<template>
  <div>
    <div class="flex items-center justify-between mb-6">
      <h2 class="text-xl font-bold text-gray-800">模組管理</h2>
      <el-button type="primary" @click="showDialog = true" :icon="Plus">新增模組</el-button>
    </div>

    <el-alert
      v-if="error"
      :title="errorMsg"
      type="error"
      show-icon
      :closable="false"
      class="mb-4"
    />

    <el-skeleton v-if="loading" :rows="4" animated />

    <el-table v-else :data="modules" stripe border class="w-full shadow-sm">
      <template #empty><el-empty description="目前無模組" /></template>
      <el-table-column prop="system_key" label="System" width="140" />
      <el-table-column prop="module_key" label="Module Key" width="220" />
      <el-table-column prop="name" label="名稱" min-width="180" />
      <el-table-column prop="status" label="狀態" width="120" />
      <el-table-column label="操作" width="260">
        <template #default="{ row }">
          <el-button size="small" @click="openEdit(row)">編輯</el-button>
          <el-button size="small" @click="openRelations(row, 'groups')">群組</el-button>
          <el-button size="small" @click="openRelations(row, 'members')">會員</el-button>
        </template>
      </el-table-column>
    </el-table>

    <el-dialog v-model="showDialog" title="新增模組" @close="resetForm">
      <el-form ref="formRef" :model="form" :rules="rules" label-width="120px">
        <el-form-item label="System Key" prop="system_key">
          <el-select v-model="form.system_key" placeholder="選擇系統" filterable style="width: 100%">
            <el-option v-for="s in systems" :key="s.system_key" :label="`${s.name} (${s.system_key})`" :value="s.system_key" />
          </el-select>
        </el-form-item>
        <el-form-item label="名稱" prop="name">
          <el-input v-model="form.name" placeholder="行銷活動" />
        </el-form-item>
      </el-form>
      <template #footer>
        <el-button @click="showDialog = false">取消</el-button>
        <el-button type="primary" :loading="submitting" @click="handleCreate">確認</el-button>
      </template>
    </el-dialog>

    <el-dialog v-model="showEditDialog" title="編輯模組" @close="resetEditForm">
      <el-form :model="editForm" label-width="120px">
        <el-form-item label="Module Key">
          <el-input :model-value="editForm.module_key" disabled />
        </el-form-item>
        <el-form-item label="名稱">
          <el-input v-model="editForm.name" />
        </el-form-item>
        <el-form-item label="狀態">
          <el-select v-model="editForm.status" style="width: 100%">
            <el-option label="active" value="active" />
            <el-option label="inactive" value="inactive" />
          </el-select>
        </el-form-item>
      </el-form>
      <template #footer>
        <el-button @click="showEditDialog = false">取消</el-button>
        <el-button type="primary" :loading="savingEdit" @click="handleEdit">儲存</el-button>
      </template>
    </el-dialog>

    <el-dialog v-model="showRelationDialog" :title="`模組關聯：${relationModuleKey}`" width="900px">
      <el-tabs v-model="relationTab">
        <el-tab-pane label="所屬群組" name="groups">
          <el-table :data="relationGroups" border stripe v-loading="relationLoading">
            <template #empty><el-empty description="尚無關聯群組" /></template>
            <el-table-column prop="group_key" label="Group Key" width="220" />
            <el-table-column prop="group_name" label="名稱" min-width="220" />
            <el-table-column prop="status" label="狀態" width="120" />
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="涉及會員" name="members">
          <el-table :data="relationMembers" border stripe v-loading="relationLoading">
            <template #empty><el-empty description="尚無關聯會員" /></template>
            <el-table-column prop="authentik_sub" label="Authentik Sub" min-width="260" />
            <el-table-column prop="email" label="Email" min-width="220" />
            <el-table-column prop="display_name" label="顯示名稱" min-width="160" />
            <el-table-column label="啟用" width="80">
              <template #default="{ row }">{{ row.is_active ? '是' : '否' }}</template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
      <template #footer>
        <el-button @click="showRelationDialog = false">關閉</el-button>
      </template>
    </el-dialog>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { ElMessage } from 'element-plus'
import { Plus } from '@element-plus/icons-vue'
import { getModules, createModule, updateModule, getModuleGroups, getModuleMembers } from '@/api/modules'
import { getSystems } from '@/api/systems'

const modules = ref([])
const systems = ref([])
const loading = ref(false)
const error = ref(false)
const errorMsg = ref('')
const showDialog = ref(false)
const submitting = ref(false)
const formRef = ref()
const showEditDialog = ref(false)
const savingEdit = ref(false)

const form = ref({ system_key: '', name: '' })
const editForm = ref({ module_key: '', name: '', status: 'active' })
const rules = {
  system_key: [{ required: true, message: '請輸入 System Key', trigger: 'blur' }],
  name: [{ required: true, message: '請輸入名稱', trigger: 'blur' }]
}

const showRelationDialog = ref(false)
const relationLoading = ref(false)
const relationModuleKey = ref('')
const relationTab = ref('groups')
const relationGroups = ref([])
const relationMembers = ref([])

async function load() {
  loading.value = true
  error.value = false
  try {
    const [modulesRes, systemsRes] = await Promise.all([getModules(), getSystems()])
    modules.value = modulesRes.data?.items || []
    systems.value = systemsRes.data?.items || []
  } catch (err) {
    error.value = true
    errorMsg.value = err.response?.status === 422
      ? '缺少管理員 API 認證，請檢查前端 .env.development'
      : '載入失敗，請稍後再試'
  } finally {
    loading.value = false
  }
}

function resetForm() {
  form.value = { system_key: '', name: '' }
}

function openEdit(row) {
  editForm.value = {
    module_key: row.module_key,
    name: row.name,
    status: row.status || 'active'
  }
  showEditDialog.value = true
}

function resetEditForm() {
  editForm.value = { module_key: '', name: '', status: 'active' }
}

async function handleCreate() {
  const valid = await formRef.value.validate().catch(() => false)
  if (!valid) return
  submitting.value = true
  try {
    const res = await createModule(form.value)
    ElMessage.success(`新增成功：${res.data?.module_key || ''}`)
    showDialog.value = false
    resetForm()
    await load()
  } catch (err) {
    ElMessage.error('新增失敗，請稍後再試')
  } finally {
    submitting.value = false
  }
}

async function handleEdit() {
  savingEdit.value = true
  try {
    await updateModule(editForm.value.module_key, {
      name: editForm.value.name,
      status: editForm.value.status
    })
    ElMessage.success('更新成功')
    showEditDialog.value = false
    await load()
  } catch (err) {
    ElMessage.error('更新失敗')
  } finally {
    savingEdit.value = false
  }
}

async function openRelations(row, tab) {
  relationModuleKey.value = row.module_key
  relationTab.value = tab
  showRelationDialog.value = true
  relationLoading.value = true
  try {
    const [groupsRes, membersRes] = await Promise.all([
      getModuleGroups(row.module_key),
      getModuleMembers(row.module_key)
    ])
    relationGroups.value = groupsRes.data?.items || []
    relationMembers.value = membersRes.data?.items || []
  } catch (err) {
    ElMessage.error('載入模組關聯資料失敗')
  } finally {
    relationLoading.value = false
  }
}

onMounted(load)
</script>
