package name.nathanmcrae.numbersstation;

import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.SftpException;
import com.leakyabstractions.result.api.Result;
import com.leakyabstractions.result.core.Results;
import com.tearsofaunicorn.wordpress.api.model.Post;
import com.tearsofaunicorn.wordpress.api.WordpressClient;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.FileHandler;
import java.util.logging.Logger;
import java.util.logging.Level;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import org.apache.commons.cli.*;

public class Main extends Application {
    private static final Logger logger = Logger.getLogger(Main.class.getName());
    // TODO: get git info
    private static final String VERSION = "0.0.1";
    private static Path statePath = null;

    public static Path getStatePath() {
        if (statePath == null) {
            String stateHome = System.getenv("XDG_STATE_HOME");
            if (stateHome == null || stateHome.isEmpty() || !Paths.get(stateHome).isAbsolute()) {
                String userHome = System.getProperty("user.home");
                statePath = Paths.get(userHome, ".local", "state", "numbers-station");
            } else {
                statePath = Paths.get(stateHome, "numbers-station");
            }
        }

        return statePath;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("MainView.fxml"));
            primaryStage.setTitle("Numbers Station");
            primaryStage.setScene(new Scene(root));
            primaryStage.show();
            logger.info("Application started");
        } catch (IOException e) {
            logger.log(Level.SEVERE, "Failed to load main view", e);
        }
    }

    private static void setupLogger() {
        try {
            Path logFile = getStatePath().resolve("main.log");

            if (!Files.exists(logFile.getParent())) {
                Files.createDirectories(logFile.getParent());
            }

            FileHandler fileHandler = new FileHandler(logFile.toString(), true);
            fileHandler.setFormatter(new CustomFormatter());
            logger.addHandler(fileHandler);
        } catch (IOException e) {
            System.out.println("Failed to set up logger: " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        MainParsedArguments parsedArgs = new MainParsedArguments(args);

        if (parsedArgs.getHelpFlag()) {
            parsedArgs.printHelp();
            System.exit(0);
        }

        if (parsedArgs.getVersionFlag()) {
            System.out.println("Numbers Station version " + VERSION);
            System.exit(0);
        }

        Thread.setDefaultUncaughtExceptionHandler((thread, throwable) -> {
            logger.log(Level.SEVERE, "Unhandled exception caught", throwable);
        });

        Platform.setImplicitExit(false);
        Thread.currentThread().setUncaughtExceptionHandler((thread, throwable) -> {
            logger.log(Level.SEVERE, "Unhandled exception in JavaFX application thread", throwable);
        });

        setupLogger();

        if (parsedArgs.getStationName() != null) {
            // TODO: errors in runStation should trigger a notification
            runStation(parsedArgs);
        } else {
            launch(args);
        }
    }

    public static void runStation(MainParsedArguments parsedArgs) {
        if (parsedArgs.getStationName() == null || parsedArgs.getStationName() == "") {
            logger.log(Level.SEVERE, "Station name must be provided and not empty");
            // TODO: Notification
            System.exit(1);
        }

        Result<MainSettings, Exception> result = MainSettings.load();
        if (!result.hasSuccess()) {
            logger.log(Level.SEVERE, "Unable to load settings");
            // TODO: Notification
            System.exit(1);
        }
        MainSettings settings = result.getSuccess().get();

        StationSettings loadedStation = settings.getStations().stream()
            .filter(station -> station.getName().equals(parsedArgs.getStationName()))
            .findFirst()
            .orElse(null);

        if (loadedStation == null) {
            logger.log(Level.SEVERE, "Unable to find station " + parsedArgs.getStationName());
            // TODO: Notification
            System.exit(1);
        }

        logger.info("Loaded station " + parsedArgs.getStationName());

        Path stationDirPath = loadedStation.stationPath();

        try {
            boolean generateMessage = false;
            if (!Files.exists(stationDirPath)) {
                Files.createDirectories(stationDirPath);
            }

            Path nextMessagePath = stationDirPath.resolve("next-message.txt");
            String messageText;
            if (!Files.exists(nextMessagePath)) {
                messageText = loadedStation.generateMessage(settings.getMessageGenerationAttempts());
            } else {
                messageText = new String(Files.readAllBytes(nextMessagePath));
            }

            // Send message using appropriate method
            switch (loadedStation.getMessageMethod()) {
                case StationSettings.MessageMethod.SFTP:
                    //loadedStation.uploadNextMessageToSFTP();
                    break;
                case StationSettings.MessageMethod.WORDPRESS:
                    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
                    String dateStr = dateFormat.format(new Date());
                    System.setProperty("wordpress.username", loadedStation.getUsername());
                    System.setProperty("wordpress.password", loadedStation.getPassword());
                    System.setProperty("wordpress.url", loadedStation.getAddress());
                    Post post = new Post(dateStr, messageText);
                    WordpressClient client = new WordpressClient();
                    String newPostId = client.newPost(post);
                    break;
                default:
                logger.log(Level.SEVERE, "Message method " + loadedStation.getMessageMethod() + " not supported");
                // TODO: Notification
                System.exit(1);
            }

            String newMessageText = loadedStation.generateMessage(settings.getMessageGenerationAttempts());
            Files.write(nextMessagePath, newMessageText.getBytes(StandardCharsets.UTF_8));
        } catch (IOException | StationSettings.MessageGenerationException e) {
            logger.log(Level.SEVERE, "Exception while posting message to station " + parsedArgs.getStationName(), e);
            // TODO: Notification
            System.exit(1);
        }

        System.exit(0);
    }
}