package mongo

import (
	"context"
	"time"
	"fmt"

	"go.mongodb.org/mongo-driver/v2/bson"
	"github.com/matoous/go-nanoid/v2"

	// "git.gsuntres.com/boxtep/boxtep/core"
)

const alphabet = "0123456789abcdefghijclmnopqrstuvwxyz"

const maxLen = 10

// InsertOneWithStruct can be used to insert defined structs.
func (c *MongoClient) InsertOneFromStruct(ctx context.Context, database, name string, data any) (bson.M, error) {
	o, err := ToMap(data)
	if err != nil {
		return nil, err
	}

	return c.InsertOne(ctx, database, name, o)
}

// InsertOne will add missing ids and the created date before saving to the database.
func (c *MongoClient) InsertOne(ctx context.Context, database, name string, data bson.M) (bson.M, error) {
	collection := c.GetCollection(database, name)

	prepareForInsert(data, c.GetIdPrefix(name))

	if _, err := collection.InsertOne(ctx, data); err != nil {
		return nil, err
	}

	return data, nil
}

// prepareForInsert takes a map[string]any and:
//	* adds a new _id if property does not exist or is an empty string
//	* adds/updates property created_at using the current timestamp.
func prepareForInsert(data bson.M, idPrefix string) {
	ensureId(data, idPrefix)
	ensureCreatedAt(data)
	ensureUpdatedAt(data)
}

// ensureId adds the id property when missing or when it's an empty string.
func ensureId(data bson.M, idPrefix string) string {
	maybeId, hasId := data["_id"]

	var id, finalId string
	if !hasId || maybeId == "" {
		id, _ = gonanoid.Generate(alphabet, maxLen)
		if idPrefix != "" {
			finalId = fmt.Sprintf("%s_%s", idPrefix, id)
		} else {
			finalId = id
		}

		data["_id"] = finalId
	}

	return finalId
}

func ensureCreatedAt(data bson.M) time.Time {
	now := time.Now().UTC().Truncate(time.Millisecond)

	data["created_at"] = now

	return now
}

func ensureUpdatedAt(data bson.M) time.Time {
	now := time.Now().UTC().Truncate(time.Millisecond)

	data["updated_at"] = now

	return now
}