import os
import mimetypes
import json
import pkg_resources
from datetime import datetime
from string import Template
from owrx.websocket import WebSocketConnection
from owrx.config import PropertyManager
from owrx.source import ClientRegistry
from owrx.connection import WebSocketMessageHandler
from owrx.version import openwebrx_version
from owrx.feature import FeatureDetector
from owrx.metrics import Metrics

import logging

logger = logging.getLogger(__name__)


class Controller(object):
    def __init__(self, handler, request):
        self.handler = handler
        self.request = request

    def send_response(self, content, code=200, content_type="text/html", last_modified: datetime = None, max_age=None):
        self.handler.send_response(code)
        if content_type is not None:
            self.handler.send_header("Content-Type", content_type)
        if last_modified is not None:
            self.handler.send_header("Last-Modified", last_modified.strftime("%a, %d %b %Y %H:%M:%S GMT"))
        if max_age is not None:
            self.handler.send_header("Cache-Control", "max-age: {0}".format(max_age))
        self.handler.end_headers()
        if type(content) == str:
            content = content.encode()
        self.handler.wfile.write(content)


class StatusController(Controller):
    def handle_request(self):
        pm = PropertyManager.getSharedInstance()
        # TODO keys that have been left out since they are no longer simple strings: sdr_hw, bands, antenna
        vars = {
            "status": "active",
            "name": pm["receiver_name"],
            "op_email": pm["receiver_admin"],
            "users": ClientRegistry.getSharedInstance().clientCount(),
            "users_max": pm["max_clients"],
            "gps": pm["receiver_gps"],
            "asl": pm["receiver_asl"],
            "loc": pm["receiver_location"],
            "sw_version": openwebrx_version,
            "avatar_ctime": os.path.getctime("htdocs/gfx/openwebrx-avatar.png"),
        }
        self.send_response("\n".join(["{key}={value}".format(key=key, value=value) for key, value in vars.items()]))


class AssetsController(Controller):
    def getModified(self, file):
        return None

    def openFile(self, file):
        pass

    def serve_file(self, file, content_type=None):
        try:
            modified = self.getModified(file)

            if modified is not None and "If-Modified-Since" in self.handler.headers:
                client_modified = datetime.strptime(
                    self.handler.headers["If-Modified-Since"], "%a, %d %b %Y %H:%M:%S %Z"
                )
                if modified <= client_modified:
                    self.send_response("", code=304)
                    return

            f = self.openFile(file)
            data = f.read()
            f.close()

            if content_type is None:
                (content_type, encoding) = mimetypes.MimeTypes().guess_type(file)
            self.send_response(data, content_type=content_type, last_modified=modified, max_age=3600)
        except FileNotFoundError:
            logger.debug("404")
            self.send_response("file not found", code=404)

    def handle_request(self):
        filename = self.request.matches.group(1)
        self.serve_file(filename)


class OwrxAssetsController(AssetsController):
    def openFile(self, file):
        return pkg_resources.resource_stream('htdocs', file)


class AprsSymbolsController(AssetsController):
    def __init__(self, handler, request):
        pm = PropertyManager.getSharedInstance()
        path = pm["aprs_symbols_path"]
        if not path.endswith("/"):
            path += "/"
        self.path = path
        super().__init__(handler, request)

    def getFilePath(self, file):
        return self.path + file

    def getModified(self, file):
        return datetime.fromtimestamp(os.path.getmtime(self.getFilePath(file)))

    def openFile(self, file):
        return open(self.getFilePath(file), "rb")


class TemplateController(Controller):
    def render_template(self, file, **vars):
        file_content = pkg_resources.resource_string("htdocs", file).decode("utf-8")
        template = Template(file_content)

        return template.safe_substitute(**vars)

    def serve_template(self, file, **vars):
        self.send_response(self.render_template(file, **vars), content_type="text/html")

    def default_variables(self):
        return {}


class WebpageController(TemplateController):
    def template_variables(self):
        header = self.render_template("include/header.include.html")
        return {"header": header}


class IndexController(WebpageController):
    def handle_request(self):
        self.serve_template("index.html", **self.template_variables())


class MapController(WebpageController):
    def handle_request(self):
        # TODO check if we have a google maps api key first?
        self.serve_template("map.html", **self.template_variables())


class FeatureController(WebpageController):
    def handle_request(self):
        self.serve_template("features.html", **self.template_variables())


class ApiController(Controller):
    def handle_request(self):
        data = json.dumps(FeatureDetector().feature_report())
        self.send_response(data, content_type="application/json")


class MetricsController(Controller):
    def handle_request(self):
        data = json.dumps(Metrics.getSharedInstance().getMetrics())
        self.send_response(data, content_type="application/json")


class WebSocketController(Controller):
    def handle_request(self):
        conn = WebSocketConnection(self.handler, WebSocketMessageHandler())
        # enter read loop
        conn.handle()