package approve_former

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

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

const (
	ApprovalModeAnd = "NEXT"
	ApprovalModeOr  = "OR"
)
const (
	ApprovalAssignTypeUser = "ASSIGN_USER"
	ApprovalAssignTypeRole = "ASSIGN_ROLE"
)

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(identifier, matter, createUserID, frontJson, argObj string) (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(&FlowBaseInfo{
		Identifier:     identifier,
		Matter:         matter,
		CreateUserID:   createUserID,
		BusinessObject: argObj,
	})
	root.Children.NodeLevel = 1
	root.Children.NamePrefix = "1-"
	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.Type)

	// 生成模板逻辑
	switch node.Type {
	case NodeTypeApproval:
		err := buildApprovalFlow(flow, node)
		if err != nil {
			return err
		}
	default:
		return errors.New("不支持的节点类型")
	}

	// 递归遍历并行分支节点
	for index, branch := range node.Branchs {
		branch.Children.NodeLevel = node.NodeLevel + 1
		branch.Children.NamePrefix = fmt.Sprintf("%d-%d-", branch.Children.NodeLevel, index)
		err := traverseTree(flow, branch.Children)
		if err != nil {
			return err
		}
	}

	// 递归遍历子节点
	if node.Children != nil {
		node.Children.NodeLevel = node.NodeLevel + 1
		node.Children.NamePrefix = fmt.Sprintf("%d-", node.Children.NodeLevel)
		err := traverseTree(flow, node.Children)
		if err != nil {
			return err
		}
	}

	return nil
}

func buildApprovalFlow(flow *Flow, node *Node) error {
	if node == nil {
		return nil
	}

	var (
		singleFlag bool
	)

	// 判断审批指定人员或者角色是否为1个，如果只有一个，无论审批模式是会签还是或签，逻辑都一样。
	switch node.Props.AssignedType {
	case ApprovalAssignTypeUser:
		if len(node.Props.AssignedUser) == 1 {
			singleFlag = true
		}
	case ApprovalAssignTypeRole:
		if len(node.Props.AssignedRole) == 1 {
			singleFlag = true
		}
	default:
		return errors.New("暂不支持的审批签名类型")
	}

	if singleFlag {
		flow.AddNodes(NewSequenceSign(fmt.Sprintf("%s%s", node.NamePrefix, node.ID)))
		return nil
	}

	switch node.Props.Mode {
	case ApprovalModeAnd:
	case ApprovalModeOr:
	default:
		return errors.New("暂不支持的审批模式")
	}

	return nil
}