package stories

import (
	"time"

	"git.aiterp.net/rpdata/api/models"
	"github.com/globalsign/mgo/bson"
)

// Filter for stories.List
type Filter struct {
	Author                *string
	Tags                  []models.Tag
	EarliestFictionalDate time.Time
	LatestFictionalDate   time.Time
	Category              *models.StoryCategory
	Open                  *bool
	Unlisted              *bool
	Limit                 int
}

// List lists stories by any non-zero criteria passed with it.
func List(filter *Filter) ([]models.Story, error) {
	query := bson.M{"listed": true}
	limit := 0

	if filter != nil {
		if filter.Author != nil {
			query["author"] = *filter.Author
		}

		if len(filter.Tags) > 0 {
			query["tags"] = bson.M{"$in": filter.Tags}
		}

		if !filter.EarliestFictionalDate.IsZero() && !filter.LatestFictionalDate.IsZero() {
			query["fictionalDate"] = bson.M{
				"$gte": filter.EarliestFictionalDate,
				"$lt":  filter.LatestFictionalDate,
			}
		} else if !filter.LatestFictionalDate.IsZero() {
			query["fictionalDate"] = bson.M{
				"$lt": filter.LatestFictionalDate,
			}
		} else if !filter.EarliestFictionalDate.IsZero() {
			query["fictionalDate"] = bson.M{
				"$gte": filter.EarliestFictionalDate,
			}
		}

		if filter.Category != nil {
			query["category"] = *filter.Category
		}

		if filter.Open != nil {
			query["open"] = *filter.Open
		}

		if filter.Unlisted != nil {
			query["listed"] = !*filter.Unlisted
		}

		limit = filter.Limit
	}

	return list(query, limit)
}