/**
 * 内容解析器
 * XML 标签转 AST，支持 qa_box, script_box, warn_box, tip_box, table
 */

import { Paragraph, Table } from 'docx';
import {
  qaBox,
  scriptBox,
  warnBox,
  tipBox,
  professionalTable,
  h1,
  h2,
  h3,
  p,
  bullet,
  blank,
  divider,
  pageBreak,
  generateCover
} from './docx-builder';

export type ContentNodeType =
  | 'paragraph'
  | 'heading'
  | 'qa_box'
  | 'script_box'
  | 'warn_box'
  | 'tip_box'
  | 'table'
  | 'bullet'
  | 'divider'
  | 'page_break'
  | 'cover';

export interface ContentNode {
  type: ContentNodeType;
  content: string | Record<string, any>;
  level?: number;
  children?: ContentNode[];
}

/**
 * 将 LLM 输出的未处理自定义标签转换为 Markdown 等效格式
 * 这些标签在 prompt 中定义，但 content-parser 不直接支持
 */
function normalizeCustomTags(markdown: string): string {
  // 高管摘要 → 加粗段落
  markdown = markdown.replace(/<exec_summary>\n?([\s\S]+?)\n?<\/exec_summary>/g,
    (_, content) => `**【高管摘要】**\n${content.trim()}\n`);

  // 核心数据网格 → 加粗段落
  markdown = markdown.replace(/<metric_grid>([\s\S]+?)<\/metric_grid>/g,
    (_, content) => `**【核心数据】** ${content.trim()}\n`);

  // 愿景引言 → 加粗段落
  markdown = markdown.replace(/<vision_quote>\n?([\s\S]+?)\n?<\/vision_quote>/g,
    (_, content) => `> ${content.trim()}\n`);

  // 高亮框 → 标题 + 段落
  markdown = markdown.replace(/<highlight_box\s*(?:title="([^"]*)")?\s*>\n?([\s\S]+?)\n?<\/highlight_box>/g,
    (_, title, content) => `### ${title || '核心洞察'}\n${content.trim()}\n`);

  // 步骤框 → 编号列表
  markdown = markdown.replace(/<step_box>\n?([\s\S]+?)\n?<\/step_box>/g,
    (_, content) => {
      const lines = content.trim().split('\n').filter((l: string) => l.trim());
      return lines.map((l: string, i: number) => {
        const text = l.replace(/^\d+\.\s*/, '').trim();
        return `${i + 1}. ${text}`;
      }).join('\n') + '\n';
    });

  // 对比框 → 表格格式
  markdown = markdown.replace(/<comparison_box\s+left_title="([^"]*)"\s+right_title="([^"]*)">\n?([\s\S]+?)\n?<\/comparison_box>/g,
    (_, leftTitle, rightTitle, content) => {
      const lines = content.trim().split('\n').filter((l: string) => l.trim());
      const header = `| ${leftTitle} | ${rightTitle} |\n| --- | --- |`;
      const rows = lines.map((l: string) => {
        const parts = l.split('|').map((p: string) => p.trim());
        return `| ${parts[0] || ''} | ${parts[1] || ''} |`;
      }).join('\n');
      return `${header}\n${rows}\n`;
    });

  // 检查清单 → 编号列表
  markdown = markdown.replace(/<checklist\s*(?:title="([^"]*)")?\s*>\n?([\s\S]+?)\n?<\/checklist>/g,
    (_, title, content) => {
      const lines = content.trim().split('\n').filter((l: string) => l.trim());
      const header = title ? `### ${title}\n` : '';
      return header + lines.map((l: string) => `- ${l.replace(/^\[[ x]\]\s*/, '').trim()}`).join('\n') + '\n';
    });

  // 引用 → 加粗段落
  markdown = markdown.replace(/<citation>([\s\S]+?)<\/citation>/g,
    (_, content) => `> ${content.trim()}\n`);

  // 数字卡片 → 加粗段落
  markdown = markdown.replace(/<number_card\s+label="([^"]*)"\s+value="([^"]*)"(?:\s+note="([^"]*)")?\s*\/?>/g,
    (_, label, value, note) => `**${label}：${value}**${note ? `（${note}）` : ''}\n`);

  // 信息框 → 段落
  markdown = markdown.replace(/<info_box\s*(?:title="([^"]*)")?\s*>\n?([\s\S]+?)\n?<\/info_box>/g,
    (_, title, content) => `${title ? `**${title}**\n` : ''}${content.trim()}\n`);

  // KPI 行 → 加粗段落
  markdown = markdown.replace(/<kpi_row>\n?([\s\S]+?)\n?<\/kpi_row>/g,
    (_, content) => `**【关键指标】**\n${content.trim()}\n`);

