package feed

import (
	"net/http"
	"strings"
	"time"
)

type lobstersPostResponseJson struct {
	ShortID          string   `json:"short_id"`
	ShortIDURL       string   `json:"short_id_url"`
	CreatedAt        string   `json:"created_at"`
	Title            string   `json:"title"`
	URL              string   `json:"url"`
	Score            int      `json:"score"`
	Flags            int      `json:"flags"`
	CommentCount     int      `json:"comment_count"`
	Description      string   `json:"description"`
	DescriptionPlain string   `json:"description_plain"`
	CommentsURL      string   `json:"comments_url"`
	SubmitterUser    string   `json:"submitter_user"`
	UserIsAuthor     bool     `json:"user_is_author"`
	Tags             []string `json:"tags"`
}

type lobstersFeedResponseJson []lobstersPostResponseJson

func getLobstersPostsFromFeed(feedUrl string) (ForumPosts, error) {
	request, err := http.NewRequest("GET", feedUrl, nil)

	if err != nil {
		return nil, err
	}

	feed, err := decodeJsonFromRequest[lobstersFeedResponseJson](defaultClient, request)

	if err != nil {
		return nil, err
	}

	posts := make(ForumPosts, 0, len(feed))

	for i := range feed {
		tags := strings.Join(feed[i].Tags, ",")

		if tags != "" {
			tags = " [" + tags + "]"
		}

		createdAt, _ := time.Parse(time.RFC3339, feed[i].CreatedAt)

		posts = append(posts, ForumPost{
			Title:           feed[i].Title + tags,
			DiscussionUrl:   feed[i].CommentsURL,
			TargetUrl:       feed[i].URL,
			TargetUrlDomain: extractDomainFromUrl(feed[i].URL),
			CommentCount:    feed[i].CommentCount,
			Score:           feed[i].Score,
			TimePosted:      createdAt,
		})
	}

	if len(posts) == 0 {
		return nil, ErrNoContent
	}

	return posts, nil
}

func FetchLobstersTopPosts(feedUrl string) (ForumPosts, error) {
	posts, err := getLobstersPostsFromFeed(feedUrl)

	if err != nil {
		return nil, err
	}

	return posts, nil
}