// Copyright 2011 - 2012 Xing Xing <mikespook@gmail.com>.
// All rights reserved.
// Use of this source code is governed by a MIT
// license that can be found in the LICENSE file.

package common

import (
    "bytes"
    "encoding/binary"
)

const (
    NETWORK = "tcp"
    // queue size
    QUEUE_SIZE = 8
    // read buffer size
    BUFFER_SIZE = 1024

    // \x00REQ
    REQ     = 5391697
    REQ_STR = "\x00REQ"
    // \x00RES
    RES     = 5391699
    RES_STR = "\x00RES"

    // package data type
    CAN_DO          = 1
    CANT_DO         = 2
    RESET_ABILITIES = 3
    PRE_SLEEP       = 4
    NOOP            = 6
    JOB_CREATED     = 8
    GRAB_JOB        = 9
    NO_JOB          = 10
    JOB_ASSIGN      = 11
    WORK_STATUS     = 12
    WORK_COMPLETE   = 13
    WORK_FAIL       = 14
    GET_STATUS      = 15
    ECHO_REQ        = 16
    ECHO_RES        = 17
    ERROR           = 19
    STATUS_RES      = 20
    SET_CLIENT_ID   = 22
    CAN_DO_TIMEOUT  = 23
    WORK_EXCEPTION  = 25
    WORK_DATA       = 28
    WORK_WARNING    = 29
    GRAB_JOB_UNIQ   = 30
    JOB_ASSIGN_UNIQ = 31

    SUBMIT_JOB         = 7
    SUBMIT_JOB_BG      = 18
    SUBMIT_JOB_HIGH    = 21
    SUBMIT_JOB_HIGH_BG = 32
    SUBMIT_JOB_LOW     = 33
    SUBMIT_JOB_LOW_BG  = 34
)

// Decode [4]byte to uint32 
func BytesToUint32(buf [4]byte) uint32 {
    var r uint32
    b := bytes.NewBuffer(buf[:])
    err := binary.Read(b, binary.BigEndian, &r)
    if err != nil {
        return 0
    }
    return r
}

// Encode uint32 to [4]byte
func Uint32ToBytes(i uint32) [4]byte {
    buf := new(bytes.Buffer)
    err := binary.Write(buf, binary.BigEndian, i)
    if err != nil {
        return [4]byte{0, 0, 0, 0}
    }
    var r [4]byte
    for k, v := range buf.Bytes() {
        r[k] = v
    }
    return r
}