package ru.nevetime.clientirc.mixin;

import net.minecraft.client.gui.components.EditBox;
import net.minecraft.client.gui.screens.ChatScreen;
import org.lwjgl.glfw.GLFW;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Shadow;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;

@Mixin(ChatScreen.class)
public abstract class ChatScreenMixin {
    @Shadow protected EditBox input;

    private static final String[] CLIENTIRC_COMMANDS = new String[] {
        ".irc",
        ".irc status",
        ".irc reconnect",
        ".irc reload",
        ".friends add ",
        ".friends remove ",
        ".friends list",
        ".marker remove",
        ".help"
    };

    @Inject(method = "keyPressed", at = @At("HEAD"), cancellable = true)
    private void clientirc$tabComplete(int keyCode, int scanCode, int modifiers, CallbackInfoReturnable<Boolean> cir) {
        if (keyCode != GLFW.GLFW_KEY_TAB) return;
        if (input == null) return;
        String value = input.getValue();
        if (value == null || !value.startsWith(".")) return;

        String best = null;
        for (String candidate : CLIENTIRC_COMMANDS) {
            if (candidate.startsWith(value) && !candidate.equals(value)) {
                if (best == null || candidate.length() < best.length()) {
                    best = candidate;
                }
            }
        }
        if (best != null) {
            input.setValue(best);
            input.setCursorPosition(best.length());
            cir.setReturnValue(true);
        }
    }
}