package main

import (
	"bufio"
	"fmt"
	"os"
)

func IsExistFile(path string) error {
	if _, err := os.Stat(path); os.IsNotExist(err) {
		message := fmt.Sprintf("File does not exist : %s", err)
		fmt.Println(message)
		os.Exit(1)
	}
	return nil
}

func CheckErrorFile(err error) error {
	if err != nil {
		message := fmt.Sprintf("Error creating file : %s", err)
		fmt.Println(message)
		os.Exit(1)
	}
	return nil
}

func main() {
	home := os.Getenv("HOME")
	orgFile := home + "/Documents/orgfiles/rss.org"
	newsboatFile := home + "/Config/private/newsboat/urls"

	IsExistFile(orgFile)
	data, err := os.Open(orgFile)
	CheckErrorFile(err)

	IsExistFile(newsboatFile)
	file, err := os.Create(newsboatFile)
	CheckErrorFile(err)

	var counter int
	lexer := Lexer{}
	scanner := bufio.NewScanner(data)

	for scanner.Scan() {
		counter++

		// skip the first heading
		if counter == 1 {
			continue
		}

		tokens := lexer.Process(scanner.Text())
		feed := Parse(tokens).String()
		file.WriteString(feed)
	}

	file.Close()
	data.Close()

	fmt.Printf("%d feed(s) written to the file (%s)\n", counter, newsboatFile)
}