declare var VirtualList;
declare var Mousetrap;

export interface WaveformMeta {
  label : string;
  len : number;
}

export interface WaveformProvider {
  getSignalMetadata() : WaveformMeta[];
  getSignalData(index:number, start:number, len:number) : number[];
}

export class WaveformView {
  parent : HTMLElement;
  wfp : WaveformProvider;
  wavelist;
  meta : WaveformMeta[];
  lines : HTMLCanvasElement[] = [];
  zoom : number = 8;
  t0 : number = 0;
  tsel : number = -1;
  pageWidth : number;
  clocksPerPage : number;
  clockMax : number;
  hexformat : boolean = false;

  constructor(parent:HTMLElement, wfp:WaveformProvider) {
    this.parent = parent;
    this.wfp = wfp;
    this.recreate();
  }

  wtimer;
  recreate() {
    clearTimeout(this.wtimer);
    this.wtimer = setTimeout(() => {
      this.destroy();
      // create new thing
      this._recreate();
    }, 0);
  }
  
  destroy() {
    // remove old thing
    if (this.wavelist) {
      $(this.wavelist.container).remove();
    }
  }
  
  _recreate() {
    this.meta = this.wfp.getSignalMetadata();
    if (!this.meta) return;
    var width = this.pageWidth = $(this.parent).width();
    var rowHeight = 40; // TODO
    this.clocksPerPage = Math.floor(this.pageWidth/this.zoom) - 1;
    this.clockMax = 0;
    this.wavelist = new VirtualList({
      w: width,
      h: $(this.parent).height(),
      itemHeight: rowHeight,
      totalRows: this.meta.length,
      generatorFn: (row : number) => {
        var s = this.meta[row].label;
        var linediv = document.createElement("div");
        var canvas = document.createElement("canvas");
        canvas.width = width - 12;
        canvas.height = rowHeight;
        linediv.appendChild(canvas); //document.createTextNode(s));
        linediv.classList.add('waverow');
        this.lines[row] = canvas;
        this.refreshRow(row);
        return linediv;
      }
    });
    var wlc = this.wavelist.container;
    wlc.tabIndex = -1; // make it focusable
    //wlc.style = "overflow-x: hidden"; // TODO?
    $(this.parent).append(wlc);
    var down = false;
    var selfn = (e) => {
      this.setSelTime(e.offsetX / this.zoom + this.t0 - 0.5);
    };
    $(wlc).mousedown( (e) => {
      down = true;
      selfn(e);
      //if (e['pointerId']) e.target.setPointerCapture(e['pointerId']);
    });
    $(wlc).mousemove( (e) => {
      if (down) selfn(e);
    });
    $(wlc).mouseup( (e) => {
      down = false;
      //if (e['pointerId']) e.target.releasePointerCapture(e['pointerId']);
    });
    Mousetrap(wlc).bind('=', (e,combo) => {
      this.setZoom(this.zoom * 2);
    });
    Mousetrap(wlc).bind('+', (e,combo) => {
      this.setZoom(this.zoom * 2);
    });
    Mousetrap(wlc).bind('-', (e,combo) => {
      this.setZoom(this.zoom / 2);
    });
    Mousetrap(wlc).bind('left', (e,combo) => {
      this.setSelTime(this.tsel - 1);
    });
    Mousetrap(wlc).bind('right', (e,combo) => {
      this.setSelTime(this.tsel + 1);
    });
    Mousetrap(wlc).bind('ctrl+left', (e,combo) => {
      this.setSelTime(this.tsel - this.clocksPerPage/4);
    });
    Mousetrap(wlc).bind('ctrl+right', (e,combo) => {
      this.setSelTime(this.tsel + this.clocksPerPage/4);
    });
    Mousetrap(wlc).bind('ctrl+shift+left', (e,combo) => {
      this.setSelTime(0);
      this.setOrgTime(0);
    });
    Mousetrap(wlc).bind('h', (e,combo) => {
      this.hexformat = !this.hexformat;
      this.refresh();
    });
    $(window).resize(() => {
      this.recreate();
    }); // TODO: remove?
  }
  
