<template>
  <div class="hospitals-container">
    <el-card>
      <!-- Header / Actions -->
      <div class="header-actions">
        <el-form :inline="true" :model="searchForm" class="search-form">
          <el-form-item label="医院名称">
            <el-input v-model="searchForm.keyword" placeholder="请输入关键词" clearable />
          </el-form-item>
          <el-form-item>
            <el-button type="primary" @click="fetchData" icon="Search">查询</el-button>
            <el-button @click="resetSearch" icon="Refresh">重置</el-button>
            <el-button v-if="userStore.role === 'SYSTEM_ADMIN'" type="success" @click="openCreateDialog" icon="Plus">新增医院</el-button>
          </el-form-item>
        </el-form>
      </div>

      <!-- Table -->
      <el-table :data="tableData" v-loading="loading" border stripe style="width: 100%">
        <el-table-column prop="id" label="ID" width="80" align="center" />
        <el-table-column prop="name" label="医院名称" min-width="200" />
        <el-table-column prop="adminDisplay" label="医院管理员" min-width="220">
          <template #default="{ row }">
            {{ row.adminDisplay || '未设置' }}
          </template>
        </el-table-column>
        <el-table-column prop="createdAt" label="创建时间" width="180">
          <template #default="{ row }">
            {{ new Date(row.createdAt).toLocaleString() }}
          </template>
        </el-table-column>
        <el-table-column label="操作" width="250" fixed="right" align="center">
          <template #default="{ row }">
            <el-button size="small" @click="goToDepartments(row)">管理科室</el-button>
            <el-button size="small" type="primary" @click="openEditDialog(row)">编辑</el-button>
            <el-button v-if="userStore.role === 'SYSTEM_ADMIN'" size="small" type="danger" @click="handleDelete(row)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>

      <!-- Pagination -->
      <div class="pagination-container">
        <el-pagination
          v-model:current-page="page"
          v-model:page-size="pageSize"
          :page-sizes="[10, 20, 50, 100]"
          :total="total"
          background
          layout="total, sizes, prev, pager, next, jumper"
          @size-change="fetchData"
          @current-change="fetchData"
        />
      </div>
    </el-card>

    <!-- Dialog for Create / Edit -->
    <el-dialog :title="isEdit ? '编辑医院' : '新增医院'" v-model="dialogVisible" width="500px" @close="resetForm">
      <el-form :model="form" :rules="rules" ref="formRef" label-width="100px">
        <el-form-item label="医院名称" prop="name">
          <el-input v-model="form.name" placeholder="请输入医院名称" />
        </el-form-item>
        <el-form-item label="医院管理员" v-if="userStore.role === 'SYSTEM_ADMIN'">
          <el-select
            v-model="form.adminUserId"
            placeholder="可选：选择后将任命为医院管理员"
            clearable
            filterable
            style="width: 100%;"
          >
            <el-option
              v-for="user in hospitalAdminOptions"
              :key="user.id"
              :label="`${user.name}（${user.phone} / ${getRoleName(user.role)}）`"
              :value="user.id"
            />
          </el-select>
        </el-form-item>
      </el-form>
      <template #footer>
        <div class="dialog-footer">
          <el-button @click="dialogVisible = false">取消</el-button>
          <el-button type="primary" @click="handleSubmit" :loading="submitLoading">确定</el-button>
        </div>
      </template>
    </el-dialog>
  </div>
</template>

<script setup>
import { ref, reactive, onMounted } from 'vue';
import { useRouter } from 'vue-router';
import { ElMessage, ElMessageBox } from 'element-plus';
import { getHospitals, createHospital, updateHospital, deleteHospital } from '../../api/organization';
import { getUsers, updateUser } from '../../api/users';
import { useUserStore } from '../../store/user';

const router = useRouter();
const userStore = useUserStore();

// --- State ---
const loading = ref(false);
const tableData = ref([]);
const total = ref(0);
const page = ref(1);
const pageSize = ref(10);
const hospitalAdminOptions = ref([]);

const roleMap = {
  SYSTEM_ADMIN: '系统管理员',
  HOSPITAL_ADMIN: '医院管理员',
  DIRECTOR: '科室主任',
  LEADER: '小组组长',
  DOCTOR: '医生',
  ENGINEER: '工程师',
};

const getRoleName = (role) => roleMap[role] || role;

const searchForm = reactive({
  keyword: ''
});

// Dialog State
const dialogVisible = ref(false);
const isEdit = ref(false);
const submitLoading = ref(false);
const formRef = ref(null);
const currentId = ref(null);

const form = reactive({
  name: '',
  adminUserId: null,
});

const rules = {
  name: [{ required: true, message: '请输入医院名称', trigger: 'blur' }]
};

