import { useI18n } from "../../../shared/i18n/context";
import { translations, type TranslationKey } from "../../../shared/i18n/translations";
import { useTheme } from "../../../shared/theme/context";

const SVG_MOON = (
  <svg class="size-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5">
    <path stroke-linecap="round" stroke-linejoin="round" d="M21.752 15.002A9.72 9.72 0 0118 15.75c-5.385 0-9.75-4.365-9.75-9.75 0-1.33.266-2.597.748-3.752A9.753 9.753 0 003 11.25C3 16.635 7.365 21 12.75 21a9.753 9.753 0 009.002-5.998z" />
  </svg>
);

const SVG_SUN = (
  <svg class="size-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5">
    <path stroke-linecap="round" stroke-linejoin="round" d="M12 3v2.25m6.364.386l-1.591 1.591M21 12h-2.25m-.386 6.364l-1.591-1.591M12 18.75V21m-4.773-4.227l-1.591 1.591M5.25 12H3m4.227-4.773L5.636 5.636M15.75 12a3.75 3.75 0 11-7.5 0 3.75 3.75 0 017.5 0z" />
  </svg>
);

/**
 * Stable-width text: two invisible references (en + zh) set min-width via grid overlap.
 * The visible text overlays them, so the button never changes width on language switch.
 */
function StableText({ tKey, children, class: cls }: { tKey: TranslationKey; children: string; class?: string }) {
  return (
    <span class={`inline-grid ${cls ?? ""}`}>
      <span class="invisible col-start-1 row-start-1 whitespace-nowrap">{translations.en[tKey]}</span>
      <span class="invisible col-start-1 row-start-1 whitespace-nowrap">{translations.zh[tKey]}</span>
      <span class="col-start-1 row-start-1 whitespace-nowrap">{children}</span>
    </span>
  );
}

interface HeaderProps {
  onAddAccount: () => void;
  onCheckUpdate: () => void;
  onOpenUpdateModal?: () => void;
  checking: boolean;
  updateStatusMsg: string | null;
  updateStatusColor: string;
  version: string | null;
  commit?: string | null;
  isProxySettings?: boolean;
  hasUpdate?: boolean;
  onLogout?: () => void;
}

export function Header({ onAddAccount, onCheckUpdate, onOpenUpdateModal, checking, updateStatusMsg, updateStatusColor, version, commit, isProxySettings, hasUpdate, onLogout }: HeaderProps) {
  const { lang, toggleLang, t } = useI18n();
  const { isDark, toggle: toggleTheme } = useTheme();

