import os
import json
import time
import threading
from fastapi import FastAPI, HTTPException, BackgroundTasks
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
import uvicorn
from typing import Dict
from pathlib import Path
from datetime import datetime
from fastapi.responses import FileResponse

# Import from cursor_tracker
from cursor_tracker import (
    main_processing_loop,
    processing_status,
    CURSOR_TRACKING_OUTPUT_FOLDER,
    CURSOR_TEMPLATES_DIR,
    log_message
)



# FastAPI App Definition
app = FastAPI(title="Cursor Tracking API", description="API to access cursor tracking results", version="1.0.0")

# Add CORS middleware to allow cross-origin requests
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # Allows all origins
    allow_credentials=True,
    allow_methods=["*"],  # Allows all methods
    allow_headers=["*"],
)

# Global variable to track if processing is running
processing_thread = None

def log_message(message):
    """Add a log message with timestamp"""
    timestamp = datetime.now().strftime("%H:%M:%S")
    log_entry = f"[{timestamp}] {message}"
    processing_status["logs"].append(log_entry)
    
    # Keep only the last 100 logs
    if len(processing_status["logs"]) > 100:
        processing_status["logs"] = processing_status["logs"][-100:]
    
    print(log_entry)

@app.on_event("startup")
async def startup_event():
    """Run the processing loop in the background when the API starts"""
    global processing_thread
    if not (processing_thread and processing_thread.is_alive()):
        log_message("🚀 Starting RAR extraction, frame extraction, and cursor tracking pipeline in background...")
        processing_thread = threading.Thread(target=main_processing_loop)
        processing_thread.daemon = True
        processing_thread.start()

from fastapi.staticfiles import StaticFiles

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

# Serve your main HTML file
@app.get("/")
async def root():
    return ()
    
    # return FileResponse("index.html")

# # Optional: If you need to serve other static files individually
# @app.get("/{filename}")
# async def serve_file(filename: str):
#     if filename in ['style.css', 'script.js']:
#         return FileResponse(f"static/{filename}")
#     return FileResponse(f"static/{filename}")



@app.get("/status")
async def get_status():
    """Get current processing status"""
    return {
        "processing_status": processing_status,
        "cursor_tracking_folder": CURSOR_TRACKING_OUTPUT_FOLDER,
        "folder_exists": os.path.exists(CURSOR_TRACKING_OUTPUT_FOLDER)
    }

@app.get("/cursor-data")
async def list_cursor_data():
    """List all available cursor tracking JSON files"""
    if not os.path.exists(CURSOR_TRACKING_OUTPUT_FOLDER):
        return {"files": [], "message": "Cursor tracking output folder does not exist yet"}
    
    json_files = []
    for file in os.listdir(CURSOR_TRACKING_OUTPUT_FOLDER):
        if file.endswith(".json"):
            file_path = os.path.join(CURSOR_TRACKING_OUTPUT_FOLDER, file)
            file_stats = os.stat(file_path)
            json_files.append({
                "filename": file,
                "size_bytes": file_stats.st_size,
                "modified_time": time.ctime(file_stats.st_mtime),
                "download_url": f"/cursor-data/{file}"
            })
    
    return {
        "files": json_files,
        "total_files": len(json_files),
        "folder_path": CURSOR_TRACKING_OUTPUT_FOLDER
    }

from fastapi.encoders import jsonable_encoder

def get_disk_usage(path: str) -> Dict[str, float]:
    """Get disk usage statistics in GB"""
    statvfs = os.statvfs(path)
    total = statvfs.f_frsize * statvfs.f_blocks / (1024**3)
    free = statvfs.f_frsize * statvfs.f_bavail / (1024**3)
    used = total - free
    return {"total": total, "free": free, "used": used}

class SafeJSONEncoder(json.JSONEncoder):
    def default(self, obj):
        try:
            if isinstance(obj, float):
                if obj != obj:  # Check for NaN
                    return None
                if obj == float('inf') or obj == float('-inf'):
                    return None
            return super().default(obj)
        except:
            return None

@app.get("/cursor-data/{filename}")
async def get_cursor_data(filename: str):
    """Get specific cursor tracking data by filename"""
    if not filename.endswith(".json"):
        raise HTTPException(status_code=400, detail="File must be a JSON file")
    
    file_path = os.path.join(CURSOR_TRACKING_OUTPUT_FOLDER, filename)
    
    if not os.path.exists(file_path):
        raise HTTPException(status_code=404, detail=f"File {filename} not found")
    
    try:
        with open(file_path, "r") as f:
            data = json.load(f)
        
        # Clean the data of any NaN or infinity values
        def clean_floats(obj):
            if isinstance(obj, float):
                if obj != obj:  # NaN
                    return None
                if obj == float('inf') or obj == float('-inf'):
                    return None
                return obj
            elif isinstance(obj, dict):
                return {k: clean_floats(v) for k, v in obj.items()}
            elif isinstance(obj, list):
                return [clean_floats(v) for v in obj]
            return obj
        
        cleaned_data = clean_floats(data)
        
