<template>
  <div>
    <div class="page-header">
      <h2>VLANs</h2>
      <button class="btn btn-primary" @click="openModal()">+ Add VLAN</button>
    </div>

    <!-- Search -->
    <div class="filters">
      <input
        v-model="search"
        type="text"
        class="form-control"
        placeholder="Search VLANs..."
        @input="debouncedSearch"
      />
      <select v-model="typeFilter" class="form-control" @change="applyFilter">
        <option value="">All Types</option>
        <option value="data">Data</option>
        <option value="voice">Voice</option>
        <option value="management">Management</option>
        <option value="guest">Guest</option>
        <option value="iot">IoT</option>
      </select>
    </div>

    <div class="card">
      <div v-if="loading" class="loading">Loading...</div>

      <template v-else>
        <div class="table-container">
          <table>
            <thead>
              <tr>
                <th>VLAN #</th>
                <th>Name</th>
                <th>Type</th>
                <th>Description</th>
                <th>Subnets</th>
                <th>Actions</th>
              </tr>
            </thead>
            <tbody>
              <tr v-for="vlan in vlans" :key="vlan.vlanid">
                <td class="mono">{{ vlan.vlannumber }}</td>
                <td>{{ vlan.name }}</td>
                <td>
                  <span v-if="vlan.vlantype" class="badge" :class="getTypeClass(vlan.vlantype)">
                    {{ vlan.vlantype }}
                  </span>
                  <span v-else>-</span>
                </td>
                <td class="cell-truncate" :title="vlan.description">{{ vlan.description || '-' }}</td>
                <td>
                  <router-link
                    :to="{ path: '/settings/subnets', query: { vlanid: vlan.vlanid } }"
                    class="subnet-link"
                  >
                    View Subnets
                  </router-link>
                </td>
                <td class="actions">
                  <button
                    class="btn btn-secondary btn-sm"
                    @click="openModal(vlan)"
                  >
                    Edit
                  </button>
                  <button
                    class="btn btn-danger btn-sm"
                    @click="confirmDelete(vlan)"
                  >
                    Delete
                  </button>
                </td>
              </tr>
              <tr v-if="vlans.length === 0">
                <td colspan="6" style="text-align: center; color: var(--text-light);">
                  No VLANs found
                </td>
              </tr>
            </tbody>
          </table>
        </div>

        <!-- Pagination -->
        <PaginationBar
          :page="page"
          :totalPages="totalPages"
          :perPage="perPage"
          @update:page="goToPage"
          @update:perPage="changePerPage"
        />
      </template>
    </div>

    <!-- Add/Edit Modal -->
    <div v-if="showModal" class="modal-overlay">
      <div class="modal">
        <div class="modal-header">
          <h3>{{ editingVLAN ? 'Edit VLAN' : 'Add VLAN' }}</h3>
        </div>
        <form @submit.prevent="saveVLAN">
          <div class="modal-body">
            <div class="form-row">
              <div class="form-group">
                <label for="vlannumber">VLAN Number *</label>
                <input
                  id="vlannumber"
                  v-model.number="form.vlannumber"
                  type="number"
                  class="form-control"
                  min="1"
                  max="4094"
                  required
                />
              </div>

              <div class="form-group">
                <label for="name">Name *</label>
                <input
                  id="name"
                  v-model="form.name"
                  type="text"
                  class="form-control"
                  required
                />
              </div>
            </div>

            <div class="form-group">
              <label for="vlantype">VLAN Type</label>
              <select id="vlantype" v-model="form.vlantype" class="form-control">
                <option value="">Select Type</option>
                <option value="data">Data</option>
                <option value="voice">Voice</option>
                <option value="management">Management</option>
                <option value="guest">Guest</option>
                <option value="iot">IoT</option>
              </select>
            </div>

            <div class="form-group">
              <label for="description">Description</label>
              <textarea
                id="description"
                v-model="form.description"
                class="form-control"
                rows="3"
              ></textarea>
            </div>

            <div v-if="error" class="error-message">{{ error }}</div>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-secondary" @click="closeModal">Cancel</button>
            <button type="submit" class="btn btn-primary" :disabled="saving">
              {{ saving ? 'Saving...' : 'Save' }}
            </button>
          </div>
        </form>
      </div>
    </div>

