import os

# Set thread limits to prevent OpenBLAS/MKL deadlock inside FastAPI threads
os.environ["OMP_NUM_THREADS"] = "1"
os.environ["OPENBLAS_NUM_THREADS"] = "1"
os.environ["MKL_NUM_THREADS"] = "1"
os.environ["VECLIB_MAXIMUM_THREADS"] = "1"
os.environ["NUMEXPR_NUM_THREADS"] = "1"

from fastapi import FastAPI, HTTPException, Request, Header
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from pydantic import BaseModel
from typing import List, Optional
import time
import threading
import uuid
import sys
import yfinance as yf
from datetime import datetime
import traceback

try:
    from dotenv import load_dotenv
    load_dotenv()
except ImportError:
    pass

BACKGROUND_TASKS = {}

try:
    from diagnostics import TraceManager
    tracer = TraceManager()
except ImportError:
    tracer = None

try:
    from huggingface_hub import InferenceClient
    has_hf_hub = True
except ImportError:
    has_hf_hub = False

try:
    import core_engine
except ImportError:
    core_engine = None

from config import OUTPUT_DIR
import access_manager

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
STATIC_DIR = os.path.join(BASE_DIR, "static")

app = FastAPI(title="Portfolio Engine API")

# Mount static files
app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")

class AuthRequest(BaseModel):
    key: str

class KeyGenRequest(BaseModel):
    admin_key: str
    new_key: str

class PortfolioRequest(BaseModel):
    tickers: List[str]
    capital: float = 100000.0
    risk_input: int = 5
    model: int = 1
    allocation_engine: int = 1
    allow_shorting: bool = True
    tax_enabled: bool = False
    garch_enabled: bool = True
    custom_constraints: Optional[List[dict]] = None

class ChatHistoryItem(BaseModel):
    role: str
    content: str

class ChatRequest(BaseModel):
    message: str
    history: List[ChatHistoryItem] = []
    portfolio_context: dict



@app.get("/")
async def read_login():
    return FileResponse(os.path.join(STATIC_DIR, "login.html"))

@app.get("/main")
async def read_index():
    return FileResponse(os.path.join(STATIC_DIR, "index.html"))

@app.get("/admin")
async def read_admin():
    return FileResponse(os.path.join(STATIC_DIR, "admin.html"))

# Simple cache for market ticker
ticker_cache = {"timestamp": 0, "data": None}
TICKER_CACHE_TTL = 300  # 5 minutes

@app.get("/api/market_ticker")
async def market_ticker():
    global ticker_cache
    if time.time() - ticker_cache["timestamp"] < TICKER_CACHE_TTL and ticker_cache["data"]:
        return ticker_cache["data"]
    
    symbols = {
        "S&P 500": "^GSPC",
        "NASDAQ": "^IXIC",
        "BTC": "BTC-USD",
        "GOLD": "GC=F",
        "VIX": "^VIX"
    }
    
    results = []
    try:
        # Fetch data for all symbols at once to save time
        tickers = yf.Tickers(" ".join(list(symbols.values())))
        for name, symbol in symbols.items():
            hist = tickers.tickers[symbol].history(period="5d")
            if len(hist) >= 2:
                current = float(hist['Close'].iloc[-1])
                prev = float(hist['Close'].iloc[-2])
                pct_change = ((current - prev) / prev) * 100
                results.append({
                    "name": name,
                    "price": round(current, 2),
                    "change": round(pct_change, 2)
                })
        ticker_cache["data"] = results
        ticker_cache["timestamp"] = time.time()
    except Exception as e:
        # Graceful fallback if yfinance fails
        pass
        
    return results or ticker_cache.get("data", [])

@app.post("/api/auth")
async def api_auth(req: AuthRequest, request: Request):
    forwarded = request.headers.get("X-Forwarded-For")
    ip = forwarded.split(",")[0].strip() if forwarded else (request.client.host if request.client else "Unknown")
    if access_manager.validate_key(req.key, ip):
        return {"status": "success", "message": "Access Granted"}
    raise HTTPException(status_code=401, detail="Invalid or Expired Access Key")

class AdminKeyGenRequest(BaseModel):
    admin_key: str
    hours: int = 1

class AdminRevokeRequest(BaseModel):
    admin_key: str
    target_key: str

@app.post("/api/admin/generate")
async def admin_generate(req: AdminKeyGenRequest):
    new_key = access_manager.generate_otk(req.admin_key, hours=req.hours)
    if new_key:
        return {"status": "success", "key": new_key, "message": f"OTK '{new_key}' created."}
    raise HTTPException(status_code=401, detail="Invalid Admin Key")

@app.post("/api/admin/revoke")
async def admin_revoke(req: AdminRevokeRequest):
    success = access_manager.revoke_otk(req.admin_key, req.target_key)
    if success:
        return {"status": "success", "message": f"Key '{req.target_key}' revoked."}
    raise HTTPException(status_code=401, detail="Invalid Admin Key or Key Not Found")

