(function () {
  var form = document.querySelector("[data-register-page-form]");
  var password = document.querySelector("[data-register-page-password]");
  var confirm = document.querySelector("[data-register-page-password-confirm]");
  var submitBtn = document.querySelector("[data-register-page-submit]") || (form && form.querySelector('button[type="submit"]'));
  var root = form || document;

  function bindToggle(key, input) {
    var btn = document.querySelector('[data-register-page-toggle="' + key + '"]');
    var icon = document.querySelector('[data-register-page-toggle-icon="' + key + '"]');
    if (!btn || !input || !icon) return;
    btn.addEventListener("click", function () {
      var show = input.getAttribute("type") === "password";
      input.setAttribute("type", show ? "text" : "password");
      icon.setAttribute("src", show ? "/static/images/eye-off.svg" : "/static/images/eye.svg");
      btn.setAttribute("aria-label", show ? "隐藏密码" : "显示密码");
    });
  }

  bindToggle("password", password);
  bindToggle("confirm", confirm);

  function clearFieldError(name) {
    var field = root.querySelector('[data-field="' + name + '"]');
    var err = root.querySelector('[data-field-error="' + name + '"]');
    if (field) field.classList.remove("is-error");
    if (err) {
      err.hidden = true;
      var text = err.querySelector("[data-field-error-text]");
      if (text) text.textContent = "";
    }
  }

  function clearAllErrors() {
    root.querySelectorAll("[data-field]").forEach(function (el) {
      el.classList.remove("is-error");
    });
    root.querySelectorAll("[data-field-error]").forEach(function (err) {
      err.hidden = true;
      var text = err.querySelector("[data-field-error-text]");
      if (text) text.textContent = "";
    });
  }

  function setFieldError(name, message) {
    var field = root.querySelector('[data-field="' + name + '"]');
    var err = root.querySelector('[data-field-error="' + name + '"]');
    if (field) field.classList.add("is-error");
    if (err) {
      err.hidden = false;
      var text = err.querySelector("[data-field-error-text]");
      if (text) text.textContent = message || "";
    }
  }

  function isAccountNo(value) {
    return /^[A-Za-z0-9]{6,20}$/.test(String(value || ""));
  }

  function isPassword(value) {
    var pwd = String(value || "");
    if (pwd.length < 8) return false;
    return /[A-Za-z]/.test(pwd) && /[0-9]/.test(pwd);
  }

  function validateForm() {
    clearAllErrors();
    var fd = new FormData(form);
    var account = String(fd.get("account") || "").trim();
    var pwd = String(fd.get("password") || "");
    var pwd2 = String(fd.get("passwordConfirm") || "");
    var agree = form.querySelector('input[name="agree"]');
    var valid = true;

    if (!account) {
      setFieldError("account", "请输入账号");
      valid = false;
    } else if (!isAccountNo(account)) {
      setFieldError("account", "账号需为 6 到 20 位字母或数字");
      valid = false;
    }

    if (!pwd) {
      setFieldError("password", "请输入密码");
      valid = false;
    } else if (!isPassword(pwd)) {
      setFieldError("password", "密码需 8 位以上，且同时包含字母与数字");
      valid = false;
    }

    if (!pwd2) {
      setFieldError("passwordConfirm", "请再次输入密码");
      valid = false;
    } else if (pwd2 !== pwd) {
      setFieldError("passwordConfirm", "两次输入的密码不一致");
      valid = false;
    }

    if (agree && !agree.checked) {
      setFieldError("agree", "请先同意用户条款与隐私政策");
      valid = false;
    }

    if (!valid) return null;
    return { accountNo: account, password: pwd };
  }

  function mapServerError(err) {
    var tip = (err && err.message) || "注册失败，请稍后重试";
    var code = err && err.code;
    if (code === 5005 || /已存在|重复|占用/.test(tip)) {
      setFieldError("account", tip);
      return;
    }
    if (/密码|password/i.test(tip)) {
      setFieldError("password", tip);
      return;
    }
    setFieldError("account", tip);
  }

  function setSubmitting(loading) {
    if (!submitBtn) return;
    submitBtn.disabled = !!loading;
    submitBtn.classList.toggle("is-loading", !!loading);
    submitBtn.textContent = loading ? "注册中…" : "注册";
  }

  if (form) {
    form.querySelectorAll("input").forEach(function (input) {
      input.addEventListener("input", function () {
        var name = input.getAttribute("name");
        if (name === "agree") clearFieldError("agree");
        else if (name) clearFieldError(name);
      });
      if (input.type === "checkbox") {
        input.addEventListener("change", function () {
          clearFieldError("agree");
        });
      }
    });

    form.addEventListener("submit", function (event) {
      event.preventDefault();
      if (!window.AuthAPI || !window.HttpRequest) {
        setFieldError("account", "认证脚本未加载，请刷新页面");
        return;
      }
      if (submitBtn && submitBtn.classList.contains("is-loading")) return;

      var payload = validateForm();
      if (!payload) return;

      setSubmitting(true);
      AuthAPI.register(payload)
        .then(function (res) {
          AuthAPI.toast((res && res.tip) || "注册成功", "success");
          window.setTimeout(function () {
            window.location.href = "/";
          }, 400);
        })
        .catch(function (err) {
          setSubmitting(false);
          mapServerError(err);
          AuthAPI.toast((err && err.message) || "注册失败", "error");
        });
    });
  }
})();