"use client";

import { Clock3, Sparkles } from "lucide-react";
import type { DailyStarlanguageState } from "@/lib/home-types";
import type { RectificationEntrySummary } from "@/lib/rectification-entry";

/**
 * The empty state is split across two slots on purpose.
 *
 * `StarterGreeting` sits in the conversation area, bottom-aligned, so it lands
 * directly above the composer. `StarterEntries` sits inside `.composer-wrap`,
 * below the composer. The composer itself never moves: it keeps the one DOM
 * position it has in a live session, so nothing remounts when the first message
 * arrives and an in-flight draft, focus or queued card survives the transition.
 *
 * Before this, the empty state was a bordered hero card plus two 132px product
 * cards, and the composer sat under roughly 800px of content — the primary
 * action was the last thing on the page.
 */

export type StarterGreetingProps = {
  readonly starterGreeting: { readonly text: string };
};

/* One line. The salutation/question pair it replaces asked the user's question
   for them; the composer placeholder asks now. */
export function StarterGreeting({ starterGreeting }: StarterGreetingProps) {
  return (
    <section className="starter-greeting-block" aria-labelledby="starter-heading">
      <h1 id="starter-heading">{starterGreeting.text}</h1>
    </section>
  );
}

export type StarterEntriesProps = {
  readonly dailyStarlanguage: DailyStarlanguageState;
  readonly natalMinuteAvailable: boolean;
  readonly dailyStarlanguageQuestion: string;
  readonly dailyStarlanguageTrend: string;
  readonly productEntrypointsDisabled: boolean;
  readonly startDailyStarlanguageConsultation: () => void;
  readonly rectificationCardLabel: string;
  readonly rectificationCardAction: string;
  readonly rectificationLoading: boolean;
  readonly rectificationMutationPending: boolean;
  readonly openRectificationFromHomepage: () => void;
  readonly rectificationEntrySummary: RectificationEntrySummary | null;
  readonly rectificationError: string;
  readonly rectificationSurfaceOpen: boolean;
  readonly rectificationErrorMessage: string;
};

export function StarterEntries({
  natalMinuteAvailable,
  dailyStarlanguage,
  dailyStarlanguageQuestion,
  dailyStarlanguageTrend,
  productEntrypointsDisabled,
  startDailyStarlanguageConsultation,
  rectificationCardLabel,
  rectificationCardAction,
  rectificationLoading,
  rectificationMutationPending,
  openRectificationFromHomepage,
  rectificationEntrySummary,
  rectificationError,
  rectificationSurfaceOpen,
  rectificationErrorMessage,
}: StarterEntriesProps) {
  const dailyLabel = natalMinuteAvailable ? "今日星语" : "每日运势";
  /* The trend line is the only part that arrives late. It stays a live region so
     a screen reader hears it settle, but it is a tooltip-rank hint now, not a
     card body — the pill is actionable from the first paint either way. */
  const dailyHint = natalMinuteAvailable ? dailyStarlanguageTrend : "看看今天的整体节奏";
  /* Three branches, same as the card it replaces: an unfinished case, a finished
     one that can be redone, and a first run. The label itself is server-driven
     from the entry summary (`rectificationCardAction`), not from the session list. */
  const rectificationHint = rectificationEntrySummary?.hasResumableCase
    ? "未完成的那次可以从左侧继续"
    : rectificationCardAction === "restart"
      ? "上次已经校正完，可以拿最新资料再来一次"
      : "不确定出生时间时，用记得住的经历一步步缩小范围";

  return (
    <div className="starter-entries">
      <div className="starter-entry-row">
        <button
          className="starter-entry"
          type="button"
          aria-label={natalMinuteAvailable ? dailyStarlanguageQuestion : "查看今日运势"}
          disabled={productEntrypointsDisabled}
          onClick={startDailyStarlanguageConsultation}
        >
          <Sparkles aria-hidden="true" />
          <span>{dailyLabel}</span>
        </button>
        <button
          className="starter-entry"
          type="button"
          aria-label={rectificationCardLabel}
          data-opening={rectificationLoading ? "true" : undefined}
          disabled={productEntrypointsDisabled || rectificationLoading || rectificationMutationPending}
          onClick={() => void openRectificationFromHomepage()}
        >
          <Clock3 aria-hidden="true" />
          <span>生时校正</span>
        </button>
      </div>
      <p
        className="starter-entry-hint"
        role={natalMinuteAvailable && dailyStarlanguage.kind !== "ready" ? "status" : undefined}
      >
        {dailyHint} · {rectificationHint}
      </p>
      {!natalMinuteAvailable && (
        <p className="starter-entry-boundary">出生时间不足以支持的判断我会说明，不会补造具体分钟。</p>
      )}
      {rectificationError && !rectificationSurfaceOpen && (
        <p className="form-error rectification-entry-error" role="alert">
          {rectificationErrorMessage}
        </p>
      )}
    </div>
  );
}