/*
 * Copyright (C) 2015 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.internal.HashFunction
import okio.internal.commonEquals
import okio.internal.commonGetSize
import okio.internal.commonHashCode
import okio.internal.commonInternalGet
import okio.internal.commonRangeEquals
import okio.internal.commonSubstring
import okio.internal.commonToByteArray
import okio.internal.commonWrite
import okio.internal.forEachSegment

internal actual class SegmentedByteString internal actual constructor(
  internal actual val segments: Array<ByteArray>,
  internal actual val directory: IntArray
) : ByteString(EMPTY.data) {

  override fun base64() = toByteString().base64()

  override fun hex() = toByteString().hex()

  override fun toAsciiLowercase() = toByteString().toAsciiLowercase()

  override fun toAsciiUppercase() = toByteString().toAsciiUppercase()

  override fun base64Url() = toByteString().base64Url()

  override fun substring(beginIndex: Int, endIndex: Int): ByteString =
    commonSubstring(beginIndex, endIndex)

  override fun internalGet(pos: Int): Byte = commonInternalGet(pos)

  override fun getSize() = commonGetSize()

  override fun toByteArray(): ByteArray = commonToByteArray()

  override fun write(buffer: Buffer, offset: Int, byteCount: Int): Unit =
    commonWrite(buffer, offset, byteCount)

  override fun rangeEquals(
    offset: Int,
    other: ByteString,
    otherOffset: Int,
    byteCount: Int
  ): Boolean = commonRangeEquals(offset, other, otherOffset, byteCount)

  override fun rangeEquals(
    offset: Int,
    other: ByteArray,
    otherOffset: Int,
    byteCount: Int
  ): Boolean = commonRangeEquals(offset, other, otherOffset, byteCount)

  override fun indexOf(other: ByteArray, fromIndex: Int) = toByteString().indexOf(other, fromIndex)

  override fun lastIndexOf(other: ByteArray, fromIndex: Int) = toByteString().lastIndexOf(
    other,
    fromIndex
  )

  override fun digest(hashFunction: HashFunction): ByteString {
    forEachSegment { data, offset, byteCount ->
      hashFunction.update(data, offset, byteCount)
    }
    val digestBytes = hashFunction.digest()
    return ByteString(digestBytes)
  }

  /** Returns a copy as a non-segmented byte string.  */
  private fun toByteString() = ByteString(toByteArray())

  override fun internalArray() = toByteArray()

  override fun equals(other: Any?): Boolean = commonEquals(other)

  override fun hashCode(): Int = commonHashCode()

  override fun toString() = toByteString().toString()
}