package mutations

import (
	"context"
	"time"

	"git.aiterp.net/rpdata/api/graphql/resolver/types"
	"git.aiterp.net/rpdata/api/internal/session"
	"git.aiterp.net/rpdata/api/model/change"
	"git.aiterp.net/rpdata/api/model/story"
)

// AddChapterArgs is args for the addChapter mutation
type AddChapterArgs struct {
	Input *struct {
		StoryID       string
		Title         string
		Author        *string
		Source        string
		FictionalDate *string
	}
}

// AddChapter resolves the addChapter mutation
func (r *MutationResolver) AddChapter(ctx context.Context, args *AddChapterArgs) (*types.ChapterResolver, error) {
	input := args.Input

	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member", "chapter.add") {
		return nil, ErrUnauthorized
	}

	story, err := story.FindID(input.StoryID)
	if err != nil {
		return nil, err
	}

	author := user.ID
	if input.Author != nil {
		author = *input.Author

		if user.ID != author && !user.Permitted("chapter.add") {
			return nil, ErrPermissionDenied
		}
	}

	fictionalDate := time.Time{}
	if input.FictionalDate != nil {
		fictionalDate, err = time.Parse(time.RFC3339Nano, *input.FictionalDate)
		if err != nil {
			return nil, err
		}
	}

	chapter, err := story.AddChapter(input.Title, author, input.Source, time.Now(), fictionalDate)
	if err != nil {
		return nil, err
	}

	go change.Submit("Chapter", "add", user.ID, chapter.ID, map[string]interface{}{
		"title":         input.Title,
		"author":        author,
		"fictionalDate": fictionalDate,
	})

	return &types.ChapterResolver{C: chapter}, nil
}