config

type APIConfig struct {
	Host string `env:"HOST" env-default:"0.0.0.0"`
	Port int    `env:"PORT" env-default:"8080"`
}

type AppConfig struct {
	Name        string `env:"NAME" env-default:"my-app"`
	Version     string `env:"VERSION" env-default:"0.1.0"`
	Environment string `env:"ENVIRONMENT" env-default:"development"`
}

type Config struct {
	App       AppConfig       `env-prefix:"APP_"`
	API       APIConfig       `env-prefix:"API_"`
	Metrics   MetricsConfig   `env-prefix:"METRICS_"`
	Logging   LoggingConfig   `env-prefix:"LOGGING_"`
	Telemetry TelemetryConfig `env-prefix:"TELEMETRY_"`
	Sentry    SentryConfig    `env-prefix:"SENTRY_"`
	Debug     bool            `env:"DEBUG" env-default:"false"`

	Postgres PostgresConfig `env-prefix:"POSTGRES_"`
}

type LoggingConfig struct {
	Level     string `env:"LEVEL" env-default:"info"`
	AddCaller bool   `env:"ADD_CALLER" env-default:"false"`
}

type MetricsConfig struct {
	Enabled bool   `env:"ENABLED" env-default:"true"`
	Host    string `env:"HOST" env-default:"0.0.0.0"`
	Port    int    `env:"PORT" env-default:"8081"`
	Path    string `env:"PATH" env-default:"/metrics"`
}

type PostgresConfig struct {
	DSN SecretStr `env:"DSN" env-default:""`

	// Hosts is a comma-separated list of host:port pars:
	//
	// Example: "localhost:15432,localhost:15433"
	//
	// If empty then ConnString() uses Postgres default: "localhost:5432"
	Hosts    []string  `env:"HOSTS" env-default:""`
	User     string    `env:"USER" env-default:"postgres"`
	Password SecretStr `env:"PASSWORD" env-default:"postgres"`
	Database string    `env:"DATABASE" env-default:"postgres"`
	// SSLMode
	//
	// Values:
	//   - "disable" - only try a non-SSL connection
	//   - "allow" - first try a non-SSL connection; if that fails, try an SSL connection
	//   - "prefer" - first try an SSL connection; if that fails, try a non-SSL connection
	//   - "require" - only try an SSL connection. If a root CA file is present, verify the certificate in the same way as if verify-ca was specified
	//   - "verify-ca" - only try an SSL connection, and verify that the server certificate is issued by a trusted certificate authority (CA)
	//   - "verify-full" - only try an SSL connection, verify that the server certificate is issued by a trusted CA and that the requested server host name matches that in the certificate
	SSLMode string `env:"SSLMODE" env-default:"prefer"`
	// TargetSessionAttrs used to specify the required state of a server before a connection is established.
	//
	// Useful values:
	//   - "primary" - server must not be in hot standby mode (master)
	//   - "standby" - server must be in hot standby mode (replica)
	//   - "prefer-standby" - first try to find a standby server, but if none of the listed hosts is a standby server, try again in any mode
	//
	// https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNECT-TARGET-SESSION-ATTRS
	TargetSessionAttrs string `env:"TARGET_SESSION_ATTRS" env-default:"primary"`

	MaxConns          int32         `env:"MAX_CONNS" env-default:"10"`
	MinConns          int32         `env:"MIN_CONNS" env-default:"0"`
	MaxConnLifetime   time.Duration `env:"MAX_CONN_LIFETIME" env-default:"1h"`
	MaxConnIdleTime   time.Duration `env:"MAX_CONN_IDLE_TIME" env-default:"30m"`
	HealthCheckPeriod time.Duration `env:"HEALTH_CHECK_PERIOD" env-default:"1m"`

	PingTimeout    time.Duration `env:"PING_TIMEOUT" env-default:"30s"`
	ConnectTimeout time.Duration `env:"CONNECT_TIMEOUT" env-default:"30s"`

	PoolName           string        `env:"POOL_NAME" env-default:""`
	SlowQueryThreshold time.Duration `env:"SLOW_QUERY_THRESHOLD" env-default:"0"`
}

type SecretStr string

type SecretURL string

type SentryConfig struct {
	DSN          SecretURL     `env:"DSN" env-default:""`
	Levels       []string      `env:"LEVELS" env-default:"warn,error"`
	SampleRate   float64       `env:"SAMPLE_RATE" env-default:"1.0"`
	FlushTimeout time.Duration `env:"FLUSH_TIMEOUT" env-default:"5s"`
	// EnableTracing enables OpenTelemetry tracing via Sentry's OTLP exporter.
	// Requires TelemetryConfig.Enabled=true and InitTelemetry called before InitSentry.
	// TracingEndpoint may be empty — traces will be sent to Sentry only.
	EnableTracing bool `env:"ENABLE_TRACING" env-default:"false"`
	// Debug Sentry SDK
	Debug bool `env:"DEBUG" env-default:"false"`
}

type TelemetryConfig struct {
	Enabled         bool          `env:"ENABLED" env-default:"false"`
	TracingEndpoint string        `env:"TRACING_ENDPOINT" env-default:"localhost:4317"`
	SampleRate      float64       `env:"SAMPLE_RATE" env-default:"1.0"`
	UseTLS          bool          `env:"USE_TLS" env-default:"false"`
	SkipVerifyCA    bool          `env:"SKIP_VERIFY_CA" env-default:"false"`
	CACertPath      string        `env:"CA_CERT_PATH" env-default:""`
	ConnectTimeout  time.Duration `env:"CONNECT_TIMEOUT" env-default:"10s"`
}