package posts

import (
	"strings"

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

// Filter is used to generate a query to the database.
type Filter struct {
	ID     []string
	Kind   []string
	LogID  *string
	Search *string
	Limit  int
}

// List lists the posts according to the filter
func List(filter *Filter) ([]models.Post, error) {
	mutex.RLock()
	defer mutex.RUnlock()

	limit := 256
	query := bson.M{}

	if filter != nil {
		if filter.LogID != nil {
			query["logId"] = filter.LogID
		}

		if len(filter.ID) > 1 {
			query["_id"] = bson.M{"$in": filter.ID}
		} else if len(filter.ID) == 1 {
			query["_id"] = filter.ID[0]
		}

		if len(filter.Kind) > 1 {
			for i := range filter.Kind {
				filter.Kind[i] = strings.ToLower(filter.Kind[i])
			}

			query["kind"] = bson.M{"$in": filter.Kind}
		} else if len(filter.Kind) == 1 {
			query["kind"] = strings.ToLower(filter.Kind[0])
		}

		limit = filter.Limit
	}

	posts, err := list(query, limit, "position")
	if err != nil {
		return nil, err
	}

	return posts, nil
}