package formatter

import (
	"encoding/json"
	"io"

	"royalroadupdates/internal/royalroad"
)

// jsonEntry is the JSON output shape.
type jsonEntry struct {
	Name string `json:"name"`
	Date string `json:"date"`
}

// PrintJSON writes stories as JSON to w.
func PrintJSON(w io.Writer, stories []royalroad.Story) error {
	entries := make([]jsonEntry, 0, len(stories))
	for _, s := range stories {
		entries = append(entries, jsonEntry{
			Name: s.Name,
			Date: s.DateModified.UTC().Format("2006-01-02T15:04:05Z"),
		})
	}
	enc := json.NewEncoder(w)
	return enc.Encode(entries)
}