(() => {
  "use strict";

  const fixture = new URLSearchParams(window.location.search).get("fixture") || "";
  const form = document.querySelector("#franchise-form");
  const formSteps = [...document.querySelectorAll("[data-step]")];
  const indicators = [...document.querySelectorAll("[data-step-indicator]")];
  const indicatorList = document.querySelector(".step-indicator");
  const areaField = document.querySelector("#area-field");
  const areaInput = document.querySelector("#exclusive-area");
  const areaOutput = document.querySelector("#area-conversion");
  const successPanel = document.querySelector("#inquiry-success");
  const submitState = document.querySelector("#submit-state");
  const submitButton = document.querySelector("#submit-inquiry");
  let currentStep = 1;

  const markBrokenImage = (image) => {
    const shell = image.closest(".image-shell");
    if (shell) shell.classList.add("is-broken");
  };

  document.querySelectorAll(".image-shell img").forEach((image) => {
    image.addEventListener("error", () => markBrokenImage(image));
    if (image.complete && image.naturalWidth === 0) markBrokenImage(image);
  });

  if (!form) return;

  const getRadioValue = (name) => form.querySelector(`input[name="${name}"]:checked`)?.value || "";
  const getSelectValue = (name) => {
    const field = form.elements.namedItem(name);
    return field instanceof HTMLSelectElement ? field.value : "";
  };
  const getInputValue = (name) => {
    const field = form.elements.namedItem(name);
    return field instanceof HTMLInputElement ? field.value.trim() : "";
  };

  const setStep = (step) => {
    currentStep = step;
    formSteps.forEach((section) => section.classList.toggle("is-current", Number(section.dataset.step) === step));
    indicators.forEach((item) => {
      const active = Number(item.dataset.stepIndicator) === step;
      item.classList.toggle("is-current", active);
      if (active) item.setAttribute("aria-current", "step");
      else item.removeAttribute("aria-current");
    });
    const heading = form.querySelector(`[data-step="${step}"] h3`);
    if (heading instanceof HTMLElement) {
      heading.setAttribute("tabindex", "-1");
      heading.focus({ preventScroll: true });
    }
  };

  const clearFieldError = (fieldId, errorId) => {
    const field = document.querySelector(`#${fieldId}`);
    const error = document.querySelector(`#${errorId}`);
    const wrapper = field?.closest(".form-field");
    wrapper?.classList.remove("has-error");
    field?.removeAttribute("aria-invalid");
    field?.removeAttribute("aria-describedby");
    if (error) error.textContent = "";
  };

  const setFieldError = (fieldId, errorId, message) => {
    const field = document.querySelector(`#${fieldId}`);
    const error = document.querySelector(`#${errorId}`);
    const wrapper = field?.closest(".form-field");
    wrapper?.classList.add("has-error");
    field?.setAttribute("aria-invalid", "true");
    field?.setAttribute("aria-describedby", errorId);
    if (error) error.textContent = message;
    return field;
  };

  const clearRadioError = (name, errorId) => {
    const radios = [...form.querySelectorAll(`input[name="${name}"]`)];
    const wrapper = radios[0]?.closest(".form-field");
    wrapper?.classList.remove("has-error");
    radios.forEach((radio) => {
      radio.removeAttribute("aria-invalid");
      radio.removeAttribute("aria-describedby");
    });
    const error = document.querySelector(`#${errorId}`);
    if (error) error.textContent = "";
  };

  const setRadioError = (name, errorId, message) => {
    const radios = [...form.querySelectorAll(`input[name="${name}"]`)];
    const wrapper = radios[0]?.closest(".form-field");
    wrapper?.classList.add("has-error");
    radios.forEach((radio) => {
      radio.setAttribute("aria-invalid", "true");
      radio.setAttribute("aria-describedby", errorId);
    });
    const error = document.querySelector(`#${errorId}`);
    if (error) error.textContent = message;
    return radios[0];
  };

