<template>
  <div>
    <div class="flex items-center justify-between mb-6">
      <h2 class="text-xl font-bold text-gray-800">系統管理</h2>
      <el-button type="primary" @click="showCreateDialog = true" :icon="Plus">新增系統</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="systems" stripe border class="w-full shadow-sm">
      <template #empty><el-empty description="目前無系統" /></template>
      <el-table-column prop="system_key" label="System Key" width="200" />
      <el-table-column prop="name" label="系統名稱" min-width="180" />
      <el-table-column prop="idp_client_id" label="Keycloak Client ID" min-width="200" />
      <el-table-column prop="status" label="狀態" width="110" />
      <el-table-column label="操作" width="280">
        <template #default="{ row }">
          <el-button size="small" @click="openEdit(row)">編輯</el-button>
          <el-button size="small" @click="openRoles(row)">角色</el-button>
          <el-button size="small" type="danger" @click="handleDelete(row)">刪除</el-button>
        </template>
      </el-table-column>
    </el-table>

    <el-dialog v-model="showCreateDialog" title="新增系統" width="620px" @close="resetCreateForm">
      <el-form ref="createFormRef" :model="createForm" :rules="rules" label-width="160px">
        <el-form-item label="系統名稱" prop="name"><el-input v-model="createForm.name" /></el-form-item>
        <el-form-item label="Keycloak Client ID" prop="idp_client_id"><el-input v-model="createForm.idp_client_id" /></el-form-item>
        <el-form-item label="狀態">
          <el-select v-model="createForm.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="showCreateDialog = false">取消</el-button>
        <el-button type="primary" :loading="creating" @click="handleCreate">建立</el-button>
      </template>
    </el-dialog>

    <el-dialog v-model="showEditDialog" title="編輯系統" width="620px" @close="resetEditForm">
      <el-form :model="editForm" label-width="160px">
        <el-form-item label="System Key"><el-input :model-value="editForm.system_key" disabled /></el-form-item>
        <el-form-item label="系統名稱"><el-input v-model="editForm.name" /></el-form-item>
        <el-form-item label="Keycloak Client ID"><el-input v-model="editForm.idp_client_id" /></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="saving" @click="handleEdit">儲存</el-button>
      </template>
    </el-dialog>

    <el-dialog v-model="showRolesDialog" :title="`系統角色：${selectedSystemLabel}`" width="980px">
      <el-table :data="systemRoles" border stripe v-loading="rolesLoading">
        <template #empty><el-empty description="此系統目前沒有角色" /></template>
        <el-table-column prop="role_key" label="Role Key" width="200" />
        <el-table-column prop="name" label="角色名稱" min-width="200" />
        <el-table-column prop="idp_role_name" label="Keycloak Role" min-width="210" />
        <el-table-column prop="status" label="狀態" width="110" />
      </el-table>
      <template #footer>
        <el-button @click="showRolesDialog = false">關閉</el-button>
      </template>
    </el-dialog>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { ElMessage, ElMessageBox } from 'element-plus'
import { Plus } from '@element-plus/icons-vue'
import { getSystems, createSystem, updateSystem, deleteSystem, getSystemRoles } from '@/api/systems'

const systems = ref([])
const loading = ref(false)
const error = ref(false)
const errorMsg = ref('')

const showCreateDialog = ref(false)
const showEditDialog = ref(false)
const creating = ref(false)
const saving = ref(false)
const createFormRef = ref()

const createForm = ref({ name: '', idp_client_id: '', status: 'active' })
const editForm = ref({ system_key: '', name: '', idp_client_id: '', status: 'active' })
const rules = {
  name: [{ required: true, message: '請輸入系統名稱', trigger: 'blur' }],
  idp_client_id: [{ required: true, message: '請輸入 Keycloak Client ID', trigger: 'blur' }]
}

const showRolesDialog = ref(false)
const selectedSystemLabel = ref('')
const systemRoles = ref([])
const rolesLoading = ref(false)

async function load() {
  loading.value = true
  error.value = false
  try {
    const res = await getSystems()
    systems.value = res.data?.items || []
  } catch (err) {
    error.value = true
    errorMsg.value = err.response?.data?.detail || '載入系統失敗'
  } finally {
    loading.value = false
  }
}

function resetCreateForm() {
  createForm.value = { name: '', idp_client_id: '', status: 'active' }
}

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

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

async function handleCreate() {
  const valid = await createFormRef.value.validate().catch(() => false)
  if (!valid) return
  creating.value = true
  try {
    await createSystem(createForm.value)
    ElMessage.success('新增系統成功')
    showCreateDialog.value = false
    resetCreateForm()
    await load()
  } catch (err) {
    ElMessage.error(err.response?.data?.detail || '新增系統失敗')
  } finally {
    creating.value = false
  }
}

async function handleEdit() {
  saving.value = true
  try {
    await updateSystem(editForm.value.system_key, {
      name: editForm.value.name,
      idp_client_id: editForm.value.idp_client_id,
      status: editForm.value.status
    })
    ElMessage.success('更新成功')
    showEditDialog.value = false
    await load()
  } catch (err) {
    ElMessage.error(err.response?.data?.detail || '更新系統失敗')
  } finally {
    saving.value = false
  }
}

async function handleDelete(row) {
  try {
    await ElMessageBox.confirm(
      `確認刪除系統 ${row.name}（${row.system_key}）？`,
      '刪除確認',
      { type: 'warning' }
    )
    await deleteSystem(row.system_key)
    ElMessage.success('刪除成功')
    await load()
  } catch (err) {
    if (err === 'cancel') return
    ElMessage.error(err.response?.data?.detail || '刪除系統失敗')
  }
}

async function openRoles(row) {
  selectedSystemLabel.value = `${row.name} (${row.system_key})`
  showRolesDialog.value = true
  rolesLoading.value = true
  try {
    const res = await getSystemRoles(row.system_key)
    systemRoles.value = res.data?.roles || []
  } catch (_err) {
    ElMessage.error('載入系統角色失敗')
    systemRoles.value = []
  } finally {
    rolesLoading.value = false
  }
}

onMounted(load)
</script>