// --- Methods ---
const fetchData = async () => {
  loading.value = true;
  try {
    const res = await getHospitals({
      page: page.value,
      pageSize: pageSize.value,
      keyword: searchForm.keyword || undefined
    });

    let hospitalAdminNameMap = {};
    try {
      const userRes = await getUsers();
      const users = Array.isArray(userRes?.list) ? userRes.list : [];
      hospitalAdminNameMap = users.reduce((acc, user) => {
        if (user.role !== 'HOSPITAL_ADMIN' || !user.hospitalId) {
          return acc;
        }
        if (!acc[user.hospitalId]) {
          acc[user.hospitalId] = [];
        }
        acc[user.hospitalId].push(user.name || '-');
        return acc;
      }, {});
    } catch (error) {
      console.error('Failed to fetch hospital admins', error);
    }

    tableData.value = (res.list || []).map((hospital) => ({
      ...hospital,
      adminDisplay: (hospitalAdminNameMap[hospital.id] || []).join('、') || '未设置',
    }));
    total.value = res.total || 0;
  } catch (error) {
    console.error('Failed to fetch hospitals', error);
  } finally {
    loading.value = false;
  }
};

const resetSearch = () => {
  searchForm.keyword = '';
  page.value = 1;
  fetchData();
};

const openCreateDialog = () => {
  isEdit.value = false;
  currentId.value = null;
  loadHospitalAdminOptions();
  dialogVisible.value = true;
};

const openEditDialog = (row) => {
  isEdit.value = true;
  currentId.value = row.id;
  form.name = row.name;
  loadHospitalAdminOptions(row.id);
  dialogVisible.value = true;
};

const resetForm = () => {
  if (formRef.value) {
    formRef.value.resetFields();
  }
  form.name = '';
  form.adminUserId = null;
};

const loadHospitalAdminOptions = async (hospitalId) => {
  if (userStore.role !== 'SYSTEM_ADMIN') {
    hospitalAdminOptions.value = [];
    return;
  }

  const userRes = await getUsers();
  const users = Array.isArray(userRes?.list) ? userRes.list : [];
  hospitalAdminOptions.value = users.filter((user) => {
    // 仅允许选择“医院管理员”角色，避免误选普通人员。
    if (user.role !== 'HOSPITAL_ADMIN') {
      return false;
    }
    if (!hospitalId) {
      return true;
    }
    return user.hospitalId == null || user.hospitalId === hospitalId;
  });
};

const handleSubmit = async () => {
  if (!formRef.value) return;
  await formRef.value.validate(async (valid) => {
    if (valid) {
      submitLoading.value = true;
      try {
        let targetHospitalId = null;
        if (isEdit.value) {
          const updated = await updateHospital(currentId.value, { name: form.name });
          targetHospitalId = updated?.id ?? currentId.value;
          ElMessage.success('更新成功');
        } else {
          const created = await createHospital({ name: form.name });
          targetHospitalId = created?.id;
          ElMessage.success('创建成功');
        }

        if (form.adminUserId && targetHospitalId) {
          const selectedAdmin = hospitalAdminOptions.value.find(
            (user) => user.id === form.adminUserId,
          );
          if (!selectedAdmin || selectedAdmin.role !== 'HOSPITAL_ADMIN') {
            ElMessage.error('仅可选择医院管理员角色人员');
            return;
          }

          await updateUser(form.adminUserId, {
            role: 'HOSPITAL_ADMIN',
            hospitalId: targetHospitalId,
            departmentId: null,
            groupId: null,
          });
          ElMessage.success('医院管理员已设置');
        }

        dialogVisible.value = false;
        fetchData();
      } catch (error) {
        console.error('Submit failed', error);
      } finally {
        submitLoading.value = false;
      }
    }
  });
};

const handleDelete = (row) => {
  ElMessageBox.confirm(
    `确定要删除医院 "${row.name}" 吗？`,
    '警告',
    {
      confirmButtonText: '确定',
      cancelButtonText: '取消',
      type: 'warning',
    }
  ).then(async () => {
    try {
      await deleteHospital(row.id);
      ElMessage.success('删除成功');
      fetchData();
    } catch (error) {
      console.error('Delete failed', error);
    }
  }).catch(() => {});
};

const goToDepartments = (row) => {
  router.push({
    path: '/organization/departments',
    query: { hospitalId: row.id, hospitalName: row.name }
  });
};

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

<style scoped>
.hospitals-container {
  padding: 0;
}
.header-actions {
  margin-bottom: 20px;
}
.pagination-container {
  margin-top: 20px;
  display: flex;
  justify-content: flex-end;
}
</style>
