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/*
  Rapture, version 2.0.0. Copyright 2010-2016 Jon Pretty, Propensive Ltd.

  The primary distribution site is
  
    http://rapture.io/

  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 rapture.io
import rapture.core._
import rapture.mime._

import scala.collection.mutable.ListBuffer

case class Multipart(data: Array[Byte], headers: Map[String, String]) {
  def contentType: Option[MimeTypes.MimeType] =
    headers.get("Content-Type") map {
      case MimeTypes(t) => t
      case t => MimeTypes.MimeType(t)
    }

  lazy val contentDisposition: Option[(String, Map[String, String])] =
    headers.get("Content-Disposition") flatMap { v =>
      v.split("; *").to[List] match {
        case h :: t =>
          val m = t.map({ a =>
            val b = a.split("=")
            b(0) -> b(1)
          }).toMap
          Some(h -> m)
        case _ => None
      }
    }

  def filename: Option[String] = contentDisposition flatMap { case (_, m) => m.get("filename") }

  def name: Option[String] = contentDisposition flatMap { case (_, m) => m.get("name") }

  def disposition: Option[String] = contentDisposition.map(_._1)

}

class MultipartReader(boundary: String, in: java.io.InputStream, val sizeLimit: Int = 160)
    extends Input[Multipart] {
  
  private val bnd = ("--"+boundary).getBytes("ASCII")
  
  private var finished = false
  private var cued = next()

  def close(): Unit = in.close()
  def ready(): Boolean = cued.isDefined
  def read(): Option[Multipart] = {
    val r = cued
    cued = next()
    r
  }

  private def next(): Option[Multipart] = {
    
    var buf: Array[Byte] = null
    var count = -1
    val bufs = alloc[ListBuffer[Array[Byte]]]()

    var headers: Map[String, String] = Map()
    var dataStart = 0
    var boundmatch: Int = 0

    while(!finished) {
      var cur = in.read()
      
      if(buf != null && dataStart == 0 && (buf(count%65536) == 10 && cur == 13 ||
          buf(count%65536) == 13 && cur == 10)) {
        // do nothing
      } else if(buf != null && dataStart == 0 && (cur == 10 || cur == 13 &&
          buf(count%65536) == cur)) {
        dataStart = count + 1
        val next = in.read().toByte
        if(next != 10 && next != 13) {
          count += 1
          buf(count%65536) = next
        }
        headers = alloc[String](buf.slice(1, dataStart), "ISO-8859-1").split("\r").map({ h =>
          val i = h.indexOf(':')
          h.substring(0, i) -> h.substring(i + 2, h.length)
        }).toMap
      } else {
        count += 1
        
        if(cur == -1) {
          finished = true
          return None
        }
        
        if(count%65536 == 0) {
          if(count > sizeLimit) throw alloc[RuntimeException]("Upload size limit exceeded.")
          buf = alloc(65536)
          bufs += buf
        }
        
        buf(count%65536) = cur.toByte
        
        boundmatch = if(buf(count%65536) == bnd(boundmatch)) boundmatch + 1 else 0
        
        if(boundmatch == bnd.length) {
          val dataEnd = count - boundmatch - 1
          val size = dataEnd - dataStart
          
          if(size >= 0) {
            val res: Array[Byte] = alloc(size)
            var done = 0
            var i = 0
            var offset = dataStart
            while(done < size) {
              val chunk = List(65536 - offset, size - done).min
              System.arraycopy(bufs(i), offset, res, done, chunk)
              done += chunk
              offset = 0
              i += 1
            }
            
            return Some(Multipart(res, headers))
          } else {
            count = -1
            bufs.clear()
            buf = null
            boundmatch = 0
            dataStart = 0
          }
        }
      }
    }
    None
  }
}