"use client";

import { useEffect, useRef, useState } from "react";
import { Check, MessageSquarePlus, RotateCcw, X } from "lucide-react";

import { ThinkingIndicator } from "@/components/ThinkingIndicator";
import { Button } from "@/components/ui/Button";
import { SectionHeader } from "@/components/ui/SectionHeader";
import { StatusNote } from "@/components/ui/StatusNote";
import { TextArea } from "@/components/ui/TextArea";
import { useRefine } from "@/lib/workbench/useRefine";

interface RefinePanelProps {
  projectId: string;
  chapterNo: number;
  // 选中原文；打开即对其回炉一次。
  original: string;
  // 接受回填：把选段替换为该产出（调用方按内容重锚落回草稿）。
  onAccept: (refined: string) => void;
  onClose: () => void;
}

// 润色 / 再沟通结果卡（内联，非模态）：打开即润色选段；作者可「再沟通」追加意见迭代出新版，
// 择版接受回填正文，或放弃。原文只读、生成不写库（不变量 #3），accept 才动草稿。
export function RefinePanel({
  projectId,
  chapterNo,
  original,
  onAccept,
  onClose,
}: RefinePanelProps) {
  const { status, versions, latest, refine, recommunicate } = useRefine();
  const [instruction, setInstruction] = useState("");
  const ranRef = useRef(false);

  // 打开即对选段回炉一次（仅一次，避免重复请求）。
  useEffect(() => {
    if (ranRef.current) return;
    ranRef.current = true;
    void refine(projectId, chapterNo, original);
  }, [projectId, chapterNo, original, refine]);

  const busy = status === "refining";

  const onRecommunicate = (): void => {
    const trimmed = instruction.trim();
    if (!trimmed || busy) return;
    setInstruction("");
    void recommunicate(projectId, chapterNo, trimmed);
  };

  return (
    <div className="border-b border-line bg-panel px-4 py-3 sm:px-6">
      <div className="flex items-center justify-between gap-3">
        <SectionHeader
          title="润色 / 再沟通"
          description="对选中段回炉；不满意可追加意见让 AI 再改一版，满意后接受回填。"
        />
        <Button onClick={onClose} variant="ghost" size="icon" aria-label="关闭润色">
          <X className="h-4 w-4" aria-hidden="true" />
        </Button>
      </div>

      <div className="mt-3 grid gap-3 sm:grid-cols-2">
        <figure className="rounded border border-line bg-bg p-3">
          <figcaption className="mb-1 text-2xs text-ink-soft">原文</figcaption>
          <p className="whitespace-pre-wrap text-sm text-ink-soft">{original}</p>
        </figure>
        <figure className="rounded border border-cinnabar/40 bg-bg p-3">
          <figcaption className="mb-1 flex items-center gap-2 text-2xs text-ink-soft">
            改写
            {versions.length > 0 ? (
              <span className="rounded bg-panel px-1.5 py-0.5 tabular-nums">
                第 {versions.length} 版
              </span>
            ) : null}
          </figcaption>
          {busy && !latest ? (
            <ThinkingIndicator label="润色中" className="text-xs text-cinnabar" />
          ) : latest ? (
            <p className="whitespace-pre-wrap text-sm text-ink">{latest.refined}</p>
          ) : status === "error" ? (
            <StatusNote variant="danger" className="text-xs" title="回炉失败">
              <button
                type="button"
                onClick={() => void refine(projectId, chapterNo, original)}
                className="mt-1 inline-flex items-center gap-1 text-cinnabar hover:underline"
              >
                <RotateCcw className="h-3.5 w-3.5" aria-hidden="true" />
                重试
              </button>
            </StatusNote>
          ) : null}
        </figure>
      </div>

      <div className="mt-3 space-y-2">
        <label className="block">
          <span className="sr-only">再沟通意见</span>
          <TextArea
            value={instruction}
            onChange={(e) => setInstruction(e.target.value)}
            rows={2}
            placeholder="再沟通：想怎么改？（如「再收紧节奏」「保留这句比喻」）"
          />
        </label>
        <div className="flex flex-wrap items-center gap-2">
          <Button
            onClick={onRecommunicate}
            disabled={busy || instruction.trim().length === 0}
            variant="secondary"
            size="sm"
          >
            <MessageSquarePlus className="h-4 w-4" aria-hidden="true" />
            再改一版
          </Button>
          <Button
            onClick={() => latest && onAccept(latest.refined)}
            disabled={busy || !latest}
            variant="primary"
            size="sm"
          >
            <Check className="h-4 w-4" aria-hidden="true" />
            接受回填
          </Button>
          {busy ? (
            <ThinkingIndicator label="生成中" className="text-xs text-cinnabar" />
          ) : null}
        </div>
      </div>
    </div>
  );
}
