<template>
  <div class="admin-prereg">
    <!-- Page Header -->
    <div class="page-header">
      <div class="header-row">
        <div>
          <h1>Pre-Registrants</h1>
          <p v-if="stats">
            {{ stats.total }} total · {{ stats.pending }} pending ·
            {{ stats.selected }} selected · {{ stats.invited }} invited ·
            {{ stats.accepted }} accepted
          </p>
        </div>
        <div class="header-actions">
          <button
            class="btn"
            :disabled="!selectedIds.length"
            @click="markAsSelected"
          >
            Mark as Selected ({{ selectedIds.length }})
          </button>
          <button
            class="btn btn-primary"
            :disabled="!invitableIds.length"
            @click="openInviteModal"
          >
            Send Invites ({{ invitableIds.length }})
          </button>
        </div>
      </div>
    </div>

    <!-- Search / Filter -->
    <div class="filter-bar">
      <div class="field" style="margin-bottom: 0; flex: 1">
        <input
          v-model="searchQuery"
          placeholder="Search by name, email, city, role..."
        />
      </div>
      <div class="field" style="margin-bottom: 0">
        <select v-model="statusFilter" aria-label="Filter by status">
          <option value="">All Statuses</option>
          <option value="pending">Pending</option>
          <option value="selected">Selected</option>
          <option value="invited">Invited</option>
          <option value="accepted">Accepted</option>
          <option value="expired">Expired</option>
        </select>
      </div>
    </div>

    <!-- Table -->
    <div class="table-wrap">
      <div v-if="pending" class="loading-state">
        <div class="spinner" />
        <span>Loading pre-registrants...</span>
      </div>

      <div v-else-if="error" class="error-state">
        Error loading pre-registrants: {{ error }}
      </div>

      <table v-else-if="filtered.length">
        <thead>
          <tr>
            <th class="col-check">
              <UCheckbox
                label="Select all"
                :ui="{ label: 'sr-only' }"
                :model-value="
                  allVisibleSelected
                    ? true
                    : someVisibleSelected
                      ? 'indeterminate'
                      : false
                "
                @update:model-value="toggleSelectAll"
              />
            </th>
            <th>Name</th>
            <th>Email</th>
            <th>City</th>
            <th>Role</th>
            <th>Status</th>
            <th class="col-date">Registered</th>
          </tr>
        </thead>
        <tbody>
          <template v-for="pr in filtered" :key="pr._id">
            <tr
              :class="{ 'row-expanded': expandedId === pr._id }"
              @click="toggleExpand(pr._id)"
              style="cursor: pointer"
            >
              <td class="col-check" @click.stop>
                <UCheckbox
                  :label="`Select ${pr.name || pr.email}`"
                  :ui="{ label: 'sr-only' }"
                  :model-value="selectedIds.includes(pr._id)"
                  @update:model-value="toggleSelect(pr._id)"
                />
              </td>
              <td class="col-name">{{ pr.name || "—" }}</td>
              <td class="col-email">{{ pr.email }}</td>
              <td>{{ pr.city || "—" }}</td>
              <td>{{ pr.role || "—" }}</td>
              <td>
                <span class="status-badge" :class="`status-${pr.status}`">
                  {{ pr.status }}
                </span>
              </td>
              <td class="col-mono col-date">
                {{ formatDate(pr.createdAt) }}
              </td>
            </tr>

            <!-- Expanded detail row -->
            <tr v-if="expandedId === pr._id" class="detail-row">
              <td colspan="7">
                <div class="detail-panel">
                  <div class="detail-fields">
                    <div class="field">
                      <label>Admin Notes</label>
                      <textarea
                        v-model="editNotes"
                        rows="3"
                        placeholder="Add notes about this pre-registrant..."
                        @click.stop
                      ></textarea>
                    </div>
                    <div class="detail-actions">
                      <select
                        v-model="editStatus"
                        aria-label="Change status"
                        @click.stop
                      >
                        <option value="pending">Pending</option>
                        <option value="selected">Selected</option>
                      </select>
                      <button
                        class="btn"
                        @click.stop="saveDetail(pr._id)"
                        :disabled="savingDetail"
                      >
                        {{ savingDetail ? "Saving..." : "Save" }}
                      </button>
                    </div>
                  </div>
                  <div
                    v-if="pr.inviteEmailSentAt"
                    class="detail-meta"
                  >
                    Invite sent:
                    {{ new Date(pr.inviteEmailSentAt).toLocaleString() }}
                  </div>
                  <div v-if="pr.acceptedAt" class="detail-meta">
                    Accepted:
                    {{ new Date(pr.acceptedAt).toLocaleString() }}
                  </div>
                </div>
              </td>
            </tr>
          </template>
        </tbody>
      </table>

