package changes

import (
	"time"

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

// Filter is a filter for changes.List.
type Filter struct {
	Keys         []models.ChangeKey
	EarliestDate *time.Time
	Limit        *int
}

// List lists changes.
func List(filter *Filter) ([]models.Change, error) {
	query := bson.M{}
	limit := 0

	if filter != nil {
		if filter.Limit != nil {
			limit = *filter.Limit
		}

		if filter.Keys != nil {
			query["keys"] = bson.M{"$in": filter.Keys}
		} else {
			query["listed"] = true
		}

		if filter.EarliestDate != nil {
			query["date"] = bson.M{"$gte": *filter.EarliestDate}
		}
	} else {
		query["listed"] = true
		limit = 256
	}

	return list(query, limit)
}