var OffersFinder = (function () {
  const dpForms = document.querySelectorAll("#leadFormConnecOfferstInline");

  if (dpForms[0].attachEvent) {
    dpForms[0].attachEvent("submit", dpSubmit);
  } else {
    dpForms[0].addEventListener("submit", dpSubmit);
  }

  const dpCip2Divs = document.querySelectorAll("#cip2div");
  const dpCip6Divs = document.querySelectorAll("#cip6div");

  function validateProgramInfo() {
    var data = ConvertFormToJSON(
      document.getElementById("leadFormConnecOfferstInline")
    );
    console.log("validate basic info form data = " + JSON.stringify(data));

    // Form Validation
    //if (data.cip0 == "" || data.cip2 == "") {
    if (data.cip0 == "") {
      //alert("Please select a study area and major.");
      alert("Please select at least a study area.");
      return;
    }
    return true;
  }

  function submitProgramInfo(e) {
    e.preventDefault();
    is_valid = validateProgramInfo();
    if (is_valid) {
      dpSubmit(e);
    }
  }

  function dpSubmit(e) {
    if (e.preventDefault) e.preventDefault();
    var data = ConvertFormToJSON(
      document.getElementById("leadFormConnecOfferstInline")
    );
    console.log("dpSubmit form data = " + JSON.stringify(data));

    var major_slug = data.cip0;
    if (data.cip2 != "" && typeof data.cip2 !== "undefined") {
      major_slug += "/" + data.cip2;
    }
    if (data.cip6 != "" && typeof data.cip6 !== "undefined") {
      major_slug += "/" + data.cip6;
    }
    console.log("offers_lookup major_slug = " + major_slug);
    var backBtn = document.getElementById("nothanks");
    backBtn.setAttribute(
      "href",
      "https://graddegree.com/majors/" +
        major_slug +
        "/rankings/best-schools/"
    );

    dpOffersFetch(major_slug);
    return false;
  }

  function dpOffersFetch(majorSlug) {
    var url = "/majors/" + majorSlug + "/offers.json";
    // var url = '/' + majorSlug + '/offers.json';
    clearResults();
    var loadingStateElement = document.getElementById("loadingState");
    loadingStateElement.style.display = "block";

    fetch(url)
      .then((response) => response.json())
      .then((data) => {
        buildResultsOrRedirect(data, majorSlug);
      })
      .catch((error) => {
        loadingStateElement.style.cssText = "display: none !important;";
        console.log("ERROR FETCHING major offers");
        console.log("json fetch for URL: " + url + "Error: ", error);
      });
  }

  function clearResults() {
    // Clear existing results
    var resultsContainer = document.getElementById("searchResults");
    var esResults = document.getElementsByClassName("esy_widget_container")[0];
    esResults.innerHTML = "";
    resultsContainer.innerHTML = "";
  }

  function buildResultsOrRedirect(offers, majorSlug) {
    var template = "";
    var formData = ConvertFormToJSON(
      document.getElementById("leadFormConnecOfferstInline")
    );
    console.log("json_data for: " + majorSlug);
    console.log(offers);

    if (!offers || offers.length === 0) {
      // No offers found, redirect to rankings page
      template = "rankings/best-schools/";
      location.href =
        "https://graddegree.com/majors/" + majorSlug + "/" + template;
    } else {
      // Offers found, build results page
      buildResults(offers, formData, majorSlug);
    }
  }

  function buildResults(offers, formData, majorSlug) {
    var esyohOffers = getRelevantEsyohOffers(offers, formData);

    if (esyohOffers.length > 0) {
      var esyohListingCategoryIds = esyohOffers.map((offer) => {
        var credentialSourceMeta = JSON.parse(
          htmlUnescape(offer.credential_source_meta)
        );
        return credentialSourceMeta.esyoh_id;
      });

