/**
 * 修改密码：POST /api/auth/profile { oldPassword, newPassword }
 */
(function () {
  var form = document.querySelector("[data-edit-password-form]");
  if (!form) return;

  var currentInput = form.querySelector("[data-edit-password-current]");
  var newInput = form.querySelector("[data-edit-password-new]");
  var confirmInput = form.querySelector("[data-edit-password-confirm]");
  var submitBtn = form.querySelector("[data-edit-password-submit]");

  document.querySelectorAll("[data-password-toggle]").forEach(function (btn) {
    btn.addEventListener("click", function () {
      var id = btn.getAttribute("data-password-toggle");
      var input = id ? document.getElementById(id) : null;
      if (!input) return;
      var show = input.type === "password";
      input.type = show ? "text" : "password";
      btn.textContent = show ? "隐藏" : "显示";
    });
  });

  function getField(name) {
    return form.querySelector('[data-edit-password-field="' + name + '"]');
  }

  function setFieldError(name, message) {
    var field = getField(name);
    if (!field) return;
    var error = field.querySelector("[data-edit-password-error]");
    field.classList.toggle("is-error", !!message);
    if (error) {
      if (message) {
        error.hidden = false;
        error.textContent = message;
      } else {
        error.hidden = true;
      }
    }
  }

  function clearErrors() {
    setFieldError("current", "");
    setFieldError("new", "");
    setFieldError("confirm", "");
  }

  function isValidLength(value) {
    return value.length >= 4 && value.length <= 16;
  }

  function toast(message, type) {
    if (window.AuthAPI) AuthAPI.toast(message, type);
    else if (typeof showToast === "function") showToast(message, type);
  }

  function validate() {
    clearErrors();
    var current = (currentInput && currentInput.value) || "";
    var next = (newInput && newInput.value) || "";
    var confirm = (confirmInput && confirmInput.value) || "";
    var ok = true;

    if (!current) {
      setFieldError("current", "请输入当前密码");
      ok = false;
    } else if (!isValidLength(current)) {
      setFieldError("current", "当前密码需为 4–16 个字符");
      ok = false;
    }

    if (!next) {
      setFieldError("new", "请输入新密码");
      ok = false;
    } else if (!isValidLength(next)) {
      setFieldError("new", "新密码需为 4–16 个字符");
      ok = false;
    } else if (next === current) {
      setFieldError("new", "新密码不能与当前密码相同");
      ok = false;
    }

    if (!confirm) {
      setFieldError("confirm", "请再次输入新密码");
      ok = false;
    } else if (confirm !== next) {
      setFieldError("confirm", "两次输入的新密码不一致");
      ok = false;
    }

    if (!ok) return null;
    return { oldPassword: current, newPassword: next };
  }

  [currentInput, newInput, confirmInput].forEach(function (input) {
    if (!input) return;
    input.addEventListener("input", function () {
      var field = input.closest("[data-edit-password-field]");
      if (!field) return;
      var name = field.getAttribute("data-edit-password-field");
      setFieldError(name, "");
    });
  });

  form.addEventListener("submit", function (event) {
    event.preventDefault();
    var payload = validate();
    if (!payload) return;
    if (!window.AuthAPI || !window.HttpRequest) {
      return;
    }

    if (submitBtn) submitBtn.disabled = true;

    AuthAPI.updateProfile(payload)
      .then(function () {
        toast("密码修改成功", "success");
        setTimeout(function () {
          window.location.href = "/setting/";
        }, 400);
      })
      .catch(function (err) {
        var tip = (err && err.message) || "修改失败，请稍后重试";
        if (/旧|当前|原密码|old/i.test(tip)) {
          setFieldError("current", tip);
          return;
        }
        if (/新密码|new/i.test(tip)) {
          setFieldError("new", tip);
          return;
        }
        toast(tip, "error");
      })
      .finally(function () {
        if (submitBtn) submitBtn.disabled = false;
      });
  });
})();