/*
 * Copyright (C) 2015  Malte Veerman <maldela@halloarsch.de>
 *
 * 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 2.4
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.1
import Fancontrol.Qml 1.0 as Fancontrol
import "math.js" as MoreMath
import "units.js" as Units
import "colors.js" as Colors


Rectangle {
    property QtObject fan
    property QtObject systemdCom
    property QtObject tempModel
    property real minTemp: 40.0
    property real maxTemp: 90.0
    property int margin: 5
    property string unit: "°C"
    property real convertedMinTemp: Units.fromCelsius(minTemp, unit)
    property real convertedMaxTemp: Units.fromCelsius(maxTemp, unit)

    id: root
    color: "transparent"
    border.color: palette.windowText
    border.width: 2
    radius: 10
    clip: false

    onMinTempChanged: if (!!fan) meshCanvas.requestPaint()
    onMaxTempChanged: if (!!fan) meshCanvas.requestPaint()
    onUnitChanged: if (!!fan) meshCanvas.requestRepaint()

    SystemPalette {
        id: palette
        colorGroup: SystemPalette.Active
    }
    SystemPalette {
        id: disabledPalette
        colorGroup: SystemPalette.Disabled
    }

    TextEdit {
        id: nameField

        anchors {
            left: parent.left
            leftMargin: margin
            right: parent.right
            rightMargin: margin
            top: parent.top
            topMargin: margin
        }
        visible: root.height >= height + margin*2
        text: !!fan ? fan.name : ""
        color: palette.text
        horizontalAlignment: TextEdit.AlignLeft
        wrapMode: TextEdit.Wrap
        font.bold: true
        font.pointSize: 14
        selectByMouse: true

        onTextChanged: {
            if (!!fan) {
                fan.name = text;
            }
        }

        Connections {
            target: fan
            onNameChanged: if (fan.name != text) text = fan.name
        }

        MouseArea {
            anchors.fill: parent
            cursorShape: Qt.IBeamCursor
            acceptedButtons: Qt.NoButton
        }
    }

    Item {
        id: graph

        property int fontSize: MoreMath.bound(8, height / 20 + 1, 16)
        property QtObject pal: !!fan ? fan.hasTemp ? palette : disabledPalette : disabledPalette
        property int verticalScalaCount: 6
        property var horIntervals: MoreMath.intervals(root.convertedMinTemp, root.convertedMaxTemp, 10)

        anchors {
            left: parent.left
            right: parent.right
            top: nameField.bottom
            bottom: settingsArea.top
        }
        visible: background.height > 0 && background.width > 0

        Item {
            id: verticalScala

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

            Repeater {
                id: verticalRepeater

                model: graph.verticalScalaCount

                Label {
                    x: verticalScala.width - implicitWidth - graph.fontSize / 3
                    y: background.height - background.height / (graph.verticalScalaCount - 1) * index - graph.fontSize / 2
                    horizontalAlignment: Text.AlignRight
                    color: graph.pal.text
                    text: i18n("%1\%", index * (100 / (graph.verticalScalaCount - 1)))
                    font.pixelSize: graph.fontSize
                }
            }
        }
        Item {
            id: horizontalScala

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

            Repeater {
                model: graph.horIntervals.length;

                Label {
                    x: Math.min(horizontalScala.width, background.width / (graph.horIntervals.length - 1) * index) - width / 2
                    y: horizontalScala.height / 2 - implicitHeight / 2
                    color: graph.pal.text
                    text: i18n("%1" + unit, graph.horIntervals[index])
                    font.pixelSize: graph.fontSize
                }
            }
        }

        Rectangle {
            id: background

            property alias pal: graph.pal

            color: pal.light
            border.color: pal.text
            border.width: 2
            radius: 1

            anchors {
                top: parent.top
                left: verticalScala.right
                bottom: horizontalScala.top
                right: parent.right
                topMargin: parent.fontSize
                bottomMargin: 0
                rightMargin: parent.fontSize * 2
                leftMargin: 0
            }

