"use client";

import Link from "next/link";
import { ArrowRight, CheckCircle2, ListTree } from "lucide-react";

import { Button } from "@/components/ui/Button";
import { StatusNote } from "@/components/ui/StatusNote";
import type { AcceptResponse } from "@/lib/api/types";
import { buildAcceptPreview } from "@/lib/review/accept-preview";
import { ThinkingIndicator } from "@/components/ThinkingIndicator";
import { buttonClass } from "@/lib/ui/variants";

interface AcceptPanelProps {
  projectId: string;
  chapterNo: number;
  // 本页是否已有审稿结果（进页带留痕 或 本次重审完成）。用于区分
  // 「审过且 0 冲突→可直接验收」与「未审稿→先审稿」，避免把"未知"当"无冲突"。
  reviewed: boolean;
  conflictCount: number;
  unresolvedCount: number;
  // R3：当前伏笔建议数（验收前清单提醒，只读不自动落库）。
  foreshadowCount: number;
  accepting: boolean;
  result: AcceptResponse | null;
  onAccept: () => void;
}

// 验收 gate（UX §9 / §8.4）：未决禁验收（置灰 + 文案），验收后呈现「本次将更新」清单。
export function AcceptPanel({
  projectId,
  chapterNo,
  reviewed,
  conflictCount,
  unresolvedCount,
  foreshadowCount,
  accepting,
  result,
  onAccept,
}: AcceptPanelProps) {
  const blocked = unresolvedCount > 0;
  const preview = buildAcceptPreview({
    conflictCount,
    foreshadowSuggestions: foreshadowCount,
  });

  if (result) {
    return (
      <div className="rounded border border-pass/50 bg-panel p-4">
        <StatusNote variant="success" title="本章已验收">
          <p className="text-sm leading-6">
            终稿已晋升为正式版本，章节摘要和裁决留痕已按验收事务写回。
          </p>
        </StatusNote>
        <dl className="mt-3 grid grid-cols-3 gap-2 text-center">
          <div className="rounded border border-line bg-bg/60 p-2">
            <dt className="text-[11px] text-ink-soft">版次</dt>
            <dd className="mt-1 font-mono text-sm text-ink">
              v{result.accepted_version}
            </dd>
          </div>
          <div className="rounded border border-line bg-bg/60 p-2">
            <dt className="text-[11px] text-ink-soft">摘要</dt>
            <dd className="mt-1 text-sm text-ink">
              {result.digest_added ? "已新增" : "未变更"}
            </dd>
          </div>
          <div className="rounded border border-line bg-bg/60 p-2">
            <dt className="text-[11px] text-ink-soft">裁决</dt>
            <dd className="mt-1 font-mono text-sm text-ink">
              {result.decisions_recorded}
            </dd>
          </div>
        </dl>
        {result.review_id ? (
          <p className="mt-2 truncate text-[11px] text-ink-soft">
            留痕：<span className="font-mono">{result.review_id}</span>
          </p>
        ) : null}
        {/* 验收闭环 → 写下一章入口（修「验收后无路可走」的断点）。 */}
        <div className="mt-3 flex flex-wrap items-center gap-2">
          <Link
            href={`/projects/${projectId}/write?chapter=${chapterNo + 1}`}
            className={buttonClass({ variant: "primary" })}
          >
            <ArrowRight className="h-4 w-4" aria-hidden="true" />
            写第 {chapterNo + 1} 章
          </Link>
          <Link
            href={`/projects/${projectId}/outline`}
            className={buttonClass({ variant: "secondary" })}
          >
            <ListTree className="h-4 w-4" aria-hidden="true" />
            返回大纲
          </Link>
        </div>
      </div>
    );
  }

  return (
    <div
      className={`rounded border bg-panel p-4 ${
        blocked ? "border-conflict/35" : "border-line"
      }`}
    >
      {blocked ? (
        <StatusNote className="mb-3" variant="danger" role="status">
          尚有 {unresolvedCount} 项冲突未裁决，处理完才能验收。
        </StatusNote>
      ) : (
        <>
          <StatusNote className="mb-3" variant={reviewed ? "success" : "info"}>
            {conflictCount === 0
              ? reviewed
                ? "无冲突，可直接验收。"
                : "尚未审稿——建议先点「重新审稿」确认本章无冲突，再验收。"
              : "全部冲突已裁决，可验收本章。"}
          </StatusNote>
          {/* R3：验收前「本次将更新」清单（预期，落库口径以验收回执为准）。 */}
          <div className="mb-3 rounded border border-line/70 bg-bg/50 p-3">
            <h4 className="mb-1.5 text-xs font-semibold text-ink">
              本次验收将更新
            </h4>
            <ul className="space-y-1.5">
              {preview.map((item) => (
                <li key={item.label} className="flex gap-2 text-xs text-ink-soft">
                  <span className="text-cinnabar" aria-hidden="true">
                    ◆
                  </span>
                  <span>
                    <span className="text-ink">{item.label}</span>
                    <span className="text-ink-soft">：{item.detail}</span>
                  </span>
                </li>
              ))}
            </ul>
            <p className="mt-2 text-[11px] text-ink-soft/70">
              以上为预期，最终以验收回执为准。
            </p>
          </div>
        </>
      )}
      <Button
        onClick={onAccept}
        disabled={blocked || accepting}
        aria-disabled={blocked || accepting}
        variant="primary"
        className="w-full"
      >
        {accepting ? (
          <ThinkingIndicator label="验收中" className="justify-center" />
        ) : (
          <>
            <CheckCircle2 className="h-4 w-4" aria-hidden="true" />
            全部处理完，验收本章
          </>
        )}
      </Button>
    </div>
  );
}