import "jsr:@supabase/functions-js/edge-runtime.d.ts";
import { createClient } from "npm:@supabase/supabase-js@2.116.0";

const PROD_ORIGINS = new Set([
  "https://app.caterium.ru",
  "https://caterium.ru",
  "https://www.caterium.ru",
]);
const WORKERS_DEV_ORIGIN = /^https:\/\/[a-z0-9-]+(?:\.[a-z0-9-]+)*\.workers\.dev$/i;
const LOCAL_ORIGIN = /^http:\/\/(?:localhost|127\.0\.0\.1)(?::\d{1,5})?$/i;
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
const EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
const ALLOWED_ROLES = new Set(["owner", "admin", "manager", "operator", "viewer"]);

function allowedOrigin(origin: string) {
  if (!origin) return true;
  return PROD_ORIGINS.has(origin) || WORKERS_DEV_ORIGIN.test(origin) || LOCAL_ORIGIN.test(origin);
}

function corsHeaders(req: Request) {
  const origin = req.headers.get("Origin") || "";
  const headers: Record<string, string> = {
    "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
    "Access-Control-Allow-Methods": "POST, OPTIONS",
    "Content-Type": "application/json",
    "Vary": "Origin",
  };
  if (origin && allowedOrigin(origin)) headers["Access-Control-Allow-Origin"] = origin;
  return headers;
}

const reply = (req: Request, body: unknown, status = 200) =>
  new Response(JSON.stringify(body), { status, headers: corsHeaders(req) });

type PrepData = {
  status?: string;
  user_id?: string | null;
  email?: string;
  display_name?: string;
  role?: string;
};

function publicError(error: unknown) {
  const message = error instanceof Error ? error.message : String(error || "");
  if (/access denied|permission|not allowed/i.test(message)) return { status: 403, error: "Недостаточно прав для добавления сотрудника.", code: "forbidden" };
  if (/subscription|blocked|plan/i.test(message)) return { status: 403, error: "Добавление сотрудника недоступно для текущего тарифа.", code: "plan_restricted" };
  if (/limit|maximum|max_members/i.test(message)) return { status: 409, error: "Достигнут лимит сотрудников для текущего тарифа.", code: "member_limit" };
  if (/already registered|already exists|duplicate/i.test(message)) return { status: 409, error: "Аккаунт с этим email уже существует.", code: "account_exists" };
  return { status: 500, error: "Не удалось добавить сотрудника. Повторите попытку.", code: "employee_create_failed" };
}

Deno.serve(async (req: Request) => {
  const origin = req.headers.get("Origin") || "";
  if (origin && !allowedOrigin(origin)) return reply(req, { error: "Origin is not allowed", code: "origin_not_allowed" }, 403);
  if (req.method === "OPTIONS") return new Response("ok", { headers: corsHeaders(req) });
  if (req.method !== "POST") return reply(req, { error: "Method not allowed", code: "method_not_allowed" }, 405);

  try {
    const auth = req.headers.get("Authorization") || "";
    if (!/^Bearer\s+\S+/i.test(auth)) return reply(req, { error: "Требуется авторизация.", code: "unauthorized" }, 401);

    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) {
      console.error("[caterium-create-employee] incomplete server auth configuration");
      return reply(req, { error: "Сервис временно недоступен.", code: "server_configuration" }, 503);
    }

    let body: Record<string, unknown>;
    try {
      body = await req.json();
    } catch (_) {
      return reply(req, { error: "Некорректный формат запроса.", code: "invalid_json" }, 400);
    }

    const workspaceId = String(body.workspace_id || "").trim();
    const email = String(body.email || "").trim().toLowerCase();
    const displayName = String(body.display_name || "").trim();
    const role = String(body.role || "manager").trim().toLowerCase();

    if (!UUID_RE.test(workspaceId)) return reply(req, { error: "Некорректная компания.", code: "invalid_workspace" }, 400);
    if (!EMAIL_RE.test(email) || email.length > 254) return reply(req, { error: "Введите корректный email.", code: "invalid_email" }, 400);
    if (displayName.length > 120) return reply(req, { error: "Имя сотрудника слишком длинное.", code: "invalid_display_name" }, 400);
    if (!ALLOWED_ROLES.has(role)) return reply(req, { error: "Некорректная роль сотрудника.", code: "invalid_role" }, 400);

    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 prepare = async () => {
      const result = await caller.rpc("sun_employee_prepare_v28", {
        p_workspace: workspaceId,
        p_email: email,
        p_display_name: displayName,
        p_role: role,
      });
      if (result.error) throw new Error(result.error.message);
      return (result.data || {}) as PrepData;
    };

    const finalize = async (userId: string, created: boolean, temporaryPassword: string | null = null) => {
      const fin = await caller.rpc("sun_employee_finalize_v28", {
        p_workspace: workspaceId,
        p_user_id: userId,
        p_display_name: displayName,
        p_role: role,
      });
      if (fin.error) throw new Error(fin.error.message);
      return reply(req, {
        ...fin.data,
        created,
        temporary_password: temporaryPassword,
        must_change_password: created,
      });
    };

    const prep = await prepare();
    const prepStatus = String(prep.status || "");

    if (prepStatus === "already_member") {
      return reply(req, {
        status: "already_member",
        user_id: prep.user_id,
        email: prep.email || email,
        display_name: prep.display_name || displayName,
        role: prep.role || role,
        created: false,
        temporary_password: null,
        must_change_password: false,
      });
    }

    if (prepStatus === "existing") {
      const existingUserId = String(prep.user_id || "");
      if (!UUID_RE.test(existingUserId)) throw new Error("Existing employee account has no valid user id");
      return await finalize(existingUserId, false, null);
    }

    if (prepStatus !== "new") throw new Error(`Unexpected employee prepare status: ${prepStatus || "empty"}`);

    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) {
      const retryPrep = await prepare();
      const retryStatus = String(retryPrep.status || "");
      if (retryStatus === "already_member") {
        return reply(req, {
          status: "already_member",
          user_id: retryPrep.user_id,
          email: retryPrep.email || email,
          display_name: retryPrep.display_name || displayName,
          role: retryPrep.role || role,
          created: false,
          temporary_password: null,
          must_change_password: false,
        });
      }
      if (retryStatus === "existing" && retryPrep.user_id) return await finalize(String(retryPrep.user_id), false, null);
      throw new Error(created.error?.message || "Employee auth creation failed");
    }

    return await finalize(created.data.user.id, true, password);
  } catch (error) {
    console.error("[caterium-create-employee]", error);
    const safe = publicError(error);
    return reply(req, { error: safe.error, code: safe.code }, safe.status);
  }
});