            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: bgCanvas

                anchors.fill: parent
                anchors.margins: parent.border.width
                renderStrategy: Canvas.Cooperative

                property alias pal: background.pal

                onPaint: {
                    var c = bgCanvas.getContext("2d");
                    c.clearRect(0, 0, width, height);
                    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 (fanOffCheckBox.checked) {
                        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 (fanOffCheckBox.checked) {
                        c.lineTo(stopPoint.centerX, height);
                    } else {
                        c.lineTo(0, height);
                    }
                    c.fill();

                    //blend background
                    gradient = c.createLinearGradient(0, 0, 0, height);
                    gradient.addColorStop(0, Colors.setAlpha(background.color, 0.5));
                    gradient.addColorStop(1, Colors.setAlpha(background.color, 0.9));
                    c.fillStyle = gradient;
                    c.fill();
                }
            }
            Canvas {
                id: meshCanvas

                anchors.fill: parent
                anchors.margins: parent.border.width
                renderStrategy: Canvas.Cooperative

                property alias pal: background.pal

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

                    //draw mesh
                    c.beginPath();
                    c.strokeStyle = Colors.setAlpha(pal.text, 0.3);

                    //horizontal lines
                    for (var i=0; i<=100; i+=20) {
                        var y = background.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 = background.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: background.contains(center) && !!fan && fan.hasTemp
                fan: root.fan
                unit: root.unit
            }
            PwmPoint {
                id: stopPoint
                color: !!fan ? fan.hasTemp ? "blue" : Qt.tint(graph.pal.light, Qt.rgba(0, 0, 1, 0.5)) : "transparent"
                size: graph.fontSize
                unit: root.unit
                enabled: !!fan ? fan.hasTemp : false
                drag.maximumX: Math.min(background.scaleX(background.scaleTemp(maxPoint.x)-1), maxPoint.x-1)
                drag.minimumY: Math.max(background.scaleY(background.scalePwm(maxPoint.y)-1), maxPoint.y+1)
                x: !!fan && fan.hasTemp ? background.scaleX(MoreMath.bound(minTemp, fan.minTemp, maxTemp)) - width/2 : -width/2
                y: !!fan && fan.hasTemp ? background.scaleY(fan.minStop) - height/2 : -height/2
                drag.onActiveChanged: {
                    if (!drag.active && !!fan) {
                        fan.minStop = Math.round(background.scalePwm(centerY));
                        fan.minTemp = Math.round(background.scaleTemp(centerX));
                        if (!fanOffCheckBox.checked) fan.minPwm = fan.minStop;
                    }
                }
                onPositionChanged: {
                    var left = fanOffCheckBox.checked ? x : 0;
                    var width = maxPoint.x - left;
                    var height = y - maxPoint.y;
                    bgCanvas.markDirty(Qt.rect(left, maxPoint.y, width, height));
                }
            }
            PwmPoint {
                id: maxPoint
                color: !!fan ? fan.hasTemp ? "red" : Qt.tint(graph.pal.light, Qt.rgba(1, 0, 0, 0.5)) : "transparent"
                size: graph.fontSize
                unit: root.unit
                enabled: !!fan ? fan.hasTemp : false
                drag.minimumX: Math.max(background.scaleX(background.scaleTemp(stopPoint.x)+1), stopPoint.x+1)
                drag.maximumY: Math.min(background.scaleY(background.scalePwm(stopPoint.y)+1), stopPoint.y-1)
                x: !!fan && fan.hasTemp ? background.scaleX(MoreMath.bound(minTemp, fan.maxTemp, maxTemp)) - width/2 : background.width - width/2
                y: !!fan && fan.hasTemp ? background.scaleY(fan.maxPwm) - height/2 : -height/2
                drag.onActiveChanged: {
                    if (!drag.active) {
                        fan.maxPwm = Math.round(background.scalePwm(centerY));
                        fan.maxTemp = Math.round(background.scaleTemp(centerX));
                    }
                }
                onPositionChanged: {
                    var width = x - stopPoint.x;
                    var height = stopPoint.y - y;
                    bgCanvas.markDirty(Qt.rect(stopPoint.x, y, width, height));
                }
            }
        }
    }

