from couchpotato.core.helpers.request import getParams
from functools import wraps
from threading import Thread
from tornado.gen import coroutine
from tornado.web import RequestHandler, asynchronous
import json
import threading
import tornado
import urllib

api = {}
api_locks = {}
api_nonblock = {}

api_docs = {}
api_docs_missing = []

def run_async(func):
    @wraps(func)
    def async_func(*args, **kwargs):
        func_hl = Thread(target = func, args = args, kwargs = kwargs)
        func_hl.start()
        return func_hl

    return async_func

# NonBlock API handler
class NonBlockHandler(RequestHandler):

    stopper = None

    @asynchronous
    def get(self, route, *args, **kwargs):
        route = route.strip('/')
        start, stop = api_nonblock[route]
        self.stopper = stop

        start(self.onNewMessage, last_id = self.get_argument('last_id', None))

    def onNewMessage(self, response):
        if self.request.connection.stream.closed():
            return

        self.write(response)

    def on_connection_close(self):

        if self.stopper:
            self.stopper(self.onNewMessage)

        self.stopper = None

def addNonBlockApiView(route, func_tuple, docs = None, **kwargs):
    api_nonblock[route] = func_tuple

    if docs:
        api_docs[route[4:] if route[0:4] == 'api.' else route] = docs
    else:
        api_docs_missing.append(route)

# Blocking API handler
class ApiHandler(RequestHandler):

    @coroutine
    def get(self, route, *args, **kwargs):
        route = route.strip('/')
        if not api.get(route):
            self.write('API call doesn\'t seem to exist')
            return

        api_locks[route].acquire()

        kwargs = {}
        for x in self.request.arguments:
            kwargs[x] = urllib.unquote(self.get_argument(x))

        # Split array arguments
        kwargs = getParams(kwargs)

        # Remove t random string
        try: del kwargs['t']
        except: pass

        # Add async callback handler
        @run_async
        def run_handler(callback):
            result = api[route](**kwargs)
            callback(result)
        result = yield tornado.gen.Task(run_handler)

        # Check JSONP callback
        jsonp_callback = self.get_argument('callback_func', default = None)

        if jsonp_callback:
            self.write(str(jsonp_callback) + '(' + json.dumps(result) + ')')
        elif isinstance(result, (tuple)) and result[0] == 'redirect':
            self.redirect(result[1])
        else:
            self.write(result)

        api_locks[route].release()

def addApiView(route, func, static = False, docs = None, **kwargs):

    if static: func(route)
    else:
        api[route] = func
        api_locks[route] = threading.Lock()

    if docs:
        api_docs[route[4:] if route[0:4] == 'api.' else route] = docs
    else:
        api_docs_missing.append(route)