      <div v-else class="empty-state">
        No pre-registrants found matching your criteria
      </div>
    </div>

    <!-- Send Invites Modal -->
    <div
      v-if="showInviteModal"
      class="modal-overlay"
      @click.self="showInviteModal = false"
    >
      <div class="modal modal-wide">
        <div class="modal-header">
          <h2>Send Invitation Emails</h2>
          <button class="modal-close" @click="showInviteModal = false">
            &times;
          </button>
        </div>

        <div class="modal-body">
          <p class="help-text">
            Sending to <strong>{{ invitableIds.length }}</strong> pre-registrant{{
              invitableIds.length !== 1 ? "s" : ""
            }}. Each receives a unique invitation link valid for 48 hours.
          </p>

          <div class="field">
            <label>Email Template</label>
            <textarea v-model="inviteTemplate" rows="12"></textarea>
            <p class="help-text" style="margin-top: 4px">
              Tokens: <code>{name}</code>, <code>{acceptLink}</code>
            </p>
          </div>

          <div v-if="invitePreview" class="field">
            <label>Preview ({{ invitePreview.name || invitePreview.email }})</label>
            <pre class="preview-box">{{ invitePreviewText }}</pre>
          </div>

          <div v-if="inviteResults" class="results-box">
            <strong>Invitations sent</strong>
            <p class="status-ok">{{ inviteResults.sent }} sent</p>
            <p v-if="inviteResults.failed" class="status-error">
              {{ inviteResults.failed }} failed
            </p>
            <div v-if="inviteResults.results?.some((r) => !r.success)">
              <p
                v-for="fail in inviteResults.results.filter((r) => !r.success)"
                :key="fail.email"
                class="status-error"
                style="font-size: 11px"
              >
                {{ fail.email }}: {{ fail.error }}
              </p>
            </div>
          </div>
        </div>

        <div class="modal-actions">
          <button @click="showInviteModal = false" class="btn">
            {{ inviteResults ? "Done" : "Cancel" }}
          </button>
          <button
            v-if="!inviteResults"
            :disabled="sendingInvites"
            @click="submitInvites"
            class="btn btn-primary"
          >
            {{
              sendingInvites
                ? "Sending..."
                : `Send ${invitableIds.length} invitation${invitableIds.length !== 1 ? "s" : ""}`
            }}
          </button>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
definePageMeta({
  layout: "admin",
  middleware: "admin",
});

const toast = useToast();

const {
  data: preRegistrants,
  pending,
  error,
  refresh,
} = await useFetch("/api/admin/pre-registrants");

const { data: stats, refresh: refreshStats } = await useFetch(
  "/api/admin/pre-registrants/stats",
);

const searchQuery = ref("");
const statusFilter = ref("");
const selectedIds = ref([]);
const expandedId = ref(null);
const editNotes = ref("");
const editStatus = ref("pending");
const savingDetail = ref(false);

// Invite
const showInviteModal = ref(false);
const sendingInvites = ref(false);
const inviteResults = ref(null);

const DEFAULT_INVITE_TEMPLATE = `Hi {name},

You pre-registered for Ghost Guild, and we're ready for you.

Click below to accept your invitation, choose your circle, and set your contribution level:

{acceptLink}

This link expires in 48 hours. If it expires, we can send you a new one.

See you inside.`;

const inviteTemplate = ref(DEFAULT_INVITE_TEMPLATE);

const filtered = computed(() => {
  if (!preRegistrants.value) return [];

  return preRegistrants.value.filter((pr) => {
    const q = searchQuery.value.toLowerCase();
    const matchesSearch =
      !q ||
      (pr.name || "").toLowerCase().includes(q) ||
      pr.email.toLowerCase().includes(q) ||
      (pr.city || "").toLowerCase().includes(q) ||
      (pr.role || "").toLowerCase().includes(q);

    const matchesStatus = !statusFilter.value || pr.status === statusFilter.value;

    return matchesSearch && matchesStatus;
  });
});

// Selection helpers
const allVisibleSelected = computed(() => {
  if (!filtered.value.length) return false;
  return filtered.value.every((pr) => selectedIds.value.includes(pr._id));
});

const someVisibleSelected = computed(() => {
  return filtered.value.some((pr) => selectedIds.value.includes(pr._id));
});

