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

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

      <template v-else>
        <div class="table-container">
          <table>
            <thead>
              <tr>
                <th>OS Name</th>
                <th>Version</th>
                <th>Architecture</th>
                <th>End of Life</th>
                <th>Actions</th>
              </tr>
            </thead>
            <tbody>
              <tr v-for="os in items" :key="os.osid">
                <td>{{ os.osname }}</td>
                <td>{{ os.osversion || '-' }}</td>
                <td>{{ os.architecture || '-' }}</td>
                <td>
                  <span v-if="os.endoflife" :class="{ 'text-danger': isPastEol(os.endoflife) }">
                    {{ os.endoflife }}
                  </span>
                  <span v-else>-</span>
                </td>
                <td class="actions">
                  <button class="btn btn-secondary btn-sm" @click="openModal(os)">Edit</button>
                  <button class="btn btn-danger btn-sm" @click="confirmDelete(os)">Delete</button>
                </td>
              </tr>
              <tr v-if="items.length === 0">
                <td colspan="5" style="text-align: center; color: var(--text-light);">
                  No operating systems 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>{{ editing ? 'Edit Operating System' : 'Add Operating System' }}</h3>
        </div>
        <form @submit.prevent="save">
          <div class="modal-body">
            <div class="form-group">
              <label for="osname">OS Name *</label>
              <input id="osname" v-model="form.osname" type="text" class="form-control" required placeholder="Windows 11" />
            </div>
            <div class="form-row">
              <div class="form-group">
                <label for="osversion">Version</label>
                <input id="osversion" v-model="form.osversion" type="text" class="form-control" placeholder="23H2" />
              </div>
              <div class="form-group">
                <label for="architecture">Architecture</label>
                <select id="architecture" v-model="form.architecture" class="form-control">
                  <option value="">Select...</option>
                  <option value="x64">x64</option>
                  <option value="x86">x86</option>
                  <option value="ARM64">ARM64</option>
                </select>
              </div>
            </div>
            <div class="form-group">
              <label for="endoflife">End of Life Date</label>
              <input id="endoflife" v-model="form.endoflife" type="date" class="form-control" />
            </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 Modal -->
    <div v-if="showDeleteModal" class="modal-overlay" @click.self="showDeleteModal = false">
      <div class="modal">
        <div class="modal-header"><h3>Delete Operating System</h3></div>
        <div class="modal-body">
          <p>Are you sure you want to delete <strong>{{ toDelete?.osname }}</strong>?</p>
        </div>
        <div class="modal-footer">
          <button class="btn btn-secondary" @click="showDeleteModal = false">Cancel</button>
          <button class="btn btn-danger" @click="deleteItem">Delete</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { operatingsystemsApi } 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 items = ref([])
const loading = ref(true)
const { page, setPage } = useListQuery({ onChange: loadData })
const totalPages = ref(1)
const perPage = ref(20)

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

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

const form = ref({ osname: '', osversion: '', architecture: '', endoflife: '' })

onMounted(() => loadData())

async function loadData() {
  loading.value = true
  try {
    const response = await operatingsystemsApi.list({ page: page.value, perpage: perPage.value })
    items.value = response.data.data || []
    totalPages.value = response.data.meta?.pagination?.totalpages || response.data.meta?.pagination?.total_pages || 1
  } catch (err) {
    console.error('Error loading operating systems:', err)
  } finally {
    loading.value = false
  }
}

function goToPage(p) { setPage(p); loadData() }

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

function isPastEol(date) {
  return new Date(date) < new Date()
}

function openModal(item = null) {
  editing.value = item
  form.value = item ? {
    osname: item.osname || '',
    osversion: item.osversion || '',
    architecture: item.architecture || '',
    endoflife: item.endoflife || ''
  } : { osname: '', osversion: '', architecture: '', endoflife: '' }
  error.value = ''
  showModal.value = true
}

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

async function save() {
  error.value = ''
  saving.value = true
  try {
    const data = { ...form.value }
    if (!data.endoflife) data.endoflife = null
    if (editing.value) {
      await operatingsystemsApi.update(editing.value.osid, data)
    } else {
      await operatingsystemsApi.create(data)
    }
    closeModal()
    loadData()
  } catch (err) {
    error.value = apiError(err, 'Failed to save')
  } finally {
    saving.value = false
  }
}

function confirmDelete(item) { toDelete.value = item; showDeleteModal.value = true }

async function deleteItem() {
  try {
    await operatingsystemsApi.delete(toDelete.value.osid)
    showDeleteModal.value = false
    toDelete.value = null
    loadData()
  } catch (err) {
    toast.error('Failed to delete')
  }
}
</script>

<style scoped>
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.text-danger {
  color: var(--danger);
  font-weight: 500;
}
</style>
