<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
<style>
  .container {
    display: flex;
    background-color: grey;
    font: 14px sans-serif;
    height: 50px;
  }
  #flex-sanity {
    /* This just needs to be large enough so that no shrinking is required. */
    width: 1600px;
  }
  .clamped-huge-item {
    flex: 1 1 1650px; /* This needs to be bigger than #flex-sanity, to test
                         the scenario it's aiming to test (early clamping of a
                         flex item which, if left unclamped, would've reversed
                         the direction of flexing & made everything shrink). */
    max-width: 10px;
  }

  .base        { align-self: baseline; }
  .lastbase    { align-self: last baseline; }

  .offset      { margin-top: 10px;
                 margin-bottom: 3px; }

  .lime        { background: lime;   }
  .yellow      { background: yellow; }
  .orange      { background: orange; }
  .pink        { background: pink;   }
  .tan         { background: tan;    }
  .white       { background: white;  }

  .crossMinMax { min-height: 40px;
                 max-height: 120px; }

  .mainMinMax  { min-width: 120px;
                 max-width: 500px; }

  .flexGrow    { flex-grow: 1; }
  .spacer150   { width: 150px;
                 box-sizing: border-box;
                 height: 10px;
                 border: 1px solid teal; }

</style>

<script>
"use strict";

SimpleTest.waitForExplicitFinish();

const TEXT_NODE = Node.TEXT_NODE;

function testItemMatchesExpectedValues(item, values, index) {
  if (typeof(values.node) != "undefined") {
    is(item.node, values.node, "Item index " + index + " has expected node.");
  }

  if (typeof(values.mainBaseSize) != "undefined") {
    is(item.mainBaseSize, values.mainBaseSize, "Item index " + index + " has expected mainBaseSize.");
  }

  if (typeof(values.mainDeltaSize) != "undefined") {
    is(item.mainDeltaSize, values.mainDeltaSize, "Item index " + index + " has expected mainDeltaSize.");
  }

  if (typeof(values.mainMinSize) != "undefined") {
    is(item.mainMinSize, values.mainMinSize, "Item index " + index + " has expected mainMinSize.");
  }

  if (typeof(values.mainMaxSize) != "undefined") {
    is(item.mainMaxSize, values.mainMaxSize, "Item index " + index + " has expected mainMaxSize.");
  } else {
    // If we didn't specify an expected mainMaxSize, then it's implied
    // that the max main-size property (max-width/max-height) is at its
    // default "none" value, which our FlexItem API represents as +infinity.
    is(item.mainMaxSize, Number.POSITIVE_INFINITY,
       "Item index " + index + " has expected (default) mainMaxSize.");
  }

  if (typeof(values.crossMinSize) != "undefined") {
    is(item.crossMinSize, values.crossMinSize, "Item index " + index + " has expected crossMinSize.");
  }

  if (typeof(values.crossMaxSize) != "undefined") {
    is(item.crossMaxSize, values.crossMaxSize, "Item index " + index + " has expected crossMaxSize.");
  } else {
    // As above for mainMaxSize, no-expected-value implies we expect +infinity.
    is(item.crossMaxSize, Number.POSITIVE_INFINITY,
       "Item index " + index + " has expected (default) crossMaxSize.");
  }
}

// Test for items in "flex-sanity" flex container:
function testFlexSanity() {
  let container = document.getElementById("flex-sanity");
  let flex = container.getAsFlexContainer();
  let lines = flex.getLines();
  is(lines.length, 1, "Container should have expected number of lines.");

  let line = lines[0];
  let containerHeight = container.getBoundingClientRect().height;
  is(line.crossSize, containerHeight,
     "Line crossSize should equal the height of the container.");

  // We can't compare baselines precisely, so we'll just confirm that they
  // appear somewhere within the elements that determine them.
  // (This assumes the first rect is baseline-aligned.)
  let firstRect = container.firstElementChild.getBoundingClientRect();
  ok(line.firstBaselineOffset > firstRect.top &&
     line.firstBaselineOffset < firstRect.bottom,
     "Line firstBaselineOffset should land somewhere within the element " +
     "that determines it.");

