/* vim: set expandtab sw=4 ts=4 sts=4: */

/* global ColumnType, DataTable, JQPlotChartFactory */ // js/chart.js
/* global codeMirrorEditor */ // js/functions.js

var chartData = {};
var tempChartTitle;

var currentChart = null;
var currentSettings = null;

var dateTimeCols = [];
var numericCols = [];

function extractDate (dateString) {
    var matches;
    var match;
    var dateTimeRegExp = /[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}/;
    var dateRegExp = /[0-9]{4}-[0-9]{2}-[0-9]{2}/;

    matches = dateTimeRegExp.exec(dateString);
    if (matches !== null && matches.length > 0) {
        match = matches[0];
        return new Date(match.substr(0, 4), parseInt(match.substr(5, 2), 10) - 1, match.substr(8, 2), match.substr(11, 2), match.substr(14, 2), match.substr(17, 2));
    } else {
        matches = dateRegExp.exec(dateString);
        if (matches !== null && matches.length > 0) {
            match = matches[0];
            return new Date(match.substr(0, 4), parseInt(match.substr(5, 2), 10) - 1, match.substr(8, 2));
        }
    }
    return null;
}

function queryChart (data, columnNames, settings) {
    if ($('#querychart').length === 0) {
        return;
    }

    var plotSettings = {
        title : {
            text : settings.title,
            escapeHtml: true
        },
        grid : {
            drawBorder : false,
            shadow : false,
            background : 'rgba(0,0,0,0)'
        },
        legend : {
            show : true,
            placement : 'outsideGrid',
            location : 'e',
            rendererOptions: {
                numberColumns: 2
            }
        },
        axes : {
            xaxis : {
                label : Functions.escapeHtml(settings.xaxisLabel)
            },
            yaxis : {
                label : settings.yaxisLabel
            }
        },
        stackSeries : settings.stackSeries
    };

    // create the chart
    var factory = new JQPlotChartFactory();
    var chart = factory.createChart(settings.type, 'querychart');

    // create the data table and add columns
    var dataTable = new DataTable();
    if (settings.type === 'timeline') {
        dataTable.addColumn(ColumnType.DATE, columnNames[settings.mainAxis]);
    } else if (settings.type === 'scatter') {
        dataTable.addColumn(ColumnType.NUMBER, columnNames[settings.mainAxis]);
    } else {
        dataTable.addColumn(ColumnType.STRING, columnNames[settings.mainAxis]);
    }

    var i;
    var values = [];
    if (settings.seriesColumn === null) {
        $.each(settings.selectedSeries, function (index, element) {
            dataTable.addColumn(ColumnType.NUMBER, columnNames[element]);
        });

        // set data to the data table
        var columnsToExtract = [settings.mainAxis];
        $.each(settings.selectedSeries, function (index, element) {
            columnsToExtract.push(element);
        });
        var newRow;
        var row;
        var col;
        for (i = 0; i < data.length; i++) {
            row = data[i];
            newRow = [];
            for (var j = 0; j < columnsToExtract.length; j++) {
                col = columnNames[columnsToExtract[j]];
                if (j === 0) {
                    if (settings.type === 'timeline') { // first column is date type
                        newRow.push(extractDate(row[col]));
                    } else if (settings.type === 'scatter') {
                        newRow.push(parseFloat(row[col]));
                    } else { // first column is string type
                        newRow.push(row[col]);
                    }
                } else { // subsequent columns are of type, number
                    newRow.push(parseFloat(row[col]));
                }
            }
            values.push(newRow);
        }
        dataTable.setData(values);
    } else {
        var seriesNames = {};
        var seriesNumber = 1;
        var seriesColumnName = columnNames[settings.seriesColumn];
        for (i = 0; i < data.length; i++) {
            if (! seriesNames[data[i][seriesColumnName]]) {
                seriesNames[data[i][seriesColumnName]] = seriesNumber;
                seriesNumber++;
            }
        }

        $.each(seriesNames, function (seriesName) {
            dataTable.addColumn(ColumnType.NUMBER, seriesName);
        });

        var valueMap = {};
        var xValue;
        var value;
        var mainAxisName = columnNames[settings.mainAxis];
        var valueColumnName = columnNames[settings.valueColumn];
        for (i = 0; i < data.length; i++) {
            xValue = data[i][mainAxisName];
            value = valueMap[xValue];
            if (! value) {
                value = [xValue];
                valueMap[xValue] = value;
            }
            seriesNumber = seriesNames[data[i][seriesColumnName]];
            value[seriesNumber] = parseFloat(data[i][valueColumnName]);
        }

