package lang

import (
	"testing"
)

func TestServerWithEnvironmentVariables(t *testing.T) {
	input := `
server MyApp {
    host env "HOST" default "localhost"
    port env "PORT" default "8080"
    database_url env "DATABASE_URL" required
    api_key env "API_SECRET_KEY" required
}
`

	ast, err := ParseInput(input)
	if err != nil {
		t.Fatalf("Parse error: %v", err)
	}

	if len(ast.Definitions) != 1 {
		t.Fatalf("Expected 1 definition, got %d", len(ast.Definitions))
	}

	server := ast.Definitions[0].Server
	if server == nil {
		t.Fatalf("Expected server definition")
	}

	if server.Name != "MyApp" {
		t.Errorf("Expected server name 'MyApp', got '%s'", server.Name)
	}

	if len(server.Settings) != 4 {
		t.Fatalf("Expected 4 settings, got %d", len(server.Settings))
	}

	// Test host setting
	hostSetting := server.Settings[0]
	if hostSetting.Host == nil {
		t.Fatalf("Expected host setting")
	}
	if hostSetting.Host.EnvVar == nil {
		t.Fatalf("Expected host to be environment variable")
	}
	if hostSetting.Host.EnvVar.Name != "HOST" {
		t.Errorf("Expected env var name 'HOST', got '%s'", hostSetting.Host.EnvVar.Name)
	}
	if hostSetting.Host.EnvVar.Default == nil || *hostSetting.Host.EnvVar.Default != "localhost" {
		t.Errorf("Expected default 'localhost'")
	}

	// Test port setting
	portSetting := server.Settings[1]
	if portSetting.Port == nil {
		t.Fatalf("Expected port setting")
	}
	if portSetting.Port.EnvVar == nil {
		t.Fatalf("Expected port to be environment variable")
	}
	if portSetting.Port.EnvVar.Name != "PORT" {
		t.Errorf("Expected env var name 'PORT', got '%s'", portSetting.Port.EnvVar.Name)
	}
	if portSetting.Port.EnvVar.Default == nil || *portSetting.Port.EnvVar.Default != "8080" {
		t.Errorf("Expected default '8080'")
	}

	// Test required database_url
	dbSetting := server.Settings[2]
	if dbSetting.DatabaseURL == nil {
		t.Fatalf("Expected database_url setting")
	}
	if dbSetting.DatabaseURL.EnvVar == nil {
		t.Fatalf("Expected database_url to be environment variable")
	}
	if !dbSetting.DatabaseURL.EnvVar.Required {
		t.Errorf("Expected database_url to be required")
	}

	// Test required api_key
	apiSetting := server.Settings[3]
	if apiSetting.APIKey == nil {
		t.Fatalf("Expected api_key setting")
	}
	if apiSetting.APIKey.EnvVar == nil {
		t.Fatalf("Expected api_key to be environment variable")
	}
	if !apiSetting.APIKey.EnvVar.Required {
		t.Errorf("Expected api_key to be required")
	}
}

func TestServerWithMixedValues(t *testing.T) {
	input := `
server MyApp {
    host "localhost"
    port env "PORT" default "8080"
    database_url env "DATABASE_URL" required
}
`

	ast, err := ParseInput(input)
	if err != nil {
		t.Fatalf("Parse error: %v", err)
	}

	server := ast.Definitions[0].Server
	if server == nil {
		t.Fatalf("Expected server definition")
	}

	// Test literal host
	hostSetting := server.Settings[0]
	if hostSetting.Host == nil {
		t.Fatalf("Expected host setting")
	}
	if hostSetting.Host.Literal == nil {
		t.Fatalf("Expected host to be literal value")
	}
	if *hostSetting.Host.Literal != "localhost" {
		t.Errorf("Expected literal value 'localhost', got '%s'", *hostSetting.Host.Literal)
	}

	// Test env port
	portSetting := server.Settings[1]
	if portSetting.Port == nil {
		t.Fatalf("Expected port setting")
	}
	if portSetting.Port.EnvVar == nil {
		t.Fatalf("Expected port to be environment variable")
	}
}

func TestServerWithLiteralPort(t *testing.T) {
	input := `
server MyApp {
    host "localhost"
    port 8080
}
`

	ast, err := ParseInput(input)
	if err != nil {
		t.Fatalf("Parse error: %v", err)
	}

	server := ast.Definitions[0].Server
	portSetting := server.Settings[1]
	if portSetting.Port == nil {
		t.Fatalf("Expected port setting")
	}
	if portSetting.Port.Literal == nil {
		t.Fatalf("Expected port to be literal value")
	}
	if *portSetting.Port.Literal != 8080 {
		t.Errorf("Expected literal port 8080, got %d", *portSetting.Port.Literal)
	}
}

