const isMobileSafari = (() => {
    let v = navigator.userAgent.match(/Version\/(?<version>\S+) Mobile\/\S+/);
    if (v && v.groups.version) { // Safari
        return true;
    }
    return false;
})();

export class ContextMenuWidget {
    constructor() {
        this.menuItems = [];
        this.menuItemsUpdated = true;

        this.initDom();
    }

    initDom() {
        let menuContainer = document.createElement('div');
        menuContainer.id = 'iseai-contextmenu';
        menuContainer.className = 'oo-ui-toolGroup-tools oo-ui-popupToolGroup-tools oo-ui-listToolGroup-tools oo-ui-toolGroup-enabled-tools oo-ui-popupToolGroup-active-tools';
        menuContainer.style.minWidth = 'unset';
        menuContainer.style.display = 'none';
        this.menuContainer = menuContainer;

        let menuCover = document.createElement('div');
        menuCover.className = 'isekai-contextmenu-cover';
        menuCover.style.display = 'none';
        menuCover.addEventListener('click', () => {
            this.hide();
        });
        this.menuCover = menuCover;

        document.body.appendChild(menuContainer);
        document.body.appendChild(menuCover);
    }

    setMenuItem(menuItems) {
        this.menuItems = menuItems;
        this.menuItemsUpdated = true;
    }

    updateMenuItemDom() {
        if (this.menuItemsUpdated) {
            this.menuContainer.innerHTML = '';

            this.menuItems.sort((a, b) => {
                return (b.priority ?? 0) - (a.priority ?? 0);
            }).forEach((menuItem) => {
                let menuElem = document.createElement('span');
                menuElem.className = 'oo-ui-widget oo-ui-widget-enabled oo-ui-tool';

                let menuLink = document.createElement('a');
                menuLink.className = 'oo-ui-tool-link';
                menuLink.tabIndex = 0;
                menuLink.role = 'button';
                menuLink.addEventListener('click', (e) => {
                    e.preventDefault();
                    menuItem.onClick?.();
                    this.hide();
                });

                let menuLabel = document.createElement('span');
                menuLabel.className = 'oo-ui-tool-title';
                menuLabel.innerText = menuItem.label;

                menuLink.appendChild(menuLabel);
                menuElem.appendChild(menuLink);
                this.menuContainer.appendChild(menuElem);
            });

            this.menuItemsUpdated = false;
        }
    }

    show(...args) {
        let x = 0;
        let y = 0;
        if (args[0] instanceof MouseEvent) {
            x = args[0].clientX;
            y = args[0].clientY;
        } else if (args[0] instanceof Element) {
            let rect = args[0].getBoundingClientRect();
            x = rect.left;
            y = rect.top;
        } else if (args.length === 2 && typeof args[0] === 'number' && typeof args[1] === 'number') {
            x = args[0];
            y = args[1];
        }

        if (this.menuItemsUpdated) {
            this.updateMenuItemDom();
        }
        
        this.menuContainer.style.display = 'block';
        this.menuCover.style.display = 'block';

        let menuWidth = this.menuContainer.clientWidth;
        let menuHeight = this.menuContainer.clientHeight;

        if (x + menuWidth > window.innerWidth) {
            x -= menuWidth;
        }
        if (y + menuHeight > window.innerHeight) {
            y -= menuHeight;
        }

        this.menuContainer.style.left = x + 'px';
        this.menuContainer.style.top = y + 'px';
    }

    hide() {
        this.menuContainer.style.display = 'none';
        this.menuCover.style.display = 'none';
    }

    bindToDom(dom) {
        dom.addEventListener('contextmenu', (e) => {
            e.preventDefault();
            this.show(e);
        });

        if (isMobileSafari) {
            // Safari下对长按的特殊处理
            let longPressTimer;

            dom.addEventListener('touchstart', (e) => {
                document.body.classList.add('isekai-contextmenu-ios-longpress');

                longPressTimer = setTimeout(() => {
                    e.preventDefault();
                    this.show({
                        x: e.pageX - window.scrollX,
                        y: e.pageY - window.scrollY
                    });
                }, 200);
            });

            dom.addEventListener('touchend', function (e) {
                document.body.classList.remove('isekai-contextmenu-ios-longpress');

                if (longPressTimer) {
                    clearInterval(longPressTimer);
                }
            });
        }
    }
}