package head

import (
	"bbash/environment"
	"bbash/input_parser"
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func Head(in input_parser.Input, env *environment.Env) {
	args := strings.SplitN(in.Args_raw, " ", 2)
	var file_path string
	var lines int
	if len(args) >= 1 {
		file_path = strings.TrimSpace(args[0])
		lines = 10
	} else {
		fmt.Print(fmt.Sprintf("No arguments provided"))
		return
	} 
	if len(args) == 2 {
		lines1, err := strconv.Atoi(strings.TrimSpace(args[1]))
		lines = lines1
		if err != nil {
			fmt.Print(fmt.Sprintf("Second argument must be a integer"))
			return
		}
	} 
	file, err := os.Open(file_path)
	if err != nil {
		fmt.Println(fmt.Sprintf("Error opening file: %s", err.Error()))
		return
	}
	defer file.Close()
	scanner := bufio.NewScanner(file)
	for i := 0; i < lines-1; i++ {
		if(!scanner.Scan()) {
			return
		}
		fmt.Println(scanner.Text())
	}
	scanner.Scan()
	fmt.Print(scanner.Text())
}