import logging
import threading
import time
from typing import List, Dict, Optional, Set
from urllib.parse import urlparse, urlunsplit, ParseResult

import requests
import responses
from tqdm import tqdm

from .cache import Cache
from .rotating import RotatingProxy
from ..objects import Target
from ..utils.config import main_settings
from ..utils.support_classes.download_result import DownloadResult


class Connection:
    def __init__(
            self,
            host: str,
            proxies: List[dict] = None,
            tries: int = (len(main_settings["proxies"]) + 1) * 4,
            timeout: int = 7,
            logger: logging.Logger = logging.getLogger("connection"),
            header_values: Dict[str, str] = None,
            accepted_response_codes: Set[int] = None,
            semantic_not_found: bool = True,
            sleep_after_404: float = 0.0,
            heartbeat_interval=0,
            module: str = "general",
            cache_expiring_duration: float = 10
    ):
        if proxies is None:
            proxies = main_settings["proxies"]
        if header_values is None:
            header_values = dict()

        self.cache: Cache = Cache(module=module, logger=logger)
        self.cache_expiring_duration = cache_expiring_duration

        self.HEADER_VALUES = header_values

        self.LOGGER = logger
        self.HOST = urlparse(host)
        self.TRIES = tries
        self.TIMEOUT = timeout
        self.rotating_proxy = RotatingProxy(proxy_list=proxies)

        self.ACCEPTED_RESPONSE_CODES = accepted_response_codes or {200}
        self.SEMANTIC_NOT_FOUND = semantic_not_found
        self.sleep_after_404 = sleep_after_404

        self.session = requests.Session()
        self.session.headers = self.get_header(**self.HEADER_VALUES)
        self.session.proxies = self.rotating_proxy.current_proxy

        self.session_is_occupied: bool = False

        self.heartbeat_thread = None
        self.heartbeat_interval = heartbeat_interval

    @property
    def user_agent(self) -> str:
        return self.session.headers.get("user-agent",
                                        "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36")

    def start_heartbeat(self):
        if self.heartbeat_interval <= 0:
            self.LOGGER.warning(f"Can't start a heartbeat with {self.heartbeat_interval}s in between.")

        self.heartbeat_thread = threading.Thread(target=self._heartbeat_loop, args=(self.heartbeat_interval,),
                                                 daemon=True)
        self.heartbeat_thread.start()

    def heartbeat_failed(self):
        self.LOGGER.warning(f"I just died... (The heartbeat failed)")

    def heartbeat(self):
        # Your code to send heartbeat requests goes here
        print(
            "the hearth is beating, but it needs to be implemented ;-;\nFuck youuuu for setting heartbeat in the constructor to true, but not implementing the method Connection.hearbeat()")

    def _heartbeat_loop(self, interval: float):
        def heartbeat_wrapper():
            self.session_is_occupied = True
            self.LOGGER.debug(f"I am living. (sending a heartbeat)")
            self.heartbeat()
            self.LOGGER.debug(f"finished the heartbeat")
            self.session_is_occupied = False

        while True:
            heartbeat_wrapper()
            time.sleep(interval)

    def base_url(self, url: ParseResult = None):
        if url is None:
            url = self.HOST

        return urlunsplit((url.scheme, url.netloc, "", "", ""))

    def get_header(self, **header_values) -> Dict[str, str]:
        return {
            "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36",
            "Connection": "keep-alive",
            # "Host": self.HOST.netloc,
            "Referer": self.base_url(),
            **header_values
        }

    def rotate(self):
        self.session.proxies = self.rotating_proxy.rotate()

    def _update_headers(
            self,
            headers: Optional[dict],
            refer_from_origin: bool,
            url: ParseResult
    ) -> Dict[str, str]:
        if headers is None:
            headers = dict()

        if not refer_from_origin:
            headers["Referer"] = self.base_url(url=url)

        return headers

    def save(self, r: requests.Response, name: str, **kwargs):
        self.cache.set(r.content, name, expires_in=kwargs.get("expires_in", self.cache_expiring_duration))

    def request(
            self,
            method: str,
            try_count: int,
            accepted_response_codes: set,
            url: str,
            timeout: float,
            headers: dict,
            refer_from_origin: bool = True,
            raw_url: bool = False,
            sleep_after_404: float = None,
            is_heartbeat: bool = False,
            name: str = "",
            **kwargs
    ) -> Optional[requests.Response]:
        if name != "":
            cached = self.cache.get(name)

            with responses.RequestsMock() as resp:
                resp.add(
                    method=method,
                    url=url,
                    body=cached,
                )
                return requests.request(method=method, url=url, timeout=timeout, headers=headers, **kwargs)

        if sleep_after_404 is None:
            sleep_after_404 = self.sleep_after_404
        if try_count >= self.TRIES:
            return

        if timeout is None:
            timeout = self.TIMEOUT

        parsed_url = urlparse(url)

        headers = self._update_headers(
            headers=headers,
            refer_from_origin=refer_from_origin,
            url=parsed_url
        )

        request_url = parsed_url.geturl() if not raw_url else url

        connection_failed = False
        try:
            if self.session_is_occupied and not is_heartbeat:
                self.LOGGER.info(f"Waiting for the heartbeat to finish.")
                while self.session_is_occupied and not is_heartbeat:
                    pass

            r: requests.Response = requests.request(method=method, url=url, timeout=timeout, headers=headers, **kwargs)

            if r.status_code in accepted_response_codes:
                self.save(r, name, **kwargs)
                return r

