<template>
  <div>
    <!-- Header -->
    <div class="flex justify-between items-center mb-6">
      <h1 class="text-2xl font-bold text-primary-600">จัดการผู้ใช้งาน</h1>
      <div class="flex gap-3">
        <!-- <q-btn
          outline
          color="red"
          label="ส่งออก Excel"
          icon="download"
          @click="exportExcel"
        /> -->
        <!-- <q-btn
          color="primary"  
          label="+ เพิ่มผู้ใช้ใหม่"
          @click="showAddModal = true"
        /> -->
      </div>
    </div>

    <!-- Search and Filter -->
    <div class="bg-white rounded-xl shadow-sm p-4 mb-6">
      <div class="grid grid-cols-1 md:grid-cols-4 gap-4">
        <div class="md:col-span-3">
          <q-input
            v-model="searchQuery"
            placeholder="ค้นหาชื่อ, อีเมล, username..."
            outlined
            dense
            bg-color="grey-1"
          >
            <template v-slot:prepend>
              <q-icon name="search" />
            </template>
          </q-input>
        </div>
        
        <q-select
          v-model="filterRole"
          :options="roleOptions"
          outlined
          dense
          emit-value
          map-options
        />
      </div>
    </div>

    <!-- Stats Cards -->
    <div class="grid grid-cols-2 md:grid-cols-4 gap-4 mb-6">
      <div class="bg-white rounded-xl shadow-sm p-6 text-center">
        <div class="text-4xl font-bold text-primary-600">{{ stats.total.toLocaleString() }}</div>
        <div class="text-gray-500 mt-1">ผู้ใช้ทั้งหมด</div>
      </div>
      <div class="bg-white rounded-xl shadow-sm p-6 text-center">
        <div class="text-4xl font-bold text-gray-700">{{ stats.admin }}</div>
        <div class="text-gray-500 mt-1">Admin</div>
      </div>
      <div class="bg-white rounded-xl shadow-sm p-6 text-center">
        <div class="text-4xl font-bold text-gray-700">{{ stats.instructor }}</div>
        <div class="text-gray-500 mt-1">Instructor</div>
      </div>
      <div class="bg-white rounded-xl shadow-sm p-6 text-center">
        <div class="text-4xl font-bold text-gray-700">{{ stats.student.toLocaleString() }}</div>
        <div class="text-gray-500 mt-1">Student</div>
      </div>
    </div>

    <!-- Users Table -->
    <div class="bg-white rounded-xl shadow-sm overflow-hidden">
      <q-table
        :rows="filteredUsers"
        :columns="columns"
        row-key="id"
        :loading="loading"
        flat
        :pagination="pagination"
        :rows-per-page-options="[5, 10, 20, 50, 0]"
        @update:pagination="pagination = $event"
      >
        <!-- User Info -->
        <template v-slot:body-cell-user="props">
          <q-td :props="props">
            <div class="flex items-center gap-3">
              <div class="w-10 h-10 rounded-full overflow-hidden flex items-center justify-center bg-primary-100">
                <img 
                  v-if="props.row.avatar_url || props.row.profile?.avatar_url" 
                  :src="props.row.avatar_url || props.row.profile?.avatar_url" 
                  class="w-full h-full object-cover"
                  alt="Avatar"
                />
                <q-icon v-else name="person" color="primary" />
              </div>
              <div>
                <div class="font-medium text-primary-600 hover:underline cursor-pointer">
                  {{ getFullName(props.row) }}
                </div>
                <div class="text-sm text-gray-500">{{ props.row.email }}</div>
              </div>
            </div>
          </q-td>
        </template>

        <!-- Role Badge -->
        <template v-slot:body-cell-role="props">
          <q-td :props="props">
            <q-badge 
              :color="getRoleBadgeColor(props.row.role.code)"
              :label="props.row.role.name.th"
              class="px-3 py-1"
            />
          </q-td>
        </template>

        <!-- Date -->
        <template v-slot:body-cell-created_at="props">
          <q-td :props="props">
            {{ formatDate(props.row.created_at) }}
          </q-td>
        </template>

