var curb=""
var whiteturn = ">"
var blackturn = "<"

var blackbottom = "bb"
var whitebottom = "wb"
var bottomcolor = whitebottom


function forsythtoplain(aa) {
// e.g. aa = "r1bqkbnr;pppp1ppp;2n5;1B2p4;4P3;5N2;PPPP1PPP;RNBQKB1R;>"
  aa = new String (aa)

  res=""
  
  thelen=aa.length
  for (i=0;i<thelen;i++) {
    cc=aa.charAt(i)
//    alert ( 'piece ' + i + ' = ' + cc )
    res += forsythtoplain1char(cc)
  }
// e.g. res = "rxbqkbnr;ppppxppp;xxnxxxxx;xBxxpxxxx;"
//          +"xxxxPxxx;xxxxxNxx;PPPPxPPP;RNBQKBxR;>"

  return res
}

function forsythtoplain1char(cc) {
// e.g. cc = "r", "n", "b", "3"
  res=""

  if (cc=="<") {return cc}
  if (cc==">") {return cc}

  if (cc==".") {return cc}
  if (cc=="x") {return cc}
  if (cc=="m") {return cc}

  if (cc=="r") {return cc}
  if (cc=="n") {return cc}
  if (cc=="b") {return cc}
  if (cc=="q") {return cc}
  if (cc=="k") {return cc}
  if (cc=="p") {return cc}

  if (cc=="R") {return cc}
  if (cc=="N") {return cc}
  if (cc=="B") {return cc}
  if (cc=="Q") {return cc}
  if (cc=="K") {return cc}
  if (cc=="P") {return cc}

  if (cc=="1") {return "x"}
  if (cc=="2") {return "xx"}
  if (cc=="3") {return "xxx"}
  if (cc=="4") {return "xxxx"}
  if (cc=="5") {return "xxxxx"}
  if (cc=="6") {return "xxxxxx"}
  if (cc=="7") {return "xxxxxxx"}
  if (cc=="8") {return "xxxxxxxx"}
  
  return ""
}

function putpiece (i,cc) {
// e.g.  putpiece (5,"k") {
  
//  alert ( 'putpiece ' + i + ' = ' + cc )

  res = ""
  
  if (false) {

  } else if (cc==">") { res += "wk"
  } else if (cc=="<") { res += "bk"

  } else if (cc=="x") { res += "mt"
  } else if (cc=="m") { res += "mt"
  } else if (cc==".") { res += "mt"

  } else if (cc=="r") { res += "br"
  } else if (cc=="n") { res += "bn"
  } else if (cc=="b") { res += "bb"
  } else if (cc=="q") { res += "bq"
  } else if (cc=="k") { res += "bk"
  } else if (cc=="p") { res += "bp"

  } else if (cc=="R") { res += "wr"
  } else if (cc=="N") { res += "wn"
  } else if (cc=="B") { res += "wb"
  } else if (cc=="Q") { res += "wq"
  } else if (cc=="K") { res += "wk"
  } else if (cc=="P") { res += "wp"

  } else {}
  
  
  if (false) {

  } else if (i==64 && cc==">") {
    res += "_l"
  } else if (i==64 && cc=="<") {
    res += "_d"
  } else if (iswhite(i)) {
    res += "_l"
  } else {
    res += "_d"
  }

  document.images[i].src=giffile(res)

  return true

}

function iswhite(i) {

  rowstart = (mydiv(i,8) % 2)
  field = i % 2

  return (rowstart == field)

}

function mydiv(i,x) {
  iclean = i - (i%x)
  idivx = iclean / x
  return idivx
}

function domakemove( fromftof , updatecurb ) {

// ---------------------------------------------
// -- curb: the board
// -- fromftof: "d2d4"
// ---------------------------------------------
  
  fromf = ""
  fromf += fromftof.charAt(0)
  fromf += fromftof.charAt(1)

  tof = ""
  tof += fromftof.charAt(2)
  tof += fromftof.charAt(3)

  return makemove(curb,fromf,tof,updatecurb)
}

function makemove( bb, fromf, tof , updatecurb ) {

// ---------------------------------------------
// -- bb: the board
// -- fromf: move from field (number 0-63)
// -- tof: move to field
// ---------------------------------------------

//  alert ( 'makemove ' + bb + "\n" + fromf + ", " + tof )
  turnnumber = 64
  turn = bb.charAt(turnnumber)

  fromf = fieldtonumber(fromf)
  tof = fieldtonumber(tof)
  piece = bb.charAt(fromf)
//  alert ( bb + "\n char " + fromf + " = " + piece)


  bb = replacepiece ( bb, tof, piece )
  bb = replacepiece ( bb, fromf, "x" )
  bb = replacepiece ( bb, turnnumber, switchturn(turn) )
  
//  alert ( "makemove res = " + bb )    
  
  if (updatecurb) {curb = bb}
  return bb
}

function fieldtonumber ( ff ) {

// ---------------------------------------------
// -- ff: "e2" (e.g.)
// ---------------------------------------------
  
//alert ( 'fieldtonumber: ' + ff )

  theline = ff.charAt(0)
  therow = ff.charAt(1)

//  alert ( 'line ' + theline + " row " + therow )

  if (therow=="8") {res = 0}
  if (therow=="7") {res = 8}
  if (therow=="6") {res = 16}
  if (therow=="5") {res = 24}
  if (therow=="4") {res = 32}
  if (therow=="3") {res = 40}
  if (therow=="2") {res = 48}
  if (therow=="1") {res = 56}
  
  if (theline=="a") {res += 0}
  if (theline=="b") {res += 1}
  if (theline=="c") {res += 2}
  if (theline=="d") {res += 3}
  if (theline=="e") {res += 4}
  if (theline=="f") {res += 5}
  if (theline=="g") {res += 6}
  if (theline=="h") {res += 7}

//alert ( 'fieldtonumber-res: ' + res )
  
  return res
  
}

function replacepiece ( bb, ii, piece ) {

// ---------------------------------------------
// -- bb: the board
// -- ff: field (number 0-63)
// -- piece: e.g. "r" = rook
// ---------------------------------------------

//  alert ( "replacepiece: " + piece )  
  
  res = replacestringpos(bb,ii,ii+1,piece)

//  alert ( "replacepiece res = " + res )  

  return res
  
}

function switchturn ( turn ) {

// ---------------------------------------------
// -- turn = blackturn/whiteturn
// ---------------------------------------------

  if (turn==whiteturn) {
    return blackturn
  } else {
    return whiteturn
  }

}

function replacestringpos ( ss, ii, jj, tt ) {

// ---------------------------------------------
// -- bb: the string
// -- ii: start of substring to be replaced
// -- jj: first char after substring to be replaced
// -- tt: replace string
// ---------------------------------------------

//  alert ( "replacestringpos: " + ss + "\n" + ii + ", "  + jj + ", "  + tt )  
  
  res = ""
  res += ss.substring(0,ii)
  res += tt
  res += ss.substring(jj,ss.length)
  
//  alert ( 'result: ' + res )

  return res
  
}




function initpos() {
  return ( 
      "rnbqkbnr;"
    + "pppppppp;"
    + "8;"
    + "8;"
    + "8;"
    + "8;"
    + "PPPPPPPP;"
    + "RNBQKBNR;>"
    )
}


var curb=forsythtoplain(initpos())

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