package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"time"
)

var (
	registeredFuzzers []Fuzzer
	sleepSecs *int
)

func registerWatcherFlags() {
	sleepSecs = flag.Int("scan-delay", 30, "Seconds to sleep between scans of the fuzzer directories")
}

// Returns the path to every fuzzer to watch
func getFuzzersToWatch() ([]string, error) {
	// flag.Args() returns all arguments after --
	fuzzers := flag.Args()
	if len(fuzzers) > 0 {
		return fuzzers, nil
	}

	// Wrong usage - construct a helpful error message
	return []string{}, fmt.Errorf("Please give at least one fuzzer directory to watch.\n%s [options...] -- /path/to/fuzzer1 /path/to/fuzzer2", os.Args[0])
}

// Registers the given paths as fuzzer directories which should be monitored
func registerFuzzers(targets []string) {
	// First, create fuzzer instances based on the directory
	for _, f := range targets {
		tmpFuzzer := CreateFuzzer(f)
		registeredFuzzers = append(registeredFuzzers, tmpFuzzer)
	}

	// Create gauges
	InitializeGauges()
}

// Watch over the fuzzer(s)
func watchFuzzers() {
	// Loop forever
	for {
		// Loop over every registered fuzzer
		for _, f := range registeredFuzzers {
			parseErr := f.ParseStatsFile()

			if parseErr != nil {
				log.Printf("Encountered error while parsing %s: %s", f, parseErr.Error())
			}
		}

		// and sleep
		time.Sleep(time.Duration(*sleepSecs) * time.Second)
	}
}