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/*
 * Copyright (C) 2021 Square, Inc.
 *
 * 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 okio

import okio.Path.Companion.toPath
import okio.internal.ResourceFileSystem
import okio.internal.commonCopy
import okio.internal.commonCreateDirectories
import okio.internal.commonDeleteRecursively
import okio.internal.commonExists
import okio.internal.commonListRecursively
import okio.internal.commonMetadata

actual abstract class FileSystem {
  @Throws(IOException::class)
  actual abstract fun canonicalize(path: Path): Path

  @Throws(IOException::class)
  actual fun metadata(path: Path): FileMetadata = commonMetadata(path)

  @Throws(IOException::class)
  actual abstract fun metadataOrNull(path: Path): FileMetadata?

  @Throws(IOException::class)
  actual fun exists(path: Path): Boolean = commonExists(path)

  @Throws(IOException::class)
  actual abstract fun list(dir: Path): List

  actual abstract fun listOrNull(dir: Path): List?

  actual open fun listRecursively(dir: Path, followSymlinks: Boolean): Sequence =
    commonListRecursively(dir, followSymlinks)

  fun listRecursively(dir: Path): Sequence = listRecursively(dir, followSymlinks = false)

  @Throws(IOException::class)
  actual abstract fun openReadOnly(file: Path): FileHandle

  @Throws(IOException::class)
  actual abstract fun openReadWrite(file: Path, mustCreate: Boolean, mustExist: Boolean): FileHandle

  @Throws(IOException::class)
  fun openReadWrite(file: Path): FileHandle =
    openReadWrite(file, mustCreate = false, mustExist = false)

  @Throws(IOException::class)
  actual abstract fun source(file: Path): Source

  @Throws(IOException::class)
  @JvmName("-read")
  actual inline fun  read(file: Path, readerAction: BufferedSource.() -> T): T {
    return source(file).buffer().use {
      it.readerAction()
    }
  }

  @Throws(IOException::class)
  actual abstract fun sink(file: Path, mustCreate: Boolean): Sink

  @Throws(IOException::class)
  fun sink(file: Path): Sink = sink(file, mustCreate = false)

  @Throws(IOException::class)
  @JvmName("-write")
  actual inline fun  write(file: Path, mustCreate: Boolean, writerAction: BufferedSink.() -> T): T {
    return sink(file, mustCreate = mustCreate).buffer().use {
      it.writerAction()
    }
  }

  @Throws(IOException::class)
  actual abstract fun appendingSink(file: Path, mustExist: Boolean): Sink

  @Throws(IOException::class)
  fun appendingSink(file: Path): Sink = appendingSink(file, mustExist = false)

  @Throws(IOException::class)
  actual abstract fun createDirectory(dir: Path, mustCreate: Boolean)

  @Throws(IOException::class)
  fun createDirectory(dir: Path) = createDirectory(dir, mustCreate = false)

  @Throws(IOException::class)
  actual fun createDirectories(dir: Path, mustCreate: Boolean): Unit =
    commonCreateDirectories(dir, mustCreate)

  @Throws(IOException::class)
  fun createDirectories(dir: Path): Unit = createDirectories(dir, mustCreate = false)

  @Throws(IOException::class)
  actual abstract fun atomicMove(source: Path, target: Path)

  @Throws(IOException::class)
  actual open fun copy(source: Path, target: Path): Unit = commonCopy(source, target)

  @Throws(IOException::class)
  actual abstract fun delete(path: Path, mustExist: Boolean)

  @Throws(IOException::class)
  fun delete(path: Path) = delete(path, mustExist = false)

  @Throws(IOException::class)
  actual open fun deleteRecursively(fileOrDirectory: Path, mustExist: Boolean): Unit =
    commonDeleteRecursively(fileOrDirectory, mustExist)

  @Throws(IOException::class)
  fun deleteRecursively(fileOrDirectory: Path): Unit =
    deleteRecursively(fileOrDirectory, mustExist = false)

  @Throws(IOException::class)
  actual abstract fun createSymlink(source: Path, target: Path)

  actual companion object {
    /**
     * The current process's host file system. Use this instance directly, or dependency inject a
     * [FileSystem] to make code testable.
     */
    @JvmField
    val SYSTEM: FileSystem = run {
      try {
        Class.forName("java.nio.file.Files")
        return@run NioSystemFileSystem()
      } catch (e: ClassNotFoundException) {
        return@run JvmSystemFileSystem()
      }
    }

    @JvmField
    actual val SYSTEM_TEMPORARY_DIRECTORY: Path = System.getProperty("java.io.tmpdir").toPath()

    /**
     * A read-only file system holding the classpath resources of the current process. If a resource
     * is available with [ClassLoader.getResource], it is also available via this file system.
     *
     * In applications that compose multiple class loaders, this holds only the resources of
     * whichever class loader includes Okio classes. Use [ClassLoader.asResourceFileSystem] for the
     * resources of a specific class loader.
     */
    @JvmField
    val RESOURCES: FileSystem = ResourceFileSystem(
      classLoader = ResourceFileSystem::class.java.classLoader,
      indexEagerly = false,
    )
  }
}