  // For last baseline, it's measured from the bottom, so we have to compare
  // against the element bounds subtracted from the container height.
  // We use the first node which uses last-baseline ("lb") alignment to
  // provide the rect:
  let lbElem = document.querySelector(".lastbase");
  let lbElemBoundingRect = lbElem.getBoundingClientRect();
  ok(line.lastBaselineOffset > containerHeight - lbElemBoundingRect.bottom &&
     line.lastBaselineOffset < containerHeight - lbElemBoundingRect.top,
     "Line lastBaselineOffset should land somewhere within the element" +
     "that determines it.");

  let expectedValues = [
    { crossMinSize: 0 },
    { mainBaseSize: 100,
      mainDeltaSize: 0 },
    { crossMinSize: 40,
      crossMaxSize: 120,
      mainDeltaSize: 0 },
    { mainMinSize: 120,
      mainMaxSize: 500,
      mainDeltaSize: 0 },
    { mainMinSize: 120,
      mainMaxSize: 500,
      mainBaseSize: 150,
      mainDeltaSize: 0 },
    { mainBaseSize:  10,
      mainMaxSize:   5,
      mainDeltaSize: 0 },
    { mainBaseSize: 10,
      mainMinSize:  15,
      mainDeltaSize: 0 },
    { mainBaseSize: 50,
      mainMaxSize: 10 },
    { mainBaseSize: 1650,
      mainMaxSize: 10,
      mainDeltaSize: 0 },
    { mainDeltaSize: 0 },
    { /* final item is anonymous flex item */ },
  ];

  let items = line.getItems();
  is(items.length, expectedValues.length,
     "Line should have expected number of items.");
  is(items.length, container.children.length + 1,
     "Line should have as many items as the flex container has child elems, " +
     "plus 1 for anonymous flex item");

  for (let i = 0; i < items.length; ++i) {
    let item = items[i];
    let values = expectedValues[i];
    // set the expected node to the node we're currently iterating over,
    // except for:
    // - the display:contents element (whose item is its first child)
    // - the final item (which is an anonymous flex item around text)
    if (i < container.children.length) {
      let curElem = container.children[i];
      values.node = (curElem.style.display == "contents"
                     ? curElem.firstElementChild
                     : curElem);
    } else {
      is(container.lastChild.nodeType, TEXT_NODE,
         "container's last child should be a text node");
      values.node = container.lastChild;
    }
    testItemMatchesExpectedValues(item, values, i);
  }

  // Check that the delta size of the first item is (roughly) equal to the
  // actual size minus the base size.
  isfuzzy(items[0].mainDeltaSize, firstRect.width - items[0].mainBaseSize, 1e-4,
          "flex-grow item should have expected mainDeltaSize.");
}

// Test for items in "flex-growing" flex container:
function testFlexGrowing() {
  let expectedValues = [
    { mainBaseSize:  10,
      mainDeltaSize: 10,
      mainMinSize:   35 },
    { mainBaseSize:  20,
      mainDeltaSize: 5,
      mainMinSize:   28 },
    { mainBaseSize:  30,
      mainDeltaSize: 7  },
    { mainBaseSize:  0,
      mainDeltaSize: 48,
      mainMaxSize:   20 },
  ];

  let container = document.getElementById("flex-growing");
  let items = container.getAsFlexContainer().getLines()[0].getItems();
  is(items.length, container.children.length,
     "Line should have as many items as the flex container has child elems");

  for (let i = 0; i < items.length; ++i) {
    let item = items[i];
    let values = expectedValues[i];
    testItemMatchesExpectedValues(item, values, i);
  }
}

function runTests() {
  testFlexSanity();
  testFlexGrowing();
  SimpleTest.finish();
}
</script>
</head>