      // buildEsyohWidget(esyohListingCategoryIds);
      buildAndRedirectUrl(formData, majorSlug);
    } else {
      // No ESYOH offers found, build generic results
      tryBuildSnhuOffers(offers, formData, majorSlug);
    }
  }

  function tryBuildSnhuOffers(offersData, formData, majorSlug) {
    // else use direct offers (ie. SNHU)
    var directOffers = offersData.offers.filter(
      (offer) => offer.credential_source !== "esyoh"
    );
    var title = "Featured Programs";
    var intro = "Schools that offer programs in your area of interest";
    var widgetId = "featured_programs";
    var maxDisplay = 5;
    var resultsContainer = document.getElementById("searchResults");
    var container = document.createElement("div");

    if (directOffers.length > 0) {
      container.setAttribute("name", widgetId);
      container.classList.add("featured-schools");
      container.innerHTML = `
            <div style="width:100%;margin:40px 0px 20px 0px;padding:0px;text-align:center;border-bottom:1px solid #D2D2D2;">
                <span style="font-color:#666666;font-size:0.6em;font-weight:300;width:100%;text-align:center;">ADVERTISEMENTS</span>
            </div>
        `;

      if (title.length > 0 || intro.length > 0) {
        if (title.length > 0) {
          container.innerHTML += `<h3>${title}</h3>`;
        }
        if (intro.length > 0) {
          container.innerHTML += `<p>${intro}</p>`;
        }
        container.innerHTML += `<div style="border-top: 1px solid #D2D2D2;">`;
      } else {
        container.innerHTML += `<div>`;
      }

      directOffers.slice(0, maxDisplay).forEach((offer) => {
        var pageUrlNoPrefix = "graddegree.com/" + majorSlug;
        var pageUrlNoDomain = majorSlug;
        var leadUrl = offer.lead_url
          .replace(
            "[page_url_no_prefix]",
            encodeURIComponent(pageUrlNoPrefix).replace("/", "%2f")
          )
          .replace(
            "[page_url_no_domain]",
            encodeURIComponent(pageUrlNoDomain).replace("/", "%2f")
          )
          .replace("collegefactual-linkout", "graddegree-linkout");

        console.log("leadUrl = " + leadUrl);

        container.innerHTML += `
              <div class="snhuOfferContainer">
                  <div class="textItem">
                      <p>
                        <a href="${leadUrl}" target="_blank"
                           class="headerLink">${
                             offer.credential_headline || offer.credential_name
                           }</a>
                      </p>
                      <p>${offer.credential_teaser}</p>
                      <p><a href="${leadUrl}" class="learnMoreLink" target="_blank">Learn More</a></p>
                  </div>
                  <div class="logoItem">
                      <a target="_blank" rel="sponsored" href="${leadUrl}">
                          <img src="${offer.credential_image_thumbnail}" alt="${
          offer.school_name
        } Logo" width="150">
                      </a>
                      <a id="featured_program_button" role="button" class="btn" target="_blank" href="${leadUrl}">Visit Site</a>
                  </div>
              </div>
            `;
      });
      hideLoadingState();
      container.innerHTML += `</div>`;
      resultsContainer.appendChild(container);
    } else {
      setTimeout(() => {
        hideLoadingState();
        container.innerHTML += `<h3>Found Best Schools rankings in your area of interest</h3>`;
        container.innerHTML += `<p>Taking you there automatically</p>`;
        container.innerHTML += `</div>`;
        resultsContainer.appendChild(container);
      }, 1500);

      setTimeout(() => {
        radirectToRankings(majorSlug);
      }, 3500);
    }
  }

  function hideLoadingState() {
    var loadingStateElement = document.getElementById("loadingState");
    loadingStateElement.style.cssText = "display: none !important;";
  }

  function radirectToRankings(majorSlug) {
    document.location.href =
      "https://graddegree.com/majors/" +
      majorSlug +
      "/rankings/best-schools/";
  }

  function getRelevantEsyohOffers(offersData, formData) {
    // Narrow List to Current Degree Level If Available
    console.log("formData = " + JSON.stringify(formData));
    var mostRelevantOnly = formData.mostRelevantOnly;
    var minRelevance = 0.8;
    var maxRelevance = 1.0;

    var returnOffers = [];
    var relevantOffers = [];

    var featuredOffers = offersData.offers.filter(
      (offer) => offer.credential_source === "esyoh"
    );
    if (featuredOffers.length === 0) {
      return relevantOffers;
    }

    if (formData.level) {
      featuredOffers = featuredOffers.filter(
        (offer) => offer.education_level_type_slug === formData.level
      );
    }

