// Copyright (c) 2014-2018, The Monero Project
// 
// 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 the copyright holder 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 THE COPYRIGHT HOLDERS AND 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
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import QtQuick 2.5
import QtGraphicalEffects 1.0
import "." 1.0

Rectangle {
    id: button
    property alias text: label.text
    property bool checked: false
    property alias dotColor: dot.color
    property alias symbol: symbolText.text
    property int numSelectedChildren: 0
    property var under: null
    signal clicked()

    function doClick() {
        // Android workaround
        releaseFocus();
        clicked();
    }


    function getOffset() {
        var offset = 0
        var item = button
        while (item.under) {
            offset += 20 * scaleRatio
            item = item.under
        }
        return offset
    }

    color: "black"
    property bool present: !under || under.checked || checked || under.numSelectedChildren > 0
    height: present ? ((appWindow.height >= 800) ? 44 * scaleRatio  : 52 * scaleRatio ) : 0

    // Button gradient whilst checked
    // @TODO: replace by .png - gradient not available in 2d renderer
    LinearGradient {
        visible: button.checked ? true : false
        anchors.fill: parent
        start: Qt.point(0, 0)
        end: Qt.point(300, 0)
        gradient: Gradient {
           GradientStop { position: 1.0; color: "#333333" }
           GradientStop { position: 0.0; color: "black" }
        }
    }

    // button decorations that are subject to leftMargin offsets
    Rectangle {
        anchors.left: parent.left
        anchors.leftMargin: parent.getOffset() + 20 * scaleRatio
        height: parent.height
        width: button.checked ? 20: 10
        color: "#00000000"

        // dot if unchecked
        Rectangle {
            id: dot
            anchors.centerIn: parent
            width: 8 * scaleRatio
            height: 8 * scaleRatio
            radius: 4 * scaleRatio
            color: button.dotColor
            visible: !button.checked
        }

        // arrow if checked
        Image {
            anchors.centerIn: parent
            anchors.left: parent.left
            source: "../images/menuArrow.png"
            visible: button.checked
        }

        // button text
        Text {
            id: label
            anchors.verticalCenter: parent.verticalCenter
            anchors.left: parent.right
            anchors.leftMargin: 8 * scaleRatio
            font.family: Style.fontMedium.name
            font.bold: true
            font.pixelSize: 16 * scaleRatio
            color: "#FFFFFF"
        }
    }

    // menu button right arrow
    Image {
        anchors.verticalCenter: parent.verticalCenter
        anchors.right: parent.right
        anchors.rightMargin: 20 * scaleRatio
        anchors.leftMargin: parent.getOffset()
        source: "../images/right.png"
        opacity: button.checked ? 1.0 : 0.4
    }

    Text {
        id: symbolText
        anchors.centerIn: parent
        font.pixelSize: 11 * scaleRatio
        font.bold: true
        color: button.checked || buttonArea.containsMouse ? "#FFFFFF" : dot.color
        visible: appWindow.ctrlPressed
    }

    MouseArea {
        id: buttonArea
        anchors.fill: parent
        hoverEnabled: true
        onClicked: {
            if(parent.checked)
                return
            button.doClick()
            parent.checked = true
        }
    }

    transform: Scale {
        yScale: button.present ? 1 : 0

        Behavior on yScale {
            NumberAnimation { duration: 200; easing.type: Easing.OutCubic }
        }
    }

    Behavior on height {
        SequentialAnimation {
            NumberAnimation { duration: 200; easing.type: Easing.OutCubic }
        }
    }

    Behavior on checked {
        // we get the value of checked before the change
        ScriptAction { script: if (under) under.numSelectedChildren += checked > 0 ? -1 : 1 }
    }
}