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

const { Gtk } = imports.gi;

const MAX_OFFSET = 200;
const OFFSCREEN = 500;
const ANIM_DURATION = 500;
const TRANSITION = `transition: margin ${ANIM_DURATION}ms ease,
                                opacity ${ANIM_DURATION}ms ease;`;


/**
 * @typedef {import('types/widgets/overlay').OverlayProps} OverlayProps
 * @typedef {import('types/widgets/overlay').default} Overlay
 *
 * @param {OverlayProps & {
 *      setup?: function(Overlay):void
 * }} o
 */
export default ({
    attribute = {},
    setup = () => {/**/},
    ...props
}) => {
    const widget = EventBox();
    const gesture = Gtk.GestureDrag.new(widget);

    // Have empty PlayerBox to define the size of the widget
    const emptyPlayer = Box({
        class_name: 'player',
        attribute: { empty: true },
    });

    const content = Overlay({
        ...props,
        attribute: {
            ...attribute,
            dragging: false,

            list: () => content.get_children()
                // @ts-expect-error
                .filter((ch) => !ch.attribute?.empty),

            /** @param {Overlay} playerW */
            includesWidget: (playerW) => {
                return Array.from(content.attribute.list())
                    .find((w) => w === playerW);
            },

            showTopOnly: () => Array.from(content.attribute.list())
                .forEach((over) => {
                    over.visible = over === content.attribute.list().at(-1);
                }),

            /** @param {import('types/widgets/centerbox').default} player */
            moveToTop: (player) => {
                player.visible = true;
                content.reorder_overlay(player, -1);
                timeout(ANIM_DURATION, () => {
                    content.attribute.showTopOnly();
                });
            },
        },

        child: emptyPlayer,

        setup: (self) => {
            setup(self);

            self
                .hook(gesture,
                    /**
                     * @param {Overlay} overlay
                     * @param {number} realGesture
                     */
                    (overlay, realGesture) => {
                        if (realGesture) {
                            Array.from(overlay.attribute.list())
                                .forEach((over) => {
                                    over.visible = true;
                                });
                        }
                        else {
                            overlay.attribute.showTopOnly();
                        }

                        // Don't allow gesture when only one player
                        if (overlay.attribute.list().length <= 1) {
                            return;
                        }

                        overlay.attribute.dragging = true;
                        let offset = gesture.get_offset()[1];
                        const playerBox = overlay.attribute.list().at(-1);

                        if (!offset) {
                            return;
                        }

                        // Slide right
                        if (offset >= 0) {
                            playerBox.setCss(`
                            margin-left:   ${offset}px;
                            margin-right: -${offset}px;
                            ${playerBox.attribute.bgStyle}
                        `);
                        }

                        // Slide left
                        else {
                            offset = Math.abs(offset);
                            playerBox.setCss(`
                            margin-left: -${offset}px;
                            margin-right: ${offset}px;
                            ${playerBox.attribute.bgStyle}
                        `);
                        }
                    },
                    'drag-update')


                .hook(gesture,
                    /** @param {Overlay} overlay */
                    (overlay) => {
                        // Don't allow gesture when only one player
                        if (overlay.attribute.list().length <= 1) {
                            return;
                        }

                        overlay.attribute.dragging = false;
                        const offset = gesture.get_offset()[1];

                        const playerBox = overlay.attribute.list().at(-1);

                        // If crosses threshold after letting go, slide away
                        if (offset && Math.abs(offset) > MAX_OFFSET) {
                            // Disable inputs during animation
                            widget.sensitive = false;

                            // Slide away right
                            if (offset >= 0) {
                                playerBox.setCss(`
                                ${TRANSITION}
                                margin-left:   ${OFFSCREEN}px;
                                margin-right: -${OFFSCREEN}px;
                                opacity: 0.7; ${playerBox.attribute.bgStyle}
                            `);
                            }

                            // Slide away left
                            else {
                                playerBox.setCss(`
                                ${TRANSITION}
                                margin-left: -${OFFSCREEN}px;
                                margin-right: ${OFFSCREEN}px;
                                opacity: 0.7; ${playerBox.attribute.bgStyle}
                            `);
                            }

                            timeout(ANIM_DURATION, () => {
                                // Put the player in the back after anim
                                overlay.reorder_overlay(playerBox, 0);
                                // Recenter player
                                playerBox.setCss(playerBox.attribute.bgStyle);

                                widget.sensitive = true;

                                overlay.attribute.showTopOnly();
                            });
                        }
                        else {
                            // Recenter with transition for animation
                            playerBox.setCss(`${TRANSITION}
                            ${playerBox.attribute.bgStyle}`);
                        }
                    },
                    'drag-end');
        },
    });

    widget.add(content);

    return widget;
};