package stories

import (
	"crypto/rand"
	"encoding/binary"
	"strconv"

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

var collection *mgo.Collection

func find(query interface{}) (*models.Story, error) {
	story := models.Story{}
	err := collection.Find(query).One(&story)
	if err != nil {
		return nil, err
	}

	return &story, err
}

func list(query interface{}, limit int) ([]models.Story, error) {
	stories := make([]models.Story, 0, 64)
	err := collection.Find(query).Limit(limit).Sort("-updatedDate").All(&stories)

	return stories, err
}

// makeStoryID makes a random story ID that's 16 characters long
func makeStoryID() string {
	result := "S"
	offset := 0
	data := make([]byte, 32)

	rand.Read(data)
	for len(result) < 16 {
		result += strconv.FormatUint(binary.LittleEndian.Uint64(data[offset:]), 36)
		offset += 8

		if offset >= 32 {
			rand.Read(data)
			offset = 0
		}
	}

	return result[:16]
}

func init() {
	store.HandleInit(func(db *mgo.Database) {
		collection = db.C("story.stories")

		collection.EnsureIndexKey("tags")
		collection.EnsureIndexKey("author")
		collection.EnsureIndexKey("updatedDate")
		collection.EnsureIndexKey("fictionalDate")
		collection.EnsureIndexKey("listed")
	})
}