package pgdb

import (
	"testing"
	"time"

	"go.ntppool.org/common/database"
)

func TestCreatePoolConfig(t *testing.T) {
	tests := []struct {
		name    string
		cfg     *database.PostgresConfig
		wantErr bool
	}{
		{
			name: "valid config",
			cfg: &database.PostgresConfig{
				Host:    "localhost",
				Port:    5432,
				User:    "testuser",
				Pass:    "testpass",
				Name:    "testdb",
				SSLMode: "require",
			},
			wantErr: false,
		},
		{
			name: "valid config with defaults",
			cfg: &database.PostgresConfig{
				Host: "localhost",
				User: "testuser",
				Pass: "testpass",
				Name: "testdb",
				// Port and SSLMode will use defaults
			},
			wantErr: false,
		},
		{
			name: "missing host",
			cfg: &database.PostgresConfig{
				User: "testuser",
				Pass: "testpass",
				Name: "testdb",
			},
			wantErr: true,
		},
		{
			name: "missing user",
			cfg: &database.PostgresConfig{
				Host: "localhost",
				Pass: "testpass",
				Name: "testdb",
			},
			wantErr: true,
		},
		{
			name: "missing database name",
			cfg: &database.PostgresConfig{
				Host: "localhost",
				User: "testuser",
				Pass: "testpass",
			},
			wantErr: true,
		},
		{
			name: "invalid sslmode",
			cfg: &database.PostgresConfig{
				Host:    "localhost",
				User:    "testuser",
				Pass:    "testpass",
				Name:    "testdb",
				SSLMode: "invalid",
			},
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			poolCfg, err := CreatePoolConfig(tt.cfg)
			if (err != nil) != tt.wantErr {
				t.Errorf("CreatePoolConfig() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !tt.wantErr && poolCfg == nil {
				t.Error("CreatePoolConfig() returned nil config without error")
			}
			if !tt.wantErr && poolCfg != nil {
				// Verify config fields are set correctly
				if poolCfg.ConnConfig.Host != tt.cfg.Host && tt.cfg.Host != "" {
					t.Errorf("Expected Host=%s, got %s", tt.cfg.Host, poolCfg.ConnConfig.Host)
				}
				if poolCfg.ConnConfig.User != tt.cfg.User {
					t.Errorf("Expected User=%s, got %s", tt.cfg.User, poolCfg.ConnConfig.User)
				}
				if poolCfg.ConnConfig.Password != tt.cfg.Pass {
					t.Errorf("Expected Password to be set correctly")
				}
				if poolCfg.ConnConfig.Database != tt.cfg.Name {
					t.Errorf("Expected Database=%s, got %s", tt.cfg.Name, poolCfg.ConnConfig.Database)
				}
			}
		})
	}
}

func TestDefaultPoolOptions(t *testing.T) {
	opts := DefaultPoolOptions()

	// Verify expected defaults
	if opts.MinConns != 0 {
		t.Errorf("Expected MinConns=0, got %d", opts.MinConns)
	}
	if opts.MaxConns != 25 {
		t.Errorf("Expected MaxConns=25, got %d", opts.MaxConns)
	}
	if opts.MaxConnLifetime != time.Hour {
		t.Errorf("Expected MaxConnLifetime=1h, got %v", opts.MaxConnLifetime)
	}
	if opts.MaxConnIdleTime != 30*time.Minute {
		t.Errorf("Expected MaxConnIdleTime=30m, got %v", opts.MaxConnIdleTime)
	}
	if opts.HealthCheckPeriod != time.Minute {
		t.Errorf("Expected HealthCheckPeriod=1m, got %v", opts.HealthCheckPeriod)
	}
	if len(opts.ConfigFiles) == 0 {
		t.Error("Expected ConfigFiles to be non-empty")
	}
}

func TestCreatePoolConfigDefaults(t *testing.T) {
	// Test that defaults are applied correctly
	cfg := &database.PostgresConfig{
		Host: "localhost",
		User: "testuser",
		Pass: "testpass",
		Name: "testdb",
		// Port and SSLMode not set
	}

	poolCfg, err := CreatePoolConfig(cfg)
	if err != nil {
		t.Fatalf("CreatePoolConfig() failed: %v", err)
	}

	// Verify defaults were applied
	if poolCfg.ConnConfig.Port != 5432 {
		t.Errorf("Expected default Port=5432, got %d", poolCfg.ConnConfig.Port)
	}
}