import os
import random
import json
import time
from pathlib import Path
from typing import Dict, Optional, List

# Hardcoded Default Pool
DEFAULT_POOL = [
    "http://Z9M25R:0QHP8X@206.168.90.60:50100",
    "http://Z9M25R:0QHP8X@206.168.88.98:50100"
]

class ProxyManager:
    """
    Manages proxy rotation and configuration for the V16 Pipeline.
    Reads from version16/pipeline_settings.json for configuration.
    """
    
    def __init__(self):
        self.settings = self._load_settings()
        self.proxy_config = self.settings.get("proxy", {})
        
        self.enabled = self.proxy_config.get("use_proxy", True)
        self.method = self.proxy_config.get("pool_method", "only_pool")
        self.rotation = self.proxy_config.get("rotation_strategy", "sequential")
        self.custom_proxies = self.proxy_config.get("custom_proxies", [])
        
        self._pool = self._build_pool()
        self._current_index = 0
        
        # Check environment override (Highest Priority)
        if os.environ.get("WCS_FORCE_PROXY"):
            self._pool = [os.environ["WCS_FORCE_PROXY"]]

    def _load_settings(self) -> dict:
        """Attempts to find and load pipeline_settings.json"""
        try:
            # 1. Look in version16 sibling directory (High Priority)
            current = Path(__file__).parent
            v16_settings = current.parent / "version16" / "pipeline_settings.json"
            
            if v16_settings.exists():
                with open(v16_settings, 'r', encoding='utf-8') as f:
                    return json.load(f)
            
            # 2. Look in version15/14/13 (Legacy Fallback)
            for v in ["version15", "version14", "version13"]:
                settings = current.parent / v / "pipeline_settings.json"
                if settings.exists():
                    with open(settings, 'r', encoding='utf-8') as f:
                        return json.load(f)

            # 3. Fallback: check current directory
            if Path("pipeline_settings.json").exists():
                with open("pipeline_settings.json", 'r', encoding='utf-8') as f:
                    return json.load(f)
                    
            return {}
        except Exception:
            return {}

    def _build_pool(self) -> List[str]:
        """Constructs the active proxy pool based on settings."""
        if not self.enabled:
            return []
            
        pool = []
        
        # 1. Add Default Pool
        if self.method in ["only_pool", "pool_plus_mine"]:
            pool.extend(DEFAULT_POOL)
            
        # 2. Add Custom Proxies
        if self.method in ["only_mine", "pool_plus_mine"]:
            if self.custom_proxies:
                pool.extend(self.custom_proxies)
        
        # Safety fallback
        if not pool and self.enabled:
             # print("⚠️  Proxy checks enabled but pool is empty! Using default fallback.")
             pool.extend(DEFAULT_POOL)
             
        return pool

    def get_proxy(self) -> Optional[str]:
        """Get the current or next proxy string."""
        if not self.enabled or not self._pool:
            return None
            
        if self.rotation == "random":
            return random.choice(self._pool)
        else:
            # Sequential
            proxy = self._pool[self._current_index % len(self._pool)]
            self._current_index += 1
            return proxy

    def get_playwright_proxy(self) -> Optional[Dict]:
        """Returns Playwright proxy dictionary or None."""
        proxy_str = self.get_proxy()
        
        if not proxy_str:
            return None
        
        parse_result = {}
        if "@" in proxy_str:
             # PROTOCOL://USER:PASS@IP:PORT
            try:
                protocol_auth, address = proxy_str.split("@")
                if "://" in protocol_auth:
                    protocol, auth = protocol_auth.split("://")
                else:
                    protocol = "http" # Default
                    auth = protocol_auth
                    
                username, password = auth.split(":")
                
                parse_result = {
                    "server": f"{protocol}://{address}",
                    "username": username,
                    "password": password
                }
            except:
                 # Parse fail fallback
                 parse_result = {"server": proxy_str}
        else:
            parse_result = {"server": proxy_str}
            
        return parse_result
        
    @staticmethod
    def inject_env():
        """
        Injects proxy settings into WCS environment variables.
        Called by Pipeline S0.
        """
        manager = ProxyManager()
        proxy = manager.get_proxy()
        
        # V16: Track failure count if needed (future)
        # For now, we just return the next one in the pool
        
        if proxy:
            safe_ip = proxy.split('@')[-1] if '@' in proxy else proxy
            print(f"🔒 Proxy Manager: Active Proxy -> {safe_ip}")
            print(f"   [Method: {manager.method} | Rotation: {manager.rotation}]")
            os.environ["WCS_TARGET_PROXY"] = proxy
            return proxy
        else:
            print("🔓 Proxy Manager: DIRECT MODE (No Proxy)")
            if "WCS_TARGET_PROXY" in os.environ:
                del os.environ["WCS_TARGET_PROXY"]
            return "DIRECT"