{% extends template_extends %}
{% load i18n %}

{% block js_scripts %}
  {{ available_idps|json_script:"available-idps-data" }}

  <script type="text/javascript">
    function filterResults(val) {
        const reg = new RegExp(val, 'i')

        const availableIdpList = document.getElementsByTagName("button");
        for (let i = 0; i < availableIdpList.length; i++) {
            const idp_element = availableIdpList[i]
            if (
                val &&
                !idp_element.classList.contains("recently-used-idp") &&
                !idp_element.textContent.match(reg)
            ) { {# idp[1] is the display name #}
                idp_element.style.display = "none";
            } else {
                idp_element.style.display = "block";
            }
        }
    }

    function _getCookie(name) {
      // Thanks to https://daily-dev-tips.com/posts/vanilla-javascript-cookies/
      // Add the = sign
      name = name + '=';

      // Get the decoded cookie
      const decodedCookie = decodeURIComponent(document.cookie);

      // Get all cookies, split on ; sign
      const cookies = decodedCookie.split(';');

      // Loop over the cookies
      for (let i = 0; i < cookies.length; i++) {
        // Define the single cookie, and remove whitespace
        const cookie = cookies[i].trim();

        // If this cookie has the name of what we are searching
        if (cookie.indexOf(name) == 0) {
          // Return everything after the cookies name
          return cookie.substring(name.length, cookie.length);
        }
      }
    }

    function storeRecentIdpCookie(idp_name) {
        const currentCookie = _getCookie("{{ recent_use_cookie_name }}");
        if (!currentCookie) {
            document.cookie = `{{ recent_use_cookie_name }}=${idp_name}; SameSite=strict; Secure`;
        } else if (!currentCookie.includes(idp_name)) {
            document.cookie = `{{ recent_use_cookie_name }}=${currentCookie}+${idp_name}; SameSite=strict; Secure`;
        }
    }

    function removeRecentIdpCookie(event, idp_name) {
        event.preventDefault();  {# Do not follow the underlying button link when clicking on the cross #}

        const currentCookie = _getCookie("{{ recent_use_cookie_name }}");
        if (currentCookie.includes(idp_name)) {
            let idp_name_list = currentCookie.split('+');
            idp_name_list.splice(idp_name_list.indexOf(idp_name), 1);

            if (idp_name_list.length === 0) {
                document.cookie = `{{ recent_use_cookie_name }}=; Max-Age=0; SameSite=strict; Secure`;
            } else {
                document.cookie = `{{ recent_use_cookie_name }}=${idp_name_list.join('+')}; SameSite=strict; Secure`;
            }
        }

        {# Hide the button #}
        event.target.parentElement.style.display = "none";
    }
  </script>
{% endblock %}

{% block content %}
  {{ block.super }}
  <div id="content-main" class="inner-container">
    <form action="{{ social_django_backend_begin_url }}" method="get" autocomplete="off">
      <p>{% translate 'Please choose your identity provider in the list below.' %}</p>

      <div class="form-row inline-row">
        <label>{% translate 'Filter results:' %}</label>
        <input type="text" onKeyUp="filterResults(this.value)" />
      </div>

      {% if latest_selected_idps %}
        <div class="submit-row">
          {% for idp in latest_selected_idps %}
              <button class="btn-idp-link recently-used-idp" type="submit" name="idp" value="{{ idp.name }}">
                {{ idp.edu_fed_data.display_name }}
                <span class="remove-idp-btn" onclick="removeRecentIdpCookie(event, '{{ idp.name }}')">x</span>
              </button>
          {% endfor %}
        </div>

        <div class="separator"></div>
      {% endif %}

      <div class="submit-row">
        {% for idp in available_idps %}
            <button class="btn-idp-link" type="submit" name="idp" value="{{ idp.name }}" onclick="storeRecentIdpCookie('{{ idp.name }}')">
              {% if idp.edu_fed_data.logo %}<img src="{{ idp.edu_fed_data.logo }}" width="16" height="16"/>&nbsp;{% endif %}{{ idp.edu_fed_data.display_name }}
            </button>
        {% endfor %}
      </div>
    </form>
  </div>
{% endblock %}