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
}

func (msg *MsgName) deleteBy(w io.Writer, FRUIT, APPLES, APPLE, COLOR, FUNCNAME, VARNAME string) string {
	LOCK := msg.getLockname("x")
	funcdef := "func (x *" + FRUIT + ") " + FUNCNAME + "(s string) bool"

	fmt.Fprintln(w, funcdef, "{")
	fmt.Fprintln(w, "	"+LOCK+".Lock()")
	fmt.Fprintln(w, "	defer "+LOCK+".Unlock()")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	for i, _ := range x."+APPLES+" {")
	fmt.Fprintln(w, "		if x."+APPLES+"[i]."+VARNAME+" == s {")
	fmt.Fprintln(w, "			x."+APPLES+"[i] = x."+APPLES+"[len(x."+APPLES+")-1]")
	fmt.Fprintln(w, "			x."+APPLES+" = x."+APPLES+"[:len(x."+APPLES+")-1]")
	fmt.Fprintln(w, "			return true")
	fmt.Fprintln(w, "		}")
	fmt.Fprintln(w, "	}")
	fmt.Fprintln(w, "	return false")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")

	return funcdef
}

// this tries to return the deleted one but is wrong/gives warning if mutex lock is in struct
func (msg *MsgName) deleteByWithCopy(w io.Writer, FRUIT, APPLES, APPLE, COLOR, FUNCNAME, VARNAME string) string {
	LOCK := msg.getLockname("x")

	funcdef := "func (x *" + FRUIT + ") " + FUNCNAME + "(s string) *" + APPLE

	fmt.Fprintln(w, "// TESTING fails with 'go vet' warning")
	fmt.Fprintln(w, funcdef, "{")
	fmt.Fprintln(w, "	"+LOCK+".Lock()")
	fmt.Fprintln(w, "	defer "+LOCK+".Unlock()")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	var newr "+APPLE)
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	for i, _ := range x."+APPLES+" {")
	fmt.Fprintln(w, "		if x."+APPLES+"[i]."+VARNAME+" == s {")
	fmt.Fprintln(w, "			newr = *x."+APPLES+"[i]")
	fmt.Fprintln(w, "			x."+APPLES+"[i] = x."+APPLES+"[len(x."+APPLES+")-1]")
	fmt.Fprintln(w, "			x."+APPLES+" = x."+APPLES+"[:len(x."+APPLES+")-1]")
	fmt.Fprintln(w, "			return &newr")
	fmt.Fprintln(w, "		}")
	fmt.Fprintln(w, "	}")
	fmt.Fprintln(w, "	return nil")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")

	return funcdef
}

// new 2025 idea. useful? TODO: look at this again in 1y
func (msg *MsgName) insertBy(w io.Writer, FRUIT, APPLES, APPLE string, COLOR string) {
	LOCK := msg.getLockname("x")

	fmt.Fprintln(w, "// returns an "+APPLE+" if "+COLOR+" matches, otherwise create")
	fmt.Fprintln(w, "func (x *"+FRUIT+") InsertBy"+COLOR+" (y string) *"+APPLE+" {")
	fmt.Fprintln(w, "	"+LOCK+".Lock()")
	fmt.Fprintln(w, "	defer "+LOCK+".Unlock()")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	for _, p := range x."+APPLES+" {")
	fmt.Fprintln(w, "		if p."+COLOR+" == y {")
	fmt.Fprintln(w, "			return p")
	fmt.Fprintln(w, "		}")
	fmt.Fprintln(w, "	}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "	z := new("+APPLE+")")
	fmt.Fprintln(w, "	z."+COLOR+" = y")
	fmt.Fprintln(w, "	x."+APPLES+" = append(x."+APPLES+", z)")
	fmt.Fprintln(w, "	return z")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
}