import React, { useState } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import type { Asset, NovelChapter } from '@/types';
import { mockAssets } from '@/mock/data';
import './NovelPreviewPage.css';

const NovelPreviewPage: React.FC = () => {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  const [activeChapter, setActiveChapter] = useState<string>('');
  const [rightTab, setRightTab] = useState<'worldview' | 'characters' | 'hooks'>('worldview');

  const novel: Asset | undefined = mockAssets.find(a => a.id === id && a.category === 'novel');
  const chapters = novel?.chapters || [];
  const meta = novel?.novelMeta;
  const currentChapter: NovelChapter | undefined = chapters.find(c => c.id === (activeChapter || chapters[0]?.id));

  if (!novel) {
    return (
      <div className="novel-preview-page">
        <div className="novel-preview-empty">
          <svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.2" strokeLinecap="round" strokeLinejoin="round" style={{ color: 'var(--color-text-disabled)' }}><circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12" y2="12"/><line x1="12" y1="16" x2="12.01" y2="16"/></svg>
          <p>未找到该小说</p>
          <button className="novel-back-btn" onClick={() => navigate('/assets')}>返回资产</button>
        </div>
      </div>
    );
  }

  return (
    <div className="novel-preview-page">
      {/* Top: Novel Intro */}
      <div className="novel-topbar">
        <button className="novel-back-btn" onClick={() => navigate('/assets')}>
          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><line x1="19" y1="12" x2="5" y2="12"/><polyline points="12 19 5 12 12 5"/></svg>
        </button>
        <div className="novel-intro">
          <h1 className="novel-intro-title">{novel.name}</h1>
          <p className="novel-intro-desc">{novel.description}</p>
          <div className="novel-intro-stats">
            <span>{chapters.length} 章</span>
            <span>·</span>
            <span>{chapters.reduce((s, c) => s + c.wordCount, 0).toLocaleString()} 字</span>
          </div>
        </div>
      </div>

      <div className="novel-body">
        {/* Left: Chapter List */}
        <aside className="novel-sidebar-left">
          <h3 className="novel-sidebar-title">章节目录</h3>
          <div className="novel-chapter-list">
            {chapters.map(ch => (
              <button
                key={ch.id}
                className={`novel-chapter-item ${(activeChapter || chapters[0]?.id) === ch.id ? 'active' : ''}`}
                onClick={() => setActiveChapter(ch.id)}
              >
                <span className="chapter-item-num">{String(ch.sortOrder).padStart(2, '0')}</span>
                <div className="chapter-item-info">
                  <span className="chapter-item-title">{ch.title}</span>
                  <span className="chapter-item-count">{ch.wordCount.toLocaleString()} 字</span>
                </div>
              </button>
            ))}
          </div>
        </aside>

        {/* Center: Content */}
        <main className="novel-content">
          {currentChapter ? (
            <>
              <div className="novel-content-header">
                <h2 className="novel-chapter-title">{currentChapter.title}</h2>
              </div>
              <div className="novel-content-body">
                {currentChapter.content.split('\n\n').map((para, i) => (
                  <p key={i} className="novel-paragraph">{para}</p>
                ))}
              </div>
              <div className="novel-content-footer">
                <span>本章字数：{currentChapter.wordCount.toLocaleString()} 字</span>
              </div>
            </>
          ) : (
            <div className="novel-content-empty">
              <p>暂无章节内容</p>
            </div>
          )}
        </main>

        {/* Right: World View, Characters, Hooks & Anchors */}
        <aside className="novel-sidebar-right">
          <div className="novel-right-tabs">
            <button
              className={`novel-right-tab ${rightTab === 'worldview' ? 'active' : ''}`}
              onClick={() => setRightTab('worldview')}
            >世界观</button>
            <button
              className={`novel-right-tab ${rightTab === 'characters' ? 'active' : ''}`}
              onClick={() => setRightTab('characters')}
            >人物</button>
            <button
              className={`novel-right-tab ${rightTab === 'hooks' ? 'active' : ''}`}
              onClick={() => setRightTab('hooks')}
            >钩子&锚点</button>
          </div>

          <div className="novel-right-content">
            {rightTab === 'worldview' && meta?.worldView && (
              <div className="novel-worldview">
                <p className="worldview-summary">{meta.worldView.summary}</p>
                <div className="worldview-section">
                  <h4>世界规则</h4>
                  <ul>
                    {meta.worldView.rules.map((r, i) => <li key={i}>{r}</li>)}
                  </ul>
                </div>
                <div className="worldview-section">
                  <h4>时间线</h4>
                  <div className="worldview-timeline">
                    {meta.worldView.timeline.map((t, i) => (
                      <div key={i} className="timeline-item">
                        <span className="timeline-era">{t.era}</span>
                        <span className="timeline-event">{t.events}</span>
                      </div>
                    ))}
                  </div>
                </div>
              </div>
            )}

            {rightTab === 'characters' && meta?.characters && (
              <div className="novel-characters">
                {meta.characters.map(char => (
                  <div key={char.id} className="character-card">
                    <div className="character-avatar">{char.name.charAt(0)}</div>
                    <div className="character-info">
                      <div className="character-name-row">
                        <span className="character-name">{char.name}</span>
                        <span className={`character-role ${char.role === '主角' ? 'main' : char.role === '反派' ? 'villain' : ''}`}>{char.role}</span>
                      </div>
                      <p className="character-desc">{char.description}</p>
                      {char.relationships.length > 0 && (
                        <div className="character-rels">
                          {char.relationships.map((r, i) => (
                            <span key={i} className="character-rel-tag">{r}</span>
                          ))}
                        </div>
                      )}
                    </div>
                  </div>
                ))}
              </div>
            )}

            {rightTab === 'hooks' && meta && (
              <div className="novel-hooks">
                <div className="hooks-section">
                  <h4>故事钩子</h4>
                  {meta.hooks.map((h, i) => (
                    <div key={i} className="hook-item">
                      <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M20.59 13.41l-7.17 7.17a2 2 0 01-2.83 0L2 12V2h10l8.59 8.59a2 2 0 010 2.82z"/><line x1="7" y1="7" x2="7.01" y2="7"/></svg>
                      <span>{h}</span>
                    </div>
                  ))}
                </div>
                <div className="hooks-section">
                  <h4>故事锚点</h4>
                  {meta.anchors.map((a, i) => (
                    <div key={i} className="anchor-item">
                      <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><circle cx="12" cy="12" r="10"/><circle cx="12" cy="12" r="3"/></svg>
                      <span>{a}</span>
                    </div>
                  ))}
                </div>
              </div>
            )}
          </div>
        </aside>
      </div>
    </div>
  );
};

export default NovelPreviewPage;