import os
import requests
import json
import urllib.request
import time
from threading import Thread, Event
from requests.exceptions import RequestException
from tqdm import tqdm
from indexer import indexer
import logging

CACHE_DIR = os.getenv("CACHE_DIR")

download_progress = {}

class Instance:
    def __init__(self, id, url, cache_dir, index_file, token, repo, load_balancer_api, max_retries=20, initial_delay=1):
        self.version = "0.0.0.1 Alpha"
        self.id = id
        self.url = url
        self.CACHE_DIR = cache_dir
        self.INDEX_FILE = index_file
        self.TOKEN = token
        self.REPO = repo
        self.FILM_STORE_JSON_PATH = os.path.join(cache_dir, "film_store.json")
        self.TV_STORE_JSON_PATH = os.path.join(cache_dir, "tv_store.json")
        self.download_threads = {}
        self.file_structure = None
        self.load_balancer_api = load_balancer_api
        self.max_retries = max_retries
        self.initial_delay = initial_delay
        self.last_report_time = time.time()  # Initialize the last report time
        self.re_register_event = Event()

        # Ensure CACHE_DIR exists
        if not os.path.exists(self.CACHE_DIR):
            os.makedirs(self.CACHE_DIR)

        for path in [self.FILM_STORE_JSON_PATH, self.TV_STORE_JSON_PATH]:
            if not os.path.exists(path):
                with open(path, 'w') as json_file:
                    json.dump({}, json_file)

        # Index the file structure and load it
        self.run_indexer_and_load()

        # Start prefetching metadata and monitoring registration
        self.register_to_load_balancer()
        registration_thread = Thread(target=self.monitor_registration)
        registration_thread.daemon = True
        registration_thread.start()

        # Start the thread to re-index every 2 minutes
        indexer_thread = Thread(target=self.run_indexer_periodically)
        indexer_thread.daemon = True
        indexer_thread.start()

    def run_indexer_and_load(self):
        """Runs the indexer and loads the file structure from INDEX_FILE."""
        indexer()
        if not os.path.exists(self.INDEX_FILE):
            raise FileNotFoundError(f"{self.INDEX_FILE} not found. Please make sure the file exists.")

        with open(self.INDEX_FILE, 'r') as f:
            self.file_structure = json.load(f)
        logging.info("File structure reloaded successfully.")

    def run_indexer_periodically(self):
        """Periodically reruns the indexer and reloads the file structure."""
        while True:
            time.sleep(120)  # Wait for 2 minutes
            logging.info("Re-running indexer and reloading file structure.")
            self.run_indexer_and_load()

    def compile_report(self):
        self.last_report_time = time.time()  # Update the last report time
        
        film_store_path = os.path.join(self.CACHE_DIR, "film_store.json")
        tv_store_path = os.path.join(self.CACHE_DIR, "tv_store.json")
        cache_size = self.get_cache_size()

        report = {
            "instance_id": self.id,
            "instance_url": self.url,
            "film_store": self.read_json(film_store_path),
            "tv_store": self.read_json(tv_store_path),
            "cache_size": cache_size
        }
        return report

    def register_to_load_balancer(self):
        result = self.load_balancer_api.register_instance(self.id, self.url)
        if result is not None:
            logging.info(f'Registered instance {self.id} to load balancer.')
        else:
            logging.error(f'Failed to register instance {self.id} to load balancer.')

    def monitor_registration(self):
        while True:
            if time.time() - self.last_report_time > 60:  # Check if 1 minute has passed
                logging.info('1 minute passed since last report. Re-registering...')
                self.register_to_load_balancer()
                self.last_report_time = time.time()  # Reset the last report time
            time.sleep(30)  # Check every 30 seconds

    def get_cache_size(self):
        total_size = 0
        for dirpath, dirnames, filenames in os.walk(CACHE_DIR):
            for f in filenames:
                fp = os.path.join(dirpath, f)
                total_size += os.path.getsize(fp)
        return {"cache_size": f"{total_size / (1024 * 1024 * 1024):.2f} GB"}

    @staticmethod
    def read_json(file_path):
        if os.path.exists(file_path):
            with open(file_path, 'r') as json_file:
                return json.load(json_file)
        return {}

    @staticmethod
    def get_system_proxies():
        """
        Retrieves the system's HTTP and HTTPS proxies.

        Returns:
            dict: A dictionary containing the proxies.
        """
        try:
            proxies = urllib.request.getproxies()
            print("System proxies:", proxies)
            return {
                "http": proxies.get("http"),
                "https": proxies.get("http")
            }
        except Exception as e:
            print(f"Error getting system proxies: {e}")
            return {}

    def download_film(self, file_url, token, cache_path, proxies, film_id, title, chunk_size=100 * 1024 * 1024):
        """
        Downloads a file from the specified URL and saves it to the cache path.
        Tracks the download progress.

