src/components/features/FontManager.astro

---
import { siteConfig } from "@/config";

const { font: fontConfig } = siteConfig;

// 获取选中的字体
const getSelectedFonts = () => {
	if (!fontConfig.enable || !fontConfig.selected) return [];

	const selectedIds = Array.isArray(fontConfig.selected)
		? fontConfig.selected
		: [fontConfig.selected];

	return selectedIds
		.map((id) => fontConfig.fonts[id])
		.filter((font) => font?.src); // 过滤掉系统字体和不存在的字体
};

const selectedFonts = getSelectedFonts();

// 生成字体CSS类名
const generateFontClasses = () => {
	if (!fontConfig.enable) return [];

	const selectedIds = Array.isArray(fontConfig.selected)
		? fontConfig.selected
		: [fontConfig.selected];

	return selectedIds.map((id) => `font-${id}-enabled`);
};

const fontClasses = generateFontClasses();

// 生成font-family回退样式
const generateFontFamilyStyle = () => {
	if (!fontConfig.enable || !fontConfig.selected) return "";

	const selectedIds = Array.isArray(fontConfig.selected)
		? fontConfig.selected
		: [fontConfig.selected];

	const selectedFontFamilies = selectedIds
		.map((id) => fontConfig.fonts[id])
		.filter((font) => font)
		.map((font) => `"${font.family}"`);

	if (selectedFontFamilies.length === 0) return "";

	const fallbacks = fontConfig.fallback || [];
	const allFonts = [...selectedFontFamilies, ...fallbacks];

	return `font-family: ${allFonts.join(", ")};`;
};

const fontFamilyStyle = generateFontFamilyStyle();
---

<!-- 字体样式表链接 -->{
  selectedFonts.map((font) => {
    // 判断是否为外部链接
    const isExternalUrl =
      font.src.startsWith("http://") ||
      font.src.startsWith("https://") ||
      font.src.startsWith("//");

    if (isExternalUrl) {
      // 外部字体链接 (如 Google Fonts, CDN等)
      return <link rel="stylesheet" href={font.src} />;
    } else {
      // 本地字体文件
      return (
        <style
          set:html={`
        @font-face {
          font-family: "${font.family}";
          src: url("${font.src}") ${font.format ? `format("${font.format}")` : ""};
          ${font.weight ? `font-weight: ${font.weight};` : ""}
          ${font.style ? `font-style: ${font.style};` : ""}
          ${font.display ? `font-display: ${font.display};` : ""}
          ${font.unicodeRange ? `unicode-range: ${font.unicodeRange};` : ""}
        }
      `}
        />
      );
    }
  })
}

<!-- 字体预加载链接 -->
{
  fontConfig.enable &&
    fontConfig.preload &&
    selectedFonts
      .filter((font) => !font.src.startsWith("http"))
      .map((font) => (
        <link
          rel="preload"
          href={font.src}
          as="font"
          type={`font/${font.format || "woff2"}`}
          crossorigin
        />
      ))
}

<!-- 全局字体样式 -->
{
  fontConfig.enable && fontFamilyStyle && (
    <style
      set:html={`
    :root {
      --font-family-custom: ${selectedFonts.map((font) => `"${font.family}"`).join(", ")};
      --font-family-fallback: ${(fontConfig.fallback || []).join(", ")};
    }
    
    /* 应用自定义字体到body */
    body {
      ${fontFamilyStyle}
    }
    
    /* 为每个选中的字体生成对应的CSS类 */
    ${selectedFonts
      .map((font) => {
        return `
        .font-${font.id},
        .font-${font.id} * {
          font-family: "${font.family}", var(--font-family-fallback) !important;
        }
      `;
      })
      .join("\n")}
    
    /* 为整体启用字体的body添加类名 */
    ${fontClasses.map((className) => `.${className}`).join(",\n")} {
      /* 字体相关的全局样式可以在这里添加 */
    }
  `}
    />
  )
}

<script>
  // 字体加载优化和错误处理
  if (document.fonts && typeof document.fonts.ready !== "undefined") {
    document.fonts.ready
      .then(() => {
        console.log("All fonts have been loaded");

        // 触发自定义事件，通知字体加载完成
        document.dispatchEvent(new CustomEvent("fontsLoaded"));
      })
      .catch((error: Error) => {
        console.warn("Font loading failed:", error);
      });
  }

  // 字体加载性能监控
  if (typeof PerformanceObserver !== "undefined") {
    const observer = new PerformanceObserver((list) => {
      list.getEntries().forEach((entry) => {
        if (entry.entryType === "resource") {
          // console.log(`Font resource loaded: ${entry.name} (${entry.duration.toFixed(2)}ms)`);
        }
      });
    });

    try {
      observer.observe({ entryTypes: ["resource"] });
    } catch (e) {
      // 浏览器不支持时静默失败
    }
  }
</script>