(async function () {
  const root = document.getElementById("app");
  const user = await bootstrapAuth({ requireAuth: true, forbidIfMustChange: true });
  if (!user) return;

  const state = { competitions: [], users: [] };

  async function loadCompetitions() {
    state.competitions = await API.listCompetitions();
  }
  async function loadUsers() {
    if (user.is_system_admin) state.users = await API.listUsers();
  }

  function openCompetitionModal() {
    const backdrop = el("div", { class: "modal-backdrop",
      onclick: (e) => { if (e.target === backdrop) backdrop.remove(); } });
    const nameInput = el("input", { type: "text" });
    const allowInput = el("input", { type: "checkbox" });
    backdrop.appendChild(el("div", { class: "modal" },
      el("h3", null, t("new_competition")),
      el("div", { class: "field" }, el("label", null, t("competition_name")), nameInput),
      el("label", { class: "row" }, allowInput, " " + t("allow_any_scorer_edit")),
      el("div", { class: "row", style: { justifyContent: "flex-end", marginTop: "1rem" } },
        el("button", { onclick: () => backdrop.remove() }, t("cancel")),
        el("button", { class: "primary", onclick: async () => {
          if (!nameInput.value.trim()) return;
          try {
            await API.createCompetition({ name: nameInput.value.trim(), allow_any_scorer_edit: allowInput.checked });
            backdrop.remove();
            await loadCompetitions();
            render();
          } catch (e) { alert(e.message); }
        } }, t("create")),
      ),
    ));
    document.body.appendChild(backdrop);
  }

  function openUserModal() {
    const backdrop = el("div", { class: "modal-backdrop",
      onclick: (e) => { if (e.target === backdrop) backdrop.remove(); } });
    const username = el("input", { type: "text",
      oninput: (e) => { e.target.value = e.target.value.toLowerCase(); } });
    const password = el("input", { type: "password" });
    const displayName = el("input", { type: "text" });
    const langSelect = el("select", null,
      ...I18N_AVAILABLE.map((l) => el("option", { value: l }, I18N_NAMES[l]))
    );
    const isAdmin = el("input", { type: "checkbox" });
    backdrop.appendChild(el("div", { class: "modal" },
      el("h3", null, t("add_user")),
      el("div", { class: "field" }, el("label", null, t("username")), username),
      el("div", { class: "field" }, el("label", null, t("password")), password),
      el("div", { class: "field" }, el("label", null, t("display_name")), displayName),
      el("div", { class: "field" }, el("label", null, t("language")), langSelect),
      el("label", { class: "row" }, isAdmin, " " + t("is_admin")),
      el("div", { class: "row", style: { justifyContent: "flex-end", marginTop: "1rem" } },
        el("button", { onclick: () => backdrop.remove() }, t("cancel")),
        el("button", { class: "primary", onclick: async () => {
          if (!username.value.trim() || !password.value) return;
          try {
            await API.createUser({
              username: username.value.trim().toLowerCase(),
              password: password.value,
              display_name: displayName.value,
              language: langSelect.value,
              is_system_admin: isAdmin.checked,
            });
            backdrop.remove();
            await loadUsers();
            render();
          } catch (err) { alert(err.message); }
        } }, t("create")),
      ),
    ));
    document.body.appendChild(backdrop);
  }

