package hhc_ast

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

type SDTNode_Command struct {
	Name        string
	Description string
	Parent      SyntaxDefTreeNode
	//SubCommands map[string]*SDTNode_Command
	SubCommands  *SDT_TrieContainer
	ValArguments []*SDTNode_Argument
	End          *SDTNode_End
}

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

func (n *SDTNode_Command) WalkNext(ctx *SDTWalkContext, token string) (SyntaxDefTreeNode, hhc_common.SDTWalkError) {
	if token == "" {
		if n.End != nil {
			return n.End, nil
		} else {
			return nil, hhc_common.SDTWalkError_IncompleteCommand{}
		}
	}
	if n.SubCommands != nil {
		v, err := n.SubCommands.WalkUtil(token)
		if err != nil {
			return nil, err
		}
		if v != nil {
			ctx.ASTNodes = append(ctx.ASTNodes, ASTNode_Command{
				Name: v.Name,
			})
			return v, nil
		}
	}
	if n.ValArguments != nil {
		for i, v := range n.ValArguments {
			if v != nil {
				if v.Validate(token) {
					ctx.ASTNodes = append(ctx.ASTNodes, ASTNode_ValArg{
						RawToken: token,
					})
					return v, nil
				}
			} else {
				return nil, &hhc_common.SDTWalkError_NullPointerException{RelyToken: token, RelyEntity: "ValArguments[" + strconv.Itoa(i) + "]"}
			}
		}
	}
	return nil, hhc_common.SDTWalkError_UnrecognizedCommand{RelyToken: token}
}

func (n *SDTNode_Command) GetHelps(prefix string) []hhc_common.SDTHelpInfo {
	hi := make([]hhc_common.SDTHelpInfo, 0)
	if n.ValArguments != nil {
		for _, v := range n.ValArguments {
			hi = append(hi, hhc_common.SDTHelpInfo{
				IsArg:       true,
				Name:        v.FormatDescription,
				Description: v.Description,
			})
		}
	}
	if n.SubCommands != nil {
		kl := n.SubCommands.PrefixGetList(prefix)
		for _, v := range kl {
			hi = append(hi, hhc_common.SDTHelpInfo{
				IsArg:       false,
				Name:        v.Name,
				Description: v.Description,
			})
		}
	}
	if n.End != nil {
		hi = append(hi, hhc_common.SDTHelpInfo{
			IsArg:       true,
			Name:        "<cr>",
			Description: "",
		})
	}
	return hi
}

func (n *SDTNode_Command) Fallback(ctx *SDTWalkContext) (SyntaxDefTreeNode, hhc_common.SDTWalkError) {
	if n.Parent != nil {
		if len(ctx.ASTNodes) > 0 {
			ctx.ASTNodes = ctx.ASTNodes[:len(ctx.ASTNodes)-1]
		}
		return n.Parent, nil
	} else {
		return nil, hhc_common.SDTWalkError_LossingParent{RelyName: n.Name}
	}
}

func (n *SDTNode_Command) AddSubCommand(cmd *SDTNode_Command) *SDTNode_Command {
	if n.SubCommands == nil {
		n.SubCommands = NewSDT_TrieContainer()
	}
	n.SubCommands.Put(cmd)
	cmd.Parent = n
	return n
}

func (n *SDTNode_Command) AddValArgument(valarg *SDTNode_Argument) *SDTNode_Command {
	if n.ValArguments == nil {
		n.ValArguments = make([]*SDTNode_Argument, 1)
		n.ValArguments[0] = valarg
	} else {
		n.ValArguments = append(n.ValArguments, valarg)
	}
	valarg.Parent = n
	return n
}

func (n *SDTNode_Command) AddEnd(end *SDTNode_End) *SDTNode_Command {
	n.End = end
	end.Parent = n
	return n
}