import { subprocess } from 'astal';
import { App } from 'astal/gtk3';
import GObject, { register, signal } from 'astal/gobject';

import AstalIO from 'gi://AstalIO?version=0.1';

import { hyprMessage } from '../lib';

const ON_RELEASE_TRIGGERS = [
    'released',
    'TOUCH_UP',
    'HOLD_END',
];
const ON_CLICK_TRIGGERS = [
    'pressed',
    'TOUCH_DOWN',
];

/* Types */
import { PopupWindow } from '../widgets/misc/popup-window';
import { CursorPos, Layer, LayerResult } from '../lib';


@register()
export default class MonitorClicks extends GObject.Object {
    @signal(Boolean)
    declare procStarted: (state: boolean) => void;

    @signal(Boolean)
    declare procDestroyed: (state: boolean) => void;

    @signal(String)
    declare released: (procLine: string) => void;

    @signal(String)
    declare clicked: (procLine: string) => void;

    private process = null as AstalIO.Process | null;

    constructor() {
        super();
        this.#initAppConnection();
    }

    startProc() {
        if (this.process) {
            return;
        }

        this.process = subprocess(
            ['libinput', 'debug-events'],
            (output) => {
                if (output.includes('cancelled')) {
                    return;
                }

                if (ON_RELEASE_TRIGGERS.some((p) => output.includes(p))) {
                    MonitorClicks.detectClickedOutside('released');
                    this.emit('released', output);
                }

                if (ON_CLICK_TRIGGERS.some((p) => output.includes(p))) {
                    MonitorClicks.detectClickedOutside('clicked');
                    this.emit('clicked', output);
                }
            },
        );
        this.emit('proc-started', true);
    }

    killProc() {
        if (this.process) {
            this.process.kill();
            this.process = null;
            this.emit('proc-destroyed', true);
        }
    }

    #initAppConnection() {
        App.connect('window-toggled', () => {
            const anyVisibleAndClosable =
                (App.get_windows() as PopupWindow[]).some((w) => {
                    const closable = w.close_on_unfocus &&
                        !(
                            w.close_on_unfocus === 'none' ||
                            w.close_on_unfocus === 'stay'
                        );

                    return w.visible && closable;
                });

            if (anyVisibleAndClosable) {
                this.startProc();
            }

            else {
                this.killProc();
            }
        });
    }

    static async detectClickedOutside(clickStage: string) {
        const toClose = ((App.get_windows() as PopupWindow[])).some((w) => {
            const closable = (
                w.close_on_unfocus &&
                w.close_on_unfocus === clickStage
            );

            return w.visible && closable;
        });

        if (!toClose) {
            return;
        }

        try {
            const layers = JSON.parse(await hyprMessage('j/layers')) as LayerResult;
            const pos = JSON.parse(await hyprMessage('j/cursorpos')) as CursorPos;

            Object.values(layers).forEach((key) => {
                const overlayLayer = key.levels['3'];

                if (overlayLayer) {
                    const noCloseWidgetsNames = [
                        'bar-',
                        'osk',
                    ];

                    const getNoCloseWidgets = (names: string[]) => {
                        const arr = [] as Layer[];

                        names.forEach((name) => {
                            arr.push(
                                overlayLayer.find(
                                    (n) => n.namespace.startsWith(name),
                                ) ||
                            // Return an empty Layer if widget doesn't exist
                            {
                                address: '',
                                x: 0,
                                y: 0,
                                w: 0,
                                h: 0,
                                namespace: '',
                            },
                            );
                        });

                        return arr;
                    };
                    const clickIsOnWidget = (w: Layer) => {
                        return pos.x > w.x && pos.x < w.x + w.w &&
                        pos.y > w.y && pos.y < w.y + w.h;
                    };

                    const noCloseWidgets = getNoCloseWidgets(noCloseWidgetsNames);

                    const widgets = overlayLayer.filter((n) => {
                        let window = null as null | PopupWindow;

                        if (App.get_windows().some((win) =>
                            win.name === n.namespace)) {
                            window = (App.get_window(n.namespace) as PopupWindow);
                        }

                        return window &&
                        window.close_on_unfocus &&
                        window.close_on_unfocus ===
                        clickStage;
                    });

                    if (noCloseWidgets.some(clickIsOnWidget)) {
                    // Don't handle clicks when on certain widgets
                    }
                    else {
                        widgets.forEach((w) => {
                            if (!(pos.x > w.x && pos.x < w.x + w.w &&
                            pos.y > w.y && pos.y < w.y + w.h)) {
                                App.get_window(w.namespace)?.set_visible(false);
                            }
                        });
                    }
                }
            });
        }
        catch (e) {
            console.log(e);
        }
    }
}