package main

import (
	"fmt"
	"log"
	"os"
)

func index() *os.File {
	tmp0, err := os.CreateTemp(TmpDir, "glocate-idx")
	if err != nil {
		log.Fatalln(err)
	}
	defer os.Remove(tmp0.Name())

	entsWalker := make(chan Ent, 1<<10)
	entsWriter := make(chan Ent, 1<<10)
	dirSizerJob := make(chan struct{})
	var dirSizes []int64
	entsWalker <- Ent{name: []string{"./"}}
	sinkBack := make(chan Ent, 1)
	go func() {
		dirSizer(&dirSizes, 1, sinkBack, entsWalker, entsWriter)
		close(dirSizerJob)
	}()

	writerJob := make(chan struct{})
	go func() {
		writer(tmp0, entsWriter)
		close(writerJob)
	}()

	walkerStatusStop := make(chan struct{})
	go walkerStatus(walkerStatusStop)
	err = walker(entsWalker, []string{"./"})
	walkerStatusStop <- struct{}{}
	<-walkerStatusStop
	fmt.Print("\r")
	if err != nil {
		log.Fatalln(err)
	}
	close(entsWalker)
	<-dirSizerJob
	close(entsWriter)
	<-writerJob

	tmp1 := applyDirSizes(tmp0, dirSizes)
	tmp0.Close()
	return tmp1
}