/**
 * RbxlHudOverlay — DOM-оверлей с HUD-элементами для импортированных
 * Roblox-карт: KillFeed (правый верх), Message/Hint (центр), WinGui.
 *
 * Один контейнер `.rbxl-hud-overlay` на canvas.parentElement, в нём дочерние
 * блоки по типу. Стили inline, ничего не зависит от CSS приложения.
 *
 * API:
 *   const hud = new RbxlHudOverlay(canvasParent);
 *   hud.addKillFeed(killer, victim, weapon)
 *   hud.showMessage(text, opts)
 *   hud.hideMessage()
 *   hud.showWin(text)
 *   hud.dispose()
 */

export class RbxlHudOverlay {
    constructor(parent) {
        this._parent = parent || document.body;
        this._root = null;
        this._killFeed = null;
        this._message = null;
        this._winBox = null;
        this._killEntries = [];      // [{el, expireAt}]
        this._mount();
    }

    _mount() {
        if (this._root) return;
        const root = document.createElement('div');
        root.className = 'rbxl-hud-overlay';
        Object.assign(root.style, {
            position: 'absolute',
            inset: '0',
            pointerEvents: 'none',
            zIndex: '999',
            fontFamily: 'system-ui, -apple-system, "Segoe UI", sans-serif',
        });
        this._parent.appendChild(root);
        this._root = root;

        // KillFeed — правый верхний угол
        const kf = document.createElement('div');
        Object.assign(kf.style, {
            position: 'absolute',
            top: '60px',
            right: '12px',
            display: 'flex',
            flexDirection: 'column',
            gap: '6px',
            maxWidth: '320px',
            pointerEvents: 'none',
        });
        root.appendChild(kf);
        this._killFeed = kf;

        // Message — центр сверху (Roblox Message по центру экрана,
        // но в верхней трети чтобы не мешать игре)
        const msg = document.createElement('div');
        Object.assign(msg.style, {
            position: 'absolute',
            top: '15%',
            left: '50%',
            transform: 'translateX(-50%)',
            padding: '10px 24px',
            background: 'rgba(0,0,0,0.6)',
            color: '#fff',
            fontSize: '22px',
            fontWeight: '600',
            borderRadius: '6px',
            textShadow: '0 2px 4px rgba(0,0,0,0.8)',
            display: 'none',
            pointerEvents: 'none',
        });
        root.appendChild(msg);
        this._message = msg;

        // WinGui — большая надпись по центру
        const win = document.createElement('div');
        Object.assign(win.style, {
            position: 'absolute',
            top: '50%',
            left: '50%',
            transform: 'translate(-50%, -50%)',
            padding: '24px 48px',
            background: 'rgba(0,0,0,0.75)',
            color: '#ffd86b',
            fontSize: '48px',
            fontWeight: '800',
            borderRadius: '12px',
            textShadow: '0 4px 8px rgba(0,0,0,0.8)',
            display: 'none',
            pointerEvents: 'none',
        });
        root.appendChild(win);
        this._winBox = win;

        // Тик для авто-исчезновения KillFeed entries (через 5с)
        this._tickInterval = setInterval(() => this._cleanupKills(), 500);
    }

    addKillFeed(killer, victim, weapon) {
        if (!this._killFeed) return;
        const entry = document.createElement('div');
        Object.assign(entry.style, {
            background: 'rgba(0,0,0,0.55)',
            color: '#fff',
            padding: '6px 10px',
            borderRadius: '4px',
            fontSize: '13px',
            display: 'flex',
            gap: '6px',
            alignItems: 'center',
            animation: 'rbxlHudFadeIn 0.3s',
        });
        const killerEl = document.createElement('span');
        killerEl.textContent = String(killer || '?');
        killerEl.style.color = '#5bd1e8';
        const arrow = document.createElement('span');
        arrow.textContent = weapon ? `→ [${weapon}] →` : '→';
        arrow.style.color = '#ff9a52';
        const victimEl = document.createElement('span');
        victimEl.textContent = String(victim || '?');
        victimEl.style.color = '#f87a7a';
        entry.appendChild(killerEl);
        entry.appendChild(arrow);
        entry.appendChild(victimEl);
        this._killFeed.appendChild(entry);
        this._killEntries.push({ el: entry, expireAt: performance.now() + 5000 });
        // Keep only last 8
        while (this._killEntries.length > 8) {
            const old = this._killEntries.shift();
            try { old.el.remove(); } catch (_) {}
        }
    }

    _cleanupKills() {
        const now = performance.now();
        const keep = [];
        for (const e of this._killEntries) {
            if (e.expireAt < now) { try { e.el.remove(); } catch (_) {} }
            else keep.push(e);
        }
        this._killEntries = keep;
    }

    showMessage(text, opts = {}) {
        if (!this._message) return;
        this._message.textContent = String(text || '');
        this._message.style.display = text ? 'block' : 'none';
        if (opts.duration) {
            clearTimeout(this._msgTimer);
            this._msgTimer = setTimeout(() => this.hideMessage(), opts.duration);
        }
    }

    hideMessage() {
        if (this._message) this._message.style.display = 'none';
    }

    showWin(text) {
        if (!this._winBox) return;
        this._winBox.textContent = String(text || '');
        this._winBox.style.display = 'block';
        // Auto-hide через 6с
        clearTimeout(this._winTimer);
        this._winTimer = setTimeout(() => { if (this._winBox) this._winBox.style.display = 'none'; }, 6000);
    }

    dispose() {
        try { this._root?.remove(); } catch (_) {}
        clearInterval(this._tickInterval);
        clearTimeout(this._msgTimer);
        clearTimeout(this._winTimer);
        this._root = null;
    }
}