  roundT(t : number) {
    t = Math.round(t);
    t = Math.max(0, t); // make sure >= 0
    t = Math.min(this.clockMax + this.clocksPerPage/2, t); // make sure <= end
    return t;
  }
  
  setOrgTime(t : number) {
    this.t0 = this.roundT(t);
    this.refresh();
  }
  
  setEndTime(t : number) {
    this.setOrgTime(t - this.clocksPerPage);
  }
  
  setSelTime(t : number) {
    t = this.roundT(t);
    if (t >= this.t0 + this.clocksPerPage - 1)
      this.t0 += this.clocksPerPage / 4;
    if (t <= this.t0 + 2)
      this.t0 -= this.clocksPerPage / 4;
    this.tsel = t;
    this.setOrgTime(this.t0);
  }
  
  setZoom(zoom : number) {
    this.zoom = Math.max(1, Math.min(64, zoom));
    this.clocksPerPage = Math.ceil(this.pageWidth/this.zoom); // TODO: refactor into other one
    this.refresh();
  }
  
  refresh() {
    if (!this.meta) this.recreate();
    if (!this.meta) return;
    for (var i=0; i<this.meta.length; i++) {
      this.refreshRow(i);
    }
  }

  refreshRow(row : number) {
    var canvas = this.lines[row];
    var meta = this.meta[row];
    if (!canvas || !meta) return;
    var isclk = (meta.label == 'clk');
    var w = canvas.width;
    var h = canvas.height;
    var ctx = canvas.getContext("2d");
    ctx.font = "14px Andale Mono, Lucida Console, monospace";
    // clear to black
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    // draw waveform
    var fh = 12;
    var b1 = fh+4;
    var b2 = 4;
    var h2 = h-b1-b2;
    var yrange = ((1<<meta.len)-1) || 0;
    var data = this.wfp.getSignalData(row, this.t0, Math.ceil(w/this.zoom));
    this.clockMax = Math.max(this.clockMax, this.t0 + data.length);
    var printvals = meta.len > 1 && this.zoom >= 32;
    var ycen = b1+h2-1;
    ctx.fillStyle = "#336633";
    ctx.fillRect(0, fh/2, 3, b1+h2-fh/2); // draw left tag
    ctx.strokeStyle = ctx.fillStyle = "#66ff66";
    // draw waveform
    ctx.beginPath();
    var x = 0;
    var y = 0;
    var lastval = -1;
    var radix = this.hexformat ? 16 : 10;
    for (var i=0; i<data.length; i++) {
      var val = data[i];
      if (printvals && val != lastval && x < w-100) { // close to right edge? omit
        ctx.fillText(val.toString(radix), x+this.zoom/4, ycen);
      }
      lastval = val;
      if (i>0)
        ctx.lineTo(x,y);
      y = b1 + (1.0 - val/yrange) * h2;
      if (!isclk) x += this.zoom*(1/8);
      if (i==0)
        ctx.moveTo(x,y);
      else
        ctx.lineTo(x,y);
      if (isclk)
        x += this.zoom;
      else
        x += this.zoom*(7/8);
    }
    ctx.stroke();
    // draw selection thingie
    if (this.tsel >= this.t0) {
      ctx.strokeStyle = ctx.fillStyle = "#ff66ff";
      ctx.beginPath();
      x = (this.tsel - this.t0)*this.zoom + this.zoom/2;
      ctx.moveTo(x, 0);
      ctx.lineTo(x, h);
      ctx.stroke();
      // print value
      var val = data[this.tsel - this.t0];
      ctx.textAlign = 'right';
      if (val !== undefined) {
        var s = val.toString(radix);
        ctx.fillText(s, w-fh, ycen);
      }
    }
    // draw labels
    ctx.fillStyle = "white";
    ctx.textAlign = "left";
    ctx.fillText(meta.label, 5, fh);
  }
}