package main

import (
	"fmt"
	"io"
)

// generates Find() and some other stuff

func (msg *MsgName) generateFindBy(w io.Writer, FUNCNAME, STRUCT string, sortvals *Sort, childVar *MsgVar) string {
	LOCK := msg.getLockname("x")
	if childVar.VarType != "string" {
		return ""
	}
	VARNAME := sortvals.VarName
	VARTYPE := sortvals.VarType
	COLOR := childVar.VarName
	funcdef := "func (x *" + STRUCT + ") " + FUNCNAME + "(s string) *" + VARTYPE

	fmt.Fprintln(w, "// lookup a", STRUCT, "by the ", COLOR)
	fmt.Fprintln(w, funcdef, "{")
	fmt.Fprintln(w, "	if x == nil {")
	fmt.Fprintln(w, "		return nil")
	fmt.Fprintln(w, "	}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	"+LOCK+".RLock()")
	fmt.Fprintln(w, "	defer "+LOCK+".RUnlock()")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	for i, _ := range x."+VARNAME+" {")
	fmt.Fprintln(w, "		if x."+VARNAME+"[i]."+COLOR+" == s {")
	fmt.Fprintln(w, "			return x."+VARNAME+"[i]")
	fmt.Fprintln(w, "		}")
	fmt.Fprintln(w, "	}")
	fmt.Fprintln(w, "	return nil")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")

	return funcdef
}