@app.get("/api/admin/keys")
async def admin_list_keys(admin_key: str = Header(...)):
    keys = access_manager.get_all_keys(admin_key)
    if admin_key != access_manager.MASTER_KEY:
        raise HTTPException(status_code=401, detail="Invalid Admin Key")
    return {"keys": keys}

@app.post("/api/admin/revoke_all")
async def admin_revoke_all(req: AdminRevokeRequest):
    if req.admin_key != access_manager.MASTER_KEY:
        raise HTTPException(status_code=401, detail="Invalid Admin Key")
    keys = access_manager.get_all_keys(req.admin_key)
    count = 0
    for k, v in keys.items():
        if not v.get("revoked", False):
            access_manager.revoke_otk(req.admin_key, k)
            count += 1
    return {"status": "success", "revoked_count": count}

@app.get("/api/admin/logs")
async def admin_get_logs(admin_key: str = Header(...)):
    if admin_key != access_manager.MASTER_KEY:
        raise HTTPException(status_code=401, detail="Invalid Admin Key")
    
    from constants import OUTPUT_DIR
    import os
    from datetime import datetime, timedelta
    
    log_file = os.path.join(OUTPUT_DIR, "access.log")
    logs = []
    if os.path.exists(log_file):
        cutoff = datetime.now() - timedelta(hours=24)
        with open(log_file, "r", encoding="utf-8") as f:
            for line in f:
                if not line.strip(): continue
                # Parse the datetime from the log line (e.g. "2026-06-12 22:33:45,491 - ...")
                try:
                    dt_str = line.split(" - ")[0].split(",")[0]
                    log_dt = datetime.strptime(dt_str, "%Y-%m-%d %H:%M:%S")
                    if log_dt >= cutoff:
                        logs.append(line.strip())
                except:
                    # If parsing fails, just append it
                    logs.append(line.strip())
    
    # Return last 500 lines max to prevent huge payloads
    return {"logs": logs[-500:]}

@app.post("/api/preview")
async def preview_portfolio(req: PortfolioRequest, x_access_key: Optional[str] = Header(None)):
    if not access_manager.validate_key(x_access_key):
        raise HTTPException(status_code=401, detail="Unauthorized")
        
    try:
        overrides = {
            'tickers': req.tickers,
            'capital': req.capital,
            'risk_input': req.risk_input,
            'risk_factor': {1:0.1, 2:0.5, 3:1.0, 4:2.0, 5:3.0, 6:5.0, 7:7.5, 8:10.0, 9:15.0, 10:25.0}.get(req.risk_input, 3.0),
            'model': req.model,
            'allocation_engine': req.allocation_engine,
            'single_asset_min': -1.0 if req.allow_shorting else 0.0,
            'tax_enabled': req.tax_enabled,
            'garch_enabled': req.garch_enabled,
            'custom_constraints': req.custom_constraints
        }
        
        result = core_engine.run_engine(overrides=overrides, serve=False, preview_only=True)
        
        return {
            "status": "success", 
            "target_weights": result.get("target_weights", {}),
            "efficient_frontier": result.get("efficient_frontier", {"vols": [], "rets": []})
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/api/generate")
async def generate_portfolio(req: PortfolioRequest, x_access_key: Optional[str] = Header(None)):
    if not access_manager.validate_key(x_access_key):
        raise HTTPException(status_code=401, detail="Unauthorized")
        
    task_id = str(uuid.uuid4())
    BACKGROUND_TASKS[task_id] = {"status": "running", "message": "Initializing...", "target_weights": {}}

    def _run_optimization(tid, request):
        try:
            overrides = {
                'tickers': request.tickers,
                'capital': request.capital,
                'risk_input': request.risk_input,
                'risk_factor': {1:0.1, 2:0.5, 3:1.0, 4:2.0, 5:3.0, 6:5.0, 7:7.5, 8:10.0, 9:15.0, 10:25.0}.get(request.risk_input, 3.0),
                'model': request.model,
                'allocation_engine': request.allocation_engine,
                'single_asset_min': -1.0 if request.allow_shorting else 0.0,
                'tax_enabled': request.tax_enabled,
                'garch_enabled': request.garch_enabled,
                'custom_constraints': request.custom_constraints
            }
            
            tracer.start_trace(tid)
            tracer.add_flag(tid, "TASK_INIT", f"Target Universe: {overrides.get('universe')}")
            
