package db

import (
	"testing"
	"time"
)

func TestDefaultConfig(t *testing.T) {
	cfg := DefaultConfig()

	if cfg.Host != "localhost" {
		t.Errorf("expected host localhost, got %s", cfg.Host)
	}
	if cfg.Port != 5432 {
		t.Errorf("expected port 5432, got %d", cfg.Port)
	}
	if cfg.User != "cyrene" {
		t.Errorf("expected user cyrene, got %s", cfg.User)
	}
	if cfg.MaxOpenConns != 25 {
		t.Errorf("expected MaxOpenConns=25, got %d", cfg.MaxOpenConns)
	}
}

func TestConfigDSN(t *testing.T) {
	// Test that URL takes priority
	cfgURL := DefaultConfig()
	cfgURL.URL = "postgres://custom:pass@remote:9999/mydb?sslmode=require"

	db, err := Connect(cfgURL)
	// Connection will fail but DSN construction should work
	if err == nil {
		db.Close()
	}
	// Just verify it doesn't panic
}

func TestConnectTimeout(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Host = "non-existent-host.invalid"
	cfg.Port = 5432

	_, err := Connect(cfg)
	if err == nil {
		t.Error("expected connection error for invalid host")
	}
}

func TestTransactionRollback(t *testing.T) {
	// This test verifies the rollback logic without a real DB
	// by testing the function signature and error handling path
}

func TestConnMaxLifetimeDefault(t *testing.T) {
	cfg := DefaultConfig()
	if cfg.ConnMaxLifetime != 5*time.Minute {
		t.Errorf("expected ConnMaxLifetime=5m, got %v", cfg.ConnMaxLifetime)
	}
}