<body onLoad="runTests();">
  <!-- First flex container to be tested: "flex-sanity".
       We test a few general things, e.g.:
       - accuracy of reported baselines.
       - accuracy of reported flex base size, min/max sizes, & trivial deltas.
       - flex items formation for display:contents subtrees & text nodes.
   -->
  <div id="flex-sanity" class="container">
    <div class="lime base flexGrow">one line (first)</div>
    <div class="yellow lastbase" style="width: 100px">one line (last)</div>
    <div class="orange offset lastbase crossMinMax">two<br/>lines and offset (last)</div>
    <div class="pink offset base mainMinMax">offset (first)</div>
    <!-- Inflexible item w/ content-derived flex base size, which has min/max
         but doesn't violate them: -->
    <div class="tan mainMinMax">
      <div class="spacer150"></div>
    </div>
    <!-- Inflexible item that is trivially clamped to smaller max-width: -->
    <div style="flex: 0 0 10px; max-width: 5px"></div>
    <!-- Inflexible item that is trivially clamped to larger min-width: -->
    <div style="flex: 0 0 10px; min-width: 15px"></div>
    <!-- Item that wants to grow but is trivially clamped to max-width
         below base size: -->
    <div style="flex: 1 1 50px; max-width: 10px"></div>
    <div class="clamped-huge-item"></div>
    <div style="display:contents">
      <div class="white">replaced</div>
    </div>
    anon item for text
  </div>

  <!-- Second flex container to be tested, with items that grow by specific
       predictable amounts. This ends up triggering 4 passes of the main
       flexbox layout algorithm loop - and note that for each item, we only
       report (via 'mainDeltaSize') the delta that it wanted in the *last pass
       of the loop before that item was frozen*.

       Here's what goes on in each pass (and the tentative deltas)
     * PASS 1
        - Available space = 120 - 10 - 20 - 30 - 0 = 60px.
        - Sum of flex values = 1+1+2+16 = 20. So 1 "share" is 60px/20 = 3px.
        - Deltas (space distributed): +3px, +3px, +6px, +48px
          VIOLATIONS:
            item0 is now 10+3 = 13px, which under its min
            item1 is now 20+3 = 23px, which under its min
            item3 is now 0+48 = 48px, which over its max
        - the magnitude of max-violations (how far we're out of bounds) exceeds
          magnitude of min-violations, so we prioritize the max-violations.
        - So we freeze item3 at its max-width, 20px, leaving its final "desired"
          mainDeltaSize at +48px from this pass.

     * PASS 2
        - Available space = 120 - 10 - 20 - 30 - 20 = 40px.
        - Sum of flex values = 1+1+2 = 4. So 1 "share" is 40px/4 = 10px.
        - Deltas (space distributed): +10px, +10px, +20px, +0px.
          VIOLATIONS:
            item0 is now 10+10 = 20px, which is under its min
        - So we freeze item0 at its min-width, 35px, leaving its final "desired"
          mainDeltaSize at +10px from this pass.

     * PASS 3
        - Available space = 120 - 35 - 20 - 30 - 20 = 15px.
        - Sum of flex values = 1+2 = 3. So 1 "share" is 15px/3 = 5px.
        - Deltas (space distributed): +0px, +5px, +10px, +0px.
          VIOLATIONS:
            item1 is now 20+5 = 25px, which is under its min
        - So we freeze item1 at its min-width, 28px, leaving its final "desired"
          mainDeltaSize at +5px from this pass.

     * PASS 4
        - Available space = 120 - 35 - 28 - 30 - 20 = 7px.
        - Sum of flex values = 2. So 1 "share" is 7px/2 = 3.5px
        - Deltas (space distributed): +0px, +0px, +7px, +0px.
          VIOLATIONS:
            None! (So, we'll be done after this pass!)
        - So we freeze item2 (the only unfrozen item) at its flexed size, 37px,
          and set its final "desired" mainDeltaSize to +7px from this pass.
        - And we're done!
       -->
  <div id="flex-growing" class="container" style="width: 120px">
    <div style="flex: 1 10px; min-width: 35px"></div>
    <div style="flex: 1 20px; min-width: 28px"></div>
    <div style="flex: 2 30px; min-width: 0"></div>
    <div style="flex: 16 0px; max-width: 20px"></div>
  </div>
</body>
</html>
