import "jsr:@supabase/functions-js/edge-runtime.d.ts";
import { createClient } from "npm:@supabase/supabase-js@2";

const cors = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
  "Access-Control-Allow-Methods": "POST, OPTIONS",
  "Content-Type": "application/json",
};
const reply = (body: unknown, status = 200) => new Response(JSON.stringify(body), { status, headers: cors });

Deno.serve(async (req: Request) => {
  if (req.method === "OPTIONS") return new Response("ok", { headers: cors });
  if (req.method !== "POST") return reply({ error: "Method not allowed" }, 405);
  try {
    const auth = req.headers.get("Authorization") || "";
    const url = Deno.env.get("SUPABASE_URL") || "";
    const anon = Deno.env.get("SUPABASE_ANON_KEY") || "";
    const serviceKey = Deno.env.get("SUPABASE_SERVICE_ROLE_KEY") || "";
    if (!url || !anon || !serviceKey) return reply({ error: "Server auth configuration is incomplete" }, 500);
    const caller = createClient(url, anon, {
      global: { headers: { Authorization: auth } },
      auth: { persistSession: false, autoRefreshToken: false },
    });
    const service = createClient(url, serviceKey, { auth: { persistSession: false, autoRefreshToken: false } });
    const body = await req.json();
    const workspaceId = String(body.workspace_id || "");
    const email = String(body.email || "").trim().toLowerCase();
    const displayName = String(body.display_name || "").trim();
    const role = String(body.role || "manager");
    const prep = await caller.rpc("sun_employee_prepare_v28", {
      p_workspace: workspaceId,
      p_email: email,
      p_display_name: displayName,
      p_role: role,
    });
    if (prep.error) return reply({ error: prep.error.message }, 400);
    if (prep.data?.status !== "new") {
      return reply({ status: prep.data?.status, user_id: prep.data?.user_id, email, display_name: displayName, role }, 200);
    }
    const alphabet = "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz23456789";
    const bytes = crypto.getRandomValues(new Uint8Array(12));
    let password = "";
    for (const b of bytes) password += alphabet[b % alphabet.length];
    password = password.slice(0, 6) + "-" + password.slice(6);
    const created = await service.auth.admin.createUser({
      email,
      password,
      email_confirm: true,
      user_metadata: {
        name: displayName || email.split("@")[0],
        must_change_password: true,
        registration_source: "caterium_employee_admin",
      },
    });
    if (created.error || !created.data.user) return reply({ error: created.error?.message || "Create failed" }, 400);
    const fin = await caller.rpc("sun_employee_finalize_v28", {
      p_workspace: workspaceId,
      p_user_id: created.data.user.id,
      p_display_name: displayName,
      p_role: role,
    });
    if (fin.error) return reply({ error: fin.error.message }, 400);
    return reply({ ...fin.data, created: true, temporary_password: password, must_change_password: true });
  } catch (e) {
    return reply({ error: e instanceof Error ? e.message : String(e) }, 500);
  }
});