    // Get Sorted List of Featured Offers that Meet Relevance Requirements
    featuredOffers = featuredOffers
      .sort((a, b) => b.lead_cpl - a.lead_cpl)
      .sort((a, b) => b.relevance - a.relevance)
      .slice(0);

    featuredOffers.forEach((offer) => {
      if (offer.relevance >= minRelevance && offer.relevance <= maxRelevance) {
        console.log("offer relevance = ", offer.relevance);
        relevantOffers.push(offer);
      }
    });

    // TODO: Consider doing deeper display if only a single program
    // If relevant ESYOH offers use those
    if (relevantOffers.length > 0) {
      if (mostRelevantOnly) {
        // return only 1 top offer, whatever is most relevant
        returnOffers = featuredOffers
          .filter((offer) => offer.relevance >= 0.5)
          .sort((a, b) => b.relevance - a.relevance)
          .slice(0, 1);
      } else {
        // If opted to NOT just show most relevant, show all relevant
        // For now only filtering to those with exact 1.0 match
        returnOffers = relevantOffers.filter((offer) => offer.relevance >= 0.9);
      }
    }
    return returnOffers;
  }

  function buildAndRedirectUrl(formData, majorSlug) {
    // Get the current base URL including protocol and host
    const baseUrl = window.location.origin;

    // Construct the path with selected slugs
    let path = "majors" + "/" + majorSlug;
    path += "/offers.html";

    // Append query parameter for the level of education
    if (formData.level) {
      path += "?level=" + encodeURIComponent(formData.level);
    }
    const fullUrl = baseUrl + "/" + path;
    // Redirect the browser to the constructed URL
    window.location.href = fullUrl;
  }

  function buildEsyohWidget(categoryIds) {
    console.log("categoryIds = " + categoryIds);
    setTimeout(() => {
      var loadingStateElement = document.getElementById("loadingState");
      loadingStateElement.style.cssText = "display: none !important;";

      ESY.Widget({
        category_id: `'${categoryIds.join(",")}'`,
        new_window: "",
        results: "3",
        title: "",
        domain_id: "graddegree.com",
        type: "listings",
        widget_layout: "vertical",
        intro: "",
        placement: "",
      });
    }, 1000);
  }

  function populateDropdown(selector, options, currentValue) {
    const select = document.getElementById(selector);
    const existingOptions = select.children;
    if (existingOptions.length > 1) {
      for (var i = existingOptions.length - 1; i > 0; i--) {
        select.removeChild(existingOptions[i]);
      }
    }
    select.disabled = options.length === 0;

    options.forEach((option) => {
      if (option.slug !== "None") {
        // Exclude options with 'None' as slug
        const opt = document.createElement("option");
        opt.value = option.slug;
        opt.text = option.name;
        if (option.slug === currentValue) {
          opt.selected = true;
        }
        select.appendChild(opt);
      }
    });
  }

  // Function to handle changes in cip0 and cip2 dropdowns
  function handleDropdownChange() {
    const cip0Select = document.getElementById("cip0");
    const cip2Select = document.getElementById("cip2");
    const cip6Select = document.getElementById("cip6");
    const focusDiv = document.getElementById("focus");
    const findRankingsBtn = document.getElementById("findRankingsBtn"); // Assume button has this ID

