import type { ChangelogRelease } from "@/lib/changelog";
import type { LatestReleaseInfo } from "@/lib/latestRelease";

type LandingLatestUpdates = {
  version: string;
  title: string;
  desc: string;
  link: string;
  items: string[];
};

const text = {
  en: {
    title: "Latest updates",
    desc: "Mirrored from the latest GitHub release notes.",
    link: "Read the changelog",
    fallbackItems: ["Desktop and Docker release assets", "Database workflow improvements", "Bug fixes and reliability updates", "Documentation and packaging updates"],
  },
  cn: {
    title: "最近更新",
    desc: "同步 GitHub 最新 Release Notes。",
    link: "查看更新日志",
    fallbackItems: ["桌面版与 Docker 发布资产", "数据库工作流改进", "问题修复与稳定性更新", "文档与打包流程更新"],
  },
};

function releaseItems(release: ChangelogRelease, lang: "en" | "cn") {
  const separator = lang === "cn" ? "，" : ": ";

  return release.sections
    .flatMap((section) => section.items)
    .map((item) => (item.desc ? `${item.title}${separator}${item.desc}` : item.title))
    .slice(0, 4);
}

export function buildLandingLatestUpdates(lang: "en" | "cn", release: ChangelogRelease | undefined, appVersion: string, latestRelease?: LatestReleaseInfo | null): LandingLatestUpdates {
  const t = text[lang];
  const items = release ? releaseItems(release, lang) : [];
  const version = latestRelease?.version ? `v${latestRelease.version}` : (release?.tag ?? `v${appVersion}`);

  return {
    version,
    title: t.title,
    desc: t.desc,
    link: t.link,
    items: items.length > 0 ? items : t.fallbackItems,
  };
}