package de.hftstuttgart.dtabackend.rest.v1.unittest;

import de.hftstuttgart.dtabackend.utils.JGitUtil;
import de.hftstuttgart.dtabackend.utils.RegexUtil;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.core.env.Environment;
import org.springframework.util.FileSystemUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import jakarta.servlet.annotation.MultipartConfig;

import java.io.*;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Rest controller for anything related to the TEST files.
 */
@RestController
@RequestMapping("/v1/unittest")
@MultipartConfig
public class UnitTestUpload {

    private static final Logger LOG = LogManager.getLogger(UnitTestUpload.class);
    private final JGitUtil jGitUtil;
    private final String assignmentBasePath;

    public UnitTestUpload(Environment env, JGitUtil jGitUtil) {
        this.jGitUtil = jGitUtil;

        Path p = Paths.get(env.getProperty("data.dir"), env.getProperty("data.dir.test.folder.name"));
        this.assignmentBasePath = p.toAbsolutePath().toString();
    }

    /**
     * Create a subfolder for the specific assignment.
     * This is called when the teacher creates an assignment and uploads the JUnit test files
     *
     * @param unitTestFileRef The text file which contains the JUnit tests meta data
     * @param assignmentId    ID of the created assignment. Generated by Moodle
     */
    @RequestMapping(method = RequestMethod.POST)
    public void uploadUnitTestFile(
        @RequestParam("unitTestFile") MultipartFile unitTestFileRef,
        @RequestParam("assignmentId") String assignmentId
    ) throws IOException {
        LOG.info("received new assignment");

        File file = Paths.get(this.assignmentBasePath, assignmentId + ".txt").toFile();
        file.mkdirs();

        // save assignment config
        unitTestFileRef.transferTo(file);
        LOG.debug(String.format("saved config file to: %s", file.getAbsolutePath()));

        String subDir="";
        Pattern pattern = Pattern.compile(RegexUtil.DTA_TESTCONFIGREGEX);

        Matcher config = RegexUtil.extractConfig(new FileInputStream(file), pattern);
        if (config == null) {
        	pattern=Pattern.compile(RegexUtil.TESTCONFIGREGEX);
        	config = RegexUtil.extractConfig(new FileInputStream(file), pattern);
        	if(config==null)
        	{
        		throw new RuntimeException("couldn't find repo config for unittest clone");
        	}
        }
        else {
        	subDir=config.group(4);
        }
        LOG.debug("calling test repo clone");
        // cloning assignment repo to persistent space
        jGitUtil.cloneRepository(config, Paths.get(this.assignmentBasePath, assignmentId).toAbsolutePath().toString(), subDir);

        LOG.info(String.format("stored new assignment: %s", file.getAbsolutePath()));
    }

    /**
     * Delete the folder for the assignment.
     * Called when the teacher deletes the JUnitTest assignment
     * <p>
     * {{url}}:8080/v1/unittest?assignmentId=111
     *
     * @param assignmentId ID of the assignment to delete. Generated by Moodle
     */
    @RequestMapping(method = RequestMethod.DELETE)
    public void deleteUnitTestFiles(@RequestParam("assignmentId") String assignmentId) {
        LOG.info(String.format("received deletion order for assignment %s", assignmentId));

        // deleting config file
        File file = Paths.get(
            this.assignmentBasePath,
            assignmentId + ".txt")
            .toFile();
        file.delete();

        // deleting local copy of repository
        file = Paths.get(
            this.assignmentBasePath,
            assignmentId).toFile();
        FileSystemUtils.deleteRecursively(file);

        LOG.info(String.format("assignment %s deletion complete", assignmentId));
    }
}