package queries

import (
	"context"
	"time"

	"git.aiterp.net/rpdata/api/graphql/resolver/types"
	"git.aiterp.net/rpdata/api/internal/session"
	"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) {
	filter := args.Filter

	author := ""
	if filter != nil && filter.Author != nil {
		author = *filter.Author
	}

	category := ""
	if filter != nil && filter.Category != nil {
		category = *filter.Category
	}

	tags := make([]story.Tag, 0, 8)
	if filter != nil && filter.Tags != nil {
		for _, tagInput := range *filter.Tags {
			tags = append(tags, story.Tag{
				Kind: tagInput.Kind,
				Name: tagInput.Name,
			})
		}
	}

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

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

	unlisted := filter.Unlisted != nil && *filter.Unlisted == true
	if unlisted {
		user := session.FromContext(ctx).User()
		if user == nil {
			return nil, ErrUnauthorized
		}

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

		author = user.ID
	}

	open := filter.Open

	limit := 0
	if filter != nil && filter.Limit != nil {
		limit = int(*filter.Limit)
	}

	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
}