package ast

import "github.com/sqlc-dev/sqlc/internal/sql/format"

type DefElem struct {
	Tag NodeTag[DefElem] `json:"tag"`

	Defnamespace *string       `json:"defnamespace,omitempty"`
	Defname      *string       `json:"defname,omitempty"`
	Arg          Node          `json:"arg,omitempty"`
	Defaction    DefElemAction `json:"defaction"`
	Location     int           `json:"location"`
}

func (n *DefElem) Pos() int {
	return n.Location
}

func (n *DefElem) Format(buf *TrackedBuffer, d format.Dialect) {
	if n == nil {
		return
	}
	if n.Defname != nil {
		switch *n.Defname {
		case "as":
			buf.WriteString("AS ")
			// AS clause contains function body which needs quoting
			if l, ok := n.Arg.(*List); ok {
				for i, item := range l.Items {
					if i > 0 {
						buf.WriteString(", ")
					}
					if s, ok := item.(*String); ok {
						buf.WriteString("'")
						buf.WriteString(s.Str)
						buf.WriteString("'")
					} else {
						buf.astFormat(item, d)
					}
				}
			} else {
				buf.astFormat(n.Arg, d)
			}
		case "language":
			buf.WriteString("LANGUAGE ")
			buf.astFormat(n.Arg, d)
		case "volatility":
			// VOLATILE, STABLE, IMMUTABLE
			buf.astFormat(n.Arg, d)
		case "strict":
			if s, ok := n.Arg.(*Boolean); ok && s.Boolval {
				buf.WriteString("STRICT")
			} else {
				buf.WriteString("CALLED ON NULL INPUT")
			}
		case "security":
			if s, ok := n.Arg.(*Boolean); ok && s.Boolval {
				buf.WriteString("SECURITY DEFINER")
			} else {
				buf.WriteString("SECURITY INVOKER")
			}
		default:
			buf.WriteString(*n.Defname)
			if n.Arg != nil {
				buf.WriteString(" ")
				buf.astFormat(n.Arg, d)
			}
		}
	}
}