# main.py - FastAPI + Jinja2

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from pathlib import Path
from datetime import datetime

from routes import upload, viewer, admin, crop

# -- Middleware ------------------------------------------------
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.requests import Request
from starlette.responses import Response


app = FastAPI(title="PointCloud Frontend")

MAX_UPLOAD_BYTES = 10 * 1024 * 1024 * 1024  # 10 GB à ajuster

class LimitUploadSize(BaseHTTPMiddleware):
    async def dispatch(self, request: Request, call_next):
        if request.method == "POST":
            content_length = request.headers.get("content-length")
            if content_length and int(content_length) > MAX_UPLOAD_BYTES:
                return Response(
                    content=f"Fichier trop volumineux. Maximum : {MAX_UPLOAD_BYTES // (1024**3)} GB",
                    status_code=413,
                )
        return await call_next(request)

app.add_middleware(LimitUploadSize)

# ── Fichiers statiques ────────────────────────────────────────────────────────
app.mount(
    "/static",
    StaticFiles(directory=Path(__file__).parent / "static"),
    name="static",
)

# ── Jinja2 pour les pages et partials ────────────────────────────────────────
templates = Jinja2Templates(directory=Path(__file__).parent / "templates")
templates.env.filters["datetimeformat"] = lambda ts: (
    datetime.fromtimestamp(int(ts)).strftime("%Y-%m-%d %H:%M") if ts else "—"
)

# Rend les templates accessibles aux routes via app.state
app.state.templates = templates

# ── Routes ────────────────────────────────────────────────────────────────────
app.include_router(upload.router)
app.include_router(viewer.router)
app.include_router(admin.router)
app.include_router(crop.router)