package cv

import (
	"encoding/json"
	"fmt"
	"os"
	"time"
)

// NewCVFromFile returns a new CV value from the given JSON file.
func NewCVFromFile(path string) (CV, error) {
	file, err := os.Open(path)
	if err != nil {
		return CV{}, fmt.Errorf("unable to open %s; %w", path, err)
	}
	defer file.Close()

	decoder := json.NewDecoder(file)

	var output CV

	if err = decoder.Decode(&output); err != nil {
		return CV{}, fmt.Errorf("unable to decode JSON data; %w", err)
	}

	return output, nil
}

// NewCV returns a new value of type CV.
func NewCV(firstName, lastName, jobTitle string) CV {
	output := CV{
		FirstName: firstName,
		LastName:  lastName,
		JobTitle:  jobTitle,
	}

	return output
}

// After returns true if the Duration's end date is set after the earliest experience date.
// An error is returned if the end date is not parsed successfully.
func (d Duration) After(earliestExperienceDate time.Time) (bool, error) {
	endDate, err := d.End.Parse()
	if err != nil {
		return false, err
	}

	return endDate.After(earliestExperienceDate), nil
}

// Parse parses Date and returns a value of type time.Time.
// An error is returned if the parsing fails.
func (d Date) Parse() (time.Time, error) {
	dateStr := fmt.Sprintf("%d-%02d-%02d", d.Year, d.Month, d.Day)

	date, err := time.Parse(time.DateOnly, dateStr)
	if err != nil {
		return time.Time{}, fmt.Errorf("unable to parse the date; %w", err)
	}

	return date, nil
}