package mongodb

import (
	"context"
	"errors"
	"gitea.russia9.dev/Russia9/chatwars-spy/pkg/domain"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"time"
)

func NewUserRepo(database *mongo.Database) domain.UserRepo {
	return &userRepo{Collection: database.Collection("users")}
}

type userRepo struct {
	Collection *mongo.Collection
}

func (r *userRepo) Store(ctx context.Context, object *domain.User) error {
	cursor := r.Collection.FindOne(ctx, bson.M{"_id": object.ID})
	if errors.Is(cursor.Err(), mongo.ErrNoDocuments) {
		object.FirstSeen = time.Now()
		object.LastSeen = time.Now()
		_, err := r.Collection.InsertOne(ctx, object)
		return err
	} else if cursor.Err() != nil {
		return cursor.Err()
	}

	// Get old user
	var old domain.User
	err := cursor.Decode(&old)
	if err != nil {
		return err
	}

	// Get old guild if empty
	if object.Guild == "" {
		object.Guild = old.Guild
	}

	// Set old source
	object.Source = old.Source

	// Set LastSeen date
	object.LastSeen = time.Now()

	// Update object in DB
	_, err = r.Collection.ReplaceOne(ctx, bson.M{"_id": object.ID}, object)
	return err
}