        <!-- Actions -->
        <template v-slot:body-cell-actions="props">
          <q-td :props="props">
            <q-btn flat round dense icon="more_vert">
              <q-menu>
                <q-list style="min-width: 150px">
                  <q-item clickable v-close-popup @click="viewUser(props.row)">
                    <q-item-section avatar>
                      <q-icon name="visibility" color="grey" />
                    </q-item-section>
                    <q-item-section>ดู</q-item-section>
                  </q-item>
                  <q-item clickable v-close-popup @click="changeRole(props.row)">
                    <q-item-section avatar>
                      <q-icon name="swap_horiz" color="primary" />
                    </q-item-section>
                    <q-item-section>แก้ Role</q-item-section>
                  </q-item>
                  <q-separator />
                  <q-item clickable v-close-popup @click="confirmDelete(props.row)">
                    <q-item-section avatar>
                      <q-icon name="delete" color="negative" />
                    </q-item-section>
                    <q-item-section class="text-negative">ลบ</q-item-section>
                  </q-item>
                </q-list>
              </q-menu>
            </q-btn>
          </q-td>
        </template>
      </q-table>
    </div>

    <!-- View User Modal -->
    <q-dialog v-model="showViewModal">
      <q-card style="min-width: 500px">
        <q-card-section class="row items-center q-pb-none">
          <div class="text-h6">รายละเอียดผู้ใช้</div>
          <q-space />
          <q-btn icon="close" flat round dense @click="showViewModal = false" />
        </q-card-section>

        <q-card-section v-if="selectedUser">
          <!-- Avatar & Name -->
          <div class="flex items-center gap-4 mb-6">
            <div class="w-20 h-20 rounded-full overflow-hidden flex items-center justify-center bg-primary-100 text-3xl">
              <img 
                v-if="selectedUser.avatar_url || selectedUser.profile?.avatar_url" 
                :src="selectedUser.avatar_url || selectedUser.profile?.avatar_url" 
                class="w-full h-full object-cover"
                alt="Avatar"
              />
              <q-icon v-else name="person" color="primary" size="40px" />
            </div>
            <div>
              <div class="text-xl font-bold text-gray-900">
                {{ selectedUser.profile.prefix?.th }}{{ selectedUser.profile.first_name }} {{ selectedUser.profile.last_name }}
              </div>
              <div class="text-gray-500">@{{ selectedUser.username }}</div>
              <q-badge :color="getRoleBadgeColor(selectedUser.role.code)" class="mt-1">
                {{ selectedUser.role.name.th }}
              </q-badge>
            </div>
          </div>

          <!-- Info Grid -->
          <div class="grid grid-cols-2 gap-4">
            <div>
              <div class="text-sm text-gray-500">อีเมล</div>
              <div class="font-medium">{{ selectedUser.email }}</div>
            </div>
            <div>
              <div class="text-sm text-gray-500">เบอร์โทร</div>
              <div class="font-medium">{{ selectedUser.profile.phone || '-' }}</div>
            </div>
            <div>
              <div class="text-sm text-gray-500">วันที่ลงทะเบียน</div>
              <div class="font-medium">{{ formatDate(selectedUser.created_at) }}</div>
            </div>
            <div>
              <div class="text-sm text-gray-500">อัพเดทล่าสุด</div>
              <div class="font-medium">{{ formatDate(selectedUser.updated_at) }}</div>
            </div>
          </div>
        </q-card-section>

        <q-card-actions align="right">
          <q-btn flat label="ปิด" color="primary" @click="showViewModal = false" />
        </q-card-actions>
      </q-card>
    </q-dialog>
  </div>
</template>

<script setup lang="ts">
import { useQuasar } from 'quasar';
import { adminService, type AdminUserResponse } from '~/services/admin.service';

definePageMeta({
  layout: 'admin',
  middleware: ['auth', 'admin']
});

const $q = useQuasar();

// Data
const users = ref<AdminUserResponse[]>([]);
const loading = ref(true);
const searchQuery = ref('');
const filterRole = ref<string | null>(null);
const showAddModal = ref(false);
const showViewModal = ref(false);
const selectedUser = ref<AdminUserResponse | null>(null);
const pagination = ref({
  page: 1,
  rowsPerPage: 10
});

// Table columns
const columns = [
  { name: 'user', label: 'ผู้ใช้งาน', field: 'user', align: 'left' as const },
  { name: 'role', label: 'บทบาท', field: 'role', align: 'center' as const },
  { name: 'created_at', label: 'ลงทะเบียน', field: 'created_at', align: 'center' as const },
  { name: 'actions', label: 'Actions', field: 'actions', align: 'center' as const }
];

