"""
Stream monitoring and API interaction for Twitch Archive.
"""

import os
import sys
from typing import Dict, Optional, Any
import requests
from colorama import Fore, Style

from .constants import TWITCH_OAUTH_URL, TWITCH_API_URL, TWITCH_GQL_URL, TWITCH_GQL_CLIENT_ID


class StreamMonitor:
    """Handles Twitch API interactions for monitoring stream status."""
    
    def __init__(self, username: str):
        """
        Initialize the stream monitor.
        
        Args:
            username: Twitch username to monitor
        """
        self.username = username
        self._oauth_token = None
    
    def get_oauth_token(self) -> str:
        """
        Get OAuth token from Twitch API.
        
        Uses CLIENT-ID and CLIENT-SECRET from environment variables.
        
        Returns:
            str: OAuth access token
            
        Raises:
            SystemExit: If authentication fails
        """
        if self._oauth_token:
            return self._oauth_token
        
        try:
            url = f"{TWITCH_OAUTH_URL}?client_id={os.getenv('CLIENT-ID')}&client_secret={os.getenv('CLIENT-SECRET')}&grant_type=client_credentials"
            response = requests.post(url, timeout=15)
            response.raise_for_status()
            self._oauth_token = response.json()['access_token']
            return self._oauth_token
        except requests.exceptions.RequestException as e:
            print(f'{Fore.RED}✗ ERROR: Failed to authenticate with Twitch API{Style.RESET_ALL}')
            print(f'{Fore.YELLOW}  {str(e)}{Style.RESET_ALL}')
            print(f'{Fore.CYAN}  → Check your CLIENT-ID and CLIENT-SECRET in the .env file{Style.RESET_ALL}')
            sys.exit(1)
        except KeyError:
            print(f'{Fore.RED}✗ ERROR: Invalid response from Twitch API{Style.RESET_ALL}')
            print(f'{Fore.CYAN}  → Verify your CLIENT-ID and CLIENT-SECRET are correct{Style.RESET_ALL}')
            sys.exit(1)
    
    def validate_username(self) -> bool:
        """
        Validate that the configured Twitch username exists.
        
        Returns:
            bool: True if username exists, False otherwise
            
        Raises:
            SystemExit: If username is invalid or doesn't exist
        """
        try:
            url = f'{TWITCH_API_URL}/users?login={self.username}'
            headers = {
                "Authorization": f"Bearer {self.get_oauth_token()}",
                "Client-ID": os.getenv('CLIENT-ID')
            }
            response = requests.get(url, headers=headers, timeout=15)
            response.raise_for_status()
            data = response.json()
            
            if not data.get('data'):
                print(f'{Fore.RED}✗ ERROR: Twitch user "{self.username}" not found{Style.RESET_ALL}')
                print(f'{Fore.CYAN}  → Check the username in your config file{Style.RESET_ALL}')
                sys.exit(1)
                
            print(f'{Fore.GREEN}✓ Username "{self.username}" validated{Style.RESET_ALL}')
            return True
            
        except requests.exceptions.RequestException as e:
            print(f'{Fore.RED}✗ ERROR: Could not validate username{Style.RESET_ALL}')
            print(f'{Fore.YELLOW}  {str(e)}{Style.RESET_ALL}')
            sys.exit(1)
    
    def check_stream_status(self) -> Optional[Dict[str, Any]]:
        """
        Check if the configured user is currently live.
        
        Returns:
            dict: Stream information if live, None if offline
            
        Raises:
            SystemExit: If API request fails
        """
        query = f'query{{user(login: "{self.username}") {{stream{{archiveVideo{{id}}title createdAt}}}}}}'
        
        try:
            response = requests.post(
                TWITCH_GQL_URL,
                json={'query': query},
                headers={"Client-ID": TWITCH_GQL_CLIENT_ID},
                timeout=15
            )
            response.raise_for_status()
            return response.json()
            
        except requests.exceptions.RequestException as e:
            print(f'{Fore.RED}✗ ERROR: Failed to check stream status{Style.RESET_ALL}')
            print(f'{Fore.YELLOW}  {str(e)}{Style.RESET_ALL}')
            sys.exit(1)
    
    def is_user_live(self) -> bool:
        """
        Check if the configured user is currently live.
        
        Returns:
            bool: True if user is live, False if offline
            
        Raises:
            Exception: If API request fails (caller should handle)
        """
        query = f'query{{user(login: "{self.username}") {{stream{{id title}}}}}}'
        
        try:
            response = requests.post(
                TWITCH_GQL_URL,
                json={'query': query},
                headers={"Client-ID": TWITCH_GQL_CLIENT_ID},
                timeout=15
            )
            response.raise_for_status()
            data = response.json()
            stream_data = data.get('data', {}).get('user', {}).get('stream')
            return stream_data is not None
            
        except requests.exceptions.RequestException as e:
            # Don't exit, let caller handle this
            raise Exception(f"Failed to check if user is live: {str(e)}")
    
    def get_latest_vod(self) -> Optional[Dict[str, Any]]:
        """
        Get the most recent VOD for the configured user.
        
        Returns:
            dict: VOD information, or None if no VODs found
        """
        query = f'query {{user(login: "{self.username}") {{videos(first: 1) {{edges {{node {{id title description recordedAt lengthSeconds animatedPreviewURL previewThumbnailURL(height: 1280, width: 720) thumbnailURLs(height: 1280, width: 720)}}}}}}}}}}'
        
        try:
            response = requests.post(
                TWITCH_GQL_URL,
                json={'query': query},
                headers={"Client-ID": TWITCH_GQL_CLIENT_ID},
                timeout=15
            )
            response.raise_for_status()
            return response.json()
            
        except requests.exceptions.RequestException as e:
            print(f'{Fore.YELLOW}⚠ Warning: Could not fetch latest VOD{Style.RESET_ALL}')
            print(f'{Fore.YELLOW}  {str(e)}{Style.RESET_ALL}')
            return None