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from fastapi import FastAPI, File, UploadFile, Form, HTTPException
from fastapi.responses import FileResponse, HTMLResponse
from fastapi.middleware.cors import CORSMiddleware
from fastapi import BackgroundTasks
import os
import tempfile
import re
import json
from pathlib import Path

# Import your conversion function from meta.py
from meta import process_excel_to_word

app = FastAPI(title="QCM Converter API - META")

# Enable CORS for all origins (you can restrict this in production)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

def validate_hex_color(color: str) -> bool:
    """Validate hex color format"""
    pattern = r'^[0-9A-Fa-f]{6}$'
    return bool(re.match(pattern, color))

@app.get("/", response_class=HTMLResponse)
async def root():
    """Serve the HTML interface"""
    html_path = Path(__file__).parent / "index.html"
    if html_path.exists():
        return html_path.read_text()
    return """
    <html>
        <body>
            <h1>QCM Converter API - META</h1>
            <p>META Version: Answer tables only at the end of each module</p>
            <p>Upload your Excel files at <a href="/docs">/docs</a></p>
        </body>
    </html>
    """

@app.post("/convert")
async def convert_file(
    background_tasks: BackgroundTasks,
    file: UploadFile = File(...),
    images: UploadFile = File(None),  # Optional ZIP file with images
    use_two_columns: bool = Form(True),
    add_separator_line: bool = Form(True),
    theme_color: str = Form("5FFFDF"),
    highlight_words: str = Form(None)  # JSON string of words to highlight
):
    """
    Convert Excel QCM file to Word document (META version)
    
    META Version Features:
    - NO empty tables after each course
    - ONLY answer tables at the end of each module
    
    Parameters:
    - file: Excel file (.xlsx)
    - images: Optional ZIP file containing images
    - use_two_columns: Use two-column layout
    - add_separator_line: Add separator line between columns
    - theme_color: Hex color code (without #) e.g., "5FFFDF"
    - highlight_words: JSON array of words to highlight (e.g., '["word1", "word2"]')
    """
    
    # Validate file extension
    if not file.filename.endswith('.xlsx'):
        raise HTTPException(status_code=400, detail="Only .xlsx files are supported")
    
    # Validate color
    if not validate_hex_color(theme_color):
        raise HTTPException(
            status_code=400, 
            detail="Invalid color format. Use 6-character hex code (e.g., '5FFFDF')"
        )
    
    original_name = Path(file.filename).stem
    temp_dir = tempfile.mkdtemp()
    temp_input_path = os.path.join(temp_dir, f"{original_name}.xlsx")
    
    # Save the Excel file
    with open(temp_input_path, "wb") as f:
        f.write(await file.read())

    # Handle optional image ZIP file
    temp_images_path = None
    if images and images.filename:
        if not images.filename.endswith('.zip'):
            cleanup_files(temp_input_path)
            raise HTTPException(status_code=400, detail="Images must be in a ZIP file")
        
        temp_images_path = os.path.join(temp_dir, "images.zip")
        with open(temp_images_path, "wb") as f:
            f.write(await images.read())

    output_filename = file.filename.replace('.xlsx', '_converted.docx')
    temp_output_path = tempfile.mktemp(suffix='.docx')

    # Parse highlight words from JSON string
    highlight_words_list = []
    if highlight_words:
        try:
            highlight_words_list = json.loads(highlight_words)
            if not isinstance(highlight_words_list, list):
                highlight_words_list = []
        except json.JSONDecodeError:
            # If it's not valid JSON, treat it as empty list
            highlight_words_list = []

    try:
        process_excel_to_word(
            excel_file_path=temp_input_path,
            output_word_path=temp_output_path,
            image_folder=temp_images_path,  # Can be None
            display_name=None,
            use_two_columns=use_two_columns,
            add_separator_line=add_separator_line,
            balance_method="dynamic",
            theme_hex=theme_color,
            highlight_words=highlight_words_list
        )

        # Schedule cleanup as a background task
        files_to_cleanup = [temp_input_path, temp_output_path]
        if temp_images_path:
            files_to_cleanup.append(temp_images_path)
        
        background_tasks.add_task(cleanup_files, *files_to_cleanup)

        return FileResponse(
            temp_output_path,
            media_type="application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            filename=output_filename,
            background=None
        )

    except Exception as e:
        files_to_cleanup = [temp_input_path, temp_output_path]
        if temp_images_path:
            files_to_cleanup.append(temp_images_path)
        cleanup_files(*files_to_cleanup)
        raise HTTPException(status_code=500, detail=f"Conversion failed: {str(e)}")

def cleanup_files(*file_paths):
    """Clean up temporary files"""
    for file_path in file_paths:
        try:
            if os.path.exists(file_path):
                os.unlink(file_path)
        except Exception as e:
            print(f"Error cleaning up {file_path}: {e}")

@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "healthy", "message": "QCM Converter API - META is running"}

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)