        $.each(valueMap, function (index, value) {
            values.push(value);
        });
        dataTable.setData(values);
    }

    // draw the chart and return the chart object
    chart.draw(dataTable, plotSettings);
    return chart;
}

function drawChart () {
    currentSettings.width = $('#resizer').width() - 20;
    currentSettings.height = $('#resizer').height() - 20;

    // TODO: a better way using .redraw() ?
    if (currentChart !== null) {
        currentChart.destroy();
    }

    var columnNames = [];
    $('select[name="chartXAxis"] option').each(function () {
        columnNames.push(Functions.escapeHtml($(this).text()));
    });
    try {
        currentChart = queryChart(chartData, columnNames, currentSettings);
        if (currentChart !== null) {
            $('#saveChart').attr('href', currentChart.toImageString());
        }
    } catch (err) {
        Functions.ajaxShowMessage(err.message, false);
    }
}

function getSelectedSeries () {
    var val = $('select[name="chartSeries"]').val() || [];
    var ret = [];
    $.each(val, function (i, v) {
        ret.push(parseInt(v, 10));
    });
    return ret;
}

function onXAxisChange () {
    var $xAxisSelect = $('select[name="chartXAxis"]');
    currentSettings.mainAxis = parseInt($xAxisSelect.val(), 10);
    if (dateTimeCols.indexOf(currentSettings.mainAxis) !== -1) {
        $('span.span_timeline').show();
    } else {
        $('span.span_timeline').hide();
        if (currentSettings.type === 'timeline') {
            $('input#radio_line').prop('checked', true);
            currentSettings.type = 'line';
        }
    }
    if (numericCols.indexOf(currentSettings.mainAxis) !== -1) {
        $('span.span_scatter').show();
    } else {
        $('span.span_scatter').hide();
        if (currentSettings.type === 'scatter') {
            $('input#radio_line').prop('checked', true);
            currentSettings.type = 'line';
        }
    }
    var xAxisTitle = $xAxisSelect.children('option:selected').text();
    $('input[name="xaxis_label"]').val(xAxisTitle);
    currentSettings.xaxisLabel = xAxisTitle;
}

function onDataSeriesChange () {
    var $seriesSelect = $('select[name="chartSeries"]');
    currentSettings.selectedSeries = getSelectedSeries();
    var yAxisTitle;
    if (currentSettings.selectedSeries.length === 1) {
        $('span.span_pie').show();
        yAxisTitle = $seriesSelect.children('option:selected').text();
    } else {
        $('span.span_pie').hide();
        if (currentSettings.type === 'pie') {
            $('input#radio_line').prop('checked', true);
            currentSettings.type = 'line';
        }
        yAxisTitle = Messages.strYValues;
    }
    $('input[name="yaxis_label"]').val(yAxisTitle);
    currentSettings.yaxisLabel = yAxisTitle;
}

/**
 * Unbind all event handlers before tearing down a page
 */
AJAX.registerTeardown('table/chart.js', function () {
    $('input[name="chartType"]').off('click');
    $('input[name="barStacked"]').off('click');
    $('input[name="chkAlternative"]').off('click');
    $('input[name="chartTitle"]').off('focus').off('keyup').off('blur');
    $('select[name="chartXAxis"]').off('change');
    $('select[name="chartSeries"]').off('change');
    $('select[name="chartSeriesColumn"]').off('change');
    $('select[name="chartValueColumn"]').off('change');
    $('input[name="xaxis_label"]').off('keyup');
    $('input[name="yaxis_label"]').off('keyup');
    $('#resizer').off('resizestop');
    $('#tblchartform').off('submit');
});

AJAX.registerOnload('table/chart.js', function () {
    // handle manual resize
    $('#resizer').on('resizestop', function () {
        // make room so that the handle will still appear
        $('#querychart').height($('#resizer').height() * 0.96);
        $('#querychart').width($('#resizer').width() * 0.96);
        if (currentChart !== null) {
            currentChart.redraw({
                resetAxes : true
            });
        }
    });

    // handle chart type changes
    $('input[name="chartType"]').on('click', function () {
        var type = currentSettings.type = $(this).val();
        if (type === 'bar' || type === 'column' || type === 'area') {
            $('span.barStacked').show();
        } else {
            $('input[name="barStacked"]').prop('checked', false);
            $.extend(true, currentSettings, { stackSeries : false });
            $('span.barStacked').hide();
        }
        drawChart();
    });

