package main

// results.go: saves good results to a file or console

import (
	"fmt"
	"os"
)

func init() {
	registerParam("out-file", "good.txt", "results will be saved in this file")
	registerAlias("o", "out-file")
}

var outFile *os.File
var resultChannel chan *Task

func ResultService() {
	openResultFile()
	defer closeResultFile()

	resultChannel = make(chan *Task, 128)

	for task := range resultChannel {
		if outFile != nil {
			fmt.Fprintf(outFile, "%v\n", task.String())
		}
	}
}

func RegisterResult(task *Task, good bool) {
	if !good {
		log("res", 1, "bad: %v", task.String())
	} else {
		log("res", 0, "good: %v", task.String())
		if outFile != nil {
			resultChannel <- task
		}
	}
}

func EndResults() {
	close(resultChannel)
}

func openResultFile() {
	fileName := getParamString("out-file")
	if fileName == "" {
		log("out", 0, "WARNING: out-file is not specified, results will only be logged in console")
		outFile = nil
	} else {
		var err error
		outFile, err = os.OpenFile(fileName, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)

		if err != nil {
			fail("error opening result file \"%v\": %v", fileName, err.Error())
		}

		log("out", 2, "opened result file \"%v\"", fileName)
	}
}

func closeResultFile() {
	if outFile != nil {
		outFile.Close()
		outFile = nil
		log("out", 2, "closed result file")
	}
}