from pycomm.ab_comm.clx import Driver as ClxDriver
import sys
from time import sleep
from readConfig import readConfig

def closeEnough(a,b):
    return abs(a - b) <= 0.1

configProperties = readConfig()

def readTag(addr, tag):
    time.sleep(0.01)
    c = ClxDriver()
    if c.open(configProperties['PLC_IP_ADDRESS']):
        out = {}
        try:
            result =  c.read_tag([tagName])
            if result[0][2] == None:
                raise ValueError('Tag not found')
            out['status'] = "success"
            out['value'] = result[0][1]
            out['type'] = result[0][2]
        except Exception, e:
            out['status'] = "error"
            out['message'] = "Tag Not Found"
        c.close()
        return out


def main(tag, value):
    global configProperties
    r = 0

    readObj = readTag(tag)
    if readObj['status'] == "error":
        return readObj
    elif readObj['status'] == 'success':
        tagType = readObj['type']

        if tagType[:-3] == "INT" or tagType == "BOOL":
            value = int(value)
        elif tagType == "REAL":
            value = float(value)
        c = ClxDriver()
        if c.open(configProperties['PLC_IP_ADDRESS']):
            r = c.write_tag(tag, value, tagType)
        else:
            return {"status": 'error', "message": "not connected to PLC"}
        c.close()

    sleep(2)

    return readTag(tag)

def writeTagAndVerify(tag,value, sleepValue=2):
    """Writes the specified value to tag and confirms that the value has been set"""
    global configProperties
    r = 0

    readObj = readTag(tag)
    if readObj['status'] == "error":
        return readObj
    elif readObj['status'] == 'success':
        tagType = readObj['type']
        prevValue = readObj['value']
        if tagType[:-3] == "INT" or tagType == "BOOL":
            value = int(value)
        elif tagType == "REAL":
            value = float(value)
        c = ClxDriver()
        if c.open(configProperties['PLC_IP_ADDRESS']):
            r = c.write_tag(tag, value, tagType)
            sleep(float(sleepValue))
            newObj = readTag(tag)
            if newObj['status'] == "error":
                return newObj
            elif newObj['status'] == 'success':
                newTagType = newObj['type']
                newValue = newObj['value']
                if (newTagType == tagType):
                    if (closeEnough(newValue, value)):
                        return {'status':'success', 'value':newValue, 'type':newTagType, 'verified':'true','prevValue':prevValue}
                    else:
                        return {"status": 'error', "message": "The tag value does not match the specified value", "value":newValue}
                else:
                    return {"status": 'error', "message": "Somehow the tag type has changed"}
        else:
            return {"status": 'error', "message": "not connected to PLC"}
        c.close()

def toggle(tag, toggleVal, timeToggled=2):
    val = int(toggleVal)
    set_tag = writeTagAndVerify(tag,toggleVal,sleepValue=1)
    if set_tag['status']== 'success':
        sleep(timeToggled)
        reset_tag = writeTagAndVerify(tag, set_tag['prevValue'],sleepValue=1)
        if reset_tag['status'] == "success":
            return {'status':'success'}
        else:
            return {'status':'error', 'message':reset_tag['message']}
    else:
        return {'status':'error', 'message':set_tag['message']}

if __name__ == '__main__':
    print main(sys.argv[1], sys.argv[2])