    <!-- Delete Confirmation Modal -->
    <div v-if="showDeleteModal" class="modal-overlay" @click.self="showDeleteModal = false">
      <div class="modal">
        <div class="modal-header">
          <h3>Delete VLAN</h3>
        </div>
        <div class="modal-body">
          <p>Are you sure you want to delete VLAN <strong>{{ vlanToDelete?.vlannumber }} ({{ vlanToDelete?.name }})</strong>?</p>
          <p style="color: var(--text-light); font-size: 0.875rem;">
            VLANs with associated subnets cannot be deleted.
          </p>
        </div>
        <div class="modal-footer">
          <button class="btn btn-secondary" @click="showDeleteModal = false">Cancel</button>
          <button class="btn btn-danger" @click="deleteVLAN">Delete</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { networkApi } from '@/api'
import PaginationBar from '@/components/PaginationBar.vue'
import { useToast } from '@/composables/toast'
import { apiError } from '@/utils/apiError'
import { useListQuery } from '@/composables/listQuery'
const toast = useToast()

const vlans = ref([])
const loading = ref(true)
const { page, search, setPage, setSearch } = useListQuery({ onChange: loadVLANs })
const typeFilter = ref('')
const totalPages = ref(1)
const perPage = ref(20)

const showModal = ref(false)
const editingVLAN = ref(null)
const saving = ref(false)
const error = ref('')

const showDeleteModal = ref(false)
const vlanToDelete = ref(null)

const form = ref({
  vlannumber: null,
  name: '',
  vlantype: '',
  description: ''
})

let searchTimeout = null

onMounted(() => {
  loadVLANs()
})

// A filter change must go back to page 1. Selecting a filter while on page 5
// asked the server for page 5 of a result set that now has one page, and the
// list came back empty as though the filter matched nothing.
//
// setPage(1) writes the URL, which the composable's watcher picks up and
// answers with onChange - so calling the loader as well would fetch twice.
// Load directly only when already on page 1, where nothing changes and the
// watcher stays silent.
function applyFilter() {
  if (page.value > 1) setPage(1)
  else loadVLANs()
}

async function loadVLANs() {
  loading.value = true
  try {
    const params = {
      page: page.value,
      perpage: perPage.value
    }
    if (search.value) params.search = search.value
    if (typeFilter.value) params.type = typeFilter.value

    const response = await networkApi.vlans.list(params)
    vlans.value = response.data.data || []
    totalPages.value = response.data.meta?.pagination?.totalpages || response.data.meta?.pagination?.total_pages || 1
  } catch (err) {
    console.error('Error loading VLANs:', err)
  } finally {
    loading.value = false
  }
}

function debouncedSearch() {
  clearTimeout(searchTimeout)
  searchTimeout = setTimeout(() => {
    setSearch(search.value)
    loadVLANs()
  }, 300)
}

function goToPage(p) {
  setPage(p)
  loadVLANs()
}

function changePerPage(newPerPage) {
  perPage.value = newPerPage
  setPage(1)
  loadVLANs()
}

function getTypeClass(type) {
  switch (type) {
    case 'data': return 'badge-info'
    case 'voice': return 'badge-success'
    case 'management': return 'badge-warning'
    case 'guest': return 'badge-secondary'
    case 'iot': return 'badge-primary'
    default: return 'badge-info'
  }
}

function openModal(vlan = null) {
  editingVLAN.value = vlan
  if (vlan) {
    form.value = {
      vlannumber: vlan.vlannumber,
      name: vlan.name || '',
      vlantype: vlan.vlantype || '',
      description: vlan.description || ''
    }
  } else {
    form.value = {
      vlannumber: null,
      name: '',
      vlantype: '',
      description: ''
    }
  }
  error.value = ''
  showModal.value = true
}

function closeModal() {
  showModal.value = false
  editingVLAN.value = null
}

async function saveVLAN() {
  error.value = ''
  saving.value = true

  try {
    if (editingVLAN.value) {
      await networkApi.vlans.update(editingVLAN.value.vlanid, form.value)
    } else {
      await networkApi.vlans.create(form.value)
    }
    closeModal()
    loadVLANs()
  } catch (err) {
    console.error('Error saving VLAN:', err)
    error.value = apiError(err, 'Failed to save VLAN')
  } finally {
    saving.value = false
  }
}

function confirmDelete(vlan) {
  vlanToDelete.value = vlan
  showDeleteModal.value = true
}

async function deleteVLAN() {
  try {
    await networkApi.vlans.delete(vlanToDelete.value.vlanid)
    showDeleteModal.value = false
    vlanToDelete.value = null
    loadVLANs()
  } catch (err) {
    console.error('Error deleting VLAN:', err)
    toast.error(apiError(err, 'Failed to delete VLAN'))
  }
}
</script>

<style scoped>
.mono {
  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 1rem;
}

.filters {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.filters select {
  width: auto;
  min-width: 150px;
}

.subnet-link {
  color: var(--link);
  text-decoration: none;
}

.subnet-link:hover {
  text-decoration: underline;
}

.badge-primary {
  background: var(--primary);
  color: white;
}

.badge-secondary {
  background: var(--secondary);
  color: var(--text);
}
</style>
