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

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

      <template v-else>
        <div class="table-container">
          <table>
            <thead>
              <tr>
                <th>Business Unit</th>
                <th>Code</th>
                <th>Description</th>
                <th>Actions</th>
              </tr>
            </thead>
            <tbody>
              <tr v-for="bu in items" :key="bu.businessunitid">
                <td>{{ bu.businessunit }}</td>
                <td>{{ bu.code || '-' }}</td>
                <td class="cell-truncate" :title="bu.description">{{ bu.description || '-' }}</td>
                <td class="actions">
                  <button class="btn btn-secondary btn-sm" @click="openModal(bu)">Edit</button>
                  <button class="btn btn-danger btn-sm" @click="confirmDelete(bu)">Delete</button>
                </td>
              </tr>
              <tr v-if="items.length === 0">
                <td colspan="4" style="text-align: center; color: var(--text-light);">
                  No business units 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" @click.self="closeModal">
      <div class="modal">
        <div class="modal-header">
          <h3>{{ editing ? 'Edit Business Unit' : 'Add Business Unit' }}</h3>
        </div>
        <form @submit.prevent="save">
          <div class="modal-body">
            <div class="form-group">
              <label for="businessunit">Business Unit Name *</label>
              <input id="businessunit" v-model="form.businessunit" type="text" class="form-control" required />
            </div>
            <div class="form-group">
              <label for="code">Code</label>
              <input id="code" v-model="form.code" type="text" class="form-control" placeholder="e.g., ENGR, MFG" />
            </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 Modal -->
    <div v-if="showDeleteModal" class="modal-overlay" @click.self="showDeleteModal = false">
      <div class="modal">
        <div class="modal-header"><h3>Delete Business Unit</h3></div>
        <div class="modal-body">
          <p>Are you sure you want to delete <strong>{{ toDelete?.businessunit }}</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 { businessunitsApi } from '../../api'
import PaginationBar from '../../components/PaginationBar.vue'

const items = ref([])
const loading = ref(true)
const page = ref(1)
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({ businessunit: '', code: '', description: '' })

onMounted(() => loadData())

async function loadData() {
  loading.value = true
  try {
    const response = await businessunitsApi.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 business units:', err)
  } finally {
    loading.value = false
  }
}

function goToPage(p) { page.value = p; loadData() }

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

function openModal(item = null) {
  editing.value = item
  form.value = item ? {
    businessunit: item.businessunit || '',
    code: item.code || '',
    description: item.description || ''
  } : { businessunit: '', code: '', description: '' }
  error.value = ''
  showModal.value = true
}

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

async function save() {
  error.value = ''
  saving.value = true
  try {
    if (editing.value) {
      await businessunitsApi.update(editing.value.businessunitid, form.value)
    } else {
      await businessunitsApi.create(form.value)
    }
    closeModal()
    loadData()
  } catch (err) {
    error.value = err.response?.data?.message || 'Failed to save'
  } finally {
    saving.value = false
  }
}

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

async function deleteItem() {
  try {
    await businessunitsApi.delete(toDelete.value.businessunitid)
    showDeleteModal.value = false
    toDelete.value = null
    loadData()
  } catch (err) {
    alert('Failed to delete')
  }
}
</script>
