package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
	"sync"
	"time"
)

var (
	full_name string
	lang_from string
	lang_to   string
)

const (
	FIRST_LINES = 5
)

func main() {
	f, err := os.OpenFile("dict.xdxf", os.O_RDONLY, os.ModePerm)
	if err != nil {
		log.Fatalf("open file error: %v", err)
		return
	}
	defer f.Close()

	fullFile(f)
}

func fullFile(file *os.File) {
	sc := bufio.NewScanner(file)
	/*for sc.Scan() {
		fmt.Println(sc.Text())
	}*/
	if err := sc.Err(); err != nil {
		log.Fatalf("scan file error: %v", err)
		return
	}

	//skip first lines with some unnessesary data and save full name
	first:=""
	for sc.Scan() {
		line := sc.Text()
		if strings.Contains(line, "<full_name>") {
			line = strings.ReplaceAll(line, "full_name>", "")
			line = strings.ReplaceAll(line, "</", "")
			full_name = strings.ReplaceAll(line, "<", "")
			
		}
		if strings.Contains(line, "lang_from=") && strings.Contains(line, "lang_to=") {
			tmp := strings.Split(line, "=")
			lang_from = strings.Split(tmp[1], " ")[0]
			lang_to = strings.Split(tmp[2], " ")[0]
		}
		if strings.Contains(line, "<ar><k>") {
			first= line
			break
		}
	}

	fmt.Printf("Dict name: %s.\n", full_name)
	fmt.Printf("From %s to %s. \n", lang_from, lang_to)
	fmt.Println(first)
	// read file line by line
	var (
		word          string
		translation   string
		transcription string
	)

	for sc.Scan() {
		line := sc.Text()
		if strings.Contains(line, "<ar>") {
			word = ""
			translation = ""
			transcription = ""
			fmt.Println(word, translation, transcription)
		}
		if strings.Contains(line, "<k>") {
			_, word, _ = strings.Cut(line, "<k>")
		}
		fmt.Println(sc.Text())
	}
}

func processChunk(chunk []byte, linesPool *sync.Pool, stringPool *sync.Pool, start time.Time, end time.Time) {

}

//readFile opens file in chunks and process to other func. https://medium.com/swlh/processing-16gb-file-in-seconds-go-lang-3982c235dfa2
func readFile() {

}