initial webapp draft

main.py

@@ -0,0 +1,62 @@
+# main.py
+import os
+import shutil
+from fastapi import FastAPI, UploadFile, File, Request
+from fastapi.responses import HTMLResponse
+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
+
+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()
+        },
+    )