import { useEffect, useState } from 'react';

interface Props {
  rawKey: string;
  team: string;
  reason: 'created' | 'rotated';
  onClose: () => void;
}

/**
 * One-time raw bearer reveal. The DB never stores the raw value — once
 * this dialog closes the operator can never see it again, so we:
 *  - require an explicit "I've saved it" acknowledgement before close
 *  - show a copy-to-clipboard button as the obvious primary action
 *  - warn loudly in red
 *  - trap ESC, browser back, and tab-close (beforeunload) until
 *    acknowledged so a stray keypress can't lose the key (F10)
 *
 * The dialog is intentionally modal (overlay + focus trap via tabindex).
 */
export function GatewayKeyRawKeyDialog({ rawKey, team, reason, onClose }: Props) {
  const [copied, setCopied] = useState(false);
  const [acknowledged, setAcknowledged] = useState(false);

  // F10: while the raw key is on-screen and not acknowledged, block the
  // common dismissal paths that would otherwise silently lose it:
  //  - ESC keypress (Escape closes most modals by convention)
  //  - browser back / forward (popstate)
  //  - tab close / refresh (beforeunload — best-effort browser warning)
  // We intentionally do NOT block the dialog's own Close button (gated
  // by the `acknowledged` checkbox) or the overlay click (which the
  // current design already ignores).
  useEffect(() => {
    if (acknowledged) return;

    const onKeydown = (e: KeyboardEvent): void => {
      if (e.key === 'Escape') {
        e.preventDefault();
        e.stopPropagation();
      }
    };
    document.addEventListener('keydown', onKeydown, { capture: true });

    const onBeforeUnload = (e: BeforeUnloadEvent): string => {
      e.preventDefault();
      const msg = 'Gateway API key has not been saved. Closing this page will lose it forever.';
      // Modern browsers ignore the returned string but require it set
      // for the warning dialog to appear. Setting both for cross-browser
      // safety (Chrome reads returnValue, some older Firefox reads return).
      (e as BeforeUnloadEvent & { returnValue: string }).returnValue = msg;
      return msg;
    };
    window.addEventListener('beforeunload', onBeforeUnload);

    // Push a sentinel history entry so the next back-button press lands
    // here (where we re-push it). Best-effort: doesn't fully prevent
    // navigation in every browser, but turns a single back-tap into a
    // visible alert + re-block.
    let pushed = false;
    try {
      window.history.pushState({ aaoGatewayKeyTrap: true }, '', window.location.href);
      pushed = true;
    } catch { /* SSR / sandboxed iframes: skip */ }
    const onPopState = (e: PopStateEvent): void => {
      e.preventDefault?.();
      try {
        window.history.pushState({ aaoGatewayKeyTrap: true }, '', window.location.href);
      } catch { /* ignore */ }
      alert(
        'API key has not been saved. Copy it and tick "保存しました" before navigating away.',
      );
    };
    window.addEventListener('popstate', onPopState);

    return () => {
      document.removeEventListener('keydown', onKeydown, { capture: true });
      window.removeEventListener('beforeunload', onBeforeUnload);
      window.removeEventListener('popstate', onPopState);
      // Drop the sentinel we pushed so the user's history isn't littered.
      if (pushed) {
        try {
          if (window.history.state && (window.history.state as { aaoGatewayKeyTrap?: boolean }).aaoGatewayKeyTrap) {
            window.history.back();
          }
        } catch { /* ignore */ }
      }
    };
  }, [acknowledged]);

  async function handleCopy() {
    try {
      await navigator.clipboard.writeText(rawKey);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {
      // Some browsers / contexts block clipboard access. The textarea
      // is selectable as a fallback.
    }
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40">
      <div className="bg-white rounded-lg shadow-xl max-w-lg w-full mx-4 p-6">
        <h3 className="text-lg font-semibold text-slate-800 mb-1">
          {reason === 'created' ? '新しい Gateway Key を発行しました' : 'Gateway Key をローテーションしました'}
        </h3>
        <p className="text-xs text-slate-500 mb-4">team: {team}</p>

        <div className="rounded border border-red-300 bg-red-50 p-3 mb-3">
          <p className="text-sm text-red-800 font-medium">⚠️ このキーは今後二度と表示されません</p>
          <p className="text-xs text-red-700 mt-1">
            必ずパスワードマネージャや LLM クライアントの設定にコピー・保存してから閉じてください。
            紛失した場合は Rotate で再発行する必要があります。
          </p>
        </div>

        <label className="block text-xs font-medium text-slate-600 mb-1">Bearer Key (sk-aao-…)</label>
        <textarea
          readOnly
          value={rawKey}
          rows={2}
          className="w-full font-mono text-xs px-2 py-1.5 border border-slate-300 rounded bg-slate-50 select-all"
          onFocus={(e) => e.target.select()}
        />

        <div className="flex gap-2 mt-3">
          <button
            type="button"
            onClick={handleCopy}
            className="px-3 py-1.5 text-sm rounded bg-accent text-white hover:bg-accent-strong"
          >
            {copied ? '✓ Copied' : 'Copy to clipboard'}
          </button>
        </div>

        <div className="border-t border-hairline mt-4 pt-4">
          <label className="flex items-start gap-2 text-sm cursor-pointer">
            <input
              type="checkbox"
              checked={acknowledged}
              onChange={(e) => setAcknowledged(e.target.checked)}
              className="mt-0.5"
            />
            <span className="text-slate-700">
              キーを安全に保存しました。今後このキーは表示できなくなることを理解しています。
            </span>
          </label>

          <div className="flex justify-end gap-2 mt-4">
            <button
              type="button"
              disabled={!acknowledged}
              onClick={onClose}
              className="px-3 py-1.5 text-sm rounded border border-slate-300 disabled:opacity-40 disabled:cursor-not-allowed hover:bg-slate-50"
            >
              Close
            </button>
          </div>
        </div>
      </div>
    </div>
  );
}