package approve_former

import (
	"encoding/json"
	"fmt"
	"github.com/pkg/errors"
)

const (
	NodeTypeApproval = "APPROVAL" //审批节点类型
)

var (
	ErrNodeEmpty = errors.New("请最少设置一个流程节点")
)

// ParseFlowFromJson 解析当前云极和ERP使用的前端json格式,输出argo支持的模板字符串
func ParseFlowFromJson(flowName, frontJson string, argObj interface{}) (string, error) {
	var root Node
	err := json.Unmarshal([]byte(frontJson), &root)
	if err != nil {
		return "", err
	}
	if root.Children == nil {
		return "", ErrNodeEmpty
	}

	// 递归遍历流程节点，生成argo模板
	flow := NewFlow(flowName)
	err = traverseTree(flow, root.Children)
	if err != nil {
		return "", err
	}

	tmpStr, err := flow.Render(nil)
	if err != nil {
		return "", err
	}
	// 渲染模板
	return tmpStr, nil
}

func traverseTree(flow *Flow, node *Node) error {
	if node == nil {
		return nil
	}
	fmt.Printf("NodeID:%s,NodeName:%s,NodeType:%s\n", node.ID, node.Name, node.NodeType)

	// 生成模板逻辑
	switch node.Type {
	case NodeTypeApproval:

	default:
		return errors.New("不支持的节点类型")
	}

	// 递归遍历并行分支节点
	for _, branch := range node.Branchs {
		err := traverseTree(flow, branch.Children)
		if err != nil {
			return err
		}
	}

	// 递归遍历子节点
	if node.Children != nil {
		err := traverseTree(flow, node.Children)
		if err != nil {
			return err
		}
	}

	return nil
}