'''
Some basic examples of using Espec North Americas Web Controller RESTful API.

These examples require firmware version at least version 2.3.
'''
import requests, json, time

def parse(rsp):
    if rsp.status_code < 200 or rsp.status_code >= 300:
        print 'ERROR code: {0}, Exception: "{exception}", message: "{message}"'.format(rsp.status_code, **rsp.json())
        print 'The script will stop due to an error.'
        exit(1)
    try:
        return rsp.json()
    except Exception:
        # Response was not json return the raw text
        return rsp.text

def pprint(data):
    print(json.dumps(data, sort_keys=True, indent=4))

host = 'http://wc.espec.com'
headers = {'Content-type': 'application/json'}



print 'Get current chamber state as one request:'
rsp = parse(requests.get(host + '/api/edge/chambers/1'))
print '\tCurrent Chamber Mode: {mode}'.format(**rsp['operations'])

# The front end application (HTML/javascript/knockout.js) is just a large template that this api
# information bound to. By having this data in a list/array we can have as many structures
# as are needed for the chamber; while this does make things more complex it means
# for large custom projects NO custom software is needed.
template = u'\t{name} setpoint:{setValue[current]}{units}, processValue:{processValue[air]}{units}'
for loop in rsp['loops']:
    print template.format(**loop)



print 'Get curent chamber state as multiple requests:'
rsp = parse(requests.get(host + '/api/edge/chambers/1/operations/mode'))['data']
print '\tCurrent Chamber Mode: {}'.format(rsp)

# This example shows how not using the list/array requires more logic specific to the application.
# Meaning this section only works for a temperature/humidity chamber the other example above
# Works for ANY chamber.
for loop in ['Temperature', 'Humidity']:
    url = '{}/api/edge/chambers/1/loops/{}/{}'
    setval = parse(requests.get(url.format(host, loop, 'setValue/current')))['data']
    unit = parse(requests.get(url.format(host, loop, 'units')))['data']
    proc = parse(requests.get(url.format(host, loop, 'processValue/air')))['data']
    print u'\t{0} setpoint: {1}{2}, processValue:{3}{2}'.format(loop, setval, unit, proc)



print 'Run constant mode at 75/85'
# These two lines do exactly the same thing as the next two, some people find the next two more clear.
data = [{'name':'Temperature', 'setValue':75.0}, {'name': 'Humidity', 'setValue':85.0}]
parse(requests.post(host + '/api/edge/chambers/1/loops', data=json.dumps(data), headers=headers))
parse(requests.post(host + '/api/edge/chambers/1/loops/Temperature/setValue', data=json.dumps(75), headers=headers))
parse(requests.post(host + '/api/edge/chambers/1/loops/Humidity/setValue', data=json.dumps(85), headers=headers))

#start constant mode
parse(requests.post(host + '/api/edge/chambers/1/operations/constant'))



print 'wait 10 seconds, then stop chamber.'
time.sleep(10)
parse(requests.post(host + '/api/edge/chambers/1/operations/standby'))



print 'wait 10 seconds, then start the first available program; and print that program'
time.sleep(10)
programs = parse(requests.get(host + '/api/edge/chambers/1/programs'))['programs']
for i, program in enumerate(programs):
    if not program['empty']:
        parse(requests.post('{}/api/edge/chambers/1/operations/program/{}'.format(host, program['number'])))
        print pprint(parse(requests.get(program['uri'])))
        break
    if len(programs) - 1 == i:
        print 'No program to run'