// Filter options
const roleOptions = [
  { label: 'บทบาททั้งหมด', value: null },
  { label: 'Instructor', value: 'INSTRUCTOR' },
  { label: 'Student', value: 'STUDENT' },
  { label: 'Admin', value: 'ADMIN' }
]

// Stats computed
const stats = computed(() => {
  const total = users.value.length;
  const admin = users.value.filter(u => u.role.code === 'ADMIN').length;
  const instructor = users.value.filter(u => u.role.code === 'INSTRUCTOR').length;
  const student = users.value.filter(u => u.role.code === 'STUDENT').length;
  return { total, admin, instructor, student };
});

// Filtered users
const filteredUsers = computed(() => {
  let result = users.value;

  if (searchQuery.value) {
    const query = searchQuery.value.toLowerCase();
    result = result.filter(user => 
      user.profile.first_name.toLowerCase().includes(query) ||
      user.profile.last_name.toLowerCase().includes(query) ||
      user.email.toLowerCase().includes(query) ||
      user.username.toLowerCase().includes(query)
    );
  }

  if (filterRole.value) {
    result = result.filter(user => user.role.code === filterRole.value);
  }

  return result;
});

// Methods
const fetchUsers = async () => {
  loading.value = true;
  try {
    users.value = await adminService.getUsers();
  } catch (error) {
    $q.notify({
      type: 'negative',
      message: (error as any).data?.message || 'ไม่สามารถโหลดข้อมูลผู้ใช้ได้',
      position: 'top'
    });
  } finally {
    loading.value = false;
  }
};

const getFullName = (user: AdminUserResponse) => {
  const prefix = user.profile.prefix?.th || '';
  return `${prefix}${user.profile.first_name} ${user.profile.last_name}`;
};

const getRoleBadgeColor = (roleCode: string) => {
  const colors: Record<string, string> = {
    ADMIN: 'red',
    INSTRUCTOR: 'orange',
    STUDENT: 'blue'
  };
  return colors[roleCode] || 'grey';
};

const formatDate = (date: string) => {
  return new Date(date).toLocaleDateString('th-TH', {
    day: 'numeric',
    month: 'short',
    year: '2-digit'
  });
};

const viewUser = (user: AdminUserResponse) => {
  selectedUser.value = user;
  showViewModal.value = true;
};

const changeRole = (user: AdminUserResponse) => {
  const roleIds: Record<string, number> = {
    INSTRUCTOR: 1,
    STUDENT: 2,
    ADMIN: 3
  };
  
  $q.dialog({
    title: 'เปลี่ยน Role',
    message: `เลือก Role ใหม่สำหรับ ${user.profile.first_name}`,
    options: {
      type: 'radio',
      model: roleIds[user.role.code] as any,
      items: [
        { label: 'Instructor', value: 1 },
        { label: 'Student', value: 2 },
        { label: 'Admin', value: 3 }
      ]
    },
    cancel: true,
    persistent: true
  }).onOk(async (roleId: number) => {
    try {
      const response = await adminService.updateUserRole(user.id, roleId);
      $q.notify({
        type: 'positive',
        message: response.message || 'เปลี่ยน Role สำเร็จ',
        position: 'top'
      });
      fetchUsers();
    } catch (error: any) {
      $q.notify({
        type: 'negative',
        message: error.data?.message || 'เกิดข้อผิดพลาดในการเปลี่ยน Role',
        position: 'top'
      });
    }
  });
};

const confirmDelete = (user: AdminUserResponse) => {
  $q.dialog({
    title: 'ยืนยันการลบ',
    message: `คุณต้องการลบผู้ใช้ "${user.profile.first_name} ${user.profile.last_name}" หรือไม่?`,
    cancel: true,
    persistent: true
  }).onOk(async () => {
    try {
      const response = await adminService.deleteUser(user.id);
      $q.notify({
        type: 'positive',
        message: response.message || 'ลบผู้ใช้สำเร็จ',
        position: 'top'
      });
      fetchUsers();
    } catch (error: any) {
      $q.notify({
        type: 'negative',
        message: error.data?.message || 'เกิดข้อผิดพลาดในการลบผู้ใช้',
        position: 'top'
      });
    }
  });
};

const exportExcel = () => {
  $q.notify({
    type: 'info',
    message: 'กำลังส่งออกไฟล์ Excel...',
    position: 'top'
  });
};

// Lifecycle
onMounted(() => {
  fetchUsers();
});
</script>
