
@RequiresApi(Build.VERSION_CODES.Q)
internal class MediaStoreData(context: Context, private val filePath: String, accessFlag: FileAccessFlags) :
	DataAccess.FileChannelDataAccess(filePath) {

	private data class DataItem(
		val id: Long,
		val uri: Uri,
		val displayName: String,
		val relativePath: String,
		val size: Int,
		val dateModified: Int,
		val mediaType: Int
	)

	companion object {
		private val TAG = MediaStoreData::class.java.simpleName

		private val COLLECTION = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)

		private val PROJECTION = arrayOf(
			MediaStore.Files.FileColumns._ID,
			MediaStore.Files.FileColumns.DISPLAY_NAME,
			MediaStore.Files.FileColumns.RELATIVE_PATH,
			MediaStore.Files.FileColumns.SIZE,
			MediaStore.Files.FileColumns.DATE_MODIFIED,
			MediaStore.Files.FileColumns.MEDIA_TYPE,
		)

		private const val SELECTION_BY_PATH = "${MediaStore.Files.FileColumns.DISPLAY_NAME} = ? " +
			" AND ${MediaStore.Files.FileColumns.RELATIVE_PATH} = ?"

		private fun getSelectionByPathArguments(path: String): Array<String> {
			return arrayOf(getMediaStoreDisplayName(path), getMediaStoreRelativePath(path))
		}

		private const val SELECTION_BY_ID = "${MediaStore.Files.FileColumns._ID} = ? "

		private fun getSelectionByIdArgument(id: Long) = arrayOf(id.toString())

		private fun getMediaStoreDisplayName(path: String) = File(path).name

		private fun getMediaStoreRelativePath(path: String): String {
			val pathFile = File(path)
			val environmentDir = Environment.getExternalStorageDirectory()
			var relativePath = (pathFile.parent?.replace(environmentDir.absolutePath, "") ?: "").trim('/')
			if (relativePath.isNotBlank()) {
				relativePath += "/"
			}
			return relativePath
		}

		private fun queryById(context: Context, id: Long): List<DataItem> {
			val query = context.contentResolver.query(
				COLLECTION,
				PROJECTION,
				SELECTION_BY_ID,
				getSelectionByIdArgument(id),
				null
			)
			return dataItemFromCursor(query)
		}

		private fun queryByPath(context: Context, path: String): List<DataItem> {
			val query = context.contentResolver.query(
				COLLECTION,
				PROJECTION,
				SELECTION_BY_PATH,
				getSelectionByPathArguments(path),
				null
			)
			return dataItemFromCursor(query)
		}

		private fun dataItemFromCursor(query: Cursor?): List<DataItem> {
			query?.use { cursor ->
				cursor.count
				if (cursor.count == 0) {
					return emptyList()
				}
				val idColumn = cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns._ID)
				val displayNameColumn =
					cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DISPLAY_NAME)
				val relativePathColumn =
					cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.RELATIVE_PATH)
				val sizeColumn = cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.SIZE)
				val dateModifiedColumn =
					cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATE_MODIFIED)
				val mediaTypeColumn = cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.MEDIA_TYPE)

				val result = ArrayList<DataItem>()
				while (cursor.moveToNext()) {
					val id = cursor.getLong(idColumn)
					result.add(
						DataItem(
							id,
							ContentUris.withAppendedId(COLLECTION, id),
							cursor.getString(displayNameColumn),
							cursor.getString(relativePathColumn),
							cursor.getInt(sizeColumn),
							cursor.getInt(dateModifiedColumn),
							cursor.getInt(mediaTypeColumn)
						)
					)
				}
				return result
			}
			return emptyList()
		}

		private fun addFile(context: Context, path: String): DataItem? {
			val fileDetails = ContentValues().apply {
				put(MediaStore.Files.FileColumns._ID, 0)
				put(MediaStore.Files.FileColumns.DISPLAY_NAME, getMediaStoreDisplayName(path))
				put(MediaStore.Files.FileColumns.RELATIVE_PATH, getMediaStoreRelativePath(path))
			}

