export type SyncLanguage = "en" | "zh";

const EN = {
  on: "ON",
  off: "OFF",
  enabled: "enabled",
  disabled: "disabled",
  keepAll: "keep all",
  cancel: "x ✕ Cancel",
  back: "b ← Back",
  save: "s ✓ Save",

  menuTitle: "Pi WebDAV Backup",
  uploadAllBackups: "⬆️  Back Up All",
  restoreAllBackups: "⬇️  Restore All (latest)",
  uploadPiBackup: "☁️  Upload Pi Backup",
  uploadSkillsBackup: "📦 Upload Skills Backup",
  uploadSessionsArchive: "🗂️  Upload Sessions Archive",
  restorePiBackup: "📥 Restore Pi Backup",
  restoreSkillsBackup: "📥 Restore Skills Backup",
  restoreSessionsArchive: "📥 Restore Sessions Archive",
  configureSettings: "⚙️  Configure Backup Settings",
  switchLanguage: "🌐 Language: English → 中文",

  configureTitle: "Configure Backup Settings",
  webdavUrl: "WebDAV URL: {value}",
  webdavUsername: "WebDAV Username: {value}",
  webdavPassword: "WebDAV Password/Token: {value}",
  piBackup: "Pi Backup: {value}",
  skillsBackup: "Shared Skills Backup: {value}",
  sessionsBackup: "Sessions Backup: {value}",
  backupOnExit: "Archive Current Project On Exit: {value}",
  piExcludePaths: "Pi Backup Exclusions: {value}",
  sessionProjects: "Session Projects: {value}",
  sessionProjectMode: "Session Project Mode: {value}",
  maxCloudBackups: "Max Cloud Backups: {value}",
  language: "Language: English",
  notSet: "(not set)",
  passwordSet: "(set)",
  none: "(none)",
  piKind: "Pi",
  skillsKind: "Skills",
  sessionsKind: "Sessions",

  setupRequired: "WebDAV is not configured. Please set it up now.",
  promptWebdavUrl: "WebDAV URL:",
  promptWebdavUsername: "WebDAV username:",
  promptWebdavPassword: "WebDAV token (or $ENV_VAR):",
  promptExcludePaths: "Excluded paths (comma separated, relative to ~/.pi/agent):",
  promptMaxBackups: "Maximum backups (0 = keep all):",
  configSaved: "Backup configuration updated.",

  backupDisabled: "{kind} backup is disabled.",
  backupUploaded: "Uploaded {filename}\n{contents}{pruned}",
  backupFailed: "{kind} backup failed: {error}",
  prunedCount: "\nPruned: {count}",
  noAllowedSessionProjects: "No allowed local session projects found.",
  archiveSessionProject: "Archive session project",
  sessionArchiveUploaded: "Uploaded {filename}\n{contents}",
  sessionArchiveFailed: "Session archive failed: {error}",

  noArchivesFound: "No {kind} archives found.",
  restoreArchive: "Restore {kind} archive",
  replaceSharedSkillsTitle: "Replace shared skills?",
  replaceSharedSkillsBody: "The current ~/.agents/skills will be moved to a timestamped backup.",
  restoreCompleted: "Restored {kind}:\n{contents}",
  restoreFailed: "{kind} restore failed: {error}",
  restoreSessionProject: "Restore session archive: project",
  selectSessionArchive: "Select session archive",
  sessionRestoreCompleted: "Session archive restored:\n{contents}",
  sessionRestoreFailed: "Session restore failed: {error}",
  noRemoteSessionProjects: "No remote session archives found.",
  confirmPiRestoreTitle: "Restore Pi backup?",
  confirmPiRestoreBody: "Entries: {count}\n{plan}",
  confirmRestoreAllTitle: "Restore all latest backups?",
  confirmRestoreAllBody: "This restores Pi, enabled Skills, and the latest archive for every allowed session project.",
  allBackupCompleted: "All backups completed:\n{results}",
  allRestoreCompleted: "Restore all completed:\n{results}",
  reloadRuntimeTitle: "Reload Runtime?",
  reloadRuntimeBody: "Reload Pi to apply the restored data?",

  projectModeWhitelist: "whitelist",
  projectModeBlacklist: "blacklist",
  projectSelectionWhitelist: "only selected projects",
  projectSelectionBlacklist: "all except selected projects",
  projectSelectionAll: "all projects",
  selectSessionProjects: "Select Session Projects [{mode}]",
  switchProjectMode: "m Switch Mode: {mode}",
  selectAllProjects: "a Select All",
  resetProjects: "r Reset",

  exitBackupFailed: "Exit session backup failed: {error}",
} as const;

export type TranslationKey = keyof typeof EN;
type TranslationParams = Record<string, string | number | boolean>;

const ZH: Record<TranslationKey, string> = {
  on: "开启",
  off: "关闭",
  enabled: "已启用",
  disabled: "已禁用",
  keepAll: "全部保留",
  cancel: "x ✕ 取消",
  back: "b ← 返回",
  save: "s ✓ 保存",

