/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

/** Represents the state of an accessible UI element.

    An instance of this class is returned by `AccessibilityHandler::getCurrentState()`
    to convey its current state to an accessibility client.

    @see AccessibilityHandler

    @tags{Accessibility}
*/
class JUCE_API  AccessibleState
{
public:
    /** Constructor.

        Represents a "default" state with no flags set. To set a flag, use one of the
        `withX()` methods - these can be chained together to set multiple flags.
    */
    AccessibleState() = default;

    //==============================================================================
    /** Sets the checkable flag and returns the new state.

        @see isCheckable
    */
    JUCE_NODISCARD AccessibleState withCheckable() const noexcept            { return withFlag (Flags::checkable); }

    /** Sets the checked flag and returns the new state.

        @see isChecked
    */
    JUCE_NODISCARD AccessibleState withChecked() const noexcept              { return withFlag (Flags::checked); }

    /** Sets the collapsed flag and returns the new state.

        @see isCollapsed
    */
    JUCE_NODISCARD AccessibleState withCollapsed() const noexcept            { return withFlag (Flags::collapsed); }

    /** Sets the expandable flag and returns the new state.

        @see isExpandable
    */
    JUCE_NODISCARD AccessibleState withExpandable() const noexcept           { return withFlag (Flags::expandable); }

    /** Sets the expanded flag and returns the new state.

        @see isExpanded
    */
    JUCE_NODISCARD AccessibleState withExpanded() const noexcept             { return withFlag (Flags::expanded); }

    /** Sets the focusable flag and returns the new state.

        @see isFocusable
    */
    JUCE_NODISCARD AccessibleState withFocusable() const noexcept            { return withFlag (Flags::focusable); }

    /** Sets the focused flag and returns the new state.

        @see isFocused
    */
    JUCE_NODISCARD AccessibleState withFocused() const noexcept              { return withFlag (Flags::focused); }

    /** Sets the ignored flag and returns the new state.

        @see isIgnored
    */
    JUCE_NODISCARD AccessibleState withIgnored() const noexcept              { return withFlag (Flags::ignored); }

    /** Sets the selectable flag and returns the new state.

        @see isSelectable
    */
    JUCE_NODISCARD AccessibleState withSelectable() const noexcept           { return withFlag (Flags::selectable); }

    /** Sets the multiSelectable flag and returns the new state.

        @see isMultiSelectable
    */
    JUCE_NODISCARD AccessibleState withMultiSelectable() const noexcept      { return withFlag (Flags::multiSelectable); }

    /** Sets the selected flag and returns the new state.

        @see isSelected
    */
    JUCE_NODISCARD AccessibleState withSelected() const noexcept             { return withFlag (Flags::selected); }

    /** Sets the accessible offscreen flag and returns the new state.

        @see isSelected
    */
    JUCE_NODISCARD AccessibleState withAccessibleOffscreen() const noexcept  { return withFlag (Flags::accessibleOffscreen); }

    //==============================================================================
    /** Returns true if the UI element is checkable.

        @see withCheckable
    */
    bool isCheckable() const noexcept            { return isFlagSet (Flags::checkable); }

    /** Returns true if the UI element is checked.

        @see withChecked
    */
    bool isChecked() const noexcept              { return isFlagSet (Flags::checked); }

    /** Returns true if the UI element is collapsed.

        @see withCollapsed
    */
    bool isCollapsed() const noexcept            { return isFlagSet (Flags::collapsed); }

    /** Returns true if the UI element is expandable.

        @see withExpandable
    */
    bool isExpandable() const noexcept           { return isFlagSet (Flags::expandable); }

    /** Returns true if the UI element is expanded.

        @see withExpanded
    */
    bool isExpanded() const noexcept             { return isFlagSet (Flags::expanded); }

    /** Returns true if the UI element is focusable.

        @see withFocusable
    */
    bool isFocusable() const noexcept            { return isFlagSet (Flags::focusable); }

    /** Returns true if the UI element is focused.

        @see withFocused
    */
    bool isFocused() const noexcept              { return isFlagSet (Flags::focused); }

    /** Returns true if the UI element is ignored.

        @see withIgnored
    */
    bool isIgnored() const noexcept              { return isFlagSet (Flags::ignored); }

    /** Returns true if the UI element supports multiple item selection.

        @see withMultiSelectable
    */
    bool isMultiSelectable() const noexcept      { return isFlagSet (Flags::multiSelectable); }

    /** Returns true if the UI element is selectable.

        @see withSelectable
    */
    bool isSelectable() const noexcept           { return isFlagSet (Flags::selectable); }

    /** Returns true if the UI element is selected.

        @see withSelected
    */
    bool isSelected() const noexcept             { return isFlagSet (Flags::selected); }

    /** Returns true if the UI element is accessible offscreen.

        @see withSelected
    */
    bool isAccessibleOffscreen() const noexcept  { return isFlagSet (Flags::accessibleOffscreen); }

private:
    enum Flags
    {
        checkable           = (1 << 0),
        checked             = (1 << 1),
        collapsed           = (1 << 2),
        expandable          = (1 << 3),
        expanded            = (1 << 4),
        focusable           = (1 << 5),
        focused             = (1 << 6),
        ignored             = (1 << 7),
        multiSelectable     = (1 << 8),
        selectable          = (1 << 9),
        selected            = (1 << 10),
        accessibleOffscreen = (1 << 11)
    };

    JUCE_NODISCARD AccessibleState withFlag (int flag) const noexcept
    {
        auto copy = *this;
        copy.flags |= flag;

        return copy;
    }

    bool isFlagSet (int flag) const noexcept
    {
        return (flags & flag) != 0;
    }

    int flags = 0;
};

} // namespace juce