export const VIDEO_WATERMARK_RULES_STORAGE_KEY = "video-canvas-watermark-rules-v1";

export type VideoCanvasVideoDownloadConfig = {
  acknowledgementText: string;
  applicationText: string;
  responsibilityText: string;
  rulesLinkLabel: string;
  rulesTitle: string;
  rulesUrl: string;
  welcomeText: string;
};

export const defaultVideoCanvasVideoDownloadConfig: VideoCanvasVideoDownloadConfig = {
  acknowledgementText:
    '开启本功能开关并点击 "保存设置" 按钮，即视为您已充分知悉并同意本规则全部内容。后续您可通过 "头像 - AI水印设置" 路径调整本功能配置。',
  applicationText:
    '您申请我们向您提供没有添加显式标识（以下或称"水印"）的AI生成合成内容之前，亦即您使用"去水印"功能之前，请您务必认真阅读并充分理解本规则。您知悉、同意并遵守以下内容的，方可使用本功能。',
  responsibilityText:
    "经您提出申请，{{siteName}}平台可向您提供未添加前述显式标识的AI生成合成内容。请注意：您在使用网络信息内容传播服务发布该等AI生成合成内容时，需主动作出声明，并通过传播{{siteName}}平台提供的标识功能完成标识操作。您确认已知晓并承诺：若您未依据法律法规要求在AI生成合成内容中添加显式标识，进而引发公众混淆或误认，由此产生的全部后果及法律责任均由您自行承担。更详细的说明见",
  rulesLinkLabel: "{{siteName}}水印规范",
  rulesTitle: "AI 生成内容水印管理规则",
  rulesUrl: "https://resonate.feishu.cn/wiki/",
  welcomeText: "欢迎您使用{{siteName}}的产品和服务！",
};

function normalizeDownloadCopy(value: unknown, fallback: string, maxLength: number) {
  const normalized = typeof value === "string" ? value.trim().slice(0, maxLength) : "";
  return normalized || fallback;
}

function normalizeRulesUrl(value: unknown, fallback: string) {
  const candidate = typeof value === "string" ? value.trim().slice(0, 2048) : "";
  if (candidate.startsWith("/") && !candidate.startsWith("//")) return candidate;
  try {
    const url = new URL(candidate);
    return url.protocol === "http:" || url.protocol === "https:" ? candidate : fallback;
  } catch {
    return fallback;
  }
}

export function normalizeVideoCanvasVideoDownloadConfig(
  value: unknown,
): VideoCanvasVideoDownloadConfig {
  const incoming = value && typeof value === "object" && !Array.isArray(value)
    ? value as Record<string, unknown>
    : {};
  const fallback = defaultVideoCanvasVideoDownloadConfig;
  return {
    acknowledgementText: normalizeDownloadCopy(
      incoming.acknowledgementText,
      fallback.acknowledgementText,
      2_000,
    ),
    applicationText: normalizeDownloadCopy(incoming.applicationText, fallback.applicationText, 4_000),
    responsibilityText: normalizeDownloadCopy(
      incoming.responsibilityText,
      fallback.responsibilityText,
      6_000,
    ),
    rulesLinkLabel: normalizeDownloadCopy(incoming.rulesLinkLabel, fallback.rulesLinkLabel, 120),
    rulesTitle: normalizeDownloadCopy(incoming.rulesTitle, fallback.rulesTitle, 120),
    rulesUrl: normalizeRulesUrl(incoming.rulesUrl, fallback.rulesUrl),
    welcomeText: normalizeDownloadCopy(incoming.welcomeText, fallback.welcomeText, 500),
  };
}

export function resolveVideoDownloadRuleCopy(value: string, siteName: string) {
  return value.replaceAll("{{siteName}}", siteName.trim() || "AI平台");
}

const VIDEO_EXTENSION_BY_CONTENT_TYPE: Record<string, string> = {
  "video/mp4": "mp4",
  "video/quicktime": "mov",
  "video/webm": "webm",
};

export function sanitizeVideoDownloadTitle(value: string) {
  return (value.trim() || "视频").replace(/[\\/:*?"<>|]+/g, "-").slice(0, 80);
}

export function getVideoDownloadExtension(source: string, contentType = "") {
  const normalizedContentType = contentType.split(";", 1)[0]?.trim().toLowerCase();
  if (normalizedContentType && VIDEO_EXTENSION_BY_CONTENT_TYPE[normalizedContentType]) {
    return VIDEO_EXTENSION_BY_CONTENT_TYPE[normalizedContentType];
  }

  try {
    const pathname = new URL(source, "https://canvas.local").pathname;
    const extension = pathname.match(/\.([a-z0-9]{2,5})$/i)?.[1]?.toLowerCase();
    if (extension && ["mp4", "mov", "m4v", "webm"].includes(extension)) return extension;
  } catch {
    // Fall through to the interoperable video default.
  }

  return "mp4";
}

export function getVideoDownloadFilename(title: string, source: string, contentType = "") {
  return `${sanitizeVideoDownloadTitle(title)}.${getVideoDownloadExtension(source, contentType)}`;
}