  return (
    <header class="sticky top-0 z-50 w-full bg-white dark:bg-card-dark border-b border-gray-200 dark:border-border-dark shadow-sm transition-colors">
      <div class="px-4 md:px-8 lg:px-40 flex h-14 items-center justify-center">
        <div class="flex w-full max-w-[960px] items-center justify-between">
          {/* Logo & Title */}
          <div class="flex items-center gap-3">
            {isProxySettings ? (
              <a
                href="#"
                class="flex items-center gap-1.5 text-sm text-slate-500 dark:text-text-dim hover:text-primary transition-colors"
              >
                <svg class="size-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                  <path stroke-linecap="round" stroke-linejoin="round" d="M10.5 19.5L3 12m0 0l7.5-7.5M3 12h18" />
                </svg>
                <span class="font-medium">{t("backToDashboard")}</span>
              </a>
            ) : (
              <>
                <div class="flex items-center justify-center size-8 rounded-full bg-primary/10 text-primary border border-primary/20">
                  <svg class="size-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                    <path stroke-linecap="round" stroke-linejoin="round" d="M9 12.75L11.25 15 15 9.75M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
                  </svg>
                </div>
                <h1 class="text-[0.9rem] font-bold tracking-tight">Codex Proxy</h1>
              </>
            )}
          </div>
          {/* Actions */}
          <div class="flex items-center gap-2">
            <div class="hidden sm:flex items-center gap-2 px-3 py-1.5 rounded-full bg-primary/10 border border-primary/20">
              <span class="relative flex h-2.5 w-2.5">
                <span class="animate-ping absolute inline-flex h-full w-full rounded-full bg-primary opacity-75" />
                <span class="relative inline-flex rounded-full h-2.5 w-2.5 bg-primary" />
              </span>
              <StableText tKey="serverOnline" class="text-xs font-semibold text-primary">{t("serverOnline")}</StableText>
            </div>
            {/* Star on GitHub */}
            <a
              href="https://github.com/icebear0828/codex-proxy"
              target="_blank"
              rel="noopener noreferrer"
              class="hidden lg:flex items-center gap-1.5 px-3 py-1.5 rounded-full bg-amber-50 border border-amber-200 text-amber-700 dark:bg-amber-900/20 dark:border-amber-700/30 dark:text-amber-400 hover:bg-amber-100 dark:hover:bg-amber-900/40 transition-colors"
            >
              <svg class="size-3.5" viewBox="0 0 24 24" fill="currentColor">
                <path d="M12 2l3.09 6.26L22 9.27l-5 4.87 1.18 6.88L12 17.77l-6.18 3.25L7 14.14 2 9.27l6.91-1.01L12 2z" />
              </svg>
              <StableText tKey="starOnGithub" class="text-xs font-semibold">{t("starOnGithub")}</StableText>
            </a>
            {/* Check for Updates */}
            <button
              onClick={onCheckUpdate}
              disabled={checking}
              class="hidden lg:flex items-center gap-1.5 px-3 py-1.5 rounded-full border border-gray-200 dark:border-border-dark text-slate-600 dark:text-text-dim hover:bg-slate-50 dark:hover:bg-border-dark disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
            >
              <svg class={`size-3.5 ${checking ? "animate-spin" : ""}`} viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                <path stroke-linecap="round" stroke-linejoin="round" d="M16.023 9.348h4.992v-.001M2.985 19.644v-4.992m0 0h4.992m-4.992 0l3.181 3.183a8.25 8.25 0 0013.803-3.7M4.031 9.865a8.25 8.25 0 0113.803-3.7l3.181 3.182M20.985 4.356v4.992" />
              </svg>
              <StableText tKey="checkForUpdates" class="text-xs font-semibold">{checking ? t("checkingUpdates") : t("checkForUpdates")}</StableText>
            </button>
            {/* Update status message */}
            {updateStatusMsg && !checking && (
              <button
                onClick={hasUpdate && onOpenUpdateModal ? onOpenUpdateModal : onCheckUpdate}
                class={`hidden lg:inline whitespace-nowrap text-xs font-medium ${updateStatusColor} hover:underline`}
              >
                {updateStatusMsg}
              </button>
            )}
            {/* Logout (remote sessions only) */}
            {onLogout && (
              <button
                onClick={onLogout}
                class="flex items-center gap-1.5 px-3 py-1.5 rounded-full border border-gray-200 dark:border-border-dark text-slate-600 dark:text-text-dim hover:bg-slate-50 dark:hover:bg-border-dark transition-colors"
              >
                <svg class="size-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                  <path stroke-linecap="round" stroke-linejoin="round" d="M15.75 9V5.25A2.25 2.25 0 0013.5 3h-6a2.25 2.25 0 00-2.25 2.25v13.5A2.25 2.25 0 007.5 21h6a2.25 2.25 0 002.25-2.25V15m3 0l3-3m0 0l-3-3m3 3H9" />
                </svg>
                <span class="hidden sm:inline"><StableText tKey="dashboardLogout" class="text-xs font-semibold">{t("dashboardLogout")}</StableText></span>
              </button>
            )}
            {/* Language Toggle */}
            <button
              onClick={toggleLang}
              class="p-2 rounded-lg text-slate-500 dark:text-text-dim hover:bg-slate-100 dark:hover:bg-border-dark transition-colors"
              title={"\u4e2d/EN"}
            >
              <span class="text-xs font-bold inline-flex items-center justify-center w-5">{lang === "en" ? "EN" : "\u4e2d"}</span>
            </button>
            {/* Theme Toggle */}
            <button
              onClick={toggleTheme}
              class="p-2 rounded-lg text-slate-500 dark:text-text-dim hover:bg-slate-100 dark:hover:bg-border-dark transition-colors"
              title={t("toggleTheme")}
            >
              {isDark ? SVG_SUN : SVG_MOON}
            </button>
            {/* Proxy Settings / Add Account */}
            {isProxySettings ? null : (
              <>
                <a
                  href="#/proxy-settings"
                  class="hidden md:flex items-center gap-1.5 px-3 py-1.5 rounded-full border border-gray-200 dark:border-border-dark text-slate-600 dark:text-text-dim hover:bg-slate-50 dark:hover:bg-border-dark transition-colors"
                >
                  <svg class="size-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                    <path stroke-linecap="round" stroke-linejoin="round" d="M10.5 6h9.75M10.5 6a1.5 1.5 0 11-3 0m3 0a1.5 1.5 0 10-3 0M3.75 6H7.5m3 12h9.75m-9.75 0a1.5 1.5 0 01-3 0m3 0a1.5 1.5 0 00-3 0m-3.75 0H7.5m9-6h3.75m-3.75 0a1.5 1.5 0 01-3 0m3 0a1.5 1.5 0 00-3 0m-9.75 0h9.75" />
                  </svg>
                  <StableText tKey="proxySettings" class="text-xs font-semibold">{t("proxySettings")}</StableText>
                </a>
                <button
                  onClick={onAddAccount}
                  class="flex items-center gap-2 px-4 py-2 bg-primary hover:bg-primary-hover text-white text-xs font-semibold rounded-lg transition-colors shadow-sm active:scale-95"
                >
                  <svg class="size-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5">
                    <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
                  </svg>
                  <StableText tKey="addAccount">{t("addAccount")}</StableText>
                </button>
              </>
            )}
          </div>
        </div>
      </div>
    </header>
  );
}