package parser

import (
	"encoding/csv"
	"errors"
	"fmt"
	"io"
	"os"

	"git.ctrlz.es/mgdelacroix/birthdaybot/model"
)

func ParseCSV(path string) ([]*model.Birthday, error) {
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	reader := csv.NewReader(f)

	birthdays := []*model.Birthday{}
	lineno := 0
	for {
		lineno++
		record, err := reader.Read()
		if errors.Is(err, io.EOF) {
			break
		}
		if err != nil {
			return nil, fmt.Errorf("error reading lineno %d: %w", lineno, err)
		}

		birthday, err := model.NewBirthdayFromRecord(record)
		if err != nil {
			return nil, fmt.Errorf("error parsing record for line %d into birthday: %w", lineno, err)
		}
		birthdays = append(birthdays, birthday)
	}

	return birthdays, nil
}