package cat

import (
	"bufio"
	"io"
	"os"
	"path"
	"strings"
)

func (c Cater) dir(dir string) error {
	files, err := os.ReadDir(dir)
	if err != nil {
		return err
	}

	for _, file := range files {
		i, err := file.Info()
		if err != nil {
			continue
		}
		path := path.Join(dir, i.Name())

		if !file.IsDir() {
			c.file(path)
		} else {
			c.dir(path)
		}
	}
	return nil
}

func (c Cater) file(filePath string) error {
	file, err := os.Open(filePath)
	if err != nil {
		return err
	}
	defer file.Close()

	// read file into strings.Builder
	var sb strings.Builder
	reader := bufio.NewReader(file)

	for {
		line, err := reader.ReadString('\n')
		if err != nil && err != io.EOF {
			return err
		}
		sb.WriteString(line)
		if err == io.EOF {
			break
		}
	}

	c[filePath] = sb.String()

	return nil
}