import { existsSync, readdirSync, readFileSync } from 'node:fs';
import path from 'node:path';

import type { ObsidianContextInput, ObsidianSyncInput, ObsidianValidateInput, ProjectAlias } from '../types.js';
import { projectAliases, projectLabels } from '../core/constants.js';
import { detectRepoType } from '../core/project.js';
import { resolveInsideRoot, resolveProject, toPosix, workspaceRoot } from '../core/workspace.js';

type FindingLevel = 'error' | 'info' | 'warning';

interface ObsidianFinding {
  check: string;
  level: FindingLevel;
  message: string;
  path?: string;
  target?: string;
}

interface CanvasNode {
  color?: string;
  file?: string;
  height?: number;
  id?: string;
  label?: string;
  text?: string;
  type?: string;
  width?: number;
  x?: number;
  y?: number;
}

interface CanvasEdge {
  fromNode?: string;
  id?: string;
  toNode?: string;
}

interface CanvasDocument {
  edges?: CanvasEdge[];
  nodes?: CanvasNode[];
}

interface ObsidianSettings {
  attachmentFolderPath?: string;
  userIgnoreFilters?: string[];
}

interface BookmarkItem {
  items?: BookmarkItem[];
  path?: string;
  title?: string;
  type?: string;
}

interface BookmarkSettings {
  items?: BookmarkItem[];
}

interface ObsidianContextDocument {
  excerpt?: string;
  links: string[];
  path: string;
  tags: string[];
  title: string;
}

interface CodeAnchorCatalogItem {
  alias: ProjectAlias;
  keyFiles: string[];
  keywords: string[];
  ruleFiles: string[];
  sourceRoots: string[];
}

interface CodeAnchorResult {
  alias: ProjectAlias;
  exists: boolean