/*
uploader -- simplest form file uploader
Copyright (C) 2018-2021 Sergey Matveev <stargrave@stargrave.org>

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, version 3 of the License.

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 main

import (
	"net"
	"net/http"
	"os"
	"time"
)

type UCSPIAddr struct {
	ip   string
	port string
}

func (addr *UCSPIAddr) Network() string { return "tcp" }

func (addr *UCSPIAddr) String() string { return addr.ip + ":" + addr.port }

type UCSPIConn struct{}

func (conn *UCSPIConn) Read(b []byte) (int, error) { return os.Stdin.Read(b) }

func (conn *UCSPIConn) Write(b []byte) (int, error) { return os.Stdout.Write(b) }

func (conn *UCSPIConn) Close() error {
	if err := os.Stdin.Close(); err != nil {
		return err
	}
	return os.Stdin.Close()
}

func (conn *UCSPIConn) LocalAddr() net.Addr {
	return &UCSPIAddr{ip: os.Getenv("TCPLOCALIP"), port: os.Getenv("TCPLOCALPORT")}
}

func (conn *UCSPIConn) RemoteAddr() net.Addr {
	return &UCSPIAddr{ip: os.Getenv("TCPREMOTEIP"), port: os.Getenv("TCPREMOTEPORT")}
}

func (conn *UCSPIConn) SetDeadline(t time.Time) error {
	if err := os.Stdin.SetReadDeadline(t); err != nil {
		return err
	}
	return os.Stdout.SetWriteDeadline(t)
}

func (conn *UCSPIConn) SetReadDeadline(t time.Time) error {
	return os.Stdin.SetReadDeadline(t)
}

func (conn *UCSPIConn) SetWriteDeadline(t time.Time) error {
	return os.Stdout.SetWriteDeadline(t)
}

type UCSPI struct{ accepted bool }

type UCSPIAlreadyAccepted struct{}

func (u UCSPIAlreadyAccepted) Error() string {
	return "already accepted"
}

func (ucspi *UCSPI) Accept() (net.Conn, error) {
	if ucspi.accepted {
		return nil, UCSPIAlreadyAccepted{}
	}
	ucspi.accepted = true
	return &UCSPIConn{}, nil
}

func (ucspi *UCSPI) Close() error {
	return nil
}

func (ucspi *UCSPI) Addr() net.Addr {
	return &UCSPIAddr{ip: os.Getenv("TCPLOCALIP"), port: os.Getenv("TCPLOCALPORT")}
}

func connStater(conn net.Conn, connState http.ConnState) {
	switch connState {
	case http.StateNew:
		Jobs.Add(1)
	case http.StateClosed:
		Jobs.Done()
	}
}