// IDs of selected pre-registrants that can actually be invited (pending or selected status)
const invitableIds = computed(() => {
  if (!preRegistrants.value) return [];
  return selectedIds.value.filter((id) => {
    const pr = preRegistrants.value.find((p) => p._id === id);
    return pr && (pr.status === "pending" || pr.status === "selected");
  });
});

const toggleSelectAll = () => {
  if (allVisibleSelected.value) {
    const visibleIds = new Set(filtered.value.map((pr) => pr._id));
    selectedIds.value = selectedIds.value.filter((id) => !visibleIds.has(id));
  } else {
    const currentSet = new Set(selectedIds.value);
    for (const pr of filtered.value) {
      currentSet.add(pr._id);
    }
    selectedIds.value = [...currentSet];
  }
};

const toggleSelect = (id) => {
  const idx = selectedIds.value.indexOf(id);
  if (idx >= 0) {
    selectedIds.value.splice(idx, 1);
  } else {
    selectedIds.value.push(id);
  }
};

// Expand / collapse detail rows
const toggleExpand = (id) => {
  if (expandedId.value === id) {
    expandedId.value = null;
    return;
  }
  expandedId.value = id;
  const pr = preRegistrants.value?.find((p) => p._id === id);
  editNotes.value = pr?.adminNotes || "";
  editStatus.value = pr?.status === "selected" ? "selected" : "pending";
};

const saveDetail = async (id) => {
  savingDetail.value = true;
  try {
    await $fetch(`/api/admin/pre-registrants/${id}`, {
      method: "PUT",
      body: { status: editStatus.value, adminNotes: editNotes.value },
    });
    await refresh();
    await refreshStats();
    toast.add({ title: "Updated", color: "green" });
  } catch (err) {
    toast.add({
      title: "Failed to update",
      description: err.data?.statusMessage || err.message,
      color: "red",
    });
  } finally {
    savingDetail.value = false;
  }
};

// Mark selected as "selected" status
const markAsSelected = async () => {
  try {
    await $fetch("/api/admin/pre-registrants/bulk-status", {
      method: "PATCH",
      body: { ids: selectedIds.value, status: "selected" },
    });
    await refresh();
    await refreshStats();
    selectedIds.value = [];
    toast.add({ title: "Marked as selected", color: "green" });
  } catch (err) {
    toast.add({
      title: "Failed to update status",
      description: err.data?.statusMessage || err.message,
      color: "red",
    });
  }
};

// Invite modal
const invitePreview = computed(() => {
  if (!invitableIds.value.length || !preRegistrants.value) return null;
  return preRegistrants.value.find((pr) => pr._id === invitableIds.value[0]);
});

const invitePreviewText = computed(() => {
  if (!invitePreview.value) return "";
  return inviteTemplate.value
    .replace(/\{name\}/g, invitePreview.value.name || "there")
    .replace(/\{acceptLink\}/g, "https://ghostguild.org/accept-invite#...");
});

const openInviteModal = () => {
  inviteResults.value = null;
  showInviteModal.value = true;
};

const submitInvites = async () => {
  sendingInvites.value = true;
  try {
    const result = await $fetch("/api/admin/pre-registrants/invite", {
      method: "POST",
      body: {
        preRegistrantIds: invitableIds.value,
        emailTemplate: inviteTemplate.value,
      },
    });

    inviteResults.value = result;
    await refresh();
    await refreshStats();
    selectedIds.value = [];

    toast.add({
      title: `Sent ${result.sent} invitation${result.sent !== 1 ? "s" : ""}`,
      description: result.failed ? `${result.failed} failed` : undefined,
      color: result.failed ? "orange" : "green",
    });
  } catch (err) {
    toast.add({
      title: "Failed to send invitations",
      description: err.data?.statusMessage || err.message,
      color: "red",
    });
  } finally {
    sendingInvites.value = false;
  }
};

const formatDate = (dateString) => {
  return new Date(dateString).toLocaleDateString();
};
</script>

<style scoped>
.admin-prereg {
  max-width: 1100px;
  margin: 0 auto;
}

/* ---- PAGE HEADER ---- */
.page-header {
  padding: 28px 28px 20px;
  border-bottom: 1px dashed var(--border);
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header h1 {
  font-family: "Brygada 1918", serif;
  font-size: 24px;
  font-weight: 500;
  color: var(--text-bright);
  line-height: 1.2;
  margin-bottom: 4px;
}