        # Add metadata
        file_stats = os.stat(file_path)
        response_data = {
            "filename": filename,
            "file_size_bytes": file_stats.st_size,
            "modified_time": time.ctime(file_stats.st_mtime),
            "total_frames": len(cleaned_data),
            "cursor_active_frames": len([frame for frame in cleaned_data if frame.get("cursor_active", False)]),
            "data": cleaned_data
        }
        
        return JSONResponse(content=jsonable_encoder(response_data))
        
    except json.JSONDecodeError:
        raise HTTPException(status_code=500, detail=f"Invalid JSON in file {filename}")
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error reading file {filename}: {str(e)}")

@app.post("/start-processing")
async def start_processing(background_tasks: BackgroundTasks, start_index: int = 0):
    """Start the RAR processing pipeline in the background"""
    global processing_thread
    
    if processing_thread and processing_thread.is_alive():
        return {"message": "Processing is already running", "status": "already_running"}
    
    if processing_status["is_running"]:
        return {"message": "Processing is already running", "status": "already_running"}
    
    # Start processing in a background thread
    processing_thread = threading.Thread(target=main_processing_loop, args=(start_index,))
    processing_thread.daemon = True
    processing_thread.start()
    
    return {"message": f"Processing started in background from index {start_index}", "status": "started"}

@app.post("/stop-processing")
async def stop_processing():
    """Stop the RAR processing pipeline"""
    global processing_thread
    
    if not processing_status["is_running"] and (not processing_thread or not processing_thread.is_alive()):
        return {"message": "No processing is currently running", "status": "not_running"}
    
    # Note: This is a graceful stop request. The actual stopping depends on the processing loop
    # checking the processing_status["is_running"] flag
    processing_status["is_running"] = False
    
    return {"message": "Stop signal sent to processing pipeline", "status": "stop_requested"}

@app.get("/cursor-data/{filename}/summary")
async def get_cursor_data_summary(filename: str):
    """Get a summary of cursor tracking data without the full frame data"""
    if not filename.endswith(".json"):
        raise HTTPException(status_code=400, detail="File must be a JSON file")
    
    file_path = os.path.join(CURSOR_TRACKING_OUTPUT_FOLDER, filename)
    
    if not os.path.exists(file_path):
        raise HTTPException(status_code=404, detail=f"File {filename} not found")
    
    try:
        with open(file_path, "r") as f:
            data = json.load(f)
        
        # Clean the data first
        def clean_floats(obj):
            if isinstance(obj, float):
                if obj != obj:  # NaN
                    return None
                if obj == float('inf') or obj == float('-inf'):
                    return None
                return obj
            elif isinstance(obj, dict):
                return {k: clean_floats(v) for k, v in obj.items()}
            elif isinstance(obj, list):
                return [clean_floats(v) for v in obj]
            return obj
        
        cleaned_data = clean_floats(data)
        
        # Calculate summary statistics
        total_frames = len(cleaned_data)
        cursor_active_frames = len([frame for frame in cleaned_data if frame.get("cursor_active", False)])
        cursor_inactive_frames = total_frames - cursor_active_frames
        
        # Get unique templates used
        templates_used = set()
        confidence_scores = []
        
        for frame in cleaned_data:
            if frame.get("cursor_active", False) and frame.get("template"):
                templates_used.add(frame["template"])
                if frame.get("confidence") is not None:
                    # Ensure confidence is a valid number
                    try:
                        conf = float(frame["confidence"])
                        if not (conf != conf or conf == float('inf') or conf == float('-inf')):
                            confidence_scores.append(conf)
                    except (ValueError, TypeError):
                        pass
        
        # Calculate confidence statistics
        avg_confidence = sum(confidence_scores) / len(confidence_scores) if confidence_scores else 0
        max_confidence = max(confidence_scores) if confidence_scores else 0
        min_confidence = min(confidence_scores) if confidence_scores else 0
        
        file_stats = os.stat(file_path)
        
        summary = {
            "filename": filename,
            "file_size_bytes": file_stats.st_size,
            "modified_time": time.ctime(file_stats.st_mtime),
            "total_frames": total_frames,
            "cursor_active_frames": cursor_active_frames,
            "cursor_inactive_frames": cursor_inactive_frames,
            "cursor_detection_rate": cursor_active_frames / total_frames if total_frames > 0 else 0,
            "templates_used": list(templates_used),
            "confidence_stats": {
                "average": avg_confidence,
                "maximum": max_confidence,
                "minimum": min_confidence,
                "total_measurements": len(confidence_scores)
            }
        }
        
        return JSONResponse(content=jsonable_encoder(summary))
        
    except json.JSONDecodeError:
        raise HTTPException(status_code=500, detail=f"Invalid JSON in file {filename}")
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error reading file {filename}: {str(e)}")

if __name__ == "__main__":
    # Start the FastAPI server
    print("Starting Cursor Tracking FastAPI Server...")
    print("API Documentation will be available at: http://localhost:8000/docs")
    print("API Root endpoint: http://localhost:8000/")
    
    # Ensure the cursor tracking output folder exists
    os.makedirs(CURSOR_TRACKING_OUTPUT_FOLDER, exist_ok=True)
    
    uvicorn.run(
        app, 
        host="0.0.0.0", 
        port=8000, 
        log_level="info",
        reload=False  # Set to False for production
    )