/**
 * 生成默认的 BPMN 流程图 XML
 *
 * 历史问题：这里原本只生成一个空的 <bpmn2:process>，没有任何节点，
 * 打开「流程模型 → 修改 → 流程设计」时画布一片空白，客户反馈「没有流程模型，需要配置一下」。
 *
 * 现改为生成一个可用的最小流程骨架：发起人 → 审批人 → 结束，
 * 客户打开即可在画布上直接选中节点配置审批人，或继续增删节点。
 * 注意：审批节点故意不预置办理人，由客户在右侧属性面板里选择。
 */
function defaultEmpty(key, name, type) {
  if (!type) type = 'camunda';
  const TYPE_TARGET = {
    activiti: 'http://activiti.org/bpmn',
    camunda: 'http://bpmn.io/schema/bpmn',
    flowable: 'http://flowable.org/bpmn',
  };
  // 扩展属性（如 flowable:assignee）的命名空间，camunda 与 bpmn.io 的 targetNamespace 不同
  const TYPE_EXTENSION_NS = {
    activiti: 'http://activiti.org/bpmn',
    camunda: 'http://camunda.org/schema/1.0/bpmn',
    flowable: 'http://flowable.org/bpmn',
  };
  return `<?xml version="1.0" encoding="UTF-8"?>
<bpmn2:definitions
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL"
  xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
  xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"
  xmlns:di="http://www.omg.org/spec/DD/20100524/DI"
  xmlns:${type}="${TYPE_EXTENSION_NS[type]}"
  id="diagram_${key}"
  targetNamespace="${TYPE_TARGET[type]}">
  <bpmn2:process id="${key}" name="${name}" isExecutable="true">
    <bpmn2:startEvent id="StartEvent_1" name="发起人">
      <bpmn2:outgoing>Flow_1</bpmn2:outgoing>
    </bpmn2:startEvent>
    <bpmn2:sequenceFlow id="Flow_1" sourceRef="StartEvent_1" targetRef="Activity_1" />
    <bpmn2:userTask id="Activity_1" name="审批人">
      <bpmn2:incoming>Flow_1</bpmn2:incoming>
      <bpmn2:outgoing>Flow_2</bpmn2:outgoing>
    </bpmn2:userTask>
    <bpmn2:sequenceFlow id="Flow_2" sourceRef="Activity_1" targetRef="EndEvent_1" />
    <bpmn2:endEvent id="EndEvent_1" name="结束">
      <bpmn2:incoming>Flow_2</bpmn2:incoming>
    </bpmn2:endEvent>
  </bpmn2:process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="${key}">
      <bpmndi:BPMNShape id="StartEvent_1_di" bpmnElement="StartEvent_1">
        <dc:Bounds x="180" y="160" width="36" height="36" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="187" y="203" width="22" height="14" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="Activity_1_di" bpmnElement="Activity_1">
        <dc:Bounds x="280" y="138" width="100" height="80" />
        <bpmndi:BPMNLabel />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="EndEvent_1_di" bpmnElement="EndEvent_1">
        <dc:Bounds x="432" y="160" width="36" height="36" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="439" y="203" width="22" height="14" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="Flow_1_di" bpmnElement="Flow_1">
        <di:waypoint x="216" y="178" />
        <di:waypoint x="280" y="178" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="Flow_2_di" bpmnElement="Flow_2">
        <di:waypoint x="380" y="178" />
        <di:waypoint x="432" y="178" />
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</bpmn2:definitions>`;
}

export default defaultEmpty;