        Args:
            file_url (str): The URL of the file to download.
            token (str): The authorization token for the request.
            cache_path (str): The path to save the downloaded file.
            proxies (dict): Proxies for the request.
            film_id (str): Unique identifier for the film download.
            title (str): The title of the film.
            chunk_size (int): Size of each chunk to download.
        """
        print(f"Downloading file from URL: {file_url} to {cache_path} with proxies: {proxies}")
        headers = {'Authorization': f'Bearer {token}'}
        try:
            response = requests.get(file_url, headers=headers, proxies=proxies, stream=True)
            response.raise_for_status()
            
            total_size = int(response.headers.get('content-length', 0))
            download_progress[film_id] = {"total": total_size, "downloaded": 0, "status": "Downloading", "start_time": time.time()}

            os.makedirs(os.path.dirname(cache_path), exist_ok=True)
            with open(cache_path, 'wb') as file, tqdm(total=total_size, unit='B', unit_scale=True, desc=cache_path) as pbar:
                for data in response.iter_content(chunk_size=chunk_size):
                    file.write(data)
                    pbar.update(len(data))
                    download_progress[film_id]["downloaded"] += len(data)
            
            print(f'File cached to {cache_path} successfully.')
            self.update_film_store_json(title, cache_path)
            download_progress[film_id]["status"] = "Completed"
        except RequestException as e:
            print(f"Error downloading file: {e}")
            download_progress[film_id]["status"] = "Failed"
        except IOError as e:
            print(f"Error writing file {cache_path}: {e}")
            download_progress[film_id]["status"] = "Failed"
        finally:
            if download_progress[film_id]["status"] != "Downloading":
                download_progress[film_id]["end_time"] = time.time()

    @staticmethod
    def get_download_progress(id):
        """
        Gets the download progress for a specific film.

        Args:
            film_id (str): The unique identifier for the film download.

        Returns:
            dict: A dictionary containing the total size, downloaded size, progress percentage, status, and ETA.
        """
        if id in download_progress:
            total = download_progress[id]["total"]
            downloaded = download_progress[id]["downloaded"]
            status = download_progress[id].get("status", "In Progress")
            progress = (downloaded / total) * 100 if total > 0 else 0

            eta = None
            if status == "Downloading" and downloaded > 0:
                elapsed_time = time.time() - download_progress[id]["start_time"]
                estimated_total_time = elapsed_time * (total / downloaded)
                eta = estimated_total_time - elapsed_time
            elif status == "Completed":
                eta = 0

            return {"total": total, "downloaded": downloaded, "progress": progress, "status": status, "eta": eta}
        return {"total": 0, "downloaded": 0, "progress": 0, "status": "Not Found", "eta": None}

    def update_film_store_json(self,title, cache_path):
        """
        Updates the film store JSON with the new file.

        Args:
            title (str): The title of the film.
            cache_path (str): The local path where the file is saved.
        """
        film_store_data = {}
        if os.path.exists(self.FILM_STORE_JSON_PATH):
            with open(self.FILM_STORE_JSON_PATH, 'r') as json_file:
                film_store_data = json.load(json_file)

        film_store_data[title] = cache_path

        with open(self.FILM_STORE_JSON_PATH, 'w') as json_file:
            json.dump(film_store_data, json_file, indent=2)
        print(f'Film store updated with {title}.')

    def download_episode(self, file_url, token, cache_path, proxies, episode_id, title, chunk_size=100 * 1024 * 1024):
        """
        Downloads a file from the specified URL and saves it to the cache path.
        Tracks the download progress.

        Args:
            file_url (str): The URL of the file to download.
            token (str): The authorization token for the request.
            cache_path (str): The path to save the downloaded file.
            proxies (dict): Proxies for the request.
            episode_id (str): Unique identifier for the film download.
            title (str): The title of the film.
            chunk_size (int): Size of each chunk to download.
        """
        print(f"Downloading file from URL: {file_url} to {cache_path} with proxies: {proxies}")
        headers = {'Authorization': f'Bearer {token}'}
        try:
            response = requests.get(file_url, headers=headers, proxies=proxies, stream=True)
            response.raise_for_status()
            
            total_size = int(response.headers.get('content-length', 0))
            download_progress[episode_id] = {"total": total_size, "downloaded": 0, "status": "Downloading", "start_time": time.time()}

            os.makedirs(os.path.dirname(cache_path), exist_ok=True)
            with open(cache_path, 'wb') as file, tqdm(total=total_size, unit='B', unit_scale=True, desc=cache_path) as pbar:
                for data in response.iter_content(chunk_size=chunk_size):
                    file.write(data)
                    pbar.update(len(data))
                    download_progress[episode_id]["downloaded"] += len(data)
            
            print(f'File cached to {cache_path} successfully.')
            self.update_tv_store_json(title, cache_path)
            download_progress[episode_id]["status"] = "Completed"
        except RequestException as e:
            print(f"Error downloading file: {e}")
            download_progress[episode_id]["status"] = "Failed"
        except IOError as e:
            print(f"Error writing file {cache_path}: {e}")
            download_progress[episode_id]["status"] = "Failed"
        finally:
            if download_progress[episode_id]["status"] != "Downloading":
                download_progress[episode_id]["end_time"] = time.time()

    def update_tv_store_json(self, title, cache_path):
        """
        Updates the TV store JSON with the new file, organizing by title, season, and episode.

