package queries

import (
	"context"
	"time"

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

// StoriesArg is args for stories query
type StoriesArg struct {
	Filter *struct {
		Author *string
		Tags   *[]struct {
			Kind string
			Name string
		}
		EarliestFictionalDate *string
		LatestFictionalDate   *string
		Category              *string
		Limit                 *int32
		Open                  *bool
		Unlisted              *bool
	}
}

// Stories resolves the stories query
func (r *QueryResolver) Stories(ctx context.Context, args *StoriesArg) ([]*types.StoryResolver, error) {
	var err error

	token := auth.TokenFromContext(ctx)

	filter := args.Filter

	author := ""
	category := ""
	tags := make([]story.Tag, 0, 8)
	earliest := time.Time{}
	latest := time.Time{}
	unlisted := false
	open := (*bool)(nil)
	limit := 0

	if filter != nil {
		if filter.Author != nil {
			author = *filter.Author
		}

		if filter.Category != nil {
			category = *filter.Category
		}

		if filter.Tags != nil {
			for _, tagInput := range *filter.Tags {
				tags = append(tags, story.Tag{
					Kind: tagInput.Kind,
					Name: tagInput.Name,
				})
			}
		}

		if filter.EarliestFictionalDate != nil {
			earliest, err = time.Parse(time.RFC3339Nano, *filter.EarliestFictionalDate)
			if err != nil {
				return nil, err
			}
		}

		if filter.LatestFictionalDate != nil {
			latest, err = time.Parse(time.RFC3339Nano, *filter.LatestFictionalDate)
			if err != nil {
				return nil, err
			}
		}

		if filter.Limit != nil {
			limit = int(*filter.Limit)
		}

		unlisted = filter.Unlisted != nil && *filter.Unlisted == true
		if unlisted {
			if token == nil {
				return nil, ErrUnauthorized
			}

			if author != "" && author != token.UserID && !token.Permitted("story.unlisted") {
				return nil, ErrPermissionDenied
			}

			author = token.UserID
		}

		open = filter.Open
	}

	stories, err := story.List(author, category, tags, earliest, latest, unlisted, open, limit)
	if err != nil {
		return nil, err
	}

	resolvers := make([]*types.StoryResolver, len(stories))
	for i, story := range stories {
		resolvers[i] = &types.StoryResolver{S: story}
	}

	return resolvers, nil
}