package database

import (
	"context"
	"fmt"
	"log"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"

	"5803025050/internal/config"
)

// ConnectDB establishes a connection pool to the PostgreSQL database
// using the configuration values from Config.
func ConnectDB(cfg *config.Config) (*pgxpool.Pool, error) {
	dsn := cfg.DatabaseURL()

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

	poolConfig, err := pgxpool.ParseConfig(dsn)
	if err != nil {
		return nil, fmt.Errorf("unable to parse database config: %w", err)
	}

	pool, err := pgxpool.NewWithConfig(ctx, poolConfig)
	if err != nil {
		return nil, fmt.Errorf("unable to create connection pool: %w", err)
	}

	if err := pool.Ping(ctx); err != nil {
		pool.Close()
		return nil, fmt.Errorf("unable to ping database: %w", err)
	}

	log.Println("database connection established")
	return pool, nil
}

// CloseDB gracefully closes the database connection pool.
func CloseDB(pool *pgxpool.Pool) {
	if pool != nil {
		pool.Close()
		log.Println("database connection closed")
	}
}