<!DOCTYPE html>
<html>
<head>
<script src="../../resources/js-test-pre.js"></script>
<title>Selection Initial</title>
</head>
<body>

<p id="startText">Start text. Before. <input id="button" type="button" value="Submit"> After.</p>

<p id="description"></p>
<div id="console"></div>

<p id="endText">End text.</p>

<script>
    description("This tests that initial selection is set when arrow keys are pressed and no selection exists.");
    
    var afterButtonTextRange = null;
    var beforeButtonTextRange = null;
    
    var documentEndTextRange = null;
    var documentStartTextRange = null;
    
    function clearSelection() {
        window.getSelection().removeAllRanges();
    }
    
    function isSelection() {
        return window.getSelection().rangeCount > 0;
    }
    
    function isSelectionAfterButton() {
        if (isSelection() === false)
            return false;
        var selectionRange = window.getSelection().getRangeAt(0);
        if (afterButtonTextRange === null) {
            var buttonNode = document.getElementById("button");
            afterButtonTextRange = new Range();
            afterButtonTextRange.setEndAfter(buttonNode);
            afterButtonTextRange.setStartBefore(buttonNode.nextSibling);
        }
        return selectionRange.endOffset === afterButtonTextRange.endOffset && selectionRange.startOffset === afterButtonTextRange.startOffset;
    }
    
    function isSelectionBeforeButton() {
        if (isSelection() === false)
            return false;
        var selectionRange = window.getSelection().getRangeAt(0);
        if (beforeButtonTextRange === null) {
            var buttonNode = document.getElementById("button");
            beforeButtonTextRange = new Range();
            beforeButtonTextRange.setEnd(buttonNode.previousSibling, buttonNode.previousSibling.length);
            beforeButtonTextRange.setStart(buttonNode.previousSibling, buttonNode.previousSibling.length);
        }
        return selectionRange.endOffset === beforeButtonTextRange.endOffset && selectionRange.startOffset === beforeButtonTextRange.startOffset;
    }
    
    function isSelectionAtEndOfDocument() {
        if (isSelection() === false)
            return false;
        var selectionRange = window.getSelection().getRangeAt(0);
        if (documentEndTextRange === null) {
            var endTextNode = document.getElementById("endText").firstChild;
            documentEndTextRange = new Range();
            documentEndTextRange.setEnd(endTextNode, endTextNode.length);
            documentEndTextRange.setStart(endTextNode, endTextNode.length);
        }
        return selectionRange.endOffset === documentEndTextRange.endOffset && selectionRange.startOffset === documentEndTextRange.startOffset;
    }
    
    function isSelectionAtStartOfDocument() {
        if (isSelection() === false)
            return false;
        var selectionRange = window.getSelection().getRangeAt(0);
        if (documentStartTextRange === null) {
            var startTextNode = document.getElementById("startText").firstChild;
            documentStartTextRange = new Range();
            documentStartTextRange.setEnd(startTextNode, 0);
            documentStartTextRange.setStart(startTextNode, 0);
        }
        return selectionRange.endOffset === documentStartTextRange.endOffset && selectionRange.startOffset === documentStartTextRange.startOffset;
    }
    
    if (window.accessibilityController && window.eventSender) {
        // Tests WITHOUT focus set.
        
        // Down arrow key (should NOT set initial selection before enhanced accessibility is enabled).
        shouldBe("isSelection()", "false");
        eventSender.keyDown("downArrow");
        shouldBe("isSelection()", "false");
        clearSelection();
        
        // Enable enhanced accessibility (necessary for accessibility specific selection handling).
        accessibilityController.enableEnhancedAccessibility(true);
        shouldBe("accessibilityController.enhancedAccessibilityEnabled", "true");
        
        // Down arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("downArrow");
        shouldBe("isSelectionAtStartOfDocument()", "true");
        clearSelection();
        
        // Left arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("leftArrow");
        shouldBe("isSelectionAtEndOfDocument()", "true");
        clearSelection();
        
        // Right arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("rightArrow");
        shouldBe("isSelectionAtStartOfDocument()", "true");
        clearSelection();
        
        // Up arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("upArrow");
        shouldBe("isSelectionAtEndOfDocument()", "true");
        clearSelection();
        
        // Z key (only arrow keys should set initial selection if no selection exists).
        shouldBe("isSelection()", "false");
        eventSender.keyDown("Z");
        shouldBe("isSelection()", "false");
        
        // Tests WITH focus set.
        
        // Set focus.
        document.getElementById("button").focus();
        
        // Down arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("downArrow");
        shouldBe("isSelectionAfterButton()", "true");
        clearSelection();
        
        // Left arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("leftArrow");
        shouldBe("isSelectionBeforeButton()", "true");
        clearSelection();
        
        // Right arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("rightArrow");
        shouldBe("isSelectionAfterButton()", "true");
        clearSelection();
        
        // Up arrow key.
        shouldBe("isSelection()", "false");
        eventSender.keyDown("upArrow");
        shouldBe("isSelectionBeforeButton()", "true");
        clearSelection();
        
        // Hide superfluous text.
        document.getElementById("endText").style.display = "none";
        document.getElementById("startText").style.display = "none";
    }
</script>

<script src="../../resources/js-test-post.js"></script>
</body>
</html>