.page-header p {
  font-size: 12px;
  color: var(--text-dim);
}

.header-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* ---- FILTER BAR ---- */
.filter-bar {
  display: flex;
  gap: 12px;
  padding: 16px 28px;
  border-bottom: 1px dashed var(--border);
}

/* ---- TABLE ---- */
.table-wrap {
  padding: 0 28px 24px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

thead th {
  text-align: left;
  padding: 12px 10px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  border-bottom: 1px dashed var(--border);
}

tbody tr {
  border-bottom: 1px dashed var(--border);
  transition: background 0.1s;
}

tbody tr:hover {
  background: var(--surface);
}

tbody td {
  padding: 10px;
  color: var(--text);
  vertical-align: middle;
}

.col-check {
  width: 32px;
  padding-left: 0;
  padding-right: 4px;
}

.col-name {
  font-weight: 500;
  color: var(--text-bright);
}

.col-email {
  color: var(--text-dim);
  font-size: 11px;
}

.col-mono {
  font-variant-numeric: tabular-nums;
}

.col-date {
  font-size: 11px;
  color: var(--text-faint);
}

/* ---- STATUS BADGES ---- */
.status-badge {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 6px;
  border: 1px dashed var(--border);
}

.status-pending {
  color: var(--text-faint);
}

.status-selected {
  color: var(--candle);
  border-color: var(--candle);
}

.status-invited {
  color: var(--text-bright);
  border-color: var(--text-dim);
}

.status-accepted {
  color: var(--green, #4a7);
  border-color: var(--green, #4a7);
}

.status-expired {
  color: var(--ember);
  border-color: var(--ember);
}

/* ---- EXPANDED DETAIL ROW ---- */
.row-expanded {
  background: var(--surface);
}

.detail-row td {
  padding: 0 10px 16px;
  border-bottom: 1px dashed var(--border);
}

.detail-panel {
  padding: 12px 0;
}

.detail-fields {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.detail-fields .field {
  flex: 1;
  margin-bottom: 0;
}

.detail-actions {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  flex-shrink: 0;
}

.detail-meta {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 8px;
}

/* ---- STATUS INDICATORS ---- */
.status-ok {
  color: var(--green, #4a7);
  font-size: 11px;
}

.status-error {
  color: var(--ember);
  font-size: 11px;
}

/* ---- MODALS ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal {
  background: var(--bg);
  border: 1px dashed var(--border);
  max-width: 440px;
  width: 100%;
  margin: 16px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-wide {
  max-width: 640px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px 16px;
  border-bottom: 1px dashed var(--border);
}

.modal-header h2 {
  font-family: "Brygada 1918", serif;
  font-size: 18px;
  font-weight: 500;
  color: var(--text-bright);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-faint);
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text);
}

.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 24px;
  border-top: 1px dashed var(--border);
}

/* ---- HELP TEXT ---- */
.help-text {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.5;
}

.help-text code {
  color: var(--text-bright);
  font-size: 11px;
}

/* ---- PREVIEW BOX ---- */
.preview-box {
  font-family: "Commit Mono", monospace;
  font-size: 11px;
  color: var(--text-dim);
  background: var(--surface);
  border: 1px dashed var(--border);
  padding: 16px;
  white-space: pre-wrap;
  overflow: auto;
  max-height: 200px;
  line-height: 1.5;
}

/* ---- RESULTS BOX ---- */
.results-box {
  padding: 16px 20px;
  border: 1px dashed var(--border);
  margin-top: 16px;
}

.results-box strong {
  color: var(--text-bright);
  font-size: 13px;
  display: block;
  margin-bottom: 4px;
}

/* ---- STATES ---- */
.loading-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-faint);
  font-size: 12px;
}

.error-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--ember);
  font-size: 12px;
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-faint);
  font-size: 12px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px dashed var(--candle);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 12px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .page-header {
    padding: 24px 20px 16px;
  }

  .header-row {
    flex-direction: column;
  }

  .header-actions {
    flex-wrap: wrap;
  }

  .filter-bar {
    flex-direction: column;
    padding: 12px 20px;
  }

  .table-wrap {
    padding: 0 12px 20px;
    overflow-x: auto;
  }

  table {
    min-width: 600px;
  }

  .detail-fields {
    flex-direction: column;
  }
}
</style>