    // Initially disable the button
    findRankingsBtn.disabled = true;

    cip0Select.addEventListener("change", function () {
      updateCip2Dropdown(this.value);
      populateDropdown("cip6", [], null); // Reset cip6 when cip2 changes
      findRankingsBtn.disabled = !this.value || this.value === "";
      findRankingsBtn.disabled = true; // Keep button disabled until cip2 is selected
    });

    cip2Select.addEventListener("change", function () {
      const cip2Entry = grad_degree_majors_list[cip0Select.value].cip4s.find(
        (cip4) => cip4.cip4_slug === this.value
      );

      if (cip2Entry && cip2Entry.cip6s) {
        var cip6Options = cip2Entry.cip6s.map((cip6) => {
          return { name: cip6.cip6_name, slug: cip6.cip6_slug };
        });
        populateDropdown("cip6", cip6Options, null);
        // focusDiv.style.display = "block";
      } else {
        populateDropdown("cip6", [], null); // Reset cip6 if no cip4 is found
      }
      findRankingsBtn.disabled = !this.value || this.value === "";
    });

    cip6Select.addEventListener("change", function () {
      // findRankingsBtn.disabled = !this.value || this.value === "";
    });
  }

  // Function to update cip2 based on cip0 selection
  function updateCip2Dropdown(selectedCip0) {
    if (selectedCip0) {
      const cip2Options = grad_degree_majors_list[selectedCip0].cip4s
        .map((cip4) => {
          return { name: cip4.cip4_name, slug: cip4.cip4_slug };
        })
        .sort((a, b) => a.name.localeCompare(b.name));

      populateDropdown("cip2", cip2Options, null);
    } else {
      populateDropdown("cip2", [], null); // Reset cip2 if no cip0 is found
    }
  }

  // Utility function to unescape HTML entities
  function htmlUnescape(str) {
    var temp = document.createElement("div");
    temp.innerHTML = str;
    var result = temp.childNodes[0] ? temp.childNodes[0].nodeValue : "";
    temp.remove();
    return result;
  }

  function populateInitialValues() {
    // Code to handle URL parameters and prefill values
    document.getElementById("landing_url").value = window.location.href;
    var return_url = GetParameterValues("return_url");

    if (return_url != "" && return_url != undefined && return_url != null) {
      var backBtn = document.getElementById("nothanks");
      backBtn.setAttribute(
        "href",
        decodeURIComponent(GetParameterValues("return_url")) ||
          "https://graddegree.com/"
      );
      backBtn.addEventListener("click", nextPage);
      document.getElementById("referring_url").value = return_url;
    } else {
      document.getElementById("referring_url").value = document.referrer;
    }
  }

  function initializeDropdowns() {
    var currentCip2 = null;
    var cip2Options = Object.keys(grad_degree_majors_list)
      .map((key) => {
        return { name: grad_degree_majors_list[key].cip2_name, slug: key };
      })
      .sort((a, b) => a.name.localeCompare(b.name));

    populateDropdown("cip0", cip2Options, currentCip2);
    if (currentCip2) updateCip2Dropdown(currentCip2);
  }

  function nextPage(e) {
    e.preventDefault();
    window.location.href = document.getElementById("nothanks").href;
    return true;
  }

  // Publicly exposed functions
  return {
    initialize: function () {
      populateInitialValues();
      initializeDropdowns();
      handleDropdownChange();
    },

    submitProgramInfo: submitProgramInfo,
  };

  /* Common Shared Functions */
  function GetParameterValues(param) {
    var url = window.location.href
      .slice(window.location.href.indexOf("?") + 1)
    .split("&");
  for (var i = 0; i < url.length; i++) {
    var urlparam = url[i].split("=");
    if (urlparam[0] == param) {
      return urlparam[1];
    }
    }
  }

  function ConvertFormToJSON(form) {
    var json = {};
    const formData = new FormData(form);
    for (const [key, value] of formData.entries()) {
    json[key] = value || "";
  }
    return json;
  }
})();

window.onload = OffersFinder.initialize;