import os
import subprocess
import shutil
from typing import Optional
from fastapi import FastAPI, UploadFile, HTTPException
from fastapi.responses import JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware
from obs import ObsClient
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

app = FastAPI()

# Configure CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # Allows all origins
    allow_credentials=True,
    allow_methods=["*"],  # Allows all methods
    allow_headers=["*"],  # Allows all headers
)

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

# OBS configuration
ACCESS_KEY = os.getenv('OBS_ACCESS_KEY')
SECRET_KEY = os.getenv('OBS_SECRET_KEY')
ENDPOINT = os.getenv('OBS_ENDPOINT')
BUCKET = os.getenv('OBS_BUCKET')

# File paths
UPLOAD_DIR = "/app/uploads"
PROCESSED_DIR = "/app/processed"

# Ensure directories exist
os.makedirs(UPLOAD_DIR, exist_ok=True)
os.makedirs(PROCESSED_DIR, exist_ok=True)

def get_obs_client() -> ObsClient:
    return ObsClient(
        access_key_id=ACCESS_KEY,
        secret_access_key=SECRET_KEY,
        server=ENDPOINT
    )

@app.get("/")
async def root():
    return FileResponse("static/index.html")

@app.post("/convert")
async def convert_eps_to_svg(file: UploadFile):
    # Check file size (10MB limit)
    file_size = 0
    content = await file.read()
    file_size = len(content)
    if file_size > 10 * 1024 * 1024:  # 10MB
        raise HTTPException(status_code=400, detail="File too large. Maximum size is 10MB")
    
    # Check file extension
    if not file.filename.lower().endswith('.eps'):
        raise HTTPException(status_code=400, detail="Only EPS files are accepted")
    
    try:
        # Ensure directories exist and are writable
        for directory in [UPLOAD_DIR, PROCESSED_DIR]:
            if not os.path.exists(directory):
                os.makedirs(directory, exist_ok=True)
            if not os.access(directory, os.W_OK):
                raise HTTPException(status_code=500, detail=f"Directory {directory} is not writable")

        # Save uploaded file
        input_path = os.path.join(UPLOAD_DIR, file.filename)
        with open(input_path, "wb") as f:
            f.write(content)
        
        # Generate output paths
        base_name = os.path.splitext(file.filename)[0]
        temp_svg = os.path.join(PROCESSED_DIR, f"{base_name}_temp.svg")
        final_svg = os.path.join(PROCESSED_DIR, f"{base_name}.svg")
        
        # Convert EPS to SVG
        try:
            subprocess.run(['eps2svg', input_path, temp_svg], check=True, capture_output=True, text=True)
        except subprocess.CalledProcessError as e:
            raise HTTPException(status_code=500, detail=f"eps2svg conversion failed: {e.stderr}")
        
        # Check if temp_svg was created
        if not os.path.exists(temp_svg):
            raise HTTPException(status_code=500, detail="eps2svg failed to create output file")
        
        # Try to optimize SVG using scour
        try:
            subprocess.run(['scour', '-i', temp_svg, '-o', final_svg], check=True)
        except subprocess.CalledProcessError:
            # If scour fails, use the unoptimized SVG
            shutil.copy(temp_svg, final_svg)
            print("Scour optimization failed, using unoptimized SVG")
        
        # Upload to OBS
        obs_client = get_obs_client()
        obs_key = f"svg/{base_name}.svg"
        
        with open(final_svg, 'rb') as f:
            obs_client.putContent(BUCKET, obs_key, f.read())
        
        # Clean up files
        os.remove(input_path)
        os.remove(temp_svg)
        os.remove(final_svg)
        
        return JSONResponse({
            "status": "success",
            "message": "File processed successfully",
            "obs_key": obs_key
        })
        
    except subprocess.CalledProcessError as e:
        raise HTTPException(status_code=500, detail=f"Error processing file: {str(e)}")
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@app.get("/health")
def health_check():
    return {"status": "healthy"}