func TestServerConfigurationsInAnyOrder(t *testing.T) {
	// Test that server settings can be defined in any order
	tests := []struct {
		name  string
		input string
	}{
		{
			name: "host first, then port",
			input: `
server MyApp {
    host "localhost"
    port 8080
}`,
		},
		{
			name: "port first, then host",
			input: `
server MyApp {
    port 8080
    host "localhost"
}`,
		},
		{
			name: "mixed literal and env vars in random order",
			input: `
server MyApp {
    api_key env "API_KEY" required
    host "localhost"
    database_url env "DATABASE_URL" default "postgres://localhost:5432/myapp"
    port 8080
    ssl_cert env "SSL_CERT" required
}`,
		},
		{
			name: "all env vars in different order",
			input: `
server MyApp {
    ssl_key env "SSL_KEY" required
    port env "PORT" default "8080"
    database_url env "DATABASE_URL" required
    host env "HOST" default "localhost"
    api_key env "API_KEY" required
    ssl_cert env "SSL_CERT" required
}`,
		},
		{
			name: "all literal values in different order",
			input: `
server MyApp {
    database_url "postgres://localhost:5432/myapp"
    port 3000
    ssl_key "/path/to/ssl.key"
    host "0.0.0.0"
    api_key "secret123"
    ssl_cert "/path/to/ssl.crt"
}`,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ast, err := ParseInput(tt.input)
			if err != nil {
				t.Fatalf("Parse error for %s: %v", tt.name, err)
			}

			if len(ast.Definitions) != 1 {
				t.Fatalf("Expected 1 definition, got %d", len(ast.Definitions))
			}

			server := ast.Definitions[0].Server
			if server == nil {
				t.Fatalf("Expected server definition")
			}

			if server.Name != "MyApp" {
				t.Errorf("Expected server name 'MyApp', got '%s'", server.Name)
			}

			// Verify that we can parse any number of settings in any order
			if len(server.Settings) < 1 {
				t.Fatalf("Expected at least 1 setting, got %d", len(server.Settings))
			}

			// Test that we can access specific settings regardless of order
			var hasHost, hasPort bool
			for _, setting := range server.Settings {
				if setting.Host != nil {
					hasHost = true
				}
				if setting.Port != nil {
					hasPort = true
				}
			}

			// For the first two tests, verify both host and port are present
			if tt.name == "host first, then port" || tt.name == "port first, then host" {
				if !hasHost {
					t.Errorf("Expected to find host setting")
				}
				if !hasPort {
					t.Errorf("Expected to find port setting")
				}
			}

			t.Logf("Successfully parsed %d settings for test '%s'", len(server.Settings), tt.name)
		})
	}
}

func TestServerConfigurationValidation(t *testing.T) {
	// Test that we can properly validate different configurations
	input := `
server ProductionApp {
    ssl_cert env "SSL_CERT_PATH" required
    database_url env "DATABASE_URL" required
    host env "HOST" default "0.0.0.0"
    api_key env "SECRET_API_KEY" required
    port env "PORT" default "443"
    ssl_key env "SSL_KEY_PATH" required
}
`

	ast, err := ParseInput(input)
	if err != nil {
		t.Fatalf("Parse error: %v", err)
	}

	server := ast.Definitions[0].Server
	if server.Name != "ProductionApp" {
		t.Errorf("Expected server name 'ProductionApp', got '%s'", server.Name)
	}

	// Create a map to easily check for specific settings
	settingsMap := make(map[string]interface{})
	for _, setting := range server.Settings {
		if setting.Host != nil {
			settingsMap["host"] = setting.Host
		}
		if setting.Port != nil {
			settingsMap["port"] = setting.Port
		}
		if setting.DatabaseURL != nil {
			settingsMap["database_url"] = setting.DatabaseURL
		}
		if setting.APIKey != nil {
			settingsMap["api_key"] = setting.APIKey
		}
		if setting.SSLCert != nil {
			settingsMap["ssl_cert"] = setting.SSLCert
		}
		if setting.SSLKey != nil {
			settingsMap["ssl_key"] = setting.SSLKey
		}
	}

	// Verify all expected settings are present
	expectedSettings := []string{"host", "port", "database_url", "api_key", "ssl_cert", "ssl_key"}
	for _, expected := range expectedSettings {
		if _, exists := settingsMap[expected]; !exists {
			t.Errorf("Expected to find setting '%s'", expected)
		}
	}

	// Verify host has default value
	if hostSetting, ok := settingsMap["host"].(*ConfigValue); ok {
		if hostSetting.EnvVar == nil {
			t.Errorf("Expected host to be environment variable")
		} else if hostSetting.EnvVar.Default == nil || *hostSetting.EnvVar.Default != "0.0.0.0" {
			t.Errorf("Expected host default to be '0.0.0.0'")
		}
	}

	// Verify ssl_cert is required
	if sslCertSetting, ok := settingsMap["ssl_cert"].(*ConfigValue); ok {
		if sslCertSetting.EnvVar == nil {
			t.Errorf("Expected ssl_cert to be environment variable")
		} else if !sslCertSetting.EnvVar.Required {
			t.Errorf("Expected ssl_cert to be required")
		}
	}
}