package BACK

import chisel3._
import chisel3.util._


class FrameHeader extends Bundle{
  val frameLenAim  = UInt(12.W) //帧长度目标
  val frameStyle   = UInt(2.W)  //包类型
}

class SubMsgHeader extends Bundle{
  val subMsg_devIndex = UInt(14.W) // 子报文中设备索引
  val subMsg_style    = UInt(2.W)  // 子报文类型
  val subMsg_address  = UInt(16.W) //子报文地址
  val subMsg_operator = UInt(4.W)  //子报文命令类型
  val subMsg_length   = UInt(12.W) //子报文负载长度
  val subMsg_workCnt  = UInt(16.W) //子报文工作计数
}



class ShareSRAMIO extends Bundle{
  val addr  = Input(UInt(15.W))
  val dataw  = Input( UInt(8.W) )
  val datar  = Output( UInt(8.W) )
  val enw    = Input(Bool())
  val enr    = Input(Bool())
}



class SlaveParserIO extends Module{
  val downIn  = Flipped( Decoupled(new AXIS_Bundle(8)) )
  val downOut = Decoupled(new AXIS_Bundle(8))

  val upIn  = Flipped( Decoupled(new AXIS_Bundle(8)) )
  val upOut = Decoupled(new AXIS_Bundle(8))

  val sram_r = for( 0 until 2 ) yield { Flipped(new ShareSRAMIO) }
  val sram_w = for( 0 until 2 ) yield { Flipped(new ShareSRAMIO) }
}

abstract class SlaveParserBase extends Module{
  val io: SlaveParserIO = IO(new SlaveParserIO)



  val devIndex = Reg(UInt(14.W)) //当前设备索引


  val downRecParser = Module(new SlaveRecParser)
  val upRecParser   = Module(new SlaveRecParser)

  val downSendGen = Module(new SlaveSendGen)
  val upSendGen   = Module(new SlaveSendGen)


  val downRecFifo = for( i <- 0 until 2 ) yield { Module(new Queue(UInt(8.W), 8)) }
  val upRecFifo   = for( i <- 0 until 2 ) yield { Module(new Queue(UInt(8.W), 8)) }


  val downSinkSel = Reg(Bool())
  val upSinkSel = Reg(Bool())

  val downFrameInfo  = Reg(new FrameHeader)
  val downSubMsgInfo = for( 0 until 2 ) yield { Reg(new SubMsgHeader) }

  val upFrameInfo  = Reg(new FrameHeader)
  val upSubMsgInfo = for( 0 until 2 ) yield { Reg(new SubMsgHeader) }

  val isDownSendBusy = downRecParser.io.frameReq.ready
  val isUpSendBusy   = upRecParser.io.frameReq.ready

  val isDownSendPend = RegInit(false.B)
  val isUpSendPend = RegInit(false.B)


  //同时到来怎么办
  when( downRecParser.io.frameReq.fire ){
    when(downRecParser.io.frameReq.bits.frameStyle === FRAME_STYLE_PROBE){ //下行来了一个嗅探包
      isUpSendPend := true.B
      downFrameInfo := downRecParser.io.frameReq.bits
      println("Warning! No busy protection!")
    } .elsewhen( downRecParser.io.frameReq.bits.frameStyle === FRAME_STYLE_COMMON ){ //下行来了一个普通包
      isDownSendPend := true.B
      downFrameInfo := downRecParser.io.frameReq.bits
      println("Warning! No busy protection!")
    }
  } .elsewhen( upRecParser.io.frameReq.fire ){
    when( upRecParser.io.frameReq.bits.frameStyle === FRAME_STYLE_PROBE){ //上行来了一个嗅探包
      println("Probe Resp!")
    } .elsewhen( upRecParser.io.frameReq.bits.frameStyle === FRAME_STYLE_COMMON ){ //上行来了一个普通包
      isUpSendPend := true.B
      upFrameInfo := upRecParser.io.frameReq.bits
      println("Warning! No busy protection!")
    }
  }


  val isDownSendProbe: Bool //下行探针
  val isUpSendProbe: Bool   //上行探针
  val probeFrame: FrameHeader //固定化探针内容

  downSendGen.io.frameReq.valid :=
    isDownSendPend | isDownSendProbe //下行转发 | 下行探针

  assert( OneHot(isDownSendPend, isDownSendProbe) )

  downSendGen.io.frameReq.bits  := Mux1H(Seq(
    isDownSendPend -> downFrameInfo,  //下行转发
    isDownSendProbe -> probeFrame, //下行探针
  ))
  

  when( downSendGen.io.frameReq.fire ){
    isDownSendPend := false.B
  }

  upSendGen.io.frameReq.valid :=
    isUpSendPend | isUpSendProbe  //上行转发 | 上行探针

  assert( OneHot(isUpSendPend, isUpSendProbe) )

  upSendGen.io.frameReq.bits := Mux1H(Seq(
    isUpSendPend -> upFrameInfo, //上行转发
    isUpSendProbe -> probeFrame, //上行探针
  ))


  when( upSendGen.io.frameReq.fire ){
    isUpSendPend := false.B
  }

  when( downSendGen.io.frameReq.fire ){
    isDownSendPend := false.B
  }










  upSendFifo.io.enq.bits := Mux1H(Seq(
    ( downRecParser.io.frameStyle === FRAME_STYLE_PROBE & downRecParser.io.stateCurr > STATE_HEADER ) -> downRecParser.io.data.bits //嗅探包 bypass到上行

  
  ))

  upSendFifo.io.enq.valid :=
    ((downRecParser.io.frameStyle === FRAME_STYLE_PROBE & downRecParser.io.stateCurr > STATE_HEADER ) & downRecParser.io.data.valid) |

  downRecParser.io.data.ready :=
    ((downRecParser.io.frameStyle === FRAME_STYLE_PROBE & downRecParser.io.stateCurr > STATE_HEADER ) & upSendFifo.io.enq.ready ) |


  downSendFifo.io.enq.bits := Mux1H(Seq(
    ( downRecParser.io.frameStyle === FRAME_STYLE_COMMON & downRecParser.io.stateCurr > STATE_HEADER ) -> 
  ))



  val isDownIdle
  val isDownBypassToDown
  val isDownWriteToSRAM
  val isDownReadFromSRAM
  val isDownLoopBack

  val isUpIdle
  val isUpBypassToUp
  val isUpWriteToSRAM
  val isUpReadFromSRAM
  val isUpBlackHole







  // val downOutFifo = Module(new Queue(UInt(8.W), 8))
  val upInFifo    = Module(new Queue(UInt(8.W), 8))
  // val upOutFifo   = Module(new Queue(UInt(8.W), 8))


  downInFifo.io.enq <> io.downIn

  io.downOut.valid :=
    ( === FRAME_STYLE_COMMON ) &

  io.upOut.valid := 
    ( === FRAME_STYLE_PROBE) & |

  io.upOut.bits := 
    Mux1H(Seq(
      ( === FRAME_STYLE_PROBE) -> downInFifo.io.deq.bits, //嗅探包情形
        -> upInFifo.io.deq.bits,   //上行
        ->                         //上行修正数据
    ))
  
  io.downOut.bits := 
    Mux1H(Seq(
           -> //自主发送嗅探包
      (  ) -> downInFifo.io.deq.bits, //下行
      (  ) ->                         //下行修正数据
    ))
   



  downInFifo.io.deq.ready := 
  upInFifo.io.deq.ready := 






































}





class SlaveParser extends SlaveParserBase{

}