  const validateStepOne = () => {
    const invalid = [];
    clearFieldError("demo-name", "demo-name-error");
    clearFieldError("region", "region-error");
    clearRadioError("areaKind", "area-kind-error");

    if (getInputValue("demoName").length < 2) {
      invalid.push(setFieldError("demo-name", "demo-name-error", "예시 호칭을 두 글자 이상 입력해 주세요."));
    }
    if (!getSelectValue("region")) {
      invalid.push(setFieldError("region", "region-error", "희망 지역을 골라 주세요."));
    }
    if (!getRadioValue("areaKind")) {
      invalid.push(setRadioError("areaKind", "area-kind-error", "희망 상권을 골라 주세요."));
    }
    invalid[0]?.focus();
    return invalid.length === 0;
  };

  const requiresArea = () => ["협의 중", "보유함"].includes(getRadioValue("storePossession"));

  const updateAreaField = () => {
    const required = requiresArea();
    if (areaField) areaField.hidden = !required;
    if (areaInput instanceof HTMLInputElement) {
      areaInput.required = required;
      if (!required) {
        areaInput.value = "";
        clearFieldError("exclusive-area", "exclusive-area-error");
        if (areaOutput) areaOutput.textContent = "면적을 입력하면 평으로도 보여 드립니다.";
      }
    }
  };

  const updateAreaConversion = () => {
    if (!(areaInput instanceof HTMLInputElement) || !areaOutput) return;
    const squareMeters = Number(areaInput.value);
    if (!Number.isFinite(squareMeters) || squareMeters <= 0) {
      areaOutput.textContent = "면적을 입력하면 평으로도 보여 드립니다.";
      return;
    }
    const pyeong = Math.round((squareMeters / 3.3058) * 10) / 10;
    areaOutput.textContent = `${squareMeters.toLocaleString("ko-KR")}㎡ · 약 ${pyeong.toLocaleString("ko-KR")}평`;
  };

  const validateStepTwo = () => {
    const invalid = [];
    clearRadioError("storePossession", "store-possession-error");
    clearFieldError("exclusive-area", "exclusive-area-error");
    clearFieldError("opening-window", "opening-window-error");
    clearRadioError("experience", "experience-error");

    if (!getRadioValue("storePossession")) {
      invalid.push(setRadioError("storePossession", "store-possession-error", "점포 상태를 골라 주세요."));
    }
    if (requiresArea()) {
      const value = Number(getInputValue("exclusiveArea"));
      if (!Number.isFinite(value) || value <= 0) {
        invalid.push(setFieldError("exclusive-area", "exclusive-area-error", "면적은 0보다 큰 숫자로 입력해 주세요."));
      }
    }
    if (!getSelectValue("openingWindow")) {
      invalid.push(setFieldError("opening-window", "opening-window-error", "희망 시작 시기를 골라 주세요."));
    }
    if (!getRadioValue("experience")) {
      invalid.push(setRadioError("experience", "experience-error", "운영 경험 여부를 골라 주세요."));
    }
    invalid[0]?.focus();
    return invalid.length === 0;
  };

  const reviewValues = () => {
    const squareMeters = Number(getInputValue("exclusiveArea"));
    const areaLabel = requiresArea() && squareMeters > 0
      ? `${squareMeters.toLocaleString("ko-KR")}㎡ · 약 ${(Math.round((squareMeters / 3.3058) * 10) / 10).toLocaleString("ko-KR")}평`
      : "해당 없음";
    const values = {
      demoName: getInputValue("demoName"),
      region: getSelectValue("region"),
      areaKind: getRadioValue("areaKind"),
      storePossession: getRadioValue("storePossession"),
      exclusiveArea: areaLabel,
      openingWindow: getSelectValue("openingWindow"),
      experience: getRadioValue("experience"),
    };
    Object.entries(values).forEach(([key, value]) => {
      const target = document.querySelector(`[data-review="${key}"]`);
      if (target) target.textContent = value || "—";
    });
  };

