package de.fullrisk.citrusDev.UIHelper;

import de.fullrisk.citrusDev.Config;
import de.fullrisk.citrusDev.UI.Module_Coords;
import de.fullrisk.citrusDev.UI.Module_FPS;
import de.fullrisk.citrusDev.UI.Module_KeyStrokes;
import io.wispforest.owo.ui.container.FlowLayout;
import io.wispforest.owo.ui.core.Positioning;
import net.minecraft.client.Minecraft;
import org.lwjgl.BufferUtils;
import org.lwjgl.glfw.GLFW;

import java.nio.DoubleBuffer;
import java.util.function.BooleanSupplier;
import java.util.function.IntConsumer;
import java.util.function.IntSupplier;
import java.util.function.Supplier;

public class DraggableHud {

    private static boolean editMode = false;
    private static boolean dragging = false;
    private static FlowLayout dragTarget = null;
    private static double dragStartMouseX, dragStartMouseY;
    private static int dragModuleStartX, dragModuleStartY;
    private static ModuleDragConfig currentConfig;
    private static boolean wasLeftDown = false;
    private static boolean cursorEnabled = false;

    private static final DoubleBuffer cursorXBuf = BufferUtils.createDoubleBuffer(1);
    private static final DoubleBuffer cursorYBuf = BufferUtils.createDoubleBuffer(1);

    public static boolean isEditMode() {
        return editMode;
    }

    public static void setEditMode(boolean enabled) {
        editMode = enabled;
        if (!enabled) {
            wasLeftDown = false;
        }
    }

    public static void tick() {
        Minecraft mc = Minecraft.getInstance();
        if (mc.getWindow() == null) return;
        long window = mc.getWindow().handle();

        if (mc.screen != null) {
            if (dragging) endDrag();
            if (editMode) {
                editMode = false;
                disableCursor(window);
            }
            wasLeftDown = false;
            return;
        }

        if (editMode && GLFW.glfwGetKey(window, GLFW.GLFW_KEY_ESCAPE) == GLFW.GLFW_PRESS) {
            editMode = false;
            disableCursor(window);
            wasLeftDown = false;
            return;
        }

        boolean leftDown = GLFW.glfwGetMouseButton(window, GLFW.GLFW_MOUSE_BUTTON_LEFT) == GLFW.GLFW_PRESS;

        if (editMode && !cursorEnabled) {
            int ww = mc.getWindow().getWidth();
            int wh = mc.getWindow().getHeight();
            GLFW.glfwSetCursorPos(window, ww / 2.0, wh / 2.0);
            GLFW.glfwSetInputMode(window, GLFW.GLFW_CURSOR, GLFW.GLFW_CURSOR_NORMAL);
            cursorEnabled = true;
        } else if (!editMode && cursorEnabled) {
            disableCursor(window);
            wasLeftDown = leftDown;
            return;
        }

        if (cursorEnabled) {
            cursorXBuf.clear();
            cursorYBuf.clear();
            GLFW.glfwGetCursorPos(window, cursorXBuf, cursorYBuf);
            double mouseX = cursorXBuf.get(0);
            double mouseY = cursorYBuf.get(0);

            if (leftDown && !wasLeftDown) {
                tryStartDrag(mouseX, mouseY);
            } else if (dragging && leftDown) {
                updateDrag(mouseX, mouseY);
            } else if (dragging && !leftDown) {
                endDrag();
            }
        }

        wasLeftDown = leftDown;
    }

    private static void disableCursor(long window) {
        if (cursorEnabled) {
            GLFW.glfwSetInputMode(window, GLFW.GLFW_CURSOR, GLFW.GLFW_CURSOR_DISABLED);
            cursorEnabled = false;
        }
    }

    private static void tryStartDrag(double mouseX, double mouseY) {
        Minecraft mc = Minecraft.getInstance();
        var win = mc.getWindow();
        int sw = win.getWidth();
        int sh = win.getHeight();
        int gw = win.getGuiScaledWidth();
        int gh = win.getGuiScaledHeight();

