/* This module contains javascript needed to render timeline graphs in Fossil.
**
** There can be multiple graphs on a single webpage, but this script is only
** loaded once.  
**
** Prior to sourcing this script, there should be a separate
** <script type='application/json' id='timeline-data-NN'> for each graph,
** each containing JSON like this:
**
**   { "iTableId": INTEGER,         // Table sequence number (NN)
**     "circleNodes": BOOLEAN,      // True for circle nodes. False for squares

**        and a thin merge-arrow descender is drawn to the bottom of
**        the screen. This array is omitted if there are no inbound
**        merges.
**   ci:  "cherrypick-in". Like "mi" except for cherrypick merges.
**        omitted if there are no cherrypick merges.
**    h:  The artifact hash of the object being graphed
*/

/* The amendCss() function does a one-time change to the CSS to account
** for the "circleNodes" and "showArrowheads" settings.  Do this change
** only once, even if there are multiple graphs being rendered.
*/
var amendCssOnce = 1; // Only change the CSS one time
function amendCss(circleNodes,showArrowheads){
  if( !amendCssOnce ) return;
  var css = "";
  if( circleNodes ){
    css += ".tl-node, .tl-node:after { border-radius: 50%; }";
  }
  if( !showArrowheads ){
    css += ".tl-arrow.u { display: none; }";
  }
  if( css!=="" ){
    var style = document.createElement("style");
    style.textContent = css;
    document.querySelector("head").appendChild(style);
  }
  amendCssOnce = 0;
}

/* The <span> object that holds the tooltip */
var tooltipObj = document.createElement("span");
tooltipObj.className = "tl-tooltip";
tooltipObj.style.display = "none";
document.getElementsByClassName("content")[0].appendChild(tooltipObj);
/* Clear the close timer if the mouse is over the tooltip. */
tooltipObj.onmouseenter = function(e) {
tooltipObj.onmouseenter = function(){stopCloseTimer();}
  stopCloseTimer();
};
/* Init the close timer if the mouse is no longer over the tooltip. */
tooltipObj.onmouseleave = function(e) {
  if (tooltipInfo.ixActive != -1)
tooltipObj.onmouseleave = function(){
  if (tooltipInfo.ixActive != -1) resumeCloseTimer();
    resumeCloseTimer();
};

/* This object must be in the global scope, so that (non-shadowed) access is
** possible from within a setTimeout() closure. */
/* State information for the tooltip popup and its timers */
window.tooltipInfo = {
  dwellTimeout: 250,  /* The tooltip dwell timeout. */
  closeTimeout: 3000, /* The tooltip close timeout. */
  idTimer: 0,         /* The tooltip dwell timer id. */
  idTimerClose: 0,    /* The tooltip close timer id. */
  ixHover: -1,        /* The id of the element with the mouse. */
  ixActive: -1,       /* The id of the element with the tooltip. */
  posX: 0, posY: 0    /* The last mouse position. */
};


/* Functions used to control the tooltip popup and its timer */
function hideGraphTooltip(){
  stopCloseTimer();
  tooltipObj.style.display = "none";
  tooltipInfo.ixActive = -1;
}
function stopDwellTimer(){
  if (tooltipInfo.idTimer != 0) {

function stopCloseTimer(){
  if (tooltipInfo.idTimerClose != 0) {
    clearTimeout(tooltipInfo.idTimerClose);
    tooltipInfo.idTimerClose = 0;
  }
}