  form.querySelectorAll("[data-next]").forEach((button) => {
    button.addEventListener("click", () => {
      if (currentStep === 1 && validateStepOne()) setStep(2);
      else if (currentStep === 2 && validateStepTwo()) {
        reviewValues();
        setStep(3);
      }
    });
  });

  form.querySelectorAll("[data-back]").forEach((button) => {
    button.addEventListener("click", () => setStep(Math.max(1, currentStep - 1)));
  });

  form.querySelectorAll("input[name='storePossession']").forEach((input) => {
    input.addEventListener("change", updateAreaField);
  });
  areaInput?.addEventListener("input", updateAreaConversion);

  form.addEventListener("input", (event) => {
    const field = event.target;
    if (!(field instanceof HTMLElement) || !field.id) return;
    const errorId = `${field.id}-error`;
    if (document.querySelector(`#${errorId}`)) clearFieldError(field.id, errorId);
  });

  form.addEventListener("change", (event) => {
    const field = event.target;
    if (!(field instanceof HTMLInputElement)) return;
    if (field.type === "radio") {
      const names = {
        areaKind: "area-kind-error",
        storePossession: "store-possession-error",
        experience: "experience-error",
      };
      if (names[field.name]) clearRadioError(field.name, names[field.name]);
    }
  });

  form.addEventListener("submit", (event) => {
    event.preventDefault();
    const consent = document.querySelector("#demo-consent");
    const consentError = document.querySelector("#demo-consent-error");
    if (consent instanceof HTMLInputElement) {
      consent.removeAttribute("aria-invalid");
      consent.removeAttribute("aria-describedby");
    }
    if (consentError) consentError.textContent = "";
    if (!(consent instanceof HTMLInputElement) || !consent.checked) {
      consent?.setAttribute("aria-invalid", "true");
      consent?.setAttribute("aria-describedby", "demo-consent-error");
      if (consentError) consentError.textContent = "문의 체험 안내를 확인해 주세요.";
      consent?.focus();
      return;
    }

    if (submitButton instanceof HTMLButtonElement) {
      submitButton.disabled = true;
      submitButton.textContent = "화면 상태 확인 중";
    }
    if (submitState) submitState.textContent = "";

    window.setTimeout(() => {
      if (fixture === "inquiry-fail") {
        if (submitButton instanceof HTMLButtonElement) {
          submitButton.disabled = false;
          submitButton.textContent = "다시 시도하기";
        }
        if (submitState) {
          submitState.textContent = "지금은 문의 준비 상태를 바꾸지 못했어요. 입력 내용은 화면에 그대로 두었습니다.";
        }
        return;
      }

      form.hidden = true;
      if (indicatorList) indicatorList.hidden = true;
      if (successPanel) {
        successPanel.hidden = false;
        successPanel.focus();
      }
      if (submitButton instanceof HTMLButtonElement) {
        submitButton.disabled = false;
        submitButton.textContent = "문의 준비 마치기";
      }
    }, 450);
  });

  document.querySelector("#review-again")?.addEventListener("click", () => {
    if (successPanel) successPanel.hidden = true;
    form.hidden = false;
    if (indicatorList) indicatorList.hidden = false;
    setStep(3);
  });

  document.querySelector("#restart-form")?.addEventListener("click", () => {
    form.reset();
    form.hidden = false;
    if (successPanel) successPanel.hidden = true;
    if (indicatorList) indicatorList.hidden = false;
    if (submitState) submitState.textContent = "";
    document.querySelectorAll(".field-error").forEach((error) => { error.textContent = ""; });
    document.querySelectorAll(".has-error").forEach((field) => field.classList.remove("has-error"));
    updateAreaField();
    setStep(1);
  });

  updateAreaField();
  setStep(1);
})();