/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.daffodil.runtime1.processors.parsers

import java.lang.{ Double => JDouble, Float => JFloat, Long => JLong, Number => JNumber }
import java.math.{ BigDecimal => JBigDecimal, BigInteger => JBigInt }

import org.apache.daffodil.lib.schema.annotation.props.gen.LengthUnits
import org.apache.daffodil.lib.schema.annotation.props.gen.YesNo
import org.apache.daffodil.runtime1.dpath.InvalidPrimitiveDataException
import org.apache.daffodil.runtime1.dpath.NodeInfo
import org.apache.daffodil.runtime1.processors.ElementRuntimeData
import org.apache.daffodil.runtime1.processors.Evaluatable
import org.apache.daffodil.runtime1.processors.ParseOrUnparseState
import org.apache.daffodil.runtime1.processors.Processor

class BinaryFloatParser(override val context: ElementRuntimeData) extends PrimParser {
  override lazy val runtimeDependencies = Vector()

  def parse(start: PState): Unit = {
    val dis = start.dataInputStream

    if (!dis.isDefinedForLength(32)) {
      PENotEnoughBits(start, 32, dis)
      return
    }

    val f: JFloat = dis.getBinaryFloat(start)
    start.simpleElement.overwriteDataValue(f)
  }
}

class BinaryDoubleParser(override val context: ElementRuntimeData) extends PrimParser {
  override lazy val runtimeDependencies = Vector()

  def parse(start: PState): Unit = {
    val dis = start.dataInputStream

    if (!dis.isDefinedForLength(64)) {
      PENotEnoughBits(start, 64, dis)
      return
    }

    val d: JDouble = dis.getBinaryDouble(start)
    start.simpleElement.overwriteDataValue(d)
  }
}

class BinaryDecimalKnownLengthParser(
  e: ElementRuntimeData,
  signed: YesNo,
  binaryDecimalVirtualPoint: Int,
  val lengthInBits: Int,
) extends BinaryDecimalParserBase(e, signed, binaryDecimalVirtualPoint)
  with HasKnownLengthInBits {}

class BinaryDecimalRuntimeLengthParser(
  val e: ElementRuntimeData,
  signed: YesNo,
  binaryDecimalVirtualPoint: Int,
  val lengthEv: Evaluatable[JLong],
  val lengthUnits: LengthUnits,
) extends BinaryDecimalParserBase(e, signed, binaryDecimalVirtualPoint)
  with HasRuntimeExplicitLength {}

class BinaryDecimalPrefixedLengthParser(
  e: ElementRuntimeData,
  override val prefixedLengthParser: Parser,
  override val prefixedLengthERD: ElementRuntimeData,
  signed: YesNo,
  binaryDecimalVirtualPoint: Int,
  override val lengthUnits: LengthUnits,
  override val prefixedLengthAdjustmentInUnits: Long,
) extends BinaryDecimalParserBase(e, signed, binaryDecimalVirtualPoint)
  with PrefixedLengthParserMixin {

  override def childProcessors: Vector[Processor] = Vector(prefixedLengthParser)

  override def getBitLength(state: ParseOrUnparseState): Int = {
    getPrefixedLengthInBits(state.asInstanceOf[PState]).toInt
  }
}

abstract class BinaryDecimalParserBase(
  override val context: ElementRuntimeData,
  signed: YesNo,
  binaryDecimalVirtualPoint: Int,
) extends PrimParser {
  override lazy val runtimeDependencies = Vector()

  protected def getBitLength(s: ParseOrUnparseState): Int

  def parse(start: PState): Unit = {
    val nBits = getBitLength(start)
    val dis = start.dataInputStream
    if (!dis.isDefinedForLength(nBits)) {
      PENotEnoughBits(start, nBits, dis)
      return
    }

    val bigInt: JBigInt =
      if (signed == YesNo.Yes) { dis.getSignedBigInt(nBits, start) }
      else { dis.getUnsignedBigInt(nBits, start) }

    val bigDec = new JBigDecimal(bigInt, binaryDecimalVirtualPoint)
    start.simpleElement.overwriteDataValue(bigDec)
  }
}

class BinaryIntegerRuntimeLengthParser(
  val e: ElementRuntimeData,
  signed: Boolean,
  val lengthEv: Evaluatable[JLong],
  val lengthUnits: LengthUnits,
) extends BinaryIntegerBaseParser(e, signed)
  with HasRuntimeExplicitLength {}

class BinaryIntegerKnownLengthParser(
  e: ElementRuntimeData,
  signed: Boolean,
  val lengthInBits: Int,
) extends BinaryIntegerBaseParser(e, signed)
  with HasKnownLengthInBits {}

class BinaryIntegerPrefixedLengthParser(
  e: ElementRuntimeData,
  override val prefixedLengthParser: Parser,
  override val prefixedLengthERD: ElementRuntimeData,
  signed: Boolean,
  override val lengthUnits: LengthUnits,
  override val prefixedLengthAdjustmentInUnits: Long,
) extends BinaryIntegerBaseParser(e, signed)
  with PrefixedLengthParserMixin {

  override def childProcessors: Vector[Processor] = Vector(prefixedLengthParser)

  override def getBitLength(state: ParseOrUnparseState): Int = {
    getPrefixedLengthInBits(state.asInstanceOf[PState]).toInt
  }
}

abstract class BinaryIntegerBaseParser(
  override val context: ElementRuntimeData,
  signed: Boolean,
) extends PrimParser {
  override lazy val runtimeDependencies = Vector()

  protected def getBitLength(s: ParseOrUnparseState): Int

  private val primNumeric = context.optPrimType.get.asInstanceOf[NodeInfo.PrimType.PrimNumeric]

  def parse(start: PState): Unit = {
    val nBits = getBitLength(start)
    if (nBits == 0) return // zero length is used for outputValueCalc often.
    if (primNumeric.width.isDefined) {
      val width = primNumeric.width.get
      if (nBits > width)
        PE(
          start,
          "Number of bits %d out of range, must be between 1 and %d bits.",
          nBits,
          width,
        )
    }
    val dis = start.dataInputStream
    if (!dis.isDefinedForLength(nBits)) {
      PENotEnoughBits(start, nBits, dis)
      return
    }

    val num: JNumber =
      if (signed) {
        if (nBits > 64) { dis.getSignedBigInt(nBits, start) }
        else { dis.getSignedLong(nBits, start) }
      } else {
        if (nBits >= 64) { dis.getUnsignedBigInt(nBits, start) }
        else { dis.getUnsignedLong(nBits, start).toLong }
      }

    val res =
      try {
        primNumeric.fromNumber(num)
      } catch {
        case e: InvalidPrimitiveDataException => {
          PE(start, "%s", e.getMessage)
          return
        }
      }

    start.simpleElement.overwriteDataValue(res)
  }
}
