import { useT } from "../../i18n";
import type { DraftOut, RemoteDraftOut } from "../../lib/types";

function timeLabel(iso: string): string {
  const d = new Date(iso);
  const now = new Date();
  if (d.toDateString() === now.toDateString())
    return d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
  return d.toLocaleDateString([], { month: "short", day: "numeric" });
}

function DraftRow({
  recipients,
  subject,
  preview,
  time,
  badge,
  onClick,
}: {
  recipients: string;
  subject: string;
  preview: string;
  time: string;
  badge?: string;
  onClick: () => void;
}) {
  return (
    <button
      onClick={onClick}
      className="flex w-full flex-col gap-1 border-b border-app-border px-6 py-2.5 text-left hover:bg-app-hover"
    >
      <div className="flex items-center gap-2">
        <span className="flex-1 truncate text-sm text-app-fg">{recipients}</span>
        {badge && (
          <span className="shrink-0 rounded bg-app-hover px-1.5 text-[10px] text-app-muted">
            {badge}
          </span>
        )}
        <span className="shrink-0 text-[11px] text-app-faint">{time}</span>
      </div>
      <div className="truncate text-[13px] font-medium text-app-fg">{subject}</div>
      {preview && <div className="truncate text-xs text-app-faint">{preview}</div>}
    </button>
  );
}

// The Drafts folder lists local drafts (the `drafts` table) plus drafts found in
// the account's IMAP Drafts folder that were created on another client.
export function DraftsList({
  drafts,
  remoteDrafts,
  onOpen,
  onOpenRemote,
}: {
  drafts: DraftOut[];
  remoteDrafts: RemoteDraftOut[];
  onOpen: (draft: DraftOut) => void;
  onOpenRemote: (draft: RemoteDraftOut) => void;
}) {
  const t = useT();
  if (drafts.length === 0 && remoteDrafts.length === 0) {
    return <div className="p-6 text-sm text-app-faint">{t("compose.noDrafts")}</div>;
  }

  // Merge local + remote drafts into one list sorted by date (newest first).
  type Row = {
    key: string;
    date: string;
    recipients: string;
    subject: string;
    preview: string;
    badge?: string;
    onClick: () => void;
  };
  const rows: Row[] = [
    ...drafts.map((d) => ({
      key: `l-${d.id}`,
      date: d.updated_at,
      recipients: d.payload.to.join(", ") || t("compose.noRecipient"),
      subject: d.payload.subject || t("compose.noSubject"),
      preview: d.payload.text.trim(),
      onClick: () => onOpen(d),
    })),
    ...remoteDrafts.map((d) => ({
      key: `r-${d.message_id}`,
      date: d.updated_at,
      recipients: d.to.join(", ") || t("compose.noRecipient"),
      subject: d.subject || t("compose.noSubject"),
      preview: d.snippet.trim(),
      badge: t("compose.otherClient"),
      onClick: () => onOpenRemote(d),
    })),
  ].sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime());

  return (
    <div className="h-full overflow-y-auto" data-testid="drafts-list">
      {rows.map((row) => (
        <DraftRow
          key={row.key}
          recipients={row.recipients}
          subject={row.subject}
          preview={row.preview}
          time={timeLabel(row.date)}
          badge={row.badge}
          onClick={row.onClick}
        />
      ))}
    </div>
  );
}