import Notifications from 'resource:///com/github/Aylur/ags/service/notifications.js';

import { Box, EventBox } from 'resource:///com/github/Aylur/ags/widget.js';
import { timeout } from 'resource:///com/github/Aylur/ags/utils.js';

import { HasNotifs } from './base.js';

const { Gtk } = imports.gi;

const MAX_OFFSET = 200;
const OFFSCREEN = 300;
const ANIM_DURATION = 500;
const SLIDE_MIN_THRESHOLD = 10;
const TRANSITION = 'transition: margin 0.5s ease, opacity 0.5s ease;';
const SQUEEZED = 'margin-bottom: -70px; margin-top: -70px;';
const MAX_LEFT = `
    margin-left: -${Number(MAX_OFFSET + OFFSCREEN)}px;
    margin-right: ${Number(MAX_OFFSET + OFFSCREEN)}px;
`;
const MAX_RIGHT = `
    margin-left:   ${Number(MAX_OFFSET + OFFSCREEN)}px;
    margin-right: -${Number(MAX_OFFSET + OFFSCREEN)}px;
`;

const slideLeft = `${TRANSITION} ${MAX_LEFT}
                        margin-top: 0px;
                        margin-bottom: 0px;
                        opacity: 0;`;
const squeezeLeft = `${TRANSITION} ${MAX_LEFT} ${SQUEEZED} opacity: 0;`;

const slideRight = `${TRANSITION} ${MAX_RIGHT}
                        margin-top: 0px;
                        margin-bottom: 0px;
                        opacity: 0;`;
const squeezeRight = `${TRANSITION} ${MAX_RIGHT} ${SQUEEZED} opacity: 0;`;

const defaultStyle = `${TRANSITION} margin: unset; opacity: 1;`;


export default ({
    id,
    slideIn = 'Left',
    command = () => {/**/},
    ...props
}) => {
    const widget = EventBox({
        ...props,
        cursor: 'grab',
        on_hover: (self) => {
            if (!self.attribute.hovered) {
                self.attribute.hovered = true;
            }
        },
        on_hover_lost: (self) => {
            if (self.attribute.hovered) {
                self.attribute.hovered = false;
            }
        },

        attribute: {
            dragging: false,
            hovered: false,
            ready: false,
            id,

            /** @param {'Left'|'Right'} side */
            slideAway: (side) => {
                // Slide away
                // @ts-expect-error
                widget.child.setCss(side === 'Left' ? slideLeft : slideRight);

                // Make it uninteractable
                widget.sensitive = false;

                timeout(ANIM_DURATION - 100, () => {
                    // Reduce height after sliding away
                    // @ts-expect-error
                    widget.child?.setCss(side === 'Left' ?
                        squeezeLeft :
                        squeezeRight);

                    timeout(ANIM_DURATION, () => {
                        // Kill notif and update HasNotifs after anim is done
                        command();

                        HasNotifs.value = Notifications
                            .notifications.length > 0;

                        // @ts-expect-error
                        widget.get_parent()?.remove;
                    });
                });
            },
        },
    });

    const gesture = Gtk.GestureDrag.new(widget);

    widget.add(Box({
        css: squeezeLeft,
        setup: (self) => {
            self
                // When dragging
                .hook(gesture, () => {
                    let offset = gesture.get_offset()[1];

                    if (offset === 0) {
                        return;
                    }

                    // Slide right
                    if (offset > 0) {
                        self.setCss(`
                        margin-top: 0px; margin-bottom: 0px;
                        opacity: 1; transition: none;
                        margin-left:   ${offset}px;
                        margin-right: -${offset}px;
                    `);
                    }

                    // Slide left
                    else {
                        offset = Math.abs(offset);
                        self.setCss(`
                        margin-top: 0px; margin-bottom: 0px;
                        opacity: 1; transition: none;
                        margin-right: ${offset}px;
                        margin-left: -${offset}px;
                    `);
                    }

                    // Put a threshold on if a click is actually dragging
                    widget.attribute.dragging =
                        Math.abs(offset) > SLIDE_MIN_THRESHOLD;

                    widget.cursor = 'grabbing';
                }, 'drag-update')

                // On drag end
                .hook(gesture, () => {
                    // Make it slide in on init
                    if (!widget.attribute.ready) {
                        // Reverse of slideAway, so it started at squeeze, then we go to slide
                        self.setCss(slideIn === 'Left' ?
                            slideLeft :
                            slideRight);

                        timeout(ANIM_DURATION, () => {
                            // Then we go to center
                            self.setCss(defaultStyle);
                            timeout(ANIM_DURATION, () => {
                                widget.attribute.ready = true;
                            });
                        });

                        return;
                    }

                    const offset = gesture.get_offset()[1];

                    // If crosses threshold after letting go, slide away
                    if (Math.abs(offset) > MAX_OFFSET) {
                        if (offset > 0) {
                            widget.attribute.slideAway('Right');
                        }
                        else {
                            widget.attribute.slideAway('Left');
                        }
                    }
                    else {
                        self.setCss(defaultStyle);
                        widget.cursor = 'grab';
                        widget.attribute.dragging = false;
                    }
                }, 'drag-end');
        },
    }));

    return widget;
};