// SPDX-License-Identifier: GPL-3.0-or-later

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Copyright (C) 2013 - 2024, nymea GmbH
* Copyright (C) 2024 - 2025, chargebyte austria GmbH
*
* This file is part of nymea-app.
*
* nymea-app is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nymea-app is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with nymea-app. If not, see <https://www.gnu.org/licenses/>.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

import QtQuick
import Qt5Compat.GraphicalEffects
import Nymea

import "../utils"

Item {
    id: root
    implicitWidth: orientation == Qt.Horizontal ? 300 : 12
    implicitHeight: orientation == Qt.Horizontal ? 12 : 300

    property Thing thing: null

    readonly property StateType brightnessStateType: root.thing.thingClass.stateTypes.findByName("brightness")

    property int value: thing.stateByName("brightness").value

    property int orientation: Qt.Horizontal

    readonly property State powerState: thing ? thing.stateByName("power") : null

    ActionQueue {
        id: actionQueue
        thing: root.thing
        stateName: "brightness"
    }

    Rectangle {
        id: clipRect
        anchors.fill: parent
        radius: Style.cornerRadius
        color: Style.tileOverlayColor
    }

    LinearGradient {
        anchors.fill: parent
        anchors.rightMargin: root.orientation == Qt.Horizontal ?
                                 parent.width - (dragHandle.x + dragHandle.width / 2)
                               : 0
        anchors.topMargin: root.orientation == Qt.Vertical ?
                                 dragHandle.y + dragHandle.height / 2
                               : 0
        start: root.orientation == Qt.Horizontal ? Qt.point(0,0) : Qt.point(0, height)
        end: root.orientation == Qt.Horizontal ? Qt.point(width, 0) : Qt.point(0, 0)
        source: clipRect
        gradient: Gradient {
            GradientStop { position: 0.0; color: "transparent" }
            GradientStop { position: 1.0; color: "#55ffffff" }
        }
    }

    Rectangle {
        id: dragHandle
        x: root.orientation === Qt.Horizontal ?
               (actionQueue.pendingValue || root.value) * (root.width - dragHandle.width) / 100
             : 0
        y: root.orientation === Qt.Vertical ?
               root.height - dragHandle.height - ((actionQueue.pendingValue || root.value) * (root.height - dragHandle.height) / 100)
             : 0
        height: 14
        width: 14
        radius: 7
        color: Style.foregroundColor
    }

    MouseArea {
        anchors.fill: parent
        anchors.margins: -Style.smallMargins
        onPositionChanged: {
            var minCt = root.brightnessStateType.minValue;
            var maxCt = root.brightnessStateType.maxValue
            var brightness;
            if (root.orientation == Qt.Horizontal) {
                brightness = Math.min(maxCt, Math.max(minCt, (mouseX * (maxCt - minCt) / (width - dragHandle.width)) + minCt))
            } else {
                brightness = Math.min(maxCt, Math.max(minCt, ((height - mouseY) * (maxCt - minCt) / (height - dragHandle.height)) + minCt))
            }
            if (brightness > 0 && root.powerState && root.powerState.value === false) {
                root.thing.executeAction("power", [{paramName: "power", value: true}])
            }
            if (brightness === 0 && root.powerState && root.powerState.value === true) {
                root.thing.executeAction("power", [{paramName: "power", value: false}])
            }

            actionQueue.sendValue(brightness);
        }
    }
}