/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#include "config.h"
#include "modules/accessibility/AXARIAGridCell.h"

#include "modules/accessibility/AXObjectCacheImpl.h"
#include "modules/accessibility/AXTable.h"
#include "modules/accessibility/AXTableRow.h"


namespace blink {

AXARIAGridCell::AXARIAGridCell(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
    : AXTableCell(layoutObject, axObjectCache)
{
}

AXARIAGridCell::~AXARIAGridCell()
{
}

AXARIAGridCell* AXARIAGridCell::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
{
    return new AXARIAGridCell(layoutObject, axObjectCache);
}

bool AXARIAGridCell::isAriaColumnHeader() const
{
    const AtomicString& role = getAttribute(HTMLNames::roleAttr);
    return equalIgnoringCase(role, "columnheader");
}

bool AXARIAGridCell::isAriaRowHeader() const
{
    const AtomicString& role = getAttribute(HTMLNames::roleAttr);
    return equalIgnoringCase(role, "rowheader");
}

AXObject* AXARIAGridCell::parentTable() const
{
    AXObject* parent = parentObjectUnignored();
    if (!parent)
        return 0;

    if (parent->isAXTable())
        return parent;

    // It could happen that we hadn't reached the parent table yet (in
    // case objects for rows were not ignoring accessibility) so for
    // that reason we need to run parentObjectUnignored once again.
    parent = parent->parentObjectUnignored();
    if (!parent || !parent->isAXTable())
        return 0;

    return parent;
}

void AXARIAGridCell::rowIndexRange(pair<unsigned, unsigned>& rowRange)
{
    AXObject* parent = parentObjectUnignored();
    if (!parent)
        return;

    if (parent->isTableRow()) {
        // We already got a table row, use its API.
        rowRange.first = toAXTableRow(parent)->rowIndex();
    } else if (parent->isAXTable()) {
        // We reached the parent table, so we need to inspect its
        // children to determine the row index for the cell in it.
        unsigned columnCount = toAXTable(parent)->columnCount();
        if (!columnCount)
            return;

        const auto& siblings = parent->children();
        unsigned childrenSize = siblings.size();
        for (unsigned k = 0; k < childrenSize; ++k) {
            if (siblings[k].get() == this) {
                rowRange.first = k / columnCount;
                break;
            }
        }
    }

    // as far as I can tell, grid cells cannot span rows
    rowRange.second = 1;
}

void AXARIAGridCell::columnIndexRange(pair<unsigned, unsigned>& columnRange)
{
    AXObject* parent = parentObjectUnignored();
    if (!parent)
        return;

    if (!parent->isTableRow() && !parent->isAXTable())
        return;

    const auto& siblings = parent->children();
    unsigned childrenSize = siblings.size();
    for (unsigned k = 0; k < childrenSize; ++k) {
        if (siblings[k].get() == this) {
            columnRange.first = k;
            break;
        }
    }

    // as far as I can tell, grid cells cannot span columns
    columnRange.second = 1;
}

AccessibilityRole AXARIAGridCell::scanToDecideHeaderRole()
{
    if (isAriaRowHeader())
        return RowHeaderRole;

    if (isAriaColumnHeader())
        return ColumnHeaderRole;

    return CellRole;
}

} // namespace blink