import { Router } from "express";
import { z } from "zod";
import { verifyGoogleIdToken } from "../auth/google";
import { clearSession, issueSession } from "../auth/session";
import { requireAuth } from "../auth/middleware";
import { env } from "../env";
import { findActiveEmployeeByEmail, touchEmployeeName } from "../services/employees";
import type { SessionUser } from "../types";

export const authRouter = Router();

const loginSchema = z.object({ credential: z.string().min(1) });

authRouter.post("/google", async (req, res) => {
  const parsed = loginSchema.safeParse(req.body);
  if (!parsed.success) {
    res.status(400).json({ error: "Missing Google credential" });
    return;
  }

  let profile;
  try {
    profile = await verifyGoogleIdToken(parsed.data.credential);
  } catch {
    res.status(401).json({ error: "Invalid Google token" });
    return;
  }

  if (!profile.emailVerified) {
    res.status(403).json({ error: "Google account email is not verified" });
    return;
  }

  const isAdmin = env.adminEmails.includes(profile.email);
  const employee = findActiveEmployeeByEmail(profile.email);

  if (!isAdmin && !employee) {
    res.status(403).json({ error: "This account is not registered as an EatMe employee" });
    return;
  }

  if (employee) {
    touchEmployeeName(employee.id, profile.name);
  }

  const user: SessionUser = {
    email: profile.email,
    name: profile.name,
    role: isAdmin ? "admin" : "employee",
    employeeId: employee?.id ?? null,
  };

  issueSession(res, user);
  res.json({ user });
});

authRouter.post("/logout", (_req, res) => {
  clearSession(res);
  res.status(204).end();
});

authRouter.get("/me", requireAuth, (req, res) => {
  res.json({ user: req.user });
});