package db

import (
	"context"
	"fmt"
	"time"

	"go.mongodb.org/mongo-driver/v2/mongo"
	"go.mongodb.org/mongo-driver/v2/mongo/options"
	"go.mongodb.org/mongo-driver/v2/x/mongo/driver/connstring"
)

var Client *mongo.Client
var Database *mongo.Database

// Connect resolves the database name from the URI path (e.g.
// mongodb://host:27017/vantage), falling back to fallbackDB when the URI names
// none, so a bare URI still works without a separate MONGO_DB env var.
func Connect(uri, fallbackDB string) error {
	cs, err := connstring.ParseAndValidate(uri)
	if err != nil {
		return fmt.Errorf("parse MONGO_URI: %w", err)
	}
	dbName := cs.Database
	if dbName == "" {
		dbName = fallbackDB
	}

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	client, err := mongo.Connect(options.Client().ApplyURI(uri))
	if err != nil {
		return err
	}

	if err := client.Ping(ctx, nil); err != nil {
		return err
	}

	Client = client
	Database = client.Database(dbName)
	return nil
}

func Col(name string) *mongo.Collection {
	return Database.Collection(name)
}