  menuTitle: "Pi WebDAV 备份",
  uploadAllBackups: "⬆️  全部备份",
  restoreAllBackups: "⬇️  全部恢复（最新）",
  uploadPiBackup: "☁️  上传 Pi 备份",
  uploadSkillsBackup: "📦 上传 Skills 备份",
  uploadSessionsArchive: "🗂️  上传会话归档",
  restorePiBackup: "📥 恢复 Pi 备份",
  restoreSkillsBackup: "📥 恢复 Skills 备份",
  restoreSessionsArchive: "📥 恢复会话归档",
  configureSettings: "⚙️  配置备份设置",
  switchLanguage: "🌐 语言：中文 → English",

  configureTitle: "配置备份设置",
  webdavUrl: "WebDAV 地址：{value}",
  webdavUsername: "WebDAV 用户名：{value}",
  webdavPassword: "WebDAV 密码/令牌：{value}",
  piBackup: "Pi 备份：{value}",
  skillsBackup: "共享 Skills 备份：{value}",
  sessionsBackup: "会话备份：{value}",
  backupOnExit: "退出时归档当前项目：{value}",
  piExcludePaths: "Pi 备份排除项：{value}",
  sessionProjects: "会话项目：{value}",
  sessionProjectMode: "会话项目模式：{value}",
  maxCloudBackups: "云端最大备份数：{value}",
  language: "语言：中文",
  notSet: "（未设置）",
  passwordSet: "（已设置）",
  none: "（无）",
  piKind: "Pi",
  skillsKind: "Skills",
  sessionsKind: "会话",

  setupRequired: "尚未配置 WebDAV，请先完成设置。",
  promptWebdavUrl: "WebDAV 地址：",
  promptWebdavUsername: "WebDAV 用户名：",
  promptWebdavPassword: "WebDAV 令牌（或 $ENV_VAR）：",
  promptExcludePaths: "排除路径（以逗号分隔，相对于 ~/.pi/agent）：",
  promptMaxBackups: "最大备份数（0 = 全部保留）：",
  configSaved: "备份配置已更新。",

  backupDisabled: "{kind} 备份已禁用。",
  backupUploaded: "已上传 {filename}\n{contents}{pruned}",
  backupFailed: "{kind} 备份失败：{error}",
  prunedCount: "\n已清理旧备份：{count} 个",
  noAllowedSessionProjects: "没有允许备份的本地会话项目。",
  archiveSessionProject: "选择要归档的会话项目",
  sessionArchiveUploaded: "已上传 {filename}\n{contents}",
  sessionArchiveFailed: "会话归档失败：{error}",

  noArchivesFound: "未找到 {kind} 归档。",
  restoreArchive: "恢复 {kind} 归档",
  replaceSharedSkillsTitle: "替换共享 Skills？",
  replaceSharedSkillsBody: "当前 ~/.agents/skills 将移动到带时间戳的备份目录。",
  restoreCompleted: "已恢复 {kind}：\n{contents}",
  restoreFailed: "{kind} 恢复失败：{error}",
  restoreSessionProject: "选择要恢复的会话项目",
  selectSessionArchive: "选择会话归档",
  sessionRestoreCompleted: "会话归档已恢复：\n{contents}",
  sessionRestoreFailed: "会话恢复失败：{error}",
  noRemoteSessionProjects: "未找到远端会话归档。",
  confirmPiRestoreTitle: "恢复 Pi 备份？",
  confirmPiRestoreBody: "归档条目：{count}\n{plan}",
  confirmRestoreAllTitle: "恢复全部最新备份？",
  confirmRestoreAllBody: "将恢复 Pi、已启用的 Skills，以及每个允许会话项目的最新归档。",
  allBackupCompleted: "全部备份完成：\n{results}",
  allRestoreCompleted: "全部恢复完成：\n{results}",
  reloadRuntimeTitle: "重新加载运行时？",
  reloadRuntimeBody: "现在重新加载 Pi 以应用恢复的数据？",

  projectModeWhitelist: "白名单",
  projectModeBlacklist: "黑名单",
  projectSelectionWhitelist: "仅所选项目",
  projectSelectionBlacklist: "除所选项目外全部",
  projectSelectionAll: "全部项目",
  selectSessionProjects: "选择会话项目［{mode}］",
  switchProjectMode: "m 切换模式：{mode}",
  selectAllProjects: "a 全选",
  resetProjects: "r 重置",

  exitBackupFailed: "退出时会话备份失败：{error}",
};

const STRINGS: Record<SyncLanguage, Record<TranslationKey, string>> = { en: EN, zh: ZH };

export function normalizeLanguage(value: unknown): SyncLanguage {
  return typeof value === "string" && value.toLowerCase().startsWith("zh") ? "zh" : "en";
}

export function t(language: SyncLanguage, key: TranslationKey, params?: TranslationParams): string {
  let message = STRINGS[language][key];
  if (!params) return message;
  for (const [name, value] of Object.entries(params)) {
    message = message.split(`{${name}}`).join(String(value));
  }
  return message;
}