package node

import (
	"github.com/z7zmey/php-parser/meta"
	"github.com/z7zmey/php-parser/position"
	"github.com/z7zmey/php-parser/walker"
)

// Parameter node
type Parameter struct {
	Meta         []meta.Meta
	Position     *position.Position
	ByRef        bool
	Variadic     bool
	VariableType Node
	Variable     Node
	DefaultValue Node
}

// NewParameter node constructor
func NewParameter(VariableType Node, Variable Node, DefaultValue Node, ByRef bool, Variadic bool) *Parameter {
	return &Parameter{
		ByRef:        ByRef,
		Variadic:     Variadic,
		VariableType: VariableType,
		Variable:     Variable,
		DefaultValue: DefaultValue,
	}
}

// SetPosition sets node position
func (n *Parameter) SetPosition(p *position.Position) {
	n.Position = p
}

// GetPosition returns node positions
func (n *Parameter) GetPosition() *position.Position {
	return n.Position
}

func (n *Parameter) AddMeta(m []meta.Meta) {
	n.Meta = append(n.Meta, m...)
}

func (n *Parameter) GetMeta() []meta.Meta {
	return n.Meta
}

// Attributes returns node attributes as map
func (n *Parameter) Attributes() map[string]interface{} {
	return map[string]interface{}{
		"ByRef":    n.ByRef,
		"Variadic": n.Variadic,
	}
}

// Walk traverses nodes
// Walk is invoked recursively until v.EnterNode returns true
func (n *Parameter) Walk(v walker.Visitor) {
	if v.EnterNode(n) == false {
		return
	}

	if n.VariableType != nil {
		v.EnterChildNode("VariableType", n)
		n.VariableType.Walk(v)
		v.LeaveChildNode("VariableType", n)
	}

	if n.Variable != nil {
		v.EnterChildNode("Variable", n)
		n.Variable.Walk(v)
		v.LeaveChildNode("Variable", n)
	}

	if n.DefaultValue != nil {
		v.EnterChildNode("DefaultValue", n)
		n.DefaultValue.Walk(v)
		v.LeaveChildNode("DefaultValue", n)
	}

	v.LeaveNode(n)
}