    // handle chosing alternative data format
    $('input[name="chkAlternative"]').on('click', function () {
        var $seriesColumn = $('select[name="chartSeriesColumn"]');
        var $valueColumn  = $('select[name="chartValueColumn"]');
        var $chartSeries  = $('select[name="chartSeries"]');
        if ($(this).is(':checked')) {
            $seriesColumn.prop('disabled', false);
            $valueColumn.prop('disabled', false);
            $chartSeries.prop('disabled', true);
            currentSettings.seriesColumn = parseInt($seriesColumn.val(), 10);
            currentSettings.valueColumn = parseInt($valueColumn.val(), 10);
        } else {
            $seriesColumn.prop('disabled', true);
            $valueColumn.prop('disabled', true);
            $chartSeries.prop('disabled', false);
            currentSettings.seriesColumn = null;
            currentSettings.valueColumn = null;
        }
        drawChart();
    });

    // handle stacking for bar, column and area charts
    $('input[name="barStacked"]').on('click', function () {
        if ($(this).is(':checked')) {
            $.extend(true, currentSettings, { stackSeries : true });
        } else {
            $.extend(true, currentSettings, { stackSeries : false });
        }
        drawChart();
    });

    // handle changes in chart title
    $('input[name="chartTitle"]')
        .on('focus', function () {
            tempChartTitle = $(this).val();
        })
        .on('keyup', function () {
            currentSettings.title = $('input[name="chartTitle"]').val();
            drawChart();
        })
        .on('blur', function () {
            if ($(this).val() !== tempChartTitle) {
                drawChart();
            }
        });

    // handle changing the x-axis
    $('select[name="chartXAxis"]').on('change', function () {
        onXAxisChange();
        drawChart();
    });

    // handle changing the selected data series
    $('select[name="chartSeries"]').on('change', function () {
        onDataSeriesChange();
        drawChart();
    });

    // handle changing the series column
    $('select[name="chartSeriesColumn"]').on('change', function () {
        currentSettings.seriesColumn = parseInt($(this).val(), 10);
        drawChart();
    });

    // handle changing the value column
    $('select[name="chartValueColumn"]').on('change', function () {
        currentSettings.valueColumn = parseInt($(this).val(), 10);
        drawChart();
    });

    // handle manual changes to the chart x-axis labels
    $('input[name="xaxis_label"]').on('keyup', function () {
        currentSettings.xaxisLabel = $(this).val();
        drawChart();
    });

    // handle manual changes to the chart y-axis labels
    $('input[name="yaxis_label"]').on('keyup', function () {
        currentSettings.yaxisLabel = $(this).val();
        drawChart();
    });

    // handler for ajax form submission
    $('#tblchartform').submit(function () {
        var $form = $(this);
        if (codeMirrorEditor) {
            $form[0].elements.sql_query.value = codeMirrorEditor.getValue();
        }
        if (!Functions.checkSqlQuery($form[0])) {
            return false;
        }

        var $msgbox = Functions.ajaxShowMessage();
        Functions.prepareForAjaxRequest($form);
        $.post($form.attr('action'), $form.serialize(), function (data) {
            if (typeof data !== 'undefined' &&
                    data.success === true &&
                    typeof data.chartData !== 'undefined') {
                chartData = JSON.parse(data.chartData);
                drawChart();
                Functions.ajaxRemoveMessage($msgbox);
            } else {
                Functions.ajaxShowMessage(data.error, false);
            }
        }, 'json'); // end $.post()

        return false;
    });

    // from jQuery UI
    $('#resizer').resizable({
        minHeight: 240,
        minWidth: 300
    })
        .width($('#div_view_options').width() - 50)
        .trigger('resizestop');

    currentSettings = {
        type : 'line',
        width : $('#resizer').width() - 20,
        height : $('#resizer').height() - 20,
        xaxisLabel : $('input[name="xaxis_label"]').val(),
        yaxisLabel : $('input[name="yaxis_label"]').val(),
        title : $('input[name="chartTitle"]').val(),
        stackSeries : false,
        mainAxis : parseInt($('select[name="chartXAxis"]').val(), 10),
        selectedSeries : getSelectedSeries(),
        seriesColumn : null
    };

    var vals = $('input[name="dateTimeCols"]').val().split(' ');
    $.each(vals, function (i, v) {
        dateTimeCols.push(parseInt(v, 10));
    });

    vals = $('input[name="numericCols"]').val().split(' ');
    $.each(vals, function (i, v) {
        numericCols.push(parseInt(v, 10));
    });

    onXAxisChange();
    onDataSeriesChange();

    $('#tblchartform').trigger('submit');
});
