import http.server, json, threading, uuid, urllib.parse
import flask
from src import utils

_bot = None
_events = None
class Handler(http.server.BaseHTTPRequestHandler):
    timeout = 10
    def _handle(self, method, path, params):
        _, _, endpoint = path[1:].partition("/")
        endpoint, _, args = endpoint.partition("/")
        args = list(filter(None, args.split("/")))

        response = ""
        code = 404

        hooks = _events.on("api").on(method).on(endpoint).get_hooks()
        if hooks:
            hook = hooks[0]
            authenticated = hook.get_kwarg("authenticated", True)
            key = params.get("key", None)
            if authenticated and (not key or not _bot.get_setting(
                    "api-key-%s" % key, False)):
                code = 401
            else:
                if path.startswith("/api/"):
                    response = _events.on("api").on(method).on(endpoint
                        ).call_for_result(params=params, path=args)

                    if response:
                        response = json.dumps(response, sort_keys=True,
                            indent=4)
                        code = 200

        self.send_response(code)
        self.send_header("Content-type", "application/json")
        self.end_headers()
        self.wfile.write(response.encode("utf8"))
    def _safe_handle(self, method, path, params):
        _bot.lock.acquire()
        try:
            self._handle(method, path, params)
        except:
            pass
        finally:
            _bot.lock.release()

    def _decode_params(self, s):
        params = urllib.parse.parse_qs(s)
        return dict([(k, v[0]) for k, v in params.items()])

    def do_GET(self):
        parsed = urllib.parse.urlparse(self.path)
        get_params = self._decode_params(parsed.query)
        self._handle("get", parsed.path, get_params)

    def do_POST(self):
        parsed = urllib.parse.urlparse(self.path)
        content_length = int(self.headers.get("content-length", 0))
        post_body = self.rfile.read(content_length)
        post_params = self._decode_params(post_body)
        self._handle("post", parsed.path, post_params)

@utils.export("botset", {"setting": "rest-api",
    "help": "Enable/disable REST API",
    "validate": utils.bool_or_none})
class Module(object):
    def __init__(self, bot, events, exports):
        self.bot = bot
        global _bot
        _bot = bot

        self.events = events
        global _events
        _events = events

        if bot.get_setting("rest-api", False):
            self.httpd = http.server.HTTPServer(("", 5000), Handler)
            self.thread = threading.Thread(target=self.httpd.serve_forever)
            self.thread.daemon = True
            self.thread.start()

    def unload(self):
        self.httpd.shutdown()

    @utils.hook("received.command.apikey", private_only=True)
    def api_key(self, event):
        """
        :help: Generate a new API key
        :permission: api-key
        :prefix: APIKey
        """
        api_key = str(uuid.uuid4())
        self.bot.set_setting("api-key-%s" % api_key, True)
        event["stdout"].write(api_key)