#!/usr/bin/env python

import os
import sys
import argh
from argh import arg
import re
import ConfigParser
import json as JSON

VERSION = 0.1
defaults = {}
_boards = []
_outlets = []


def version():
    'show program version and quit'
    return 'OpenPDU version %s - Copyright (C) 2018 by Paolo Asperti.' % VERSION

@arg('-j', '--json', help="output in json")
def boards(json=False):
    'dump boards configuration'
    if json:
        b = [board.toJSON() for board in _boards]
        return JSON.dumps({'boards':b})
    else:
        b = ''
        for board in _boards:
            b += board.toSTR()
        return '\nBoards:\n' + b

@arg('-j', '--json', help="output in json")
def outlets(json=False):
    'dump outlets configuration'
    if json:
        o = [outlet.toJSON() for outlet in _outlets]
        return JSON.dumps({'outlets':o})
    else:
        o = ''
        if len(_outlets)>0:
            for outlet in _outlets:
                o += outlet.toSTR()
        return '\nOutlets:\n' + o


@arg("outlet", help="outlet number")
@arg("onoff", help="1=on [everything else]=off")
@arg('-j', '--json', help="output in json")
def setpower(outlet, onoff, json=False):
    'enable or disable power to an outlet'
    o = [o for o in _outlets if o.outletnum==int(outlet)]
    if len(o) != 1:
        print 'wrong outlet number: %s' % str(outlet)
        sys.exit(1)
    theOutlet = o[0]
    status = (onoff == '1')
    return theOutlet.setpower(status)


@arg("outlet", help="outlet number")
@arg('-j', '--json', help="output in json")
def getpower(outlet, json=False):
    'get outlet power status'
    o = [o for o in _outlets if o.outletnum==int(outlet)]
    if len(o) != 1:
        print 'wrong outlet number: %s' % str(outlet)
        sys.exit(1)
    theOutlet = o[0]
    return theOutlet.getpower()











class BoardI2COut(object):
    def __init__(self, boardnum, channels=None, address=None):
        self.boardnum = boardnum
        if channels is None:
            self.channels = 0
        else:
            self.channels = channels
        if address is None:
            self.address = 0x20
        else:
            self.address = address

    def toJSON(self):
        return {'boardnum':self.boardnum,'type':'i2c-out','channels':self.channels,'address':self.address}

    def toSTR(self):
        return ' Board %s\n Type: i2c-out\n Channels: %s\n Address: %s\n\n' % (self.boardnum,self.channels,self.address)

    def setpower(self, channel, power):
        return

    def getpower(self, channel):
        return False


class BoardGpioOut(object):
    gpios = []

    def __init__(self, boardnum, channels=None, gpios=None):
        self.boardnum = boardnum
        if channels is None:
            self.channels = 0
        else:
            self.channels = int(channels)
        if not isinstance(gpios, list):
            print 'No gpios specified for gpio board %s' % self.boardnum
        if len(gpios) != self.channels:
            print 'Wrong number of gpios specified for gpio board %s' % self.boardnum
        self.gpios = [int(gpio) for gpio in gpios]

    def toJSON(self):
      return {'boardnum':self.boardnum,'type':'gpio-out','channels':self.channels}

    def toSTR(self):
      return ' Board %s\n Type: gpio-out\n Channels: %s\n\n' % (self.boardnum,self.channels)

    def setpower(self, channel, power):
        io = self.gpios[channel]
        fn = '/sys/class/gpio/gpio%s/value' % io
        f = open(fn,'w')
        out = '0' if power else '1'
        return f.write(out)

    def getpower(self, channel):
        io = self.gpios[channel]
        fn = '/sys/class/gpio/gpio%s/value' % io
        f = open(fn,'r')
        return int(f.read()) == 0


class Outlet(object):
    def __init__(self, outletnum, boardnum, channel):
        self.outletnum = int(outletnum)
        b = [b for b in _boards if b.boardnum==int(boardnum)]
        self.board = b[0]
        self.channel = int(channel)
        self.description = 'Outlet # %s' % self.outletnum

    def setpower(self, power):
        return self.board.setpower(self.channel,power)

    def getpower(self):
        return self.board.getpower(self.channel)

    def toSTR(self):
      status = self.board.getpower(self.channel)
      return ' Outlet %s\n Description: %s\n Board #: %s\n Channel: %s\n Power Status:%s\n\n' % (self.outletnum,self.description,self.board.boardnum,self.channel,status)

    def toJSON(self):
      status = self.board.getpower(self.channel)
      return {'outlet':self.outletnum,'description':self.description,'board':self.board.boardnum,'channel':self.channel,'powerstatus':status}











configParser = ConfigParser.SafeConfigParser(defaults=defaults)

configFile = '/etc/openpdu/openpdu.conf'
if os.path.isfile(configFile) and os.access(configFile, os.R_OK):
  configParser.read(configFile)

for s in configParser.sections():
    if re.match('^board.*',s):
        bType = configParser.get(s, 'type')
        num = int(re.sub(r'^board','',s))
        if bType=='gpio-out':
            channels = int(configParser.get(s, 'channels'))
            gpios = []
            for g in range(0,channels):
                gpios.append(int(configParser.get(s, 'channel%s' % g)))
            b = BoardGpioOut(boardnum=num, channels=channels, gpios=gpios)
            _boards.append(b)
        elif bType=='i2c-out':
            channels = int(configParser.get(s, 'channels'))
            address = configParser.get(s, 'address')
            b = BoardI2COut(boardnum=num, channels=channels, address=address)
            _boards.append(b)
    if re.match('^outlet.*',s):
        num = int(re.sub(r'^outlet','',s))
        description = configParser.get(s, 'description')
        boardnum = configParser.get(s, 'board')
        channel = configParser.get(s, 'channel')
        o = Outlet(outletnum=num, boardnum=boardnum, channel=channel)
        o.description = description
        _outlets.append(o)

parser = argh.ArghParser()
parser.add_commands([setpower, getpower, outlets, boards, version])

# dispatching:

if __name__ == '__main__':
    parser.dispatch()