package com.iailab.module.bpm.framework.flowable.core.candidate.strategy.user;

import com.iailab.framework.common.util.collection.SetUtils;
import com.iailab.module.bpm.framework.flowable.core.candidate.BpmTaskCandidateStrategy;
import com.iailab.module.bpm.framework.flowable.core.enums.BpmTaskCandidateStrategyEnum;
import com.iailab.module.bpm.service.task.BpmProcessInstanceService;
import org.flowable.bpmn.model.BpmnModel;
import org.flowable.engine.delegate.DelegateExecution;
import org.flowable.engine.runtime.ProcessInstance;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Map;
import java.util.Set;

/**
 * 发起人自己 {@link BpmTaskCandidateUserStrategy} 实现类
 * <p>
 * 适合场景：用于需要发起人信息复核等场景
 *
 * @author hou
 */
@Component
public class BpmTaskCandidateStartUserStrategy implements BpmTaskCandidateStrategy {

    @Resource
    @Lazy // 延迟加载，避免循环依赖
    private BpmProcessInstanceService processInstanceService;

    @Override
    public BpmTaskCandidateStrategyEnum getStrategy() {
        return BpmTaskCandidateStrategyEnum.START_USER;
    }

    @Override
    public void validateParam(String param) {
    }

    @Override
    public boolean isParamRequired() {
        return false;
    }

    @Override
    public Set<Long> calculateUsersByTask(DelegateExecution execution, String param) {
        ProcessInstance processInstance = processInstanceService.getProcessInstance(execution.getProcessInstanceId());
        return SetUtils.asSet(Long.valueOf(processInstance.getStartUserId()));
    }

    @Override
    public Set<Long> calculateUsersByActivity(BpmnModel bpmnModel, String activityId, String param,
                                              Long startUserId, String processDefinitionId, Map<String, Object> processVariables) {
        return SetUtils.asSet(startUserId);
    }

}