  function renderUsersAdmin() {
    const card = el("div", { class: "card" });
    card.appendChild(el("div", { class: "row", style: { justifyContent: "space-between", marginBottom: "0.5rem" } },
      el("h2", { style: { margin: 0 } }, t("users")),
      el("button", { onclick: openUserModal }, t("add_user")),
    ));
    if (state.users.length === 0) {
      card.appendChild(el("div", { class: "muted" }, "—"));
      return card;
    }
    const table = el("table");
    table.appendChild(el("thead", null,
      el("tr", null,
        el("th", null, t("username")),
        el("th", null, t("display_name")),
        el("th", null, t("language")),
        el("th", null, t("is_admin")),
        el("th", null, t("must_change_password")),
        el("th", null, t("actions")),
      )
    ));
    const tbody = el("tbody");
    for (const u of state.users) {
      const row = el("tr", null,
        el("td", null, u.username),
        el("td", null, u.display_name),
        el("td", null, I18N_NAMES[u.language] || u.language),
        el("td", null, u.is_system_admin ? t("yes") : t("no")),
        el("td", null, u.must_change_password ? el("span", { class: "badge warn" }, t("yes")) : t("no")),
        el("td", null,
          el("button", { class: "action-btn", onclick: () => openEditUserModal(u) }, t("edit")),
          !u.must_change_password && el("button", { class: "action-btn", onclick: async () => {
            if (!confirm(t("confirm_force_password"))) return;
            await API.updateUser(u.id, { must_change_password: true });
            await loadUsers();
            render();
          } }, t("force_password_change")),
          u.id !== user.id && el("button", { class: "action-btn danger", onclick: async () => {
            if (!confirm(t("confirm_delete"))) return;
            await API.deleteUser(u.id);
            await loadUsers();
            render();
          } }, t("delete")),
        ),
      );
      tbody.appendChild(row);
    }
    table.appendChild(tbody);
    card.appendChild(el("div", { class: "table-wrap" }, table));
    return card;
  }

  function openEditUserModal(u) {
    const backdrop = el("div", { class: "modal-backdrop",
      onclick: (e) => { if (e.target === backdrop) backdrop.remove(); } });
    const username = el("input", { type: "text", value: u.username,
      oninput: (e) => { e.target.value = e.target.value.toLowerCase(); } });
    const displayName = el("input", { type: "text", value: u.display_name || "" });
    const password = el("input", { type: "password", placeholder: t("leave_blank_keep") });
    const isAdmin = el("input", { type: "checkbox", checked: !!u.is_system_admin });
    backdrop.appendChild(el("div", { class: "modal" },
      el("h3", null, t("edit") + ": " + u.username),
      el("div", { class: "field" }, el("label", null, t("username")), username),
      el("div", { class: "field" }, el("label", null, t("display_name")), displayName),
      el("div", { class: "field" }, el("label", null, t("new_password")), password),
      u.id !== user.id && el("label", { class: "row" }, isAdmin, " " + t("is_admin")),
      el("div", { class: "row", style: { justifyContent: "flex-end", marginTop: "1rem" } },
        el("button", { onclick: () => backdrop.remove() }, t("cancel")),
        el("button", { class: "primary", onclick: async () => {
          const body = {};
          const newUsername = username.value.trim().toLowerCase();
          if (newUsername && newUsername !== u.username) body.username = newUsername;
          if (displayName.value !== (u.display_name || "")) body.display_name = displayName.value;
          if (password.value) body.password = password.value;
          if (u.id !== user.id && isAdmin.checked !== !!u.is_system_admin) body.is_system_admin = isAdmin.checked;
          if (Object.keys(body).length === 0) { backdrop.remove(); return; }
          try {
            await API.updateUser(u.id, body);
            backdrop.remove();
            await loadUsers();
            render();
          } catch (e) { alert((e.data && e.data.error) || e.message); }
        } }, t("save")),
      ),
    ));
    document.body.appendChild(backdrop);
  }

  function render() {
    clearNode(root);
    root.appendChild(renderTopbar(user));
    const container = el("div", { class: "container" });
    container.appendChild(el("div", { class: "row", style: { justifyContent: "space-between", marginBottom: "0.75rem" } },
      el("h2", { style: { margin: 0 } }, t("competitions")),
      user.is_system_admin && el("button", { class: "primary", onclick: openCompetitionModal }, t("new_competition")),
    ));

    if (state.competitions.length === 0) {
      container.appendChild(el("div", { class: "muted" }, t("no_competitions")));
    } else {
      const grid = el("div", { class: "grid" });
      for (const c of state.competitions) {
        grid.appendChild(el("div", { class: "card" },
          el("h2", null, c.name),
          el("div", { class: "muted", style: { marginBottom: "0.5rem" } },
            el("span", { class: "badge accent" }, t(c.role)),
          ),
          el("button", { class: "primary", onclick: () => navigate("competition", { id: c.id }) }, t("open")),
        ));
      }
      container.appendChild(grid);
    }

    if (user.is_system_admin) {
      container.appendChild(renderUsersAdmin());
    }
    root.appendChild(container);
  }

  await loadCompetitions();
  await loadUsers();
  render();
})();