/*
 *  SPDX-FileCopyrightText: 2018 Marco Martin <mart@kde.org>
 *
 *  SPDX-License-Identifier: LGPL-2.0-or-later
 */

import QtQuick
import QtQuick.Layouts
import QtQuick.Templates as T
import org.kde.kirigami as Kirigami

/**
 * A AbstractCard is the base for cards. A Card is a visual object that serves
 * as an entry point for more detailed information. An abstractCard is empty,
 * providing just the look and the base properties and signals for an ItemDelegate.
 * It can be filled with any custom layout of items, its content is organized
 * in 3 properties: header, contentItem and footer.
 * Use this only when you need particular custom contents, for a standard layout
 * for cards, use the Card component.
 *
 * @see Card
 * @inherit QtQuick.Controls.ItemDelegate
 * @since 2.4
 */
T.ItemDelegate {
    id: root

//BEGIN properties
    /**
     * @brief This property holds an item that serves as a header.
     *
     * This item will be positioned on top if headerOrientation is ``Qt.Vertical``
     * or on the left if it is ``Qt.Horizontal``.
     */
    property alias header: headerFooterLayout.header

    /**
     * @brief This property sets the card's orientation.
     *
     * * ``Qt.Vertical``: the header will be positioned on top
     * * ``Qt.Horizontal``: the header will be positioned on the left (or right if an RTL layout is used)
     *
     * default: ``Qt.Vertical``
     *
     * @property Qt::Orientation headerOrientation
     */
    property int headerOrientation: Qt.Vertical

    /**
     * @brief This property holds an item that serves as a footer.
     *
     * This item will be positioned at the bottom if headerOrientation is ``Qt.Vertical``
     * or on the right if it is ``Qt.Horizontal``.
     */
    property alias footer: headerFooterLayout.footer

    /**
     * @brief This property sets whether clicking or tapping on the card area shows a visual click feedback.
     *
     * Use this if you want to do an action in the onClicked signal handler of the card.
     *
     * default: ``false``
     */
    property bool showClickFeedback: false

//END properties

    Layout.fillWidth: true

    implicitWidth: Math.max(implicitBackgroundWidth + leftInset + rightInset,
                            outerPaddingLayout.implicitWidth)
    implicitHeight: Math.max(implicitBackgroundHeight + topInset + bottomInset,
                             outerPaddingLayout.implicitHeight)

    hoverEnabled: !Kirigami.Settings.tabletMode && showClickFeedback

    Kirigami.Theme.inherit: false
    Kirigami.Theme.colorSet: Kirigami.Theme.View

    width: ListView.view ? ListView.view.width - ListView.view.leftMargin - ListView.view.rightMargin : undefined
    padding: Kirigami.Units.largeSpacing

    // Card component repurposes control's contentItem property, so it has to
    // reimplement content layout and its padding manually.
    Kirigami.Padding {
        id: outerPaddingLayout

        anchors.fill: parent

        topPadding: root.topPadding
        leftPadding: root.leftPadding
        rightPadding: root.rightPadding
        bottomPadding: root.bottomPadding

        contentItem: Kirigami.HeaderFooterLayout {
            id: headerFooterLayout

            contentItem: Kirigami.Padding {
                id: innerPaddingLayout

                contentItem: root.contentItem

                // Hide it altogether, so that vertical padding won't be
                // included in control's total implicit height.
                visible: contentItem !== null

                topPadding: headerFooterLayout.header ? Kirigami.Units.largeSpacing : 0
                bottomPadding: headerFooterLayout.footer ? Kirigami.Units.largeSpacing : 0
            }
        }
    }

    // HACK: A Control like this ItemDelegate tries to manage its
    // contentItem's positioning, so we need to override that. This is
    // equivalent to declaring x/y/width/height bindings in QQC2 style
    // implementations.
    Connections {
        target: root.contentItem

        function onXChanged() {
            root.contentItem.x = 0;
        }

        function onYChanged() {
            root.contentItem.y = Qt.binding(() => innerPaddingLayout.topPadding);
        }
    }
}