/*
const ctx = new ContextMenu();

ctx.setItems([
    { label: "Öffnen", disable: true, onClick: () => alert("Öffnen!") },
    { label: "Öffnen", onClick: () => alert("Öffnen!") },
    { label: "Bearbeiten", onClick: () => alert("Bearbeiten…") },
    { type: "divider" },
    { 
        label: "Mehr Optionen",
        color: 'rgb()|color-name|color-value',
        children: [
            { label: "Duplizieren", onClick: () => alert("Dupliziert!") },
            { label: "Umbenennen", onClick: () => alert("Rename…") },
            { 
                label: "Exportieren",
                children: [
                    { label: "PDF", onClick: () => alert("PDF export") },
                    { label: "CSV", onClick: () => alert("CSV export") },
                ]
            }
        ]
    },
    { label: "Löschen", onClick: () => alert("Gelöscht!") },
]);

ctx.show(element, or location, { position: "right" });
*/


class ContextMenu {
    constructor() {
        this.menu = document.createElement("div");
        this.menu.className = "ctx-menu hidden";
        document.body.appendChild(this.menu);

        // close on click outside → sofort
        document.addEventListener("click", (e) => {
            if (!this.menu.contains(e.target)) {
                this.closeAllSubmenus();
                this.hide();
            }
        });

        window.addEventListener("resize", () => this.hide());
        window.addEventListener("scroll", () => this.hide());
    }

    setItems(items) {
        this.menu.innerHTML = "";
        this.menu.appendChild(this.buildMenu(items));
    }

    buildMenu(items) {
        const ul = document.createElement("ul");
        ul.className = "ctx-list";

        items.forEach(item => {
            if (item.type === "divider") {
                const divider = document.createElement("li");
                divider.className = "ctx-divider";
                ul.appendChild(divider);
                return;
            }

            const li = document.createElement("li");
            li.className = "ctx-item";

            if (item.color) li.style.boxShadow = `inset 5px 0px 0px 0px ${item.color}`;
            if (item.disabled) li.classList.add("ctx-disabled");

            li.innerHTML = `
                <span class="ctx-label">${item.label}</span>
                ${item.children ? "<span class='ctx-arrow'>▶</span>" : ""}
            `;

            if (item.onClick && !item.children && !item.disabled) {
                li.addEventListener("click", e => {
                    e.stopPropagation();
                    item.onClick(e);
                    this.hide(); // Hauptmenü sofort schließen
                });
            }

            if (item.children) {
                const submenu = this.buildMenu(item.children);
                submenu.classList.add("ctx-submenu");
                li.appendChild(submenu);

                let hideTimeout;

                const openSubmenu = () => {
                    clearTimeout(hideTimeout);
                    submenu.classList.add("open");

                    submenu.style.left = "";
                    submenu.style.top = "";

                    const liRect = li.getBoundingClientRect();
                    const submenuRect = submenu.getBoundingClientRect();

                    let left = li.offsetWidth;
                    if (liRect.right + submenuRect.width > window.innerWidth) left = -submenuRect.width;
                    submenu.style.left = left + "px";

                    let top = 0;
                    if (liRect.top + submenuRect.height > window.innerHeight) {
                        top = window.innerHeight - (liRect.top + submenuRect.height) - 4;
                    }
                    submenu.style.top = top + "px";
                };

                const closeSubmenu = (delay = 500) => {
                    clearTimeout(hideTimeout);
                    hideTimeout = setTimeout(() => {
                        submenu.classList.remove("open");
                        submenu.style.left = "";
                        submenu.style.top = "";
                    }, delay);
                };

                li.addEventListener("mouseenter", openSubmenu);
                li.addEventListener("mouseleave", () => closeSubmenu(500));
                submenu.addEventListener("mouseenter", () => clearTimeout(hideTimeout));
                submenu.addEventListener("mouseleave", () => closeSubmenu(500));
            }

            ul.appendChild(li);
        });

        return ul;
    }

    closeAllSubmenus() {
        this.menu.querySelectorAll(".ctx-submenu.open").forEach(sm => {
            sm.classList.remove("open");
            sm.style.left = "";
            sm.style.top = "";
        });
    }

    show(target, options = {}) {
        // this.hide();
        this.closeAllSubmenus();

        let x, y;

        const position = options.position || "right"; // default
        const offset = options.offset || 4;

        // 🖱️ Mausposition
        if (typeof target === "number") {
            x = target;
            y = options.y;
        }

        // 📦 Element als Anchor
        else if (target instanceof HTMLElement) {
            const rect = target.getBoundingClientRect();

            switch (position) {
                case "right":
                    x = rect.right + offset;
                    y = rect.top;
                    break;

                case "left":
                    x = rect.left - this.menu.offsetWidth - offset;
                    y = rect.top;
                    break;

                case "top":
                    x = rect.left;
                    y = rect.top - this.menu.offsetHeight - offset;
                    break;

                case "bottom":
                default:
                    x = rect.left;
                    y = rect.bottom + offset;
                    break;
            }
        }

        // ❌ invalid fallback
        else {
            return;
        }

        // 👉 erstmal anzeigen (wichtig für width/height!)
        this.menu.style.left = "0px";
        this.menu.style.top = "0px";
        this.menu.classList.add("show");
        this.menu.classList.remove("hidden");

        const rect = this.menu.getBoundingClientRect();

        // 🧠 Reposition nach echten Maßen
        if (target instanceof HTMLElement) {
            const anchor = target.getBoundingClientRect();

            switch (position) {
                case "right":
                    x = anchor.right + offset;
                    y = anchor.top;
                    break;

                case "left":
                    x = anchor.left - rect.width - offset;
                    y = anchor.top;
                    break;

                case "top":
                    x = anchor.left;
                    y = anchor.top - rect.height - offset;
                    break;

                case "bottom":
                    x = anchor.left;
                    y = anchor.bottom + offset;
                    break;
            }
        }

        // 🧱 Screen Bounds
        if (x + rect.width > window.innerWidth) {
            x = window.innerWidth - rect.width - 4;
        }

        if (y + rect.height > window.innerHeight) {
            y = window.innerHeight - rect.height - 4;
        }

        if (x < 0) x = 4;
        if (y < 0) y = 4;

        this.menu.style.left = x + "px";
        this.menu.style.top = y + "px";
    }

    hide() {
        this.menu.classList.remove("show");
        setTimeout(() => this.menu.classList.add("hidden"), 200);
    }
}