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// Copyright 2017 FoxyUtils ehf. All rights reserved.
package main

import (
	"fmt"
	"log"
	"os"

	"github.com/unidoc/unioffice/chart"
	"github.com/unidoc/unioffice/common/license"
	"github.com/unidoc/unioffice/spreadsheet"
)

func init() {
	// Make sure to load your metered License API key prior to using the library.
	// If you need a key, you can sign up and create a free one at https://cloud.unidoc.io
	err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
	if err != nil {
		panic(err)
	}
}

func main() {
	ss := spreadsheet.New()
	defer ss.Close()
	sheet := ss.AddSheet()

	// Create all of our data
	row := sheet.AddRow()
	row.AddCell().SetString("Item")
	row.AddCell().SetString("Price")
	row.AddCell().SetString("# Sold")
	row.AddCell().SetString("Total")
	for r := 0; r < 5; r++ {
		row := sheet.AddRow()
		row.AddCell().SetString(fmt.Sprintf("Product %d", r+1))
		row.AddCell().SetNumber(1.23 * float64(r+1))
		row.AddCell().SetNumber(float64(r%3 + 1))
		row.AddCell().SetFormulaRaw(fmt.Sprintf("C%d*B%d", r+2, r+2))
	}

	// Charts need to reside in a drawing
	dwng := ss.AddDrawing()
	chrt1, anc1 := dwng.AddChart(spreadsheet.AnchorTypeTwoCell)
	chrt2, anc2 := dwng.AddChart(spreadsheet.AnchorTypeTwoCell)
	addBarChart(chrt1)
	addLineChart(chrt2)
	anc1.SetWidth(9)
	anc1.MoveTo(5, 1)
	anc2.MoveTo(1, 23)

	// and finally add the chart to the sheet
	sheet.SetDrawing(dwng)

	if err := ss.Validate(); err != nil {
		log.Fatalf("error validating sheet: %s", err)
	}
	ss.SaveToFile("multiple-chart.xlsx")
}

func addBarChart(chrt chart.Chart) {
	chrt.AddTitle().SetText("Bar Chart")
	lc := chrt.AddBarChart()
	priceSeries := lc.AddSeries()
	priceSeries.SetText("Price")
	// Set a category axis reference on the first series to pull the product names
	priceSeries.CategoryAxis().SetLabelReference(`'Sheet 1'!A2:A6`)
	priceSeries.Values().SetReference(`'Sheet 1'!B2:B6`)

	soldSeries := lc.AddSeries()
	soldSeries.SetText("Sold")
	soldSeries.Values().SetReference(`'Sheet 1'!C2:C6`)

	totalSeries := lc.AddSeries()
	totalSeries.SetText("Total")
	totalSeries.Values().SetReference(`'Sheet 1'!D2:D6`)

	// the line chart accepts up to two axes
	ca := chrt.AddCategoryAxis()
	va := chrt.AddValueAxis()
	lc.AddAxis(ca)
	lc.AddAxis(va)

	ca.SetCrosses(va)
	va.SetCrosses(ca)
}

func addLineChart(chrt chart.Chart) {
	chrt.AddTitle().SetText("Line Chart")
	lc := chrt.AddLineChart()
	priceSeries := lc.AddSeries()
	priceSeries.SetText("Price")
	// Set a category axis reference on the first series to pull the product names
	priceSeries.CategoryAxis().SetLabelReference(`'Sheet 1'!A2:A6`)
	priceSeries.Values().SetReference(`'Sheet 1'!B2:B6`)

	soldSeries := lc.AddSeries()
	soldSeries.SetText("Sold")
	soldSeries.Values().SetReference(`'Sheet 1'!C2:C6`)

	totalSeries := lc.AddSeries()
	totalSeries.SetText("Total")
	totalSeries.Values().SetReference(`'Sheet 1'!D2:D6`)

	// the line chart accepts up to two axes
	ca := chrt.AddCategoryAxis()
	va := chrt.AddValueAxis()
	lc.AddAxis(ca)
	lc.AddAxis(va)

	ca.SetCrosses(va)
	va.SetCrosses(ca)
}