package main

import (
	"encoding/csv"
	"fmt"
	"io"
	"log"
	"os"
	"strconv"
)

const STX = rune(2)
const CR = rune(13)
const LF = rune(10)

func text(w io.Writer, data string, y int, x int) {
	result, err := fmt.Fprintf(w, "1122000%04d%04d%s%s", x, y, data, string(CR))
	//log.Printf("1122000%04d%04d%s%s", x, y, data, string(CR))
	log.Print(result, err)
}

func sendRaw(w io.Writer, data string) {
	result, err := fmt.Fprintf(w, "%s%s", data, string(CR))
	//log.Printf("%s%s", data, string(CR))
	log.Print(result, err)
}

func start(w io.Writer) {
	sendRaw(w, string(STX)+"L")
	sendRaw(w, "C0015")
	sendRaw(w, "D11")
	sendRaw(w, "PE")
	sendRaw(w, "H11")
}

func close(w io.Writer) {
	sendRaw(w, "Q0001")
	sendRaw(w, "E")
}

func code(w io.Writer, cid int, y int, x int) {
	result, err := fmt.Fprintf(w, "1B00035%04d%04d%011d%s", x, y, cid, string(CR))
	//log.Printf("1B00000%04d%04d%011d%s", x, y, cid, string(CR))
	log.Print(result, err)
}

func loadAndPrintCSV(w io.Writer) {
	f, err := os.OpenFile("./eventos.csv", os.O_RDONLY, os.ModeAppend)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	r := csv.NewReader(f)
	for {
		record, err := r.Read()
		if err == io.EOF {
			break
		}
		if err != nil {
			log.Fatal(err)
		}

		c, _ := strconv.Atoi(record[1])

		start(w)
		text(w, record[0], 20, 80)
		code(w, c, 20, 10)
		close(w)
	}
}

func main() {
	f, err := os.OpenFile("/dev/usb/lp0", os.O_WRONLY, os.ModeDevice)
	if err != nil {
		panic(err)
	}
	defer f.Close()
	loadAndPrintCSV(f)
}