    ColumnLayout {
        property int padding: 10

        id: settingsArea
        anchors {
            left: parent.left
            leftMargin: padding
            right: parent.right
            rightMargin: padding
            bottom: parent.bottom
            bottomMargin: padding
        }
        visible: root.height >= nameField.height + height + 2*margin
        clip: true
        spacing: 2

        RowLayout {
            CheckBox {
                id: hasTempCheckBox
                text: i18n("Controlled by:")
                checked: !!fan ? fan.hasTemp : false
                Layout.alignment: Qt.AlignLeft | Qt.AlignVCenter
                onCheckedChanged: {
                    if (!!fan) {
                        fan.hasTemp = checked;
                        if (checked && !!tempModel.temps[tempBox.currentIndex]) {
                            fan.temp = tempModel.temps[tempBox.currentIndex];
                        }
                        bgCanvas.requestPaint();
                    }
                }

                Connections {
                    target: root
                    onFanChanged: hasTempCheckBox.checked = !!fan ? fan.hasTemp : false
                }
                Connections {
                    target: fan
                    onHasTempChanged: hasTempCheckBox.checked = fan.hasTemp
                }
            }
            RowLayout {
                ComboBox {
                    id: tempBox
                    Layout.fillWidth: true
                    model: tempModel
                    textRole: "display"
                    enabled: hasTempCheckBox.checked
                    onCurrentIndexChanged: {
                        if (hasTempCheckBox.checked)
                            fan.temp = tempModel.temps[currentIndex];
                    }
                }

                Connections {
                    target: root
                    onFanChanged: if (!!fan && fan.hasTemp) tempBox.currentIndex = tempModel.temps.indexOf(fan.temp)
                }
                Connections {
                    target: fan
                    onTempChanged: if (fan.hasTemp) tempBox.currentIndex = tempModel.temps.indexOf(fan.temp)
                }
            }
        }

        CheckBox {
            id: fanOffCheckBox
            text: i18n("Turn Fan off if temp < MINTEMP")
            enabled: hasTempCheckBox.checked
            checked: !!fan ? fan.minPwm == 0 : false
            onCheckedChanged: {
                if (!!fan) {
                    fan.minPwm = checked ? 0 : fan.minStop;
                    bgCanvas.markDirty(Qt.rect(0, 0, stopPoint.x, stopPoint.y));
                }
            }

            Connections {
                target: root
                onFanChanged: if (!!fan) fanOffCheckBox.checked = fan.minPwm == 0
            }
            Connections {
                target: fan
                onMinPwmChanged: fanOffCheckBox.checked = fan.minPwm == 0
            }
        }

        RowLayout {
            enabled: fanOffCheckBox.checked && fanOffCheckBox.enabled

            Label {
                text: i18n("Pwm value for fan to start:")
                Layout.alignment: Qt.AlignLeft | Qt.AlignVCenter
                renderType: Text.NativeRendering
            }
            SpinBox {
                id: minStartInput
                Layout.fillWidth: true
                minimumValue: 1
                maximumValue: 100
                decimals: 1
                value: !!fan ? Math.round(fan.minStart / 2.55) : 0
                suffix: i18n("%")
                onValueChanged: {
                    if (!!fan) {
                        fan.minStart = Math.round(value * 2.55)
                    }
                }
            }
        }

        RowLayout {
            visible: !!systemdCom

            Item {
                Layout.fillWidth: true
            }
            Button {
                id: testButton

                text: !!fan ? fan.testing ? i18n("Abort test") : i18n("Test start and stop values") : ""
                iconName: "dialog-password"
                anchors.right: parent.right
                onClicked: {
                    if (fan.testing) {
                        fan.abortTest();
                    } else {
                        minStartInput.value = Qt.binding(function() { return Math.round(fan.minStart / 2.55) });
                        fan.test();
                    }
                }
            }
        }
    }
}