#!/usr/bin/python3.12

import threading
import socket
import logging

import config


MAX_REQLINE = 64 * 1024

STATUS_CODE = {
    200: "OK",
    404: "Not Found",
    500: "Internal Server Error",
}


class Response:
    def __init__(self, status_code=200, additional_headers={}, data=None):
        self.status_code = status_code
        self.additional_headers = additional_headers
        self.data = data

    def get(self):
        resp = f"HTTP/1.1 {self.status_code} {STATUS_CODE[self.status_code]}\r\n"
        resp += "Server: cnserv\r\n"
        resp += "Connection: close\r\n"
        resp += "\r\n"

        resp = resp.encode("UTF-8")

        if self.data:
            resp += self.data

        return resp


class HTTPHandler:
    http_type = ""
    http_address = ""
    headers = {}
    data = b""

    def __init__(self, conn, addr):
        self.conn = conn
        self.addr = addr

        self.read_fb = conn.makefile("rb")
        self.write_fb = conn.makefile("wb")

        self.pre_handle_connection()

    def pre_handle_connection(self):
        raw = self.read_fb.readline(MAX_REQLINE + 1)

        if len(raw) > MAX_REQLINE:
            logging.debug("Request line too long")
            self.conn.send(b"")
            self.conn.close()
            return

        req_line = raw.decode().rstrip("\r\n")
        req_line_splited = req_line.split(" ")

        if len(req_line_splited) != 3:
            logging.debug("Request head too long")
            self.conn.send(b"")
            self.conn.close()
            return

        if req_line_splited[2] == "HTTP/1.0" or req_line_splited[2] == "HTTP/1.1":
            self.http_type = req_line_splited[0]
            self.http_address = req_line_splited[1]
            self.http_header_handle()
        else:
            self.conn.send(b"")
            self.conn.close()

    def http_header_handle(self):
        while True:
            raw = self.read_fb.readline(MAX_REQLINE + 1)

            if len(raw) > MAX_REQLINE:
                logging.debug("Request header line too long")
                self.conn.send(b"")
                self.conn.close()
                return

            if raw == b"":
                self.conn.send(b"")
                self.conn.close()
                return

            if raw == b"\r\n":
                self.http_data_handle()
                break
            else:
                decoded_data = raw.decode("UTF-8").rstrip("\r\n")
                decoded_data_split = decoded_data.split(":", 1)
                self.headers.update({decoded_data_split[0]: decoded_data_split[1].strip(" ")})

    def http_data_handle(self):
        # TODO: Get from headers Content-Length and get body from request
        """

        raw = self.read_fb.readline(1024)

        if len(raw) == 1024:
            while True:
                self.data += raw

                if len(raw) < 1024:
                    break
                else:
                    raw = self.read_fb.readline(1024)
        """

        logging.debug(self.http_type)
        logging.debug(self.http_address)
        logging.debug(self.headers)
        logging.debug(self.data)

        self.send_form_data()

    def send_form_data(self):
        if self.http_type == "GET":
            if self.http_address == "/":
                r = Response(data=b"Tested!")
                self.write_fb.write(r.get())

            elif self.http_address == "/server-status":
                form_data = "{\"server-name\": \"cnserv\", \"state\": \"running\"}"
                r = Response(data=form_data.encode("UTF-8"))
                self.write_fb.write(r.get())

            else:
                form_data = "Not found!"
                r = Response(status_code=404, data=form_data.encode("UTF-8"))
                self.write_fb.write(r.get())

            self.write_fb.flush()

        self.write_fb.close()
        self.read_fb.close()
        self.conn.close()


if __name__ == "__main__":
    logging.basicConfig(filename="main.log", filemode="a", encoding="UTF-8",
        level=logging.DEBUG, format="[%(asctime)s][%(levelname)s] %(message)s")

    logging.info("=== Separator ===")
    try:
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as main_server_socket:
            main_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
            main_server_socket.bind(("0.0.0.0", config.SETUP["server"]["port"]))
            main_server_socket.listen()

            while True:
                conn, addr = main_server_socket.accept()
                logging.info("Accept connection from %s", addr[0])

                thr_serv_conn = threading.Thread(target=HTTPHandler, args=(conn, addr,))
                thr_serv_conn.run()

    except KeyboardInterrupt:
        logging.info("Server get keyboard interrupt. Initialize server to stop")