// Copyright (c) 2007 Legendum LLC
// This code may be used for free,
// provided this notice is included.

function Traffic(api, element)
{
    this.api = api;
    this.widget = new Widget(element);
    this.traffic = null;
    this.secs = 0;
    this.site = null;
    this.channel = null;
    this.date_requested = null;

    // Get a traffic report

    this.display = function(args)
    {
        this.site = args.site;
        this.channel = args.channel;
        this.date_requested = (args.date ? args.date : 0);
        this.widget.setName('Traffic');
        var query = '?token=' + this.api.getToken() + '&widget=traffic&site_id=' + args.site + '&channel_id=' + args.channel + '&date=' + args.date;
        if (!args.no_link) this.widget.setLink('mystats/widget.php' + query);
        if (!args.no_open) this.widget.setOpen('mystats/window.php' + query);
        this.widget.loading();
        args.report = 'traffic';
        args.callback = this.onChannelReports;
        this.api.getChannelReports(this, args, 300); // every 5 minutes
    }

    // Return a fraction to 1 decimal place

    this.fraction = function(num, div)
    {
        return div ? Math.round(10 * num / div) / 10 : 0.0; 
    }

    // Display the traffic report

    this.onChannelReports = function(channel)
    {
        var report = channel[0].report[0];

        // Get the traffic report data

        this.traffic = {users : 0, visits : 0, hits : 0, first_times : 0};
        var data = report.data; // a list of one
        var rows = data.length;
        for (var row = 0; row < rows; row++)
        {
            this.traffic[data[row].field] = data[row].value;
        }

        // Display the traffic report

        var date = report.start_date;
        this.widget.setDate(date);
        var html = '';
        html += this.traffic.users + " users<br>\n";
        if (this.traffic.users)
        {
            html += this.traffic.visits + ' visits (' + this.fraction(this.traffic.visits, this.traffic.users) + " per user)<br>\n";
            html += this.traffic.hits + ' page views (' + this.fraction(this.traffic.hits, this.traffic.visits) + " per visit)<br>\n";
            html += "<hr />\n";
            html += this.traffic.first_times + " new users<br>\n";
            html += this.traffic.users - this.traffic.first_times + " returning users<br>\n";
            if (this.traffic.campaign_visits)
                html += this.traffic.campaign_visits + " campaign clicks<br>\n";
        }
        this.widget.display(html);

        // Get last week's traffic to compare

        if (this.date_requested < 999) // relative date
        {
            this.secs = report.secs;
            var args = {site : this.site,
                        channel : this.channel,
                        report : 'traffic,hour_of_day_hits',
                        date : this.date_requested + 7,
                        callback : this.onLastWeek};

            this.api.getChannelReports(this, args);
        }
    }

    // Compare with last week's traffic

    this.onLastWeek = function(channel)
    {
        var traffic_report = channel[0].report[0];
        var hourly_report = channel[0].report[1];

        // Get last week's report data

        var last_week = {users : 0, visits : 0, hits : 0, first_times : 0};
        var data = traffic_report.data;
        var rows = data.length;
        for (var row = 0; row < rows; row++)
        {
            last_week[data[row].field] = data[row].value;
        }

        // Calculate returning users

        this.traffic.returning = this.traffic.users - this.traffic.first_times;
        last_week.returning = last_week.users - last_week.first_times;

        // Calculate percentage changes

        var forecast = this.widget.getForecast(hourly_report, this.secs);
        var first_times_arrow = this.widget.getArrow(this.traffic.first_times, last_week.first_times, forecast);
        var returning_arrow = this.widget.getArrow(this.traffic.returning, last_week.returning, forecast);
        var user_arrow = this.widget.getArrow(this.traffic.users, last_week.users, forecast);
        var campaign_arrow = this.widget.getArrow(this.traffic.campaign_visits, last_week.campaign_visits, forecast);
        var visit_arrow = this.widget.getArrow(this.traffic.visits, last_week.visits, forecast);
        var hit_arrow = this.widget.getArrow(this.traffic.hits, last_week.hits, forecast);

        var html = '';
        html += user_arrow + ' ' + this.traffic.users + " users<br>\n";
        html += visit_arrow + ' ' + this.traffic.visits + ' visits (' + this.fraction(this.traffic.visits, this.traffic.users) + " per user)<br>\n";
        html += hit_arrow + ' ' + this.traffic.hits + ' page views (' + this.fraction(this.traffic.hits, this.traffic.visits) + " per visit)<br>\n";
        html += "<hr />\n";
        html += first_times_arrow + ' ' + this.traffic.first_times + " new users<br>\n";
        html += returning_arrow + ' ' + this.traffic.returning + " returning users<br>\n";
        if (this.traffic.campaign_visits)
            html += campaign_arrow + ' ' + this.traffic.campaign_visits + " campaign clicks<br>\n";
        html += '<div class="widget_info">Comparing same day last week</div>';
        this.widget.display(html);
    }
};