import os
import shutil
from fastapi import FastAPI, UploadFile, File, Request, Form
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles

from cost_calculator import allowed_file, analyze_pdf, get_rate_black, get_rate_color, UPLOAD_FOLDER
from mailer import send_order_sync

from dotenv import load_dotenv
load_dotenv()


app = FastAPI()
templates = Jinja2Templates(directory="templates")
os.makedirs(UPLOAD_FOLDER, exist_ok=True)

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


@app.get("/", response_class=HTMLResponse)
async def welcome(request: Request):
    return templates.TemplateResponse("landing.html", {"request": request})


@app.get("/about", response_class=HTMLResponse)
async def about(request: Request):
    return templates.TemplateResponse("about.html", {"request": request})


@app.get("/cost", response_class=HTMLResponse)
async def cost_dashboard(request: Request):
    return templates.TemplateResponse(
        "cost-calculator.html",
        {
            "request": request,
            "rate_black": get_rate_black(),
            "rate_color": get_rate_color(),
        },
    )


@app.post("/upload")
async def upload_file(request: Request, file: UploadFile = File(...)):
    if not allowed_file(file.filename):
        return templates.TemplateResponse(
            "cost-calculator.html",
            {"request": request, "error": "Unsupported file type. Only PDF allowed."},
        )

    path = os.path.join(UPLOAD_FOLDER, file.filename)
    with open(path, "wb") as buffer:
        shutil.copyfileobj(file.file, buffer)

    result = analyze_pdf(path)

    return templates.TemplateResponse(
        "result.html",
        {
            "request": request,
            "result": result,
            "rate_black": get_rate_black(),
            "rate_color": get_rate_color(),
        },
    )


@app.post("/send-order")
def send_order_endpoint(
    request: Request,
    filename: str = Form(...),
    comment: str = Form(""),
):
    """
    Handles the 'Send Order' button. Sends PDF + analysis + user comment via Matrix.
    """
    path = os.path.join(UPLOAD_FOLDER, filename)
    if not os.path.exists(path):
        return templates.TemplateResponse(
            "cost-calculator.html",
            {"request": request, "error": "File not found. Please upload again."},
        )

    analysis = analyze_pdf(path)

    try:
        send_order_sync(path, analysis, room_id="!YokZIMTVFEmSMRmmsb:localhost", comment=comment)
        # Render same result.html but include a success banner
        return templates.TemplateResponse(
            "result.html",
            {
                "request": request,
                "result": analysis,
                "rate_black": get_rate_black(),
                "rate_color": get_rate_color(),
                "success": "✅ Your order has been sent!"
            },
        )
    except Exception as e:
        return templates.TemplateResponse(
            "result.html",
            {
                "request": request,
                "result": analysis,
                "rate_black": get_rate_black(),
                "rate_color": get_rate_color(),
                "error": f"Failed to send order: {e}",
            },
        )