import QtQuick 2.0
import QtQuick.Controls 2.13
import QtGraphicalEffects 1.13

import "qrc:/theme"
import "qrc:/const"

Button {
	id: button
	property var image: ""
	property var radius: Math.min(width / 2, height / 2)
	property var timeToPress: 100
	property var colorMode: 0 // 0->None; 1->White; 2->Green; 3->Yellow
	property color backLightColor: getColorMode()
	property var specialScale: 1
	property var visibleGlow: true

	signal pressed
	signal released

	onPressed: { button.down = true }
	onReleased: { button.down = false }

	implicitWidth: Const.macroButton
	implicitHeight: Const.macroButton

	function getColorMode() {
		switch(colorMode) {
		case(0): return Theme.current.none
		case(1): return Theme.current.white
		case(2): return Theme.current.green
		case(3): return Theme.current.yellow
		}
	}

	contentItem: Item {
		id: content
		anchors.fill: parent
		z: 1

		Item {
			property var factor: specialScale * (button.state == "Pressed" ?
									 Const.imageScalePressed : Const.imageScale)
			property var elevator: button.state == "Pressed" ? 3 : 0

			anchors.horizontalCenter: parent.horizontalCenter
			y: (parent.height * (1-factor)) / 2 + elevator
			width: parent.width * factor
			height: parent.height * factor

			Behavior on y {
				NumberAnimation {
					duration: timeToPress
					easing.type: Easing.InOutQuad
				}
			}

			Behavior on width {
				NumberAnimation {
					duration: timeToPress
					easing.type: Easing.InOutQuad
				}
			}

			Behavior on height {
				NumberAnimation {
					duration: timeToPress
					easing.type: Easing.InOutQuad
				}
			}

			Image {
				id: img
				anchors.fill: parent
				source: image
				fillMode: Image.PreserveAspectFit
				antialiasing: true
				smooth: true
			}

			ColorOverlay {
				anchors.fill: img
				source: img
				color: button.state == "Pressed" ? Theme.current.textSelected : Theme.current.text
				antialiasing: true
				smooth: true
			}
		}
	}

	background: Rectangle{
		id: background
		width: parent.implicitWidth
		height: parent.implicitHeight
		radius: button.radius
		color: Theme.current.button
		anchors.fill: parent

//		Rectangle {
//			anchors.fill: parent

//			layer.enabled: true
//			layer.effect: OpacityMask {
//				maskSource: parent
//			}
//			color: Theme.current.button
//			opacity: Theme.current.mergeOpacity

//			RadialGradient {
//				anchors.fill: parent
//				gradient: Gradient {
//					GradientStop { position: 0.0; color: backLightColor }
//					GradientStop { position: 0.3; color: backLightColor }
//					GradientStop { position: 0.5; color: "transparent" }
//					GradientStop { position: 1.0; color: "transparent" }
//				}
//			}
//		}

		MouseArea {
			hoverEnabled: true
			anchors.fill: background
			onEntered: {
				button.state = "Hovering"
			}

			onExited: {
				button.state = ""
			}

			onPressed: {
				button.state = "Pressed"
				button.pressed()
			}

			onReleased: {
				button.released()
				if (containsMouse)
					button.state = "Hovering"
				else
					button.state = ""
			}
		}
	}

	DropShadow {
		id: dropDown
		anchors.fill: background
		source: background
		horizontalOffset: 6
		verticalOffset: 6
		radius: 10
		samples: 16
		color: Theme.current.shadow
	}

	DropShadow {
		id: dropUp
		anchors.fill: background
		source: background
		horizontalOffset: -4
		verticalOffset: -4
		radius: 5
		samples: 10
		color: Theme.current.light
	}


	InnerShadow {
		id: innerUp
		anchors.fill: background
		source: background
		horizontalOffset: 3
		verticalOffset: 3
		radius: 2
		samples: 6
		smooth: true
		color: Theme.current.shadow
	}

	Glow {
		id: glow
		anchors.fill: background
		source: background
		radius: 10
		samples: 20
		color: backLightColor
		transparentBorder: true
		visible: visibleGlow
	}

	Item {
		id: hoverLight
		implicitWidth: parent.implicitWidth
		implicitHeight: parent.implicitHeight
		anchors.fill: parent

		layer.enabled: true
		layer.effect: OpacityMask {
			maskSource: background
		}

		Rectangle {
			id: hoverGlow
			width: 2 * parent.width
			height: parent.height
			x: - 2 * parent.width
			color: "transparent"

			HoverGlow {}
		}
	}

	states: [
		State {
			name: "Hovering"
			PropertyChanges {
				target: hoverGlow
				x: 0
			}
		},

		State {
			name: "Pressed"
			PropertyChanges {
				target: background
				color: Theme.current.buttonSelected
			}

			PropertyChanges {
				target: dropDown
				horizontalOffset: 0
				verticalOffset: 0
				radius: 0
				samples: 0
			}

			PropertyChanges {
				target: dropUp
				horizontalOffset: 0
				verticalOffset: 0
				radius: 0
				samples: 0
			}

			PropertyChanges {
				target: innerUp
				horizontalOffset: 6
				verticalOffset: 6
				radius: 6
				samples: 12
			}

			//			PropertyChanges {
			//				target: innerDown
			//				horizontalOffset: - 4
			//				verticalOffset: - 4
			//				radius: 4
			//				samples: 8
			//			}
		}
	]

	transitions: [
		Transition {
			from: ""; to: "Hovering"
			NumberAnimation {
				properties: "x"
				duration: 500
				easing.type: Easing.OutQuad
			}
		},

		Transition {
			from: "*"; to: "Pressed"

			ColorAnimation {
				properties: "color"
				duration: timeToPress
			}

			NumberAnimation {
				properties: "horizontalOffset, verticalOffset, radius, samples"
				duration: timeToPress
				easing.type: Easing.InOutQuad
			}
		},

		Transition {
			from: "Pressed"; to: "*"

			ColorAnimation {
				properties: "color"
				duration: timeToPress
			}

			NumberAnimation {
				properties: "horizontalOffset, verticalOffset, radius, samples"
				duration: timeToPress
				easing.type: Easing.InOutQuad
			}
		}
	]
}