package main

import (
	"bufio"
	"bytes"
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

	"github.com/wcharczuk/go-chart"
	"github.com/wcharczuk/go-chart/drawing"
)

func drawChart(res http.ResponseWriter, req *http.Request) {
	xv, yv := data()

	times := chart.TimeSeries{
		Name:    "Elapsed ms",
		XValues: xv,
		YValues: yv,
	}

	tma := chart.SMASeries{
		Style: chart.Style{
			Show:            true,
			StrokeColor:     drawing.ColorRed,
			StrokeDashArray: []float64{5.0, 5.0},
		},
		InnerSeries: times,
		Period:      50,
	}

	graph := chart.Chart{
		XAxis: chart.XAxis{
			Style:          chart.Style{Show: true},
			ValueFormatter: chart.TimeMinuteValueFormatter,
		},
		YAxis: chart.YAxis{
			Style: chart.Style{Show: true},
			ValueFormatter: func(v interface{}) string {
				if typed, isTyped := v.(float64); isTyped {
					return fmt.Sprintf("%0.2fms", typed)
				}
				return ""
			},
		},
		Series: []chart.Series{
			times,
			tma,
		},
	}

	res.Header().Set("Content-Type", "image/svg+xml")
	graph.Render(chart.SVG, res)
}

func main() {
	http.HandleFunc("/", drawChart)
	http.ListenAndServe(":8080", nil)
}

func data() ([]time.Time, []float64) {
	var timestamps []time.Time
	var elapsed []float64

	scanner := bufio.NewScanner(bytes.NewBuffer([]byte(rawData)))
	scanner.Split(bufio.ScanLines)
	for scanner.Scan() {
		pieces := strings.Split(scanner.Text(), ",")

		hour, _ := strconv.Atoi(pieces[0])
		minute, _ := strconv.Atoi(pieces[1])
		second, _ := strconv.Atoi(pieces[2])

		now := time.Now().UTC()
		timestamps = append(timestamps, time.Date(now.Year(), now.Month(), now.Day(), hour, minute, second, 0, time.UTC))

		parsedElapsed, err := strconv.ParseFloat(pieces[3], 64)
		if err == nil {
			elapsed = append(elapsed, parsedElapsed/1000.0)
		} else {
			println(err.Error())
		}
	}
	return timestamps, elapsed
}

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