{% extends 'django_forms_workflows/base.html' %}
{% load forms_workflows_tags %}

{% block title %}Approval Inbox - {{ site_name }}{% endblock %}

{% block extra_css %}
<link rel="stylesheet" href="https://cdn.datatables.net/1.13.6/css/dataTables.bootstrap5.min.css">
<style>
  /* Improve pagination styling */
  .dataTables_wrapper .dataTables_paginate {
    margin-top: 0 !important;
  }

  .dataTables_wrapper .dataTables_paginate .pagination {
    margin-bottom: 0;
  }

  .dataTables_wrapper .dataTables_info {
    padding-top: 0;
  }

  /* Clean up table controls */
  .dataTables_wrapper .row {
    margin-left: 0;
    margin-right: 0;
  }

  /* Style the page length selector */
  .form-select-sm {
    border-color: #dee2e6;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  }

  .form-select-sm:focus {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
  }

  /* Improve search input styling */
  #searchContainer .input-group-text {
    border-right: 0;
  }

  #searchContainer input {
    border-left: 0;
  }

  #searchContainer input:focus {
    border-color: #dee2e6;
    box-shadow: none;
  }

  #searchContainer .input-group:focus-within .input-group-text {
    border-color: #86b7fe;
  }

  #searchContainer .input-group:focus-within input {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
  }

  /* Column picker */
  #colPickerDropdown .dropdown-menu { max-height: 340px; overflow-y: auto; }
  #colPickerDropdown .form-check { white-space: nowrap; }
</style>
{% endblock %}

{% block content %}
<div class="row">
  <div class="col-12">

    {# ── Page header ── #}
    <div class="d-flex align-items-center justify-content-between mb-3">
      <h1 class="mb-0"><i class="bi bi-inbox"></i> Approvals</h1>
    </div>

    {# ── Tab navigation ── #}
    <ul class="nav nav-tabs mb-3">
      <li class="nav-item">
        <a class="nav-link active" href="{% url 'forms_workflows:approval_inbox' %}">
          <i class="bi bi-hourglass-split me-1"></i>Pending
          <span class="badge bg-primary ms-1">{{ total_tasks_count }}</span>
        </a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="{% url 'forms_workflows:completed_approvals' %}">
          <i class="bi bi-archive me-1"></i>Completed Forms
          <span class="badge bg-secondary ms-1">{{ completed_count }}</span>
        </a>
      </li>
    </ul>

    <div class="d-flex align-items-center justify-content-end mb-3">
      <span class="text-muted small">
        {% if active_form %}
          Showing {{ tasks|length }} task{{ tasks|length|pluralize }} in
          <strong>{{ active_category.name }}</strong> &rsaquo; <strong>{{ active_form.name }}</strong>
          &mdash;
          <a href="?category={{ category_slug }}" class="text-decoration-none">clear form filter</a>
        {% elif active_category %}
          Showing {{ tasks|length }} task{{ tasks|length|pluralize }} in
          <strong>{{ active_category.name }}</strong>
          &mdash;
          <a href="?" class="text-decoration-none">clear filter</a>
        {% else %}
          {{ total_tasks_count }} pending task{{ total_tasks_count|pluralize }} total
        {% endif %}
      </span>
    </div>

    {# ── Category filter bar ── #}
    {% if category_counts %}
    <div class="mb-3 d-flex align-items-center justify-content-between" role="toolbar" aria-label="Filter by category">
      <div class="d-flex flex-wrap gap-2 align-items-center">
        <span class="text-muted small fw-semibold me-1">Filter:</span>

        <a href="?"
           class="btn btn-sm {% if not category_slug %}btn-primary{% else %}btn-outline-secondary{% endif %}"
           {% if not category_slug %}aria-current="true"{% endif %}>
          All
          <span class="badge {% if not category_slug %}bg-light text-dark{% else %}bg-secondary{% endif %} ms-1">
            {{ total_tasks_count }}
          </span>
        </a>

        {% for cat in category_counts %}
        <a href="?category={{ cat.slug }}"
           class="btn btn-sm {% if category_slug == cat.slug %}btn-primary{% else %}btn-outline-secondary{% endif %}"
           {% if category_slug == cat.slug %}aria-current="true"{% endif %}>
          {% if cat.icon %}<i class="bi {{ cat.icon }} me-1"></i>{% endif %}
          {{ cat.name }}
          <span class="badge {% if category_slug == cat.slug %}bg-light text-dark{% else %}bg-secondary{% endif %} ms-1">
            {{ cat.count }}
          </span>
        </a>
        {% endfor %}
      </div>
      {% if not form_counts %}<div id="searchContainer"></div>{% endif %}
    </div>
    {% endif %}