            # Determine if we are acting as a Proxy (e.g., on Render) or if we should run the math locally.
            is_proxy = os.getenv("RENDER") == "true" or os.getenv("IS_PROXY") == "true"
            is_backend = not is_proxy
            
            if is_backend:
                tracer.add_flag(tid, "BACKEND_START", "Running compute engine locally")
                # We are the backend (either HF or localhost). Run the heavy math.
                result = core_engine.run_engine(overrides=overrides, serve=False, task_id=tid)
                
                tracer.add_flag(tid, "HF_BACKEND_COMPLETE", "Math engine finished")
                BACKGROUND_TASKS[tid]["status"] = "completed"
                BACKGROUND_TASKS[tid]["message"] = "Report generated."
                BACKGROUND_TASKS[tid]["target_weights"] = result.get("target_weights", {})
            else:
                import requests
                hf_url = os.getenv("HF_BACKEND_URL", "https://engineportf-portfolio-opt.hf.space").rstrip('/')
                # Use the master key to bypass HF API restrictions and authenticate internally
                hf_key = os.getenv("HF_MASTER_KEY", "Ir_yad")
                
                tracer.add_flag(tid, "PROXY_START", f"Forwarding to HF backend: {hf_url}")
                try:
                    proxy_res = requests.post(
                        f"{hf_url}/api/generate", 
                        json=request.model_dump() if hasattr(request, 'model_dump') else request.dict(),
                        headers={"X-Access-Key": hf_key},
                        timeout=120
                    )
                except requests.exceptions.Timeout:
                    raise Exception("Hugging Face Backend timed out while queuing the optimization. This is likely due to the free tier spinning up from sleep.")
                except requests.exceptions.RequestException as req_e:
                    raise Exception(f"Hugging Face Backend connection failed: {req_e}")
                
                if not proxy_res.ok:
                    raise Exception(f"Hugging Face Backend Error ({proxy_res.status_code}) at {hf_url}/api/generate. Check HF_BACKEND_URL.")
                
                proxy_data = proxy_res.json()
                remote_task_id = proxy_data.get("task_id")
                tracer.add_flag(tid, "PROXY_HANDOFF_SUCCESS", f"HF Task ID: {remote_task_id}")
                
                if not remote_task_id:
                    raise Exception("Failed to get remote task ID from Hugging Face.")
                
                import time
                retries = 0
                while True:
                    time.sleep(2)
                    try:
                        status_res = requests.get(
                            f"{hf_url}/api/status/{remote_task_id}",
                            headers={"X-Access-Key": hf_key},
                            timeout=15
                        )
                        retries = 0 # Reset on success
                    except requests.exceptions.RequestException as e:
                        retries += 1
                        if retries > 10:
                            tracer.add_flag(tid, "PROXY_POLL_TIMEOUT", f"Poll failed 10 times: {e}")
                            BACKGROUND_TASKS[tid]["status"] = "error"
                            BACKGROUND_TASKS[tid]["message"] = "Hugging Face Backend is unreachable (Timeout). It might have crashed or restarted."
                            break
                        continue
                    
                    if status_res.ok:
                        s_data = status_res.json()
                        BACKGROUND_TASKS[tid]["status"] = s_data["status"]
                        BACKGROUND_TASKS[tid]["message"] = s_data["message"]
                        
                        if s_data["status"] == "completed":
                            BACKGROUND_TASKS[tid]["target_weights"] = s_data.get("target_weights", {})
                            
                            # Download the completed HTML report from HF to Render
                            report_res = requests.get(f"{hf_url}/report")
                            if report_res.ok:
                                report_path = os.path.join(OUTPUT_DIR, "portfolio_report.html")
                                os.makedirs(OUTPUT_DIR, exist_ok=True)
                                with open(report_path, "wb") as f:
                                    f.write(report_res.content)
                            break
                        elif s_data["status"] == "error":
                            error_msg = s_data.get("message", "Unknown error from HF")
                            tracer.add_flag(tid, "PROXY_POLL_ERROR", error_msg)
                            BACKGROUND_TASKS[tid]["status"] = "error"
                            BACKGROUND_TASKS[tid]["message"] = error_msg
                            break
                    else:
                        tracer.add_flag(tid, "PROXY_CONNECTION_LOST", f"Status Code: {status_res.status_code}")
                        retries += 1
                        if retries > 10:
                            BACKGROUND_TASKS[tid]["status"] = "error"
                            BACKGROUND_TASKS[tid]["message"] = f"Lost connection to Hugging Face backend (HTTP {status_res.status_code})."
                            raise Exception(f"Lost connection to Hugging Face backend. (HTTP {status_res.status_code})")
                        continue
                        
        except Exception as e:
            error_trace = traceback.format_exc()
            tracer.add_flag(tid, "FATAL_ERROR", f"{str(e)}\n\nTraceback:\n{error_trace}")
            logger.error(f"Optimization failed: {error_trace}")
            BACKGROUND_TASKS[tid]["status"] = "error"
            BACKGROUND_TASKS[tid]["message"] = f"Error: {str(e)} (Check console logs for details)"
            
    threading.Thread(target=_run_optimization, args=(task_id, req)).start()

    return {
        "status": "queued", 
        "task_id": task_id,
        "message": "Optimization started in background."
    }

