package ru.oa2.lti.infrastructure.runner;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.UUID;

@Slf4j
@Component
public class RunnerImpl implements Runner {

    private final String TEMP_DIR = "./temp/";

    @Override
    public boolean run(UUID userId, String script) {
        try {
            return runScript(userId, script);
        } catch (Exception ex) {
            log.error(ex.getMessage());
            return false;
        }
    }

    //TODO добавить вывод результата/интерпретации
    @Override
    public boolean check(UUID userId, String script) {
        try {
            return runScript(userId, script);
        } catch (Exception ex) {
            log.error(ex.getMessage());
            return false;
        }
    }

    private boolean runScript(UUID userId, String script) throws Exception {

        var processBuilder = new ProcessBuilder();
        processBuilder.command("bash", saveFile(userId, script));

        var process = processBuilder.start();

        BufferedReader reader = new BufferedReader(
                new InputStreamReader(process.getInputStream())
        );

        StringBuilder output = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            output.append(line).append("\n");
        }
        log.info(output.toString());

        int exitCode = process.waitFor();
        return exitCode == 0;
    }

    private String saveFile(UUID userId, String script) throws IOException {
        Path path = Paths.get(TEMP_DIR + userId.toString());

        if (!Files.exists(path)) {
            Files.createDirectories(path);
        }
        var tm = System.currentTimeMillis();
        var scriptPath = Files.write(
                Paths.get(TEMP_DIR + userId + "/" + tm),
                script.getBytes(StandardCharsets.UTF_8));

        return scriptPath.toString();
    }
}