package goCharts

/*
*
@author: sre
@date: 2022/9/17 0017
@desc: todo
*
*/

import (
	"github.com/vicanso/go-charts/v2"
	"math/rand"
	"time"
)

func getRand(len int) []float64 {
	var res []float64
	for i := 0; i < len; i++ {
		randFloat := float64(rand.Intn(1000))
		res = append(res, randFloat)
	}
	return res
}

func Draw() {
	values := [][]float64{
		getRand(30),
		getRand(30),
		getRand(30),
		getRand(30),
	}
	p, err := charts.LineRender(
		values,
		//charts.SVGTypeOption(),
		charts.ThemeOptionFunc(charts.ThemeGrafana),
		charts.WidthOptionFunc(720),
		charts.HeightOptionFunc(1280),
		charts.TitleTextOptionFunc("symbol price"),
		charts.XAxisDataOptionFunc(getLastDays(30)),
		charts.LegendLabelsOptionFunc([]string{
			"BTC",
			"ETH",
			"BNB",
			"TRX",
		}, "150"),
		func(opt *charts.ChartOption) {
			opt.Legend.Padding = charts.Box{
				Top:    5,
				Bottom: 10,
			}
			opt.SymbolShow = charts.FalseFlag()
			opt.LineStrokeWidth = 1
		},
	)

	if err != nil {
		panic(err)
	}

	buf, err := p.Bytes()
	if err != nil {
		panic(err)
	}
	err = writeFile(buf)
	if err != nil {
		panic(err)
	}
}

func getLastDays(len int) []string {
	now := time.Now()
	getDay := func(t time.Time, dif int) string {
		return t.AddDate(0, 0, dif).Format("01/02")
	}
	var res []string
	for i := 1; i <= len; i++ {
		res = append(res, getDay(now, i-len))
	}
	return res
}