package storage

import (
	"context"
	"fmt"
	"log/slog"

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

	"github.com/denisovdennis/autohero/internal/config"
)

// NewPostgres creates a PostgreSQL connection pool.
func NewPostgres(ctx context.Context, cfg config.DBConfig, logger *slog.Logger) (*pgxpool.Pool, error) {
	poolCfg, err := pgxpool.ParseConfig(cfg.DSN())
	if err != nil {
		return nil, fmt.Errorf("parse postgres config: %w", err)
	}

	// Sensible pool defaults for a game server.
	poolCfg.MaxConns = 20
	poolCfg.MinConns = 5

	pool, err := pgxpool.NewWithConfig(ctx, poolCfg)
	if err != nil {
		return nil, fmt.Errorf("create postgres pool: %w", err)
	}

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

	logger.Info("connected to PostgreSQL",
		"host", cfg.Host,
		"port", cfg.Port,
		"database", cfg.Name,
	)

	return pool, nil
}