from functools import wraps
from urllib.parse import unquote
import json
import logging
import os
import queue
import shutil
import threading
import time

import requests
from tornado.httpserver import HTTPServer
from tornado.ioloop import IOLoop
from tornado.web import StaticFileHandler, Application, HTTPError
import tornado.gen
import tornado.web


from action import Camera


logger = logging.getLogger(__name__)

STATIC_PATH = 'static'
PORT = 8000
ADDRESS = '127.0.0.1'

with open('camera.json') as fd:
    CAMERA = json.load(fd)

state = {
    'time': {},
    'status': 'Idle'
}

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

def _to_json(python_object):
    if isinstance(python_object, datetime.datetime):
        if python_object.year < 1900:
            tt = python_object.timetuple()
            return '%d-%02d-%02dT%02d:%02d%02dZ' % tuple(list(tt)[:6])
        return python_object.strftime('%Y-%m-%dT%H:%M:%SZ')
    raise TypeError('%s %s is not JSON serializable' % (repr(python_object), type(python_object)))

def json_dumps(obj):
    return json.dumps(obj, indent=4, default=_to_json, ensure_ascii=False, sort_keys=True).encode()

class ControlQueue:
    shutdown = False

    def worker(self):
        while True:
            item = self.q.get()
            if item is None or self.shutdown:
                break
            state['status'] = 'Active'
            self.camera.sequence(**item)
            if self.camera.abort:
                self.camera.abort = False
            state['status'] = 'Idle'

    def __init__(self):
        self.q = queue.Queue()
        self.camera = Camera(**CAMERA)
        self._worker = threading.Thread(target=self.worker)
        self._worker.start()

    def put(self, filename):
        self.q.put(filename)

    def join(self):
        self.shutdown = True
        self.camera.abort = True
        # block until all tasks are done
        self.q.join()

        self.q.put(None)
        self._worker.join()


class API(object):

    def __call__(self, method, kwargs):
        return getattr(self, method)(**kwargs)

    def getPresets(self, **data):
        result = {}
        result['presets'] = ctl.camera.get_presets(True)
        return result

    def camera(self, **data):
        result = {}
        for key, value in data.items():
            getattr(ctl.camera, key)(**value)
        return result

    def run(self, **data):
        result = {}
        ctl.put(data)
        return result

    def stop(self, **data):
        result = {}
        ctl.camera.abort = True
        ctl.camera.continuous(ctl.camera.STOP)
        return result

    def status(self, **data):
        result = {}
        result['time'] = ctl.camera.segment_times
        result['status'] = state['status']
        if result['status'] == 'Active':
            if ctl.camera.sequence_start:
                result['duration'] = int(time.time() - ctl.camera.sequence_start)
            else:
                result['duration'] = '...'
            result['next'] = ctl.camera.next_target
        else:
            result['duration'] = ctl.camera.sequence_time
        result['position'] = ctl.camera.last_position
        return result

#@run_async
def api_task(request, callback):
    api = API()
    response = {
        'result': api(request['method'], request.get('params', {}))
    }
    callback(response)

class RPCHandler(tornado.web.RequestHandler):

    def get(self):
        self.write(BANNER)

    @tornado.gen.coroutine
    def post(self):
        error = None
        request = None
        try:
            request = json.loads(self.request.body.decode())
            if request['method'][0] == '_' or not hasattr(API, request['method']):
                raise Exception('unknown method')
        except:
            error = {'error': {'code': -32700, 'message': 'Parse error'}}
        if not error:
            try:
                response = yield tornado.gen.Task(api_task, request)
            except:
                logger.error("ERROR: %s", request, exc_info=True)
                error = {'error': {'code': -32000, 'message': 'Server error'}}
        if error:
            response = error
        if request and 'id' in request:
            response['id'] = request['id']
        response['jsonrpc'] = '2.0'
        response = json_dumps(response)
        self.write(response)

def prepare(encoding):
    if not os.path.exists(settings['prefix']):
        print('please create "%s" and start again' % settings['prefix'])
        sys.exit(1)
    index = os.path.join(settings['prefix'], 'index.html')
    if not os.path.exists(index):
        try:
            with open(index, 'w') as fd:
                fd.write(BANNER_PUBLIC)
        except:
            print('can not write to "%s"' % settings['prefix'])
            sys.exit(1)
    load_files(encoding)
    registered = False
    while not registered:
        try:
            register_server()
        except:
            logging.error('failed to register')
            time.sleep(10)
        registered = True

class MainHandler(tornado.web.RequestHandler):

    def get(self, path):
        path = os.path.join(STATIC_PATH, 'index.html')
        with open(path) as fd:
            content = fd.read()
        self.set_header('Content-Type', 'text/html')
        self.set_header('Content-Length', str(len(content)))
        self.set_header('Cache-Control', 'no-cache, no-store, must-revalidate')
        self.set_header('Pragma', 'no-cache')
        self.set_header('Expires', '0')
        self.write(content)

def main():
    global ctl
    ctl = ControlQueue()
    handlers = [
        (r'/api/', RPCHandler),
        (r'/static/(.*)', StaticFileHandler, {'path': STATIC_PATH}),
        (r"(.*)", MainHandler),
    ]

    options = {
        'debug': False,
        'gzip': True,
    }
    app = Application(handlers, **options)
    app.listen(PORT, ADDRESS)

    main = IOLoop.instance()
    try:
        main.start()
    except:
        print('shutting down...')
    ctl.join()


if __name__ == '__main__':
    main()