  // 进度条 → 段落
  markdown = markdown.replace(/<phase_bar\s*(?:label="([^"]*)")?\s*>\n?([\s\S]+?)\n?<\/phase_bar>/g,
    (_, label, content) => `${label ? `**${label}**\n` : ''}${content.trim()}\n`);

  return markdown;
}

/**
 * 解析 Markdown + XML 标签内容
 */
export function parseContent(markdown: string): ContentNode[] {
  // ★ 预处理：将未支持的自定义标签转换为 Markdown 等效格式
  markdown = normalizeCustomTags(markdown);

  const nodes: ContentNode[] = [];
  let remaining = markdown;

  // 定义标签匹配模式
  const patterns: Record<string, RegExp> = {
    qa_box: /<qa_box\s+question="([^"]+)"[^>]*>\n([\s\S]+?)\n<\/qa_box>/g,
    script_box: /<script_box\s+scene="([^"]+)"[^>]*>\n([\s\S]+?)\n<\/script_box>/g,
    warn_box: /<warn_box[^>]*>\n([\s\S]+?)\n<\/warn_box>/g,
    tip_box: /<tip_box\s+title="([^"]+)"[^>]*>\n([\s\S]+?)\n<\/tip_box>/g,
    table: /<table\s+headers="([^"]+)"[^>]*>\n([\s\S]+?)\n<\/table>/g
  };

  // 提取所有标签位置
  const tagPositions: Array<{ start: number; end: number; node: ContentNode }> = [];

  // 解析 qa_box
  let match;
  while ((match = patterns.qa_box.exec(markdown)) !== null) {
    tagPositions.push({
      start: match.index,
      end: match.index + match[0].length,
      node: {
        type: 'qa_box',
        content: {
          question: match[1],
          answers: match[2].split('\n').filter(l => l.trim())
        }
      }
    });
  }

  // 解析 script_box
  patterns.script_box.lastIndex = 0;
  while ((match = patterns.script_box.exec(markdown)) !== null) {
    tagPositions.push({
      start: match.index,
      end: match.index + match[0].length,
      node: {
        type: 'script_box',
        content: {
          scene: match[1],
          lines: match[2].split('\n').filter(l => l.trim())
        }
      }
    });
  }

  // 解析 warn_box
  patterns.warn_box.lastIndex = 0;
  while ((match = patterns.warn_box.exec(markdown)) !== null) {
    tagPositions.push({
      start: match.index,
      end: match.index + match[0].length,
      node: {
        type: 'warn_box',
        content: {
          lines: match[1].split('\n').filter(l => l.trim())
        }
      }
    });
  }

  // 解析 tip_box
  patterns.tip_box.lastIndex = 0;
  while ((match = patterns.tip_box.exec(markdown)) !== null) {
    tagPositions.push({
      start: match.index,
      end: match.index + match[0].length,
      node: {
        type: 'tip_box',
        content: {
          title: match[1],
          lines: match[2].split('\n').filter(l => l.trim())
        }
      }
    });
  }

  // 解析 table
  patterns.table.lastIndex = 0;
  while ((match = patterns.table.exec(markdown)) !== null) {
    const headers = match[1].split(',').map(h => h.trim());
    const rows = match[2]
      .split('\n')
      .filter(l => l.trim())
      .map(row => row.split('|').map(cell => cell.trim()));

    tagPositions.push({
      start: match.index,
      end: match.index + match[0].length,
      node: {
        type: 'table',
        content: { headers, rows, colWidths: calculateColWidths(headers, rows) }
      }
    });
  }

  // 按位置排序
  tagPositions.sort((a, b) => a.start - b.start);

  // 解析普通 Markdown 文本（非标签部分）
  let lastEnd = 0;
  for (const pos of tagPositions) {
    // 处理标签之前的文本
    if (pos.start > lastEnd) {
      const textBetween = markdown.slice(lastEnd, pos.start);
      const textNodes = parseMarkdownText(textBetween);
      nodes.push(...textNodes);
    }

    // 添加标签节点
    nodes.push(pos.node);
    lastEnd = pos.end;
  }

  // 处理剩余文本
  if (lastEnd < markdown.length) {
    const remainingText = markdown.slice(lastEnd);
    const textNodes = parseMarkdownText(remainingText);
    nodes.push(...textNodes);
  }

  return nodes;
}

/**
 * 解析普通 Markdown 文本
 */
function parseMarkdownText(text: string): ContentNode[] {
  const nodes: ContentNode[] = [];
  const lines = text.split('\n');

  for (const line of lines) {
    const trimmed = line.trim();

    if (!trimmed) {
      // 空行
      nodes.push({ type: 'paragraph', content: '' });
      continue;
    }

