package metrics

import "sync/atomic"

// Metrics 指标接口
type Metrics interface {
	// IncConnections 增加连接数
	IncConnections()

	// DecConnections 减少连接数
	DecConnections()

	// GetConnections 获取当前连接数
	GetConnections() int64

	// IncRequests 增加请求数
	IncRequests()

	// GetRequests 获取请求总数
	GetRequests() int64

	// IncErrors 增加错误数
	IncErrors()

	// GetErrors 获取错误总数
	GetErrors() int64

	// AddBytesReceived 增加接收字节数
	AddBytesReceived(bytes int64)

	// GetBytesReceived 获取接收字节总数
	GetBytesReceived() int64

	// AddBytesSent 增加发送字节数
	AddBytesSent(bytes int64)

	// GetBytesSent 获取发送字节总数
	GetBytesSent() int64
}

// metrics 指标实现
type metrics struct {
	connections   int64
	requests      int64
	errors        int64
	bytesReceived int64
	bytesSent     int64
}

// NewMetrics 创建指标实例
func NewMetrics() Metrics {
	return &metrics{}
}

// IncConnections 增加连接数
func (m *metrics) IncConnections() {
	atomic.AddInt64(&m.connections, 1)
}

// DecConnections 减少连接数
func (m *metrics) DecConnections() {
	atomic.AddInt64(&m.connections, -1)
}

// GetConnections 获取当前连接数
func (m *metrics) GetConnections() int64 {
	return atomic.LoadInt64(&m.connections)
}

// IncRequests 增加请求数
func (m *metrics) IncRequests() {
	atomic.AddInt64(&m.requests, 1)
}

// GetRequests 获取请求总数
func (m *metrics) GetRequests() int64 {
	return atomic.LoadInt64(&m.requests)
}

// IncErrors 增加错误数
func (m *metrics) IncErrors() {
	atomic.AddInt64(&m.errors, 1)
}

// GetErrors 获取错误总数
func (m *metrics) GetErrors() int64 {
	return atomic.LoadInt64(&m.errors)
}

// AddBytesReceived 增加接收字节数
func (m *metrics) AddBytesReceived(bytes int64) {
	atomic.AddInt64(&m.bytesReceived, bytes)
}

// GetBytesReceived 获取接收字节总数
func (m *metrics) GetBytesReceived() int64 {
	return atomic.LoadInt64(&m.bytesReceived)
}

// AddBytesSent 增加发送字节数
func (m *metrics) AddBytesSent(bytes int64) {
	atomic.AddInt64(&m.bytesSent, bytes)
}

// GetBytesSent 获取发送字节总数
func (m *metrics) GetBytesSent() int64 {
	return atomic.LoadInt64(&m.bytesSent)
}