    {# ── Form filter bar with search (only when a category is active) ── #}
    {% if form_counts %}
    <div class="mb-3 d-flex flex-wrap gap-2 align-items-center justify-content-between ps-3 border-start border-2"
         role="toolbar" aria-label="Filter by form">
      <div class="d-flex flex-wrap gap-2 align-items-center">
        <span class="text-muted small fw-semibold me-1">Form:</span>

        <a href="?category={{ category_slug }}"
           class="btn btn-sm {% if not form_slug %}btn-primary{% else %}btn-outline-secondary{% endif %}"
           {% if not form_slug %}aria-current="true"{% endif %}>
          All
        </a>

        {% for form_item in form_counts %}
        <a href="?category={{ category_slug }}&form={{ form_item.slug }}"
           class="btn btn-sm {% if form_slug == form_item.slug %}btn-primary{% else %}btn-outline-secondary{% endif %}"
           {% if form_slug == form_item.slug %}aria-current="true"{% endif %}>
          {{ form_item.name }}
          <span class="badge {% if form_slug == form_item.slug %}bg-light text-dark{% else %}bg-secondary{% endif %} ms-1">
            {{ form_item.count }}
          </span>
        </a>
        {% endfor %}
      </div>
      <div id="searchContainer"></div>
    </div>
    {% elif not category_counts %}
    {# ── Search bar when no filters exist at all ── #}
    <div class="mb-3 d-flex justify-content-end">
      <div id="searchContainer"></div>
    </div>
    {% endif %}

    {# ── Task table ── #}
    {% if tasks %}
      <div class="table-responsive">
        <table class="table table-hover" id="approvalsTable">
          <thead>
            <tr>
              {% if not category_slug %}<th>Category</th>{% endif %}
              <th>Form</th>
              <th>Submitter</th>
              <th>Step</th>
              <th>Submitted</th>
              {% for field in form_fields %}<th class="extra-form-col" data-field="{{ field.field_name }}">{{ field.field_label }}</th>{% endfor %}
              <th>Actions</th>
            </tr>
          </thead>
          <tbody>
            {% for task in tasks %}
            <tr>
              {% if not category_slug %}
              <td>
                {% with cat=task.submission.form_definition.category %}
                {% if cat %}
                  {% if cat.icon %}<i class="bi {{ cat.icon }} me-1 text-muted"></i>{% endif %}
                  {{ cat.name }}
                {% else %}
                  <span class="text-muted">—</span>
                {% endif %}
                {% endwith %}
              </td>
              {% endif %}
              <td>{{ task.submission.form_definition.name }}</td>
              <td>{{ task.submission.submitter.get_full_name|default:task.submission.submitter.username }}</td>
              <td>{{ task.step_name }}</td>
              <td>{{ task.submission.submitted_at|date:"Y-m-d H:i" }}</td>
              {% for field in form_fields %}<td class="extra-form-col">{{ task.submission.form_data|get_item:field.field_name|default:"—" }}</td>{% endfor %}
              <td>
                <a href="{% url 'forms_workflows:approve_submission' task.id %}" class="btn btn-sm btn-primary">
                  <i class="bi bi-check-circle"></i> Review
                </a>
                <a href="{% url 'forms_workflows:submission_detail' task.submission.id %}" class="btn btn-sm btn-outline-secondary">
                  <i class="bi bi-eye"></i> View
                </a>
              </td>
            </tr>
            {% endfor %}
          </tbody>
        </table>
      </div>
    {% else %}
      <div class="alert alert-info">
        <i class="bi bi-info-circle"></i>
        {% if active_form %}
          No pending approvals for <strong>{{ active_form.name }}</strong> in <strong>{{ active_category.name }}</strong>.
        {% elif active_category %}
          No pending approvals in <strong>{{ active_category.name }}</strong>.
        {% else %}
          You have no pending approvals at this time.
        {% endif %}
      </div>
    {% endif %}

