package hhc_ast

import "git.swzry.com/zry/go-hhc-cli/hhc_common"

type SyntaxDefTreeNode interface {
	IsEnd() bool
	WalkNext(ctx *SDTWalkContext, token string) (SyntaxDefTreeNode, hhc_common.SDTWalkError)
	GetHelps(prefix string) []hhc_common.SDTHelpInfo
	Fallback(ctx *SDTWalkContext) (SyntaxDefTreeNode, hhc_common.SDTWalkError)
}

type SyntaxDefinitionTreeRoot struct {
	//Commands map[string]*SDTNode_Command
	Commands *SDT_TrieContainer
}

func (n *SyntaxDefinitionTreeRoot) IsEnd() bool {
	return false
}

func (n *SyntaxDefinitionTreeRoot) GetHelps(prefix string) []hhc_common.SDTHelpInfo {
	hi := make([]hhc_common.SDTHelpInfo, 0)
	if n.Commands != nil {
		kl := n.Commands.PrefixGetList(prefix)
		for _, v := range kl {
			hi = append(hi, hhc_common.SDTHelpInfo{
				IsArg:       false,
				Name:        v.Name,
				Description: v.Description,
			})
		}
	}
	return hi
}

func (n *SyntaxDefinitionTreeRoot) WalkNext(ctx *SDTWalkContext, token string) (SyntaxDefTreeNode, hhc_common.SDTWalkError) {
	if n.Commands != nil {
		v, err := n.Commands.WalkUtil(token)
		if err != nil {
			return nil, err
		}
		if v != nil {
			ctx.ASTNodes = append(ctx.ASTNodes, ASTNode_Command{
				Name: v.Name,
			})
			return v, nil
		}
	}
	return nil, &hhc_common.SDTWalkError_UnrecognizedCommand{RelyToken: token}
}

func (n *SyntaxDefinitionTreeRoot) Fallback(ctx *SDTWalkContext) (SyntaxDefTreeNode, hhc_common.SDTWalkError) {
	return nil, hhc_common.SDTWalkError_RootNodeCannotFallback{}
}

func (n *SyntaxDefinitionTreeRoot) AddCommand(cmd *SDTNode_Command) *SyntaxDefinitionTreeRoot {
	if n.Commands == nil {
		n.Commands = NewSDT_TrieContainer()
	}
	n.Commands.Put(cmd)
	cmd.Parent = n
	return n
}