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**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** This file is part of Qt Creator.
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** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** GNU Lesser General Public License Usage
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** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** rights.  These rights are described in the Digia Qt LGPL Exception
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****************************************************************************/

import QtQuick 2.1
import Monitor 1.0
import "Overview.js" as Plotter

Canvas {
    id: canvas
    objectName: "Overview"
    contextType: "2d"

    readonly property int eventsPerPass: 512
    property int increment: -1
    property int offset: -1
    readonly property int bump: 10;
    readonly property int blockHeight: (height - bump) / qmlProfilerModelProxy.models.length;
    readonly property double spacing: width / zoomControl.traceDuration

    // ***** properties
    height: 50
    property bool dataReady: false
    property bool recursionGuard: false

    onWidthChanged: offset = -1

    // ***** functions
    function clear()
    {
        dataReady = false;
        increment = -1;
        offset = -1;
        requestPaint();
    }

    function updateRange() {
        if (recursionGuard)
            return;
        var newStartTime = Math.round(rangeMover.rangeLeft * zoomControl.traceDuration / width) +
                zoomControl.traceStart;
        var newEndTime = Math.max(Math.round(rangeMover.rangeRight * zoomControl.traceDuration /
                width) + zoomControl.traceStart, newStartTime + 500);
        zoomControl.setRange(newStartTime, newEndTime);
    }

    function clamp(val, min, max) {
        return Math.min(Math.max(val, min), max);
    }

    // ***** connections to external objects
    Connections {
        target: zoomControl
        onRangeChanged: {
            recursionGuard = true;
            var newRangeX = (zoomControl.rangeStart - zoomControl.traceStart) * width /
                    zoomControl.traceDuration;
            var newWidth = zoomControl.rangeDuration * width / zoomControl.traceDuration;
            var widthChanged = Math.abs(newWidth - rangeMover.rangeWidth) > 1;
            var leftChanged = Math.abs(newRangeX - rangeMover.rangeLeft) > 1;
            if (leftChanged)
                rangeMover.rangeLeft = newRangeX;

            if (leftChanged || widthChanged)
                rangeMover.rangeRight = newRangeX + newWidth;
            recursionGuard = false;
        }
    }

    Connections {
        target: qmlProfilerModelProxy
        onDataAvailable: {
            dataReady = true;
            increment = 0;
            var models = qmlProfilerModelProxy.models;
            for (var i = 0; i < models.length; ++i)
                increment += models[i].count;
            increment = Math.ceil(increment / eventsPerPass);
            offset = -1;
            requestPaint();
        }
        onNotesChanged: notes.doPaint = true;
    }

    Timer {
        id: paintTimer
        repeat: true
        running: offset >= 0
        interval: offset == 0 ? 1000 : 14 // Larger initial delay to avoid flickering on resize
        onTriggered: canvas.requestPaint()
    }

    // ***** slots
    onPaint: {
        var context = (canvas.context === null) ? getContext("2d") : canvas.context;

        Plotter.models = qmlProfilerModelProxy.models;
        Plotter.zoomControl = zoomControl;
        Plotter.notes = qmlProfilerModelProxy.notes;

        if (offset < 0) {
            context.reset();
            Plotter.drawGraph(canvas, context);
            if (dataReady) {
                Plotter.drawTimeBar(canvas, context);
                offset = 0;
            }
        } else if (offset < increment) {
            Plotter.drawData(canvas, context);
            ++offset;
        } else if (offset < 2 * increment) {
            Plotter.drawBindingLoops(canvas, context);
            ++offset;
        } else {
            notes.doPaint = true;
            offset = -1;
        }
    }

    Canvas {
        property alias bump: canvas.bump
        property alias spacing: canvas.spacing
        property bool doPaint: false
        onDoPaintChanged: {
            if (doPaint)
                requestPaint();
        }

        id: notes
        anchors.fill: parent
        onPaint: {
            if (doPaint) {
                var context = (notes.context === null) ? getContext("2d") : notes.context;
                context.reset();
                Plotter.drawNotes(notes, context);
                doPaint = false;
            }
        }
    }

    // ***** child items
    MouseArea {
        anchors.fill: canvas
        function jumpTo(posX) {
            var newX = posX - rangeMover.rangeWidth / 2;
            if (newX < 0)
                newX = 0;
            if (newX + rangeMover.rangeWidth > canvas.width)
                newX = canvas.width - rangeMover.rangeWidth;

            if (newX < rangeMover.rangeLeft) {
                // Changing left border will change width, so precompute right border here.
                var right = newX + rangeMover.rangeWidth;
                rangeMover.rangeLeft = newX;
                rangeMover.rangeRight = right;
            } else if (newX > rangeMover.rangeLeft) {
                rangeMover.rangeRight = newX + rangeMover.rangeWidth;
                rangeMover.rangeLeft = newX;
            }
        }

        onPressed: {
            jumpTo(mouse.x);
        }
        onPositionChanged: {
            jumpTo(mouse.x);
        }
    }

    RangeMover {
        id: rangeMover
        visible: dataReady
        onRangeLeftChanged: canvas.updateRange()
        onRangeRightChanged: canvas.updateRange()
    }

    Rectangle {
        height: 1
        width: parent.width
        color: "#858585"
    }
}