    // 标题
    if (trimmed.startsWith('# ')) {
      nodes.push({ type: 'heading', content: trimmed.slice(2), level: 1 });
    } else if (trimmed.startsWith('## ')) {
      nodes.push({ type: 'heading', content: trimmed.slice(3), level: 2 });
    } else if (trimmed.startsWith('### ')) {
      nodes.push({ type: 'heading', content: trimmed.slice(4), level: 3 });
    }
    // 列表
    else if (trimmed.startsWith('- ') || trimmed.startsWith('* ')) {
      nodes.push({ type: 'bullet', content: trimmed.slice(2), level: 0 });
    } else if (trimmed.match(/^\d+\./)) {
      nodes.push({ type: 'bullet', content: trimmed.replace(/^\d+\.\s*/, ''), level: 0 });
    }
    // 分隔线
    else if (trimmed === '---' || trimmed === '***') {
      nodes.push({ type: 'divider', content: '' });
    }
    // 分页
    else if (trimmed === '<<<PAGE_BREAK>>>') {
      nodes.push({ type: 'page_break', content: '' });
    }
    // 普通段落
    else {
      nodes.push({ type: 'paragraph', content: trimmed });
    }
  }

  return nodes;
}

/**
 * 计算表格列宽
 */
function calculateColWidths(headers: string[], rows: string[][]): number[] {
  const colCount = headers.length;
  const defaultWidth = 9000 / colCount;

  // 根据内容长度调整宽度
  const maxWidths = headers.map((h, i) => {
    const headerLen = h.length;
    const maxRowLen = Math.max(...rows.map(r => (r[i] || '').length));
    return Math.max(headerLen, maxRowLen);
  });

  // 按比例分配宽度
  const totalMax = maxWidths.reduce((a, b) => a + b, 0);
  return maxWidths.map(w => Math.round((w / totalMax) * 9000));
}

/**
 * 将 AST 转换为 Docx 元素
 */
export function buildDocxElements(
  nodes: ContentNode[],
  options?: { title?: string; version?: string; confidentiality?: string }
): (Paragraph | Table)[] {
  const elements: (Paragraph | Table)[] = [];

  // 添加封面
  if (options?.title) {
    elements.push(...generateCover(
      options.title,
      options.version || 'v1.0',
      options.confidentiality || '内部机密，禁止外传'
    ));
  }

  for (const node of nodes) {
    switch (node.type) {
      case 'heading':
        if (node.level === 1) {
          elements.push(h1(node.content as string));
        } else if (node.level === 2) {
          elements.push(h2(node.content as string));
        } else {
          elements.push(h3(node.content as string));
        }
        break;

      case 'paragraph':
        if ((node.content as string).trim()) {
          elements.push(p(node.content as string));
        } else {
          elements.push(blank());
        }
        break;

      case 'bullet':
        elements.push(bullet(node.content as string, node.level || 0));
        break;

      case 'qa_box':
        const qaData = node.content as { question: string; answers: string[] };
        elements.push(qaBox(qaData.question, qaData.answers));
        break;

      case 'script_box':
        const scriptData = node.content as { scene: string; lines: string[] };
        elements.push(scriptBox(scriptData.scene, scriptData.lines));
        break;

      case 'warn_box':
        const warnData = node.content as { lines: string[] };
        elements.push(warnBox(warnData.lines));
        break;

      case 'tip_box':
        const tipData = node.content as { title: string; lines: string[] };
        elements.push(tipBox(tipData.title, tipData.lines));
        break;

      case 'table':
        const tableData = node.content as {
          headers: string[];
          rows: string[][];
          colWidths: number[];
        };
        elements.push(professionalTable(tableData.headers, tableData.rows, tableData.colWidths));
        break;

      case 'divider':
        elements.push(divider());
        break;

      case 'page_break':
        elements.push(pageBreak());
        break;
    }
  }

  return elements;
}

/**
 * 完整解析流程：Markdown → AST → Docx Elements → Buffer
 */
export async function markdownToDocx(
  markdown: string,
  options?: {
    title?: string;
    version?: string;
    confidentiality?: string;
  }
): Promise<Buffer> {
  const nodes = parseContent(markdown);
  const elements = buildDocxElements(nodes, options);

  // 导入生成函数
  const { generateDocxBuffer } = await import('./docx-builder');
  return generateDocxBuffer(elements);
}

/**
 * 快速统计内容组件数量
 */
export function countContentComponents(markdown: string): Record<string, number> {
  return {
    qaBox: (markdown.match(/<qa_box/g) || []).length,
    scriptBox: (markdown.match(/<script_box/g) || []).length,
    warnBox: (markdown.match(/<warn_box/g) || []).length,
    tipBox: (markdown.match(/<tip_box/g) || []).length,
    table: (markdown.match(/<table/g) || []).length,
    heading: (markdown.match(/^#{1,3}\s/gm) || []).length,
    bullet: (markdown.match(/^[-*]\s/gm) || []).length
  };
}