# main.py
from fastapi import FastAPI, UploadFile, File, Form, Request
from fastapi.responses import HTMLResponse, JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from fastapi.middleware.cors import CORSMiddleware
import tempfile, os

from app import summarize_document
from appImage import caption_image

app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.mount("/static", StaticFiles(directory="static"), name="static")
app.mount("/resources", StaticFiles(directory="resources"), name="resources")
templates = Jinja2Templates(directory="templates")

# Serve homepage
@app.get("/", response_class=HTMLResponse)
async def serve_home(request: Request):
    return templates.TemplateResponse("HomeS.html", {"request": request})

# Document summarization endpoint
@app.post("/summarize/")
async def summarize_api(file: UploadFile = File(...), length: str = Form("medium")):
    try:
        contents = await file.read()
        with tempfile.NamedTemporaryFile(delete=False) as tmp_file:
            tmp_file.write(contents)
            tmp_path = tmp_file.name

        file_ext = tmp_path.split('.')[-1].lower()
        text, error = extract_text(tmp_path, file_ext)

        if error:
            return JSONResponse({"detail": error}, status_code=400)

        if not text or len(text.split()) < 30:
            return JSONResponse({"detail": "Document too short to summarize"}, status_code=400)

        summary = generate_summary(text, length)
        audio_path = text_to_speech(summary)
        pdf_path = create_pdf(summary, file.filename)

        response = {"summary": summary}
        if audio_path:
            response["audioUrl"] = f"/files/{os.path.basename(audio_path)}"
        if pdf_path:
            response["pdfUrl"] = f"/files/{os.path.basename(pdf_path)}"

        return JSONResponse(response)

    except Exception as e:
        print(f"Error during summarization: {str(e)}")  # << SUPER IMPORTANT FOR DEBUG
        return JSONResponse({"detail": f"Internal server error: {str(e)}"}, status_code=500)


# Image captioning endpoint
@app.post("/imagecaption/")
async def caption(file: UploadFile = File(...)):
    try:
        result = await caption_image(file)
        return JSONResponse(result)
    except Exception as e:
        return JSONResponse({"error": f"Image captioning failed: {str(e)}"}, status_code=500)

# Serve audio/pdf generated
@app.get("/files/{filename}")
async def serve_file(filename: str):
    filepath = os.path.join(tempfile.gettempdir(), filename)
    if os.path.exists(filepath):
        return FileResponse(filepath)
    return JSONResponse({"error": "File not found"}, status_code=404)