			context.contentResolver.insert(COLLECTION, fileDetails) ?: return null

			// File was successfully added, let's retrieve its info
			val infos = queryByPath(context, path)
			if (infos.isEmpty()) {
				return null
			}

			return infos[0]
		}

		fun delete(context: Context, path: String): Boolean {
			val itemsToDelete = queryByPath(context, path)
			if (itemsToDelete.isEmpty()) {
				return false
			}

			val resolver = context.contentResolver
			var itemsDeleted = 0
			for (item in itemsToDelete) {
				itemsDeleted += resolver.delete(item.uri, null, null)
			}

			return itemsDeleted > 0
		}

		fun fileExists(context: Context, path: String): Boolean {
			return queryByPath(context, path).isNotEmpty()
		}

		fun fileLastModified(context: Context, path: String): Long {
			val result = queryByPath(context, path)
			if (result.isEmpty()) {
				return 0L
			}

			val dataItem = result[0]
			return dataItem.dateModified.toLong() / 1000L
		}

		fun fileSize(context: Context, path: String): Long {
			val result = queryByPath(context, path)
			if (result.isEmpty()) {
				return -1L
			}

			val dataItem = result[0]
			return dataItem.size.toLong()
		}

		fun rename(context: Context, from: String, to: String): Boolean {
			// Ensure the source exists.
			val sources = queryByPath(context, from)
			if (sources.isEmpty()) {
				return false
			}

			// Take the first source
			val source = sources[0]

			// Set up the updated values
			val updatedDetails = ContentValues().apply {
				put(MediaStore.Files.FileColumns.DISPLAY_NAME, getMediaStoreDisplayName(to))
				put(MediaStore.Files.FileColumns.RELATIVE_PATH, getMediaStoreRelativePath(to))
			}

			val updated = context.contentResolver.update(
				source.uri,
				updatedDetails,
				SELECTION_BY_ID,
				getSelectionByIdArgument(source.id)
			)
			return updated > 0
		}

	}

	private val id: Long
	private val uri: Uri
	override val fileChannel: FileChannel
	private val parcelFileDescriptor: ParcelFileDescriptor

	init {
		val contentResolver = context.contentResolver
		val dataItems = queryByPath(context, filePath)

		val dataItem = when (accessFlag) {
			FileAccessFlags.READ -> {
				// The file should already exist
				if (dataItems.isEmpty()) {
					throw FileNotFoundException("Unable to access file $filePath")
				}

				val dataItem = dataItems[0]
				dataItem
			}

			FileAccessFlags.WRITE, FileAccessFlags.READ_WRITE, FileAccessFlags.WRITE_READ -> {
				// Create the file if it doesn't exist
				val dataItem = if (dataItems.isEmpty()) {
					addFile(context, filePath)
				} else {
					dataItems[0]
				}

				if (dataItem == null) {
					throw FileNotFoundException("Unable to access file $filePath")
				}
				dataItem
			}
		}

		id = dataItem.id
		uri = dataItem.uri

		parcelFileDescriptor = contentResolver.openFileDescriptor(uri, accessFlag.getMode())
			?: throw IllegalStateException("Unable to access file descriptor")
		fileChannel = if (accessFlag == FileAccessFlags.READ) {
			FileInputStream(parcelFileDescriptor.fileDescriptor).channel
		} else {
			FileOutputStream(parcelFileDescriptor.fileDescriptor).channel
		}

		if (accessFlag.shouldTruncate()) {
			fileChannel.truncate(0)
		}
	}

	override fun close() {
		try {
			fileChannel.close()
		} catch (e: IOException) {
			Log.w(TAG, "Exception when closing file $filePath.", e)
		} finally {
			try {
				parcelFileDescriptor.close()
			} catch (e: IOException) {
				Log.w(TAG, "Exception when closing ParcelFileDescriptor for $filePath.", e)
			}
		}
	}
}
