package posts

import (
	"context"
	"strings"
	"time"

	"lmika.dev/lmika/weiro/models"
	"lmika.dev/lmika/weiro/providers/db"
)

type CreatePostParams struct {
	GUID   string `form:"guid" json:"guid"`
	Title  string `form:"title" json:"title"`
	Body   string `form:"body" json:"body"`
	Action string `form:"action" json:"action"`
}

func (s *Service) UpdatePost(ctx context.Context, params CreatePostParams) (*models.Post, error) {
	now := time.Now()

	site, ok := models.GetSite(ctx)
	if !ok {
		return nil, models.SiteRequiredError
	}

	post, err := s.fetchOrCreatePost(ctx, site, params)
	if err != nil {
		return nil, err
	}

	post.Title = params.Title
	post.Body = params.Body
	post.UpdatedAt = now
	post.Slug = post.BestSlug()
	oldState := post.State

	switch strings.ToLower(params.Action) {
	case "publish":
		post.State = models.StatePublished
		post.PublishedAt = now
	case "save draft":
		post.State = models.StateDraft
		post.PublishedAt = time.Time{}
	default:
		// Leave unchanged
	}

	if err := s.db.SavePost(ctx, post); err != nil {
		return nil, err
	}

	if oldState != post.State || post.State == models.StatePublished {
		s.publisher.Queue(site)
	}

	return post, nil
}

func (s *Service) fetchOrCreatePost(ctx context.Context, site models.Site, params CreatePostParams) (*models.Post, error) {
	post, err := s.db.SelectPostByGUID(ctx, params.GUID)
	if err == nil {
		if post.SiteID != site.ID {
			return nil, models.NotFoundError
		}

		return post, nil
	} else if !db.ErrorIsNoRows(err) {
		return nil, err
	}

	post = &models.Post{
		SiteID:    site.ID,
		GUID:      params.GUID,
		Title:     params.Title,
		Body:      params.Body,
		State:     models.StateDraft,
		CreatedAt: time.Now(),
	}
	return post, nil
}