@app.post("/api/chat")
async def chat_with_portfolio(req: ChatRequest):
    import logging
    if not has_hf_hub:
        raise HTTPException(status_code=500, detail="huggingface_hub is not installed on the server.")
        
    try:
        hf_token = os.environ.get("HF_TOKEN", "")
        if not hf_token:
            return {"status": "error", "detail": "AI is disabled. Please add 'HF_TOKEN' to your Hugging Face Space Secrets to enable the AI."}
        
        system_prompt = (
            "You are an elite quantitative analyst AI assistant built into the Portfolio Engine. "
            "Your goal is to help the user analyze their portfolio, explain mathematical models, "
            "and act as a highly intelligent conversational partner. "
            "You can answer general finance questions, write python code, or explain concepts simply if asked. "
            "Never give explicit financial advice (e.g. 'You must buy this stock'). "
            "Be helpful, natural, and adapt to the user's tone. "
            "DO NOT blindly recite or summarize the portfolio context unless the user specifically asks a question about their portfolio. "
            "If they just say 'hello' or make a general statement, greet them naturally without mentioning the data."
        )
        
        # Use direct REST API to bypass strict huggingface_hub token scope validation
        import requests
        try:
            from huggingface_hub import InferenceClient
            client = InferenceClient(token=hf_token)
            
            context_str = f"\n\nUser's Current Portfolio Context:\n{req.portfolio_context}" if req.portfolio_context else ""
            
            messages = [
                {"role": "system", "content": system_prompt + context_str}
            ]
            for h in req.history:
                messages.append({"role": h.role, "content": h.content})
            messages.append({"role": "user", "content": req.message})
            response = client.chat_completion(
                messages=messages,
                model="Qwen/Qwen2.5-72B-Instruct",
                max_tokens=2048,
                temperature=0.3
            )
            return {"status": "success", "response": response.choices[0].message.content.strip()}
        except Exception as client_err:
            logging.error(f"InferenceClient failed: {client_err}")
            return {"status": "error", "detail": f"AI temporarily unavailable: {client_err}"}
        
    except Exception as e:
        logging.error(f"AI Chat error: {e}")
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/api/traces")
async def get_all_traces():
    return tracer.traces

@app.get("/api/trace/{task_id}")
async def get_task_trace(task_id: str):
    return {"task_id": task_id, "trace": tracer.get_trace(task_id)}

@app.get("/api/status/{task_id}")
async def get_task_status(task_id: str, x_access_key: Optional[str] = Header(None)):
    if not access_manager.validate_key(x_access_key, silent=True):
        raise HTTPException(status_code=401, detail="Unauthorized")
        
    task = BACKGROUND_TASKS.get(task_id)
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
        
    return task






@app.get("/report")
async def get_report():
    report_path = os.path.join(OUTPUT_DIR, "portfolio_report.html")
    if os.path.exists(report_path):
        return FileResponse(report_path)
    raise HTTPException(status_code=404, detail="Report not generated yet.")

def _alert_daemon():
    """Background daemon to check for market drops."""
    import time
    while True:
        try:
            # Wake up every 1 hour (3600 seconds)
            time.sleep(3600)
            
            # Simple check for SPY drops
            ticker = yf.Ticker("SPY")
            hist = ticker.history(period="2d")
            if len(hist) >= 2:
                current = float(hist['Close'].iloc[-1])
                prev = float(hist['Close'].iloc[-2])
                pct_change = ((current - prev) / prev) * 100
                
                if pct_change <= -5.0:
                    access_manager.send_telegram_alert(f"🚨 **MARKET ALERT**\nSPY has dropped by {pct_change:.2f}%!\nCheck the portfolio engine.")
        except Exception as e:
            pass # Suppress daemon errors

def _keep_alive_daemon():
    """Background daemon to keep the Hugging Face Space awake."""
    import time
    import requests
    while True:
        try:
            # Wake up every 5 minutes (300 seconds)
            time.sleep(300)
            
            # Ping the public URL to keep the load balancer active
            requests.get("https://michaliskoustis2005-byte-portfolio-engine.hf.space/")
        except Exception:
            pass

@app.on_event("startup")
def startup_event():
    import threading
    
    # Start the background alert daemon
    alert_thread = threading.Thread(target=_alert_daemon, daemon=True)
    alert_thread.start()
    
    # Start the keep-alive daemon
    keep_alive_thread = threading.Thread(target=_keep_alive_daemon, daemon=True)
    keep_alive_thread.start()

if __name__ == "__main__":
    import uvicorn
    uvicorn.run("app:app", host="0.0.0.0", port=8000, reload=True)