package dict

import (
	"bufio"
	"io"
	"strings"
)

func LoadDict[V any](r io.Reader, f func(l string) (string, V)) (*Dict[V], error) {
	//var d *Dict[V]
	//
	//if l, err := linesNotEmpty(r); err != nil {
	//	return nil, err
	//} else {
	//	d = NewDict[V](l)
	//}

	d := NewDict[V]()

	scanner := bufio.NewScanner(r)

	for scanner.Scan() {
		line := scanner.Text()

		if err := scanner.Err(); err != nil {
			return nil, err
		}

		k, v := f(line)

		d.Set(k, v)
	}

	return d, nil
}

func linesNotEmpty(r io.Reader) (int, error) {
	scanner := bufio.NewScanner(r)

	count := 0

	for scanner.Scan() {
		line := scanner.Text()

		if strings.TrimSpace(line) != "" {
			count++
		}
	}

	if err := scanner.Err(); err != nil {
		return 0, err
	}

	return count, nil
}