/*
 * Copyright (C) 2015  Malte Veerman <malte.veerman@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */


import QtQuick 2.6
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.2
import org.kde.kirigami 2.3 as Kirigami
import Fancontrol.Qml 1.0 as Fancontrol
import "math.js" as MoreMath
import "units.js" as Units
import "colors.js" as Colors


Item {
    id: root

    property QtObject fan
    property int margin: Kirigami.Units.smallSpacing
    property bool showControls: true
    property bool editable: true
    readonly property QtObject systemdCom: Fancontrol.Base.hasSystemdCommunicator ? Fancontrol.Base.systemdCom : null
    readonly property QtObject tempModel: Fancontrol.Base.tempModel
    readonly property real minTemp: Fancontrol.Base.minTemp
    readonly property real maxTemp: Fancontrol.Base.maxTemp
    readonly property string unit: Fancontrol.Base.unit
    readonly property real convertedMinTemp: Units.fromCelsius(minTemp, unit)
    readonly property real convertedMaxTemp: Units.fromCelsius(maxTemp, unit)

    onConvertedMinTempChanged: {
        meshCanvas.requestPaint();
        curveCanvas.requestPaint();
    }
    onConvertedMaxTempChanged: {
        meshCanvas.requestPaint();
        curveCanvas.requestPaint();
    }
    onFanChanged: curveCanvas.requestPaint()

    Item {
        id: graph

        property int fontSize: MoreMath.bound(8, height / 20 + 1, 16)
        property int verticalScalaCount: height > Kirigami.Units.gridUnit * 30 ? 11 : 6
        property var horIntervals: MoreMath.intervals(root.convertedMinTemp, root.convertedMaxTemp, 10)

        anchors {
            left: parent.left
            right: parent.right
            top: parent.top
            bottom: root.showControls ? settingsArea.top : parent.bottom
            bottomMargin: root.margin
        }
        visible: graphBackground.height > 0 && graphBackground.width > 0

        Item {
            id: verticalScala

            anchors {
                top: graphBackground.top
                bottom: graphBackground.bottom
                left: parent.left
            }
            width: MoreMath.maxWidth(children) + graph.fontSize / 3

            Repeater {
                id: verticalRepeater

                model: graph.verticalScalaCount

                Text {
                    x: verticalScala.width - implicitWidth - graph.fontSize / 3
                    y: graphBackground.height - graphBackground.height / (graph.verticalScalaCount - 1) * index - graph.fontSize * 2 / 3
                    horizontalAlignment: Text.AlignRight
                    color: Kirigami.Theme.textColor
                    text: Number(index * (100 / (graph.verticalScalaCount - 1))).toLocaleString(Qt.locale(), 'f', 0) + Qt.locale().percent
                    font.pixelSize: graph.fontSize
                }
            }
        }

        Item {
            id: horizontalScala

            anchors {
                right: graphBackground.right
                bottom: parent.bottom
                left: graphBackground.left
            }
            height: graph.fontSize * 2

            Repeater {
                model: graph.horIntervals.length;

                Text {
                    x: graphBackground.scaleX(Units.toCelsius(graph.horIntervals[index], unit)) - width/2
                    y: horizontalScala.height / 2 - implicitHeight / 2
                    color: Kirigami.Theme.textColor
                    text: Number(graph.horIntervals[index]).toLocaleString() + i18n(unit)
                    font.pixelSize: graph.fontSize
                }
            }
        }

        Rectangle {
            id: graphBackground

            Kirigami.Theme.colorSet: Kirigami.Theme.View
            color: Kirigami.Theme.backgroundColor
            border.color: Kirigami.Theme.textColor
            border.width: 2

            anchors {
                top: parent.top
                left: verticalScala.right
                bottom: horizontalScala.top
                right: parent.right
                topMargin: parent.fontSize
                rightMargin: parent.fontSize * 2
            }

            function scaleX(temp) {
                return (temp - minTemp) * width / (maxTemp - minTemp);
            }
            function scaleY(pwm) {
                return height - pwm * height / 255;
            }
            function scaleTemp(x) {
                return x / width * (maxTemp - minTemp) + minTemp;
            }
            function scalePwm(y) {
                return 255 - y / height * 255;
            }

            Canvas {
                id: curveCanvas

                anchors.fill: parent
                anchors.margins: parent.border.width
                renderStrategy: Canvas.Threaded
//                 renderTarget: Canvas.FramebufferObject

                onPaint: {
                    var c = curveCanvas.getContext("2d");
                    c.clearRect(0, 0, width, height);

                    if (!fan || !fan.hasTemp) {
                        return;
                    }

                    var gradient = c.createLinearGradient(0, 0, width, 0);
                    gradient.addColorStop(0, "rgb(0, 0, 255)");
                    gradient.addColorStop(1, "rgb(255, 0, 0)");
                    c.fillStyle = gradient;
                    c.lineWidth = graph.fontSize / 3;
                    c.strokeStyle = gradient;
                    c.lineJoin = "round";
                    c.beginPath();
                    if (fan.minPwm == 0) {
                        c.moveTo(stopPoint.centerX, height);
                    } else {
                        c.moveTo(0, stopPoint.centerY);
                        c.lineTo(stopPoint.centerX, stopPoint.centerY);
                    }
                    c.lineTo(stopPoint.centerX, stopPoint.centerY);
                    c.lineTo(maxPoint.centerX, maxPoint.centerY);
                    c.lineTo(width, maxPoint.centerY);
                    c.stroke();
                    c.lineTo(width, height);
                    if (fan.minPwm == 0) {
                        c.lineTo(stopPoint.centerX, height);
                    } else {
                        c.lineTo(0, height);
                    }
                    c.fill();