            if self.SEMANTIC_NOT_FOUND and r.status_code == 404:
                self.LOGGER.warning(f"Couldn't find url (404): {request_url}")
                return None

        except requests.exceptions.Timeout:
            self.LOGGER.warning(f"Request timed out at \"{request_url}\": ({try_count}-{self.TRIES})")
            connection_failed = True
        except requests.exceptions.ConnectionError:
            self.LOGGER.warning(f"Couldn't connect to \"{request_url}\": ({try_count}-{self.TRIES})")
            connection_failed = True

        if not connection_failed:
            self.LOGGER.warning(f"{self.HOST.netloc} responded wit {r.status_code} "
                                f"at {url}. ({try_count}-{self.TRIES})")
            self.LOGGER.debug(r.content)
            if sleep_after_404 != 0:
                self.LOGGER.warning(f"Waiting for {sleep_after_404} seconds.")
                time.sleep(sleep_after_404)

        self.rotate()

        if self.heartbeat_interval > 0 and self.heartbeat_thread is None:
            self.start_heartbeat()

        return self.request(
            method=method,
            try_count=try_count + 1,
            accepted_response_codes=accepted_response_codes,
            url=url,
            timeout=timeout,
            headers=headers,
            sleep_after_404=sleep_after_404,
            is_heartbeat=is_heartbeat,
            name=name,
            **kwargs
        )

    def get(
            self,
            url: str,
            refer_from_origin: bool = True,
            stream: bool = False,
            accepted_response_codes: set = None,
            timeout: float = None,
            headers: dict = None,
            raw_url: bool = False,
            **kwargs
    ) -> Optional[requests.Response]:
        if accepted_response_codes is None:
            accepted_response_codes = self.ACCEPTED_RESPONSE_CODES

        r = self.request(
            method="GET",
            try_count=0,
            accepted_response_codes=accepted_response_codes,
            url=url,
            timeout=timeout,
            headers=headers,
            raw_url=raw_url,
            refer_from_origin=refer_from_origin,
            stream=stream,
            **kwargs
        )
        if r is None:
            self.LOGGER.warning(f"Max attempts ({self.TRIES}) exceeded for: GET:{url}")
        return r

    def post(
            self,
            url: str,
            json: dict = None,
            refer_from_origin: bool = True,
            stream: bool = False,
            accepted_response_codes: set = None,
            timeout: float = None,
            headers: dict = None,
            raw_url: bool = False,
            **kwargs
    ) -> Optional[requests.Response]:
        r = self.request(
            method="POST",
            try_count=0,
            accepted_response_codes=accepted_response_codes or self.ACCEPTED_RESPONSE_CODES,
            url=url,
            timeout=timeout,
            headers=headers,
            refer_from_origin=refer_from_origin,
            raw_url=raw_url,
            json=json,
            stream=stream,
            **kwargs
        )
        if r is None:
            self.LOGGER.warning(f"Max attempts ({self.TRIES}) exceeded for: GET:{url}")
            self.LOGGER.warning(f"payload: {json}")
        return r

    def stream_into(
            self,
            url: str,
            target: Target,
            description: str = "download",
            refer_from_origin: bool = True,
            accepted_response_codes: set = None,
            timeout: float = None,
            headers: dict = None,
            raw_url: bool = False,
            chunk_size: int = main_settings["chunk_size"],
            try_count: int = 0,
            progress: int = 0,
            **kwargs
    ) -> DownloadResult:

        if progress > 0:
            if headers is None:
                headers = dict()
            headers["Range"] = f"bytes={target.size}-"

        if accepted_response_codes is None:
            accepted_response_codes = self.ACCEPTED_RESPONSE_CODES

        r = self.request(
            method="GET",
            try_count=0,
            accepted_response_codes=accepted_response_codes,
            url=url,
            timeout=timeout,
            headers=headers,
            raw_url=raw_url,
            refer_from_origin=refer_from_origin,
            stream=True,
            **kwargs
        )

        if r is None:
            return DownloadResult(error_message=f"Could not establish connection to: {url}")

        target.create_path()
        total_size = int(r.headers.get('content-length'))
        progress = 0

        retry = False

        with target.open("ab") as f:
            """
            https://en.wikipedia.org/wiki/Kilobyte
            > The internationally recommended unit symbol for the kilobyte is kB.
            """

            with tqdm(total=total_size - target.size, unit='B', unit_scale=True, unit_divisor=1024,
                      desc=description) as t:
                try:
                    for chunk in r.iter_content(chunk_size=chunk_size):
                        size = f.write(chunk)
                        progress += size
                        t.update(size)

                except requests.exceptions.ConnectionError:
                    if try_count >= self.TRIES:
                        self.LOGGER.warning(f"Stream timed out at \"{url}\": to many retries, aborting.")
                        return DownloadResult(
                            error_message=f"Stream timed out from {url}, reducing the chunksize might help.")

                    self.LOGGER.warning(f"Stream timed out at \"{url}\": ({try_count}-{self.TRIES})")
                    retry = True

            if total_size > progress:
                retry = True

            if retry:
                self.LOGGER.warning(f"Retrying stream...")
                accepted_response_codes.add(206)
                return self.stream_into(
                    url=url,
                    target=target,
                    description=description,
                    try_count=try_count + 1,
                    progress=progress,
                    accepted_response_codes=accepted_response_codes,
                    timeout=timeout,
                    headers=headers,
                    raw_url=raw_url,
                    refer_from_origin=refer_from_origin,
                    chunk_size=chunk_size,
                    **kwargs
                )

            return DownloadResult()