package com.thebrokenrail.scriptcraft.quickjs;

import com.thebrokenrail.scriptcraft.ScriptCraft;
import com.thebrokenrail.scriptcraft.util.OSUtil;
import com.thebrokenrail.scriptcraft.util.ScriptCraftEntrypoint;
import net.fabricmc.loader.api.FabricLoader;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.List;

@SuppressWarnings("unused")
public class QuickJS {
    public QuickJS() throws JSException {
        init();
    }

    private long ctx;
    private long rt;

    public native void init() throws JSException;

    public native void free();

    public native Object bridge(String method, Object... args) throws JSException;

    public native void run(String data);

    static {
        try {
            File file = File.createTempFile("lib" + ScriptCraft.NAMESPACE, OSUtil.getLibExtension());
            file.deleteOnExit();
            System.out.println("Extracting ScriptCraft Native To: " + file.getAbsoluteFile().toPath());
            InputStream so = (QuickJS.class.getResourceAsStream(File.separator + "natives" + File.separator + OSUtil.getOS() + File.separator + "lib" + ScriptCraft.NAMESPACE + OSUtil.getLibExtension()));
            if (so == null) {
                throw new RuntimeException("ScriptCraft does not support your OS: " + OSUtil.getOS());
            } else {
                Files.copy(so, file.getAbsoluteFile().toPath(), StandardCopyOption.REPLACE_EXISTING);
                System.load(file.getAbsolutePath());
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static String loadModule(String name) {
        String[] arr = name.split(File.separator, 2);
        if (ScriptCraft.MOD_ID_PATTERN.matcher(arr[0]).matches()) {
            List<ScriptCraftEntrypoint> mods = FabricLoader.getInstance().getEntrypoints(ScriptCraft.NAMESPACE, ScriptCraftEntrypoint.class);
            if (arr.length == 1) {
                return null;
            } else {
                for (ScriptCraftEntrypoint mod : mods) {
                    if (mod.getModID().equals(arr[0])) {
                        //noinspection CatchMayIgnoreException
                        try {
                            InputStream stream = mod.getClass().getResourceAsStream(File.separator + ScriptCraft.NAMESPACE + File.separator + arr[0] + File.separator + arr[1]);

                            if (stream != null) {
                                StringBuilder textBuilder = new StringBuilder();
                                try (Reader reader = new BufferedReader(new InputStreamReader(stream))) {
                                    int c;
                                    while ((c = reader.read()) != -1) {
                                        textBuilder.append((char) c);
                                    }
                                }
                                stream.close();

                                return textBuilder.toString();
                            }
                        } catch (IOException e) {
                        }
                    }
                }
            }
        }
        return null;
    }

    private static final String[] SUPPORTED_EXTENSION = new String[]{"", ".js", ".json", ".mjs"};

    public static String normalizeModule(String baseName, String name) {
        String normalizedPath;

        if (name.startsWith(".")) {
            Path parentPath = Paths.get(baseName.replaceAll("/", File.separator)).getParent();
            if (parentPath == null) {
                parentPath = Paths.get(File.separator);
            }
            normalizedPath = Paths.get(parentPath.toString(), name.replaceAll("/", File.separator)).normalize().toString();
            if (normalizedPath.charAt(0) == File.separatorChar) {
                normalizedPath = normalizedPath.substring(1);
            }
        } else {
            normalizedPath = name;
        }

        String result = null;
        boolean success = false;

        String[] arr = normalizedPath.split(File.separator, 2);
        if (ScriptCraft.MOD_ID_PATTERN.matcher(arr[0]).matches()) {
            List<ScriptCraftEntrypoint> mods = FabricLoader.getInstance().getEntrypoints(ScriptCraft.NAMESPACE, ScriptCraftEntrypoint.class);
            if (arr.length == 1) {
                for (ScriptCraftEntrypoint mod : mods) {
                    if (mod.getModID().equals(arr[0])) {
                        result = arr[0] + File.separator + mod.getModIndex();
                        success = true;
                        break;
                    }
                }
            } else {
                result = arr[0] + File.separator + arr[1];
                success = true;
            }
        }

        if (success) {
            for (String extension : SUPPORTED_EXTENSION) {
                if (loadModule(result + extension) != null) {
                    return result + extension;
                }
            }
        }

        return null;
    }

    public static void print(String data, boolean err) {
        String[] lines = data.split("\n");
        for (String line : lines) {
            if (err) {
                System.err.println(line);
            } else {
                System.out.println(line);
            }
        }
    }
}