package io.gitlab.jfronny.googlechat;

import io.gitlab.jfronny.commons.log.*;
import io.gitlab.jfronny.libjf.translate.api.*;
import net.fabricmc.api.*;
import net.fabricmc.fabric.api.message.v1.*;
import net.fabricmc.loader.api.*;
import net.minecraft.text.*;

import java.util.*;
import java.util.concurrent.*;

public class GoogleChat implements ModInitializer {
    public static final String MOD_ID = "google-chat";
    public static final Logger LOGGER = Logger.forName(MOD_ID);
    public static final TranslateService<?> TRANSLATE_SERVICE = TranslateService.getConfigured();

    @Override
    public void onInitialize() {
        ServerMessageDecoratorEvent.EVENT.register(ServerMessageDecoratorEvent.CONTENT_PHASE, (sender, message) -> {
            Text original;
            if (sender != null) {  // Client messages should first be translated to the server language
                if (hasTarget(Direction.C2S) && hasTarget(Direction.S2C)) // Do not translate back and forth
                    return CompletableFuture.completedFuture(message);
                original = message;
                message = translateIfNeeded(message, Direction.C2S, true);
                if (GoogleChatConfig.debugLogs) LOGGER.info("Applied C2S translation from " + original + " to " + message);
            }
            // All messages should be translated to the client language before sending
            original = message;
            message = translateIfNeeded(message, Direction.S2C, true);
            if (GoogleChatConfig.debugLogs) LOGGER.info("Applied S2C translation from " + original + " to " + message);
            return CompletableFuture.completedFuture(message);
        });
    }

    public static Text translateIfNeeded(Text source, Direction direction, boolean respectRegex) {
        if (shouldSkipOutright(direction)) return source;
        String sourceString = toString(source);
        if (respectRegex && failsRegex(sourceString, direction))
            return source;
        if (GoogleChatConfig.desugar) {
            MutableText translatedText = Text.literal(translateIfNeeded(sourceString, direction, true));
            if (GoogleChatConfig.debugLogs) LOGGER.info("Translated " + sourceString + " to " + toString(translatedText));
            if (GoogleChatConfig.translationTooltip)
                return source.copy().setStyle(addHover(Style.EMPTY, Text.literal("Translated: ").append(translatedText)));
            else
                return translatedText.setStyle(addHover(Style.EMPTY, Text.literal("Original: ").append(source)));
        }
        MutableText translated;
        if (source.getContent() instanceof TranslatableTextContent tx) {
            Object[] args = tx.getArgs();
            args = Arrays.copyOf(args, args.length);
            // We're not translating TranslatableText, but are translating arguments
            for (int i = 0; i < args.length; i++) {
                args[i] = args[i] instanceof Text tx1 ? translateIfNeeded(tx1, direction, false)
                        : args[i] instanceof String tx1 ? translateIfNeeded(tx1, direction, false)
                        : args[i];
            }
            translated = Text.translatable(tx.getKey(), args);
        } else if (source.getContent() instanceof LiteralTextContent tx) {
            translated = Text.literal(translateIfNeeded(tx.string(), direction, false)).setStyle(source.getStyle());
        } else {
            //LOGGER.info("Unhandled text type: " + source.getClass() + " (" + source + ")");
            translated = source.copy();
        }
        if (GoogleChatConfig.translationTooltip)
            return source.copy().styled(style -> addHover(style, translated));
        else
            return translated;
    }

    private static String toString(Text text) {
        StringBuilder sb = new StringBuilder();
        text.asOrderedText().accept((index, style, codePoint) -> {
            sb.append((char)codePoint);
            return true;
        });
        return sb.toString();
    }

    private static Style addHover(Style style, Text hoverText) {
        return style.withHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, hoverText));
    }

    public static String translateIfNeeded(String source, Direction direction, boolean respectRegex) {
        if (shouldSkipOutright(direction)) return source;
        if (respectRegex && failsRegex(source, direction))
            return source;
        // Ignore generics since this is apparently not something java supports
        @SuppressWarnings("rawtypes") TranslateService svc = GoogleChat.TRANSLATE_SERVICE;
        Language sourceLang = svc.parseLang(direction == Direction.C2S ? GoogleChatConfig.clientLanguage : GoogleChatConfig.serverLanguage);
        Language targetLang = svc.parseLang(direction == Direction.C2S ? GoogleChatConfig.serverLanguage : GoogleChatConfig.clientLanguage);
        try {
            //noinspection unchecked
            return svc.translate(source, sourceLang, targetLang);
        } catch (TranslateException e) {
            LOGGER.error("Could not translate text: " + source, e);
            return source;
        }
    }

    private static boolean failsRegex(String text, Direction direction) {
        boolean isSender = (FabricLoader.getInstance().getEnvironmentType() == EnvType.CLIENT) == (direction == Direction.C2S);
        if (isSender) return text.matches(GoogleChatConfig.sendingRegex) == GoogleChatConfig.sendingRegexIsBlacklist;
        else return text.matches(GoogleChatConfig.receivingRegex) == GoogleChatConfig.receivingRegexIsBlacklist;
    }

    private static boolean shouldSkipOutright(Direction direction) {
        return !GoogleChatConfig.enabled || !hasTarget(direction);
    }

    private static boolean hasTarget(Direction direction) {
        return !TRANSLATE_SERVICE.parseLang(switch (direction) {
            case C2S -> GoogleChatConfig.serverLanguage;
            case S2C -> GoogleChatConfig.clientLanguage;
        }).getIdentifier().equals("auto");
    }

    public enum Direction {
        C2S,
        S2C
    }
}