Water for Tomorrow

document.addEventListener("DOMContentLoaded", function () {
    const oneTimeBtn = document.getElementById("BCM-onetime");
    const monthlyBtn = document.getElementById("BCM-monthly");
    const amountButtons = document.querySelectorAll(".BCM-amount-button");
    const customInput = document.querySelector(".BCM-custom-amount");
    const submitBtn = document.getElementById("BCM-submit-form");

    // Set default states
    oneTimeBtn.classList.add("active");
    if (amountButtons.length > 0) {
      amountButtons[0].classList.add("active");
    }

    function toggleFrequency(activeBtn, inactiveBtn) {
      activeBtn.classList.add("active");
      inactiveBtn.classList.remove("active");
      updateSubmitLink();
    }

    oneTimeBtn.addEventListener("click", () => toggleFrequency(oneTimeBtn, monthlyBtn));
    monthlyBtn.addEventListener("click", () => toggleFrequency(monthlyBtn, oneTimeBtn));

    amountButtons.forEach(button => {
      button.addEventListener("click", function (e) {
        e.preventDefault();
        amountButtons.forEach(btn => btn.classList.remove("active"));
        this.classList.add("active");
        if (customInput) customInput.value = '';
        updateSubmitLink();
      });
    });

    if (customInput) {
      customInput.addEventListener("focus", function () {
        amountButtons.forEach(btn => btn.classList.remove("active"));
      });

      customInput.addEventListener("input", updateSubmitLink);
    }

    function getSelectedFrequency() {
      return oneTimeBtn.classList.contains("active") ? "one-time" : "monthly";
    }

    function getSelectedAmount() {
      const activeBtn = document.querySelector(".BCM-amount-button.active");
      if (activeBtn) {
        return activeBtn.textContent.replace(/\$/g, "").trim();
      } else if (customInput && customInput.value) {
        return customInput.value.trim();
      }
      return "";
    }

    function updateSubmitLink() {
      const baseUrl = submitBtn.getAttribute("href").split('?')[0];
      const frequency = getSelectedFrequency();
      const amount = getSelectedAmount();

      if (amount) {
        submitBtn.setAttribute(
          "href",
          `${baseUrl}?frequency=${encodeURIComponent(frequency)}&amount=${encodeURIComponent(amount)}`
        );
      } else {
        submitBtn.setAttribute("href", baseUrl);
      }
    }

    updateSubmitLink();
  });