// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.

package protocol

import (
	"io"
	"sync/atomic"
	"time"
)

type countingReader struct {
	io.Reader
	tot  uint64 // bytes
	last int64  // unix nanos
}

var (
	totalIncoming uint64
	totalOutgoing uint64
)

func (c *countingReader) Read(bs []byte) (int, error) {
	n, err := c.Reader.Read(bs)
	atomic.AddUint64(&c.tot, uint64(n))
	atomic.AddUint64(&totalIncoming, uint64(n))
	atomic.StoreInt64(&c.last, time.Now().UnixNano())
	return n, err
}

func (c *countingReader) Tot() uint64 {
	return atomic.LoadUint64(&c.tot)
}

func (c *countingReader) Last() time.Time {
	return time.Unix(0, atomic.LoadInt64(&c.last))
}

type countingWriter struct {
	io.Writer
	tot  uint64 // bytes
	last int64  // unix nanos
}

func (c *countingWriter) Write(bs []byte) (int, error) {
	n, err := c.Writer.Write(bs)
	atomic.AddUint64(&c.tot, uint64(n))
	atomic.AddUint64(&totalOutgoing, uint64(n))
	atomic.StoreInt64(&c.last, time.Now().UnixNano())
	return n, err
}

func (c *countingWriter) Tot() uint64 {
	return atomic.LoadUint64(&c.tot)
}

func (c *countingWriter) Last() time.Time {
	return time.Unix(0, atomic.LoadInt64(&c.last))
}

func TotalInOut() (uint64, uint64) {
	return atomic.LoadUint64(&totalIncoming), atomic.LoadUint64(&totalOutgoing)
}