  </div>
</div>

{% if form_fields %}
{# Column picker dropdown – hidden in-place; JS moves it next to the search box #}
<div class="dropdown d-none" id="colPickerDropdown">
  <button class="btn btn-sm btn-outline-secondary" type="button"
          data-bs-toggle="dropdown" data-bs-auto-close="outside"
          aria-expanded="false" title="Customize columns">
    <i class="bi bi-gear-fill"></i>
  </button>
  <div class="dropdown-menu dropdown-menu-end p-3" style="min-width: 220px;">
    <p class="fw-semibold small mb-2 text-muted">Additional columns</p>
    {% for field in form_fields %}
    <div class="form-check">
      <input class="form-check-input col-toggle-chk" type="checkbox"
             id="col_chk_{{ field.field_name }}"
             data-field="{{ field.field_name }}">
      <label class="form-check-label small" for="col_chk_{{ field.field_name }}">
        {{ field.field_label }}
      </label>
    </div>
    {% endfor %}
  </div>
</div>
{% endif %}
{% endblock %}

{% block extra_js %}
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script src="https://cdn.datatables.net/1.13.6/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/1.13.6/js/dataTables.bootstrap5.min.js"></script>
<script>
$(document).ready(function() {
    if ($('#approvalsTable').length) {
        var table = $('#approvalsTable').DataTable({
            order: [[{% if not category_slug %}4{% else %}3{% endif %}, 'desc']],
            columnDefs: [
                { orderable: false, targets: -1 },
                {% if form_fields %}{ visible: false, targets: '.extra-form-col' }{% endif %}
            ],
            pageLength: 25,
            dom: '<"row"<"col-sm-12"tr>><"row mt-3"<"col-sm-12 col-md-5"i><"col-sm-12 col-md-7"p>>',
            language: {
                search: '',
                searchPlaceholder: 'Search approvals...',
                emptyTable: 'No pending approvals found.',
                zeroRecords: 'No matching approvals found.',
                info: 'Showing _START_ to _END_ of _TOTAL_ approvals',
                infoEmpty: 'Showing 0 to 0 of 0 approvals',
                infoFiltered: '(filtered from _MAX_ total approvals)',
                paginate: {
                    first: '&laquo;',
                    last: '&raquo;',
                    next: '&rsaquo;',
                    previous: '&lsaquo;'
                }
            }
        });

        // Build search box
        var searchBox = $('<div class="input-group input-group-sm" style="max-width: 300px;">' +
            '<span class="input-group-text bg-white"><i class="bi bi-search"></i></span>' +
            '<input type="search" class="form-control form-control-sm" placeholder="Search approvals..." aria-label="Search">' +
            '</div>');
        searchBox.find('input').on('keyup change', function() {
            table.search(this.value).draw();
        });

        {% if form_fields %}
        // ── Column picker ──────────────────────────────────────────────────
        var LS_KEY = 'approvals_col_prefs_{{ form_slug }}';
        var $picker = $('#colPickerDropdown').removeClass('d-none');

        // Place search + gear together in the search container
        var $controls = $('<div class="d-flex align-items-center gap-2"></div>');
        $controls.append(searchBox).append($picker);
        $('#searchContainer').append($controls);

        // Restore saved column preferences from localStorage
        var savedCols = [];
        try {
            var stored = localStorage.getItem(LS_KEY);
            if (stored) savedCols = JSON.parse(stored);
        } catch(e) { savedCols = []; }

        savedCols.forEach(function(fieldName) {
            var $th = $('th.extra-form-col[data-field="' + fieldName + '"]');
            if ($th.length) {
                table.column($th).visible(true);
                $('#col_chk_' + fieldName).prop('checked', true);
            }
        });

        // Toggle column visibility and persist preference
        $(document).on('change', '.col-toggle-chk', function() {
            var fieldName = $(this).data('field');
            var $th = $('th.extra-form-col[data-field="' + fieldName + '"]');
            table.column($th).visible(this.checked);
            var visible = [];
            $('.col-toggle-chk:checked').each(function() { visible.push($(this).data('field')); });
            try { localStorage.setItem(LS_KEY, JSON.stringify(visible)); } catch(e) {}
        });
        {% else %}
        $('#searchContainer').append(searchBox);
        {% endif %}

        // Add page length selector to bottom with improved styling
        var lengthSelect = $('<div class="d-flex align-items-center gap-2 mb-2">' +
            '<label class="mb-0 text-muted small">Show:</label>' +
            '<select class="form-select form-select-sm" style="width: auto;">' +
            '<option value="10">10</option>' +
            '<option value="25" selected>25</option>' +
            '<option value="50">50</option>' +
            '<option value="100">100</option>' +
            '<option value="-1">All</option>' +
            '</select>' +
            '<span class="text-muted small">entries</span>' +
            '</div>');
        lengthSelect.find('select').on('change', function() {
            table.page.len($(this).val()).draw();
        });
        $('.dataTables_info').parent().prepend(lengthSelect);
    }
});
</script>
{% endblock %}