        Args:
            title (str): The title of the TV show.
            cache_path (str): The local path where the file is saved.
        """
        tv_store_data = {}
        if os.path.exists(self.TV_STORE_JSON_PATH):
            with open(self.TV_STORE_JSON_PATH, 'r') as json_file:
                tv_store_data = json.load(json_file)

        # Extract season and episode information from the cache_path
        season_part = os.path.basename(os.path.dirname(cache_path))  # Extracts 'Season 1'
        episode_part = os.path.basename(cache_path)  # Extracts 'Grand Blue Dreaming - S01E01 - Deep Blue HDTV-720p.mp4'

        # Create the structure if not already present
        if title not in tv_store_data:
            tv_store_data[title] = {}
        
        if season_part not in tv_store_data[title]:
            tv_store_data[title][season_part] = {}

        # Assuming episode_part is unique for each episode within a season
        tv_store_data[title][season_part][episode_part] = cache_path

        with open(self.TV_STORE_JSON_PATH, 'w') as json_file:
            json.dump(tv_store_data, json_file, indent=2)

        print(f'TV store updated with {title}, {season_part}, {episode_part}.')


    def load_json(self, file_path):
        """Load JSON data from a file."""
        with open(file_path, 'r') as file:
            return json.load(file)

    def find_movie_path(self, title):
        """Find the path of the movie in the JSON data based on the title."""
        for directory in self.file_structure:
            if directory['type'] == 'directory' and directory['path'] == 'films':
                for sub_directory in directory['contents']:
                    if sub_directory['type'] == 'directory':
                        for item in sub_directory['contents']:
                            if item['type'] == 'file' and title.lower() in item['path'].lower():
                                return item['path']
        return None

    def find_tv_path(self, title):
        """Find the path of the TV show in the JSON data based on the title."""
        for directory in self.file_structure:
            if directory['type'] == 'directory' and directory['path'] == 'tv':
                for sub_directory in directory['contents']:
                    if sub_directory['type'] == 'directory' and title.lower() in sub_directory['path'].lower():
                        return sub_directory['path']
        return None

    def get_tv_structure(self, title):
        """Find the path of the TV show in the JSON data based on the title."""
        for directory in self.file_structure:
            if directory['type'] == 'directory' and directory['path'] == 'tv':
                for sub_directory in directory['contents']:
                    if sub_directory['type'] == 'directory' and title.lower() in sub_directory['path'].lower():
                        return sub_directory
        return None

    def get_film_id(self, title):
        """Generate a film ID based on the title."""
        return title.replace(" ", "_").lower()

    def bytes_to_human_readable(self, num, suffix="B"):
        for unit in ["", "K", "M", "G", "T", "P", "E", "Z"]:
            if abs(num) < 1024.0:
                return f"{num:3.1f} {unit}{suffix}"
            num /= 1024.0
        return f"{num:.1f} Y{suffix}"

    def encode_episodeid(self, title, season, episode):
        return f"{title}_{season}_{episode}"

    def get_all_tv_shows(self):
        """Get all TV shows from the indexed cache structure JSON file."""
        tv_shows = {}
        for directory in self.file_structure:
            if directory['type'] == 'directory' and directory['path'] == 'tv':
                for sub_directory in directory['contents']:
                    if sub_directory['type'] == 'directory':
                        show_title = sub_directory['path'].split('/')[-1]
                        tv_shows[show_title] = []
                        for season_directory in sub_directory['contents']:
                            if season_directory['type'] == 'directory':
                                season = season_directory['path'].split('/')[-1]
                                for episode in season_directory['contents']:
                                    if episode['type'] == 'file':
                                        tv_shows[show_title].append({
                                            "season": season,
                                            "episode": episode['path'].split('/')[-1],
                                            "path": episode['path']
                                        })
        return tv_shows

    def get_all_films(self):
        """Get all films from the indexed cache structure JSON file."""
        films = []
        for directory in self.file_structure:
            if directory['type'] == 'directory' and directory['path'] == 'films':
                for sub_directory in directory['contents']:
                    if sub_directory['type'] == 'directory':
                        films.append(sub_directory['path'])
        return films

    def register_to_load_balancer(self):
        retries = 0
        delay = self.initial_delay
        max_delay = 120

        while True:
            try:
                result = self.load_balancer_api.register_instance(self.id, self.url)
                if result:
                    logging.info(f'Successfully registered instance {self.id} to load balancer.')
                    return result

            except Exception as e:
                logging.error(f'Error during registration: {e}')
            
            retries += 1
            logging.warning(f'Attempt {retries} to register instance {self.id} failed. Retrying in {delay} seconds...')
            time.sleep(delay)
            delay = min(delay * 2, max_delay)  # Exponential backoff with maximum delay