        double guiMouseX = mouseX * gw / sw;
        double guiMouseY = mouseY * gh / sh;

        for (ModuleDragConfig mod : getModules()) {
            FlowLayout container = mod.containerGetter.get();
            if (container == null || !mod.isVisible.getAsBoolean()) continue;

            int modX = mod.getX.getAsInt();
            int modY = mod.getY.getAsInt();
            int left = (int) ((gw - mod.hitW) * modX / 100.0);
            int top = (int) ((gh - mod.hitH) * modY / 100.0);

            if (guiMouseX >= left && guiMouseX <= left + mod.hitW
                    && guiMouseY >= top && guiMouseY <= top + mod.hitH) {
                dragging = true;
                dragTarget = container;
                dragStartMouseX = mouseX;
                dragStartMouseY = mouseY;
                dragModuleStartX = modX;
                dragModuleStartY = modY;
                currentConfig = mod;
                return;
            }
        }
    }

    private static void updateDrag(double mouseX, double mouseY) {
        if (!dragging || dragTarget == null || currentConfig == null) return;

        Minecraft mc = Minecraft.getInstance();
        var win = mc.getWindow();
        int sw = win.getWidth();
        int sh = win.getHeight();
        int gw = win.getGuiScaledWidth();
        int gh = win.getGuiScaledHeight();

        double deltaX = mouseX - dragStartMouseX;
        double deltaY = mouseY - dragStartMouseY;
        double guiDeltaX = deltaX * gw / sw;
        double guiDeltaY = deltaY * gh / sh;
        int newX = dragModuleStartX + (int) (guiDeltaX / (gw - currentConfig.hitW) * 100);
        int newY = dragModuleStartY + (int) (guiDeltaY / (gh - currentConfig.hitH) * 100);
        newX = Math.max(0, Math.min(100, newX));
        newY = Math.max(0, Math.min(100, newY));

        dragTarget.positioning(Positioning.relative(newX, newY));
        currentConfig.setX.accept(newX);
        currentConfig.setY.accept(newY);
    }

    private static void endDrag() {
        if (currentConfig != null) {
            Config.get().save();
        }
        dragging = false;
        dragTarget = null;
        currentConfig = null;
    }

    private static ModuleDragConfig[] getModules() {
        Config c = Config.get();
        return new ModuleDragConfig[]{
                new ModuleDragConfig(
                        Module_Coords::getCoordinates, 120, 50,
                        () -> c.coordsX, v -> c.coordsX = v,
                        () -> c.coordsY, v -> c.coordsY = v,
                        Module_Coords::isEnabled
                ),
                new ModuleDragConfig(
                        Module_KeyStrokes::getKeyContainer,
                        c.keySize * 3 + 20, c.keySize * 2 + 20,
                        () -> c.keyX, v -> c.keyX = v,
                        () -> c.keyY, v -> c.keyY = v,
                        Module_KeyStrokes::isEnabled
                ),
                new ModuleDragConfig(
                        Module_FPS::getFpsContainer, 100, 30,
                        () -> c.fpsX, v -> c.fpsX = v,
                        () -> c.fpsY, v -> c.fpsY = v,
                        Module_FPS::isEnabled
                )
        };
    }

    private static class ModuleDragConfig {
        Supplier<FlowLayout> containerGetter;
        int hitW, hitH;
        IntSupplier getX;
        IntConsumer setX;
        IntSupplier getY;
        IntConsumer setY;
        BooleanSupplier isVisible;

        ModuleDragConfig(Supplier<FlowLayout> containerGetter, int hitW, int hitH,
                         IntSupplier getX, IntConsumer setX,
                         IntSupplier getY, IntConsumer setY,
                         BooleanSupplier isVisible) {
            this.containerGetter = containerGetter;
            this.hitW = hitW;
            this.hitH = hitH;
            this.getX = getX;
            this.setX = setX;
            this.getY = getY;
            this.setY = setY;
            this.isVisible = isVisible;
        }
    }
}