package main

// will this help things?
// this is a hack for testing for now
// cram a mutex in the pb.go file

import (
	"errors"
	"fmt"
	"os"
	"strings"

	"go.wit.com/log"
)

func addMutex(names map[string]string) error {
	fullname := names["protobase"] + ".pb.go"
	log.Info("fullname:", fullname)
	data, err := os.ReadFile(fullname)
	if err != nil {
		// log.Info("open config file :", err)
		return err
	}

	w, _ := os.OpenFile(names["protobase"]+".pb.go", os.O_WRONLY|os.O_CREATE, 0600)

	var found bool

	lines := strings.Split(string(data), "\n")
	for _, line := range lines {
		// log.Info("line:", line)
		start := "type " + names["Bases"] + " struct {"
		if strings.HasSuffix(line, start) {
			found = true
			log.Info("FOUND line:", line)
			fmt.Fprintln(w, line)
			fmt.Fprintln(w, "\tsync.RWMutex // auto-added by go.wit.com/apps/autogenpb")
			fmt.Fprintln(w, "")
		} else {
			fmt.Fprintln(w, line)
		}
	}
	// os.Exit(-1)
	if found {
		return nil
	}
	return errors.New("addMutex() parse didn't work")
}