import { CanvasNodeType, type CanvasMediaPerformanceMode, type CanvasNodeData } from "@/types/canvas";

const STORAGE_KEY = "canvas-media-performance-mode";

export function readCanvasMediaPerformanceMode(): CanvasMediaPerformanceMode {
    try {
        const stored = window.localStorage.getItem(STORAGE_KEY);
        return stored === "quality" || stored === "performance" ? stored : "auto";
    } catch {
        return "auto";
    }
}

export function persistCanvasMediaPerformanceMode(mode: CanvasMediaPerformanceMode) {
    try {
        window.localStorage.setItem(STORAGE_KEY, mode);
    } catch {
        // 浏览器禁用本地存储时保留当前会话内的选择。
    }
}

export function shouldReduceCanvasMediaEffects(mode: CanvasMediaPerformanceMode, nodes: CanvasNodeData[]) {
    if (mode === "performance") return true;
    if (mode === "quality") return false;
    const mediaCount = nodes.filter((node) => node.type === CanvasNodeType.Image || node.type === CanvasNodeType.Video || node.type === CanvasNodeType.Audio).length;
    return nodes.length >= 80 || mediaCount >= 32;
}