/* Construct that graph corresponding to the timeline-data-N object */
/* Construct that graph corresponding to the timeline-data-N object that
** is passed in by the tx parameter */
function TimelineGraph(tx){
  var topObj = document.getElementById("timelineTable"+tx.iTableId);
  amendCss(tx.circleNodes, tx.showArrowheads);
  tooltipInfo.dwellTimeout = tx.dwellTimeout
  tooltipInfo.closeTimeout = tx.closeTimeout
  topObj.onclick = clickOnGraph
  topObj.ondblclick = dblclickOnGraph

      if(-1==tooltipInfo.ixHover && ix==tooltipInfo.ixActive) isReentry = true;
    }
    /* The tooltip is either not visible, or the mouse is over a different
    ** element, so clear the dwell timer, and record the new element id and
    ** mouse position. */
    stopDwellTimer();
    if(ix >= 0){
      if(!isReentry){
      /* Close the tooltip only if the mouse is over another element, and init
        /* Close existing tooltip only if the mouse is over a different element */
      ** the dwell timer again. */
      if(!isReentry) hideGraphTooltip();
        hideGraphTooltip();
      }
      tooltipInfo.ixHover = ix;
      tooltipInfo.posX = e.x;
      tooltipInfo.posY = e.y;
      /* Clear the close timer, if not already cleared by hideGraphTooltip(). */
      stopCloseTimer();
      if (!isReentry && tooltipInfo.dwellTimeout>0) {
        tooltipInfo.idTimer = setTimeout(function() {
          tooltipInfo.idTimer = 0;
          /* Clear the timer to hide the tooltip. */
          stopCloseTimer();
          showGraphTooltip(tooltipInfo.ixHover,
          showGraphTooltip();
                           tooltipInfo.posX,tooltipInfo.posY);
          tooltipInfo.ixActive = tooltipInfo.ixHover;
        },tooltipInfo.dwellTimeout);
      }
    }
    else {
      tooltipInfo.ixHover = -1;
      /* The mouse is not over an element with a tooltip, init the hide
      ** timer. */
      /* The mouse is not over an element with a tooltip */
      tooltipInfo.ixHover = -1;
      resumeCloseTimer();
    }
  };
  topObj.onmouseleave = function(e) {
    /* Hide the tooltip if the mouse is outside the "timelineTableN" element,
    ** and outside the tooltip. */
    if(e.relatedTarget && e.relatedTarget != tooltipObj){

    var br = tx.rowinfo[ix].br
    var dest = tx.baseUrl + "/timeline?r=" + encodeURIComponent(br)
    dest += tx.fileDiff ? "&m&cf=" : "&m&c="
    dest += encodeURIComponent(tx.rowinfo[ix].h)
    return dest
  }
  function clickOnGraph(e){
    var ix = findTxIndex(e);
    showGraphTooltip(ix,e.x,e.y);
    tooltipInfo.ixHover = findTxIndex(e);
    tooltipInfo.posX = e.x;
    tooltipInfo.posY = e.y;
    showGraphTooltip();
  }
  function showGraphTooltip(ix,posX,posY){
    if( ix<0 ){
  function showGraphTooltip(){
    if( tooltipInfo.ixHoever<0 ){
      hideGraphTooltip()
    }else{  
    }else{
      var ix = tooltipInfo.ixHover
      var br = tx.rowinfo[ix].br
      var dest = branchHyperlink(ix)
      var hbr = br.replace(/&/g, "&amp;")
         .replace(/</g, "&lt;")
         .replace(/>/g, "&gt;")
         .replace(/"/g, "&quot;")
         .replace(/'/g, "&#039;");
      /* Setup while hidden, to ensure proper dimensions. */
      tooltipObj.style.visibility = "hidden"
      tooltipObj.innerHTML = "<a href=\""+dest+"\">"+hbr+"</a>"
      tooltipObj.style.display = "inline"
      tooltipObj.style.position = "absolute"
      var x = posX + 4 + window.pageXOffset
      var x = tooltipInfo.posX + 4 + window.pageXOffset
      tooltipObj.style.left = x+"px"
      var y = posY + window.pageYOffset - tooltipObj.clientHeight - 4
      var y = tooltipInfo.posY + window.pageYOffset - tooltipObj.clientHeight - 4
      tooltipObj.style.top = y+"px"
      tooltipObj.style.visibility = "visible"
      tooltipInfo.ixActive = ix;
    }
  }
  function dblclickOnGraph(e){
    var ix = findTxIndex(e);
    var dest = branchHyperlink(ix)
    hideGraphTooltip()
    window.location.href = dest