                    //blend graphBackground
                    gradient = c.createLinearGradient(0, 0, 0, height);
                    gradient.addColorStop(0, Colors.setAlpha(graphBackground.color, 0.5));
                    gradient.addColorStop(1, Colors.setAlpha(graphBackground.color, 0.9));
                    c.fillStyle = gradient;
                    c.fill();
                }

                Connections {
                    target: fan
                    onTempChanged: curveCanvas.requestPaint()
                    onMinPwmChanged: curveCanvas.markDirty(Qt.rect(0, 0, stopPoint.x, stopPoint.y))
                }
            }
            Canvas {
                id: meshCanvas

                anchors.fill: parent
                anchors.margins: parent.border.width
                renderStrategy: Canvas.Threaded
//                 renderTarget: Canvas.FramebufferObject

                onPaint: {
                    var c = meshCanvas.getContext("2d");
                    c.clearRect(0, 0, width, height);

                    //draw mesh
                    c.beginPath();
                    c.strokeStyle = Colors.setAlpha(Kirigami.Theme.textColor, 0.3);

                    //horizontal lines
                    for (var i=0; i<=100; i+=100/(graph.verticalScalaCount-1)) {
                        var y = graphBackground.scaleY(i*2.55);
                        if (i != 0 && i != 100) {
                            for (var j=0; j<=width; j+=15) {
                                c.moveTo(j, y);
                                c.lineTo(Math.min(j+5, width), y);
                            }
                        }
                    }

                    //vertical lines
                    if (graph.horIntervals.length > 1) {
                        for (var i=1; i<graph.horIntervals.length; i++) {
                            var x = graphBackground.scaleX(Units.toCelsius(graph.horIntervals[i], unit));
                            for (var j=0; j<=height; j+=20) {
                                c.moveTo(x, j);
                                c.lineTo(x, Math.min(j+5, height));
                            }
                        }
                    }
                    c.stroke();
                }
            }
            StatusPoint {
                id: currentPwm

                size: graph.fontSize
                visible: graphBackground.contains(center) && !!fan && fan.hasTemp
                fan: root.fan
            }
            PwmPoint {
                id: stopPoint

                color: !!fan ? fan.hasTemp ? "blue" : Qt.tint(Kirigami.Theme.disabledTextColor, Qt.rgba(0, 0, 1, 0.5)) : "transparent"
                size: graph.fontSize
                visible: !!fan ? fan.hasTemp : false
                draggable: root.editable
                maximumX: Math.min(graphBackground.scaleX(graphBackground.scaleTemp(maxPoint.x)-1), maxPoint.x-1)
                minimumY: Math.max(graphBackground.scaleY(graphBackground.scalePwm(maxPoint.y)-1), maxPoint.y+1)
                x: !!fan && fan.hasTemp ? graphBackground.scaleX(MoreMath.bound(root.minTemp, fan.minTemp, root.maxTemp)) - width/2 : -width/2
                y: !!fan && fan.hasTemp ? graphBackground.scaleY(fan.minStop) - height/2 : -height/2
                onDragFinished: {
                    fan.minStop = Math.round(graphBackground.scalePwm(centerY));
                    fan.minTemp = Math.round(graphBackground.scaleTemp(centerX));
                    if (fan.minPwm !== 0) fan.minPwm = fan.minStop;
                }
                onPositionChanged: {
                    var left = fan.minPwm === 0 ? x : 0;
                    var width = maxPoint.x - left;
                    var height = y - maxPoint.y;
                    curveCanvas.markDirty(Qt.rect(left, maxPoint.y, width, height));
                }
            }
            PwmPoint {
                id: maxPoint

                color: !!fan ? fan.hasTemp ? "red" : Qt.tint(Kirigami.Theme.disabledTextColor, Qt.rgba(1, 0, 0, 0.5)) : "transparent"
                size: graph.fontSize
                visible: !!fan ? fan.hasTemp : false
                draggable: root.editable
                minimumX: Math.max(graphBackground.scaleX(graphBackground.scaleTemp(stopPoint.x)+1), stopPoint.x+1)
                maximumY: Math.min(graphBackground.scaleY(graphBackground.scalePwm(stopPoint.y)+1), stopPoint.y-1)
                x: !!fan && fan.hasTemp ? graphBackground.scaleX(MoreMath.bound(root.minTemp, fan.maxTemp, root.maxTemp)) - width/2 : graphBackground.width - width/2
                y: !!fan && fan.hasTemp ? graphBackground.scaleY(fan.maxPwm) - height/2 : -height/2
                onDragFinished: {
                    fan.maxPwm = Math.round(graphBackground.scalePwm(centerY));
                    fan.maxTemp = Math.round(graphBackground.scaleTemp(centerX));
                }
                onPositionChanged: {
                    var width = x - stopPoint.x;
                    var height = stopPoint.y - y;
                    curveCanvas.markDirty(Qt.rect(stopPoint.x, y, width, height));
                }
            }
        }
    }

    FanControls {
        id: settingsArea

        fan: root.fan
        padding: root.margin
        anchors {
            left: parent.left
            leftMargin: padding
            right: parent.right
            rightMargin: padding
            bottom: parent.bottom
            bottomMargin: padding
        }
        visible: root.showControls && root.height >= height + 2*margin
    }
}