/** 字幕样式预设（对齐 Electron 常用底部白字黑边，供 ffmpeg force_style） */
export const SUBTITLE_TEMPLATES = [
  {
    id: "default",
    label: "默认白字黑边",
    fontName: "Microsoft YaHei",
    fontSize: 24,
    primaryColor: "#FFFFFF",
    outlineColor: "#000000",
    outline: 2,
    marginV: 40,
  },
  {
    id: "large",
    label: "大号字幕",
    fontName: "Microsoft YaHei",
    fontSize: 32,
    primaryColor: "#FFFFFF",
    outlineColor: "#000000",
    outline: 3,
    marginV: 48,
  },
  {
    id: "yellow",
    label: "黄色强调",
    fontName: "Microsoft YaHei",
    fontSize: 26,
    primaryColor: "#FFD700",
    outlineColor: "#000000",
    outline: 2,
    marginV: 42,
  },
];

/**
 * @param {string} templateId
 */
export function getSubtitleTemplate(templateId) {
  return (
    SUBTITLE_TEMPLATES.find((t) => t.id === templateId) ||
    SUBTITLE_TEMPLATES[0]
  );
}

/**
 * @param {{ fontName?: string, fontSize?: number, primaryColor?: string, outlineColor?: string, outline?: number, marginV?: number }} tpl
 */
export function buildFfmpegForceStyle(tpl) {
  const hexToAss = (hex) => {
    const h = hex.replace("#", "");
    const r = h.substring(0, 2);
    const g = h.substring(2, 4);
    const b = h.substring(4, 6);
    return `&H00${b}${g}${r}`.toUpperCase();
  };
  const fontName = tpl.fontName || "Microsoft YaHei";
  const fontSize = tpl.fontSize || 24;
  const primary = hexToAss(tpl.primaryColor || "#FFFFFF");
  const outline = hexToAss(tpl.outlineColor || "#000000");
  const outlineW = tpl.outline ?? 2;
  const marginV = tpl.marginV ?? 40;
  return `FontName=${fontName},FontSize=${fontSize},PrimaryColour=${primary},OutlineColour=${outline},Outline=${outlineW},Alignment=2,MarginV=${marginV}`;
}