package processing

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"regexp"

	models "gitea.likemath.ru/alex/gogrep/internal/models"
)

// ProcessSingleFile processes file and send it Result to channel
func ProcessSingleFile(rePattern regexp.Regexp, path string, out chan models.FileMatchData) {
	file, err := os.Open(path)
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	res := models.FileMatchData{Path: path, LineIndexes: make([]int, 0), Lines: make([]string, 0)}
	scanner := bufio.NewScanner(file)
	// optionally, resize scanner's capacity for lines over 64K, see next example
	curLineInd := 1
	for scanner.Scan() {
		lineText := scanner.Text()
		if rePattern.FindString(lineText) != "" {
			res.LineIndexes = append(res.LineIndexes, curLineInd)
			res.Lines = append(res.Lines, lineText)
		}
		curLineInd++
	}

	if err := scanner.Err(); err != nil {
		fmt.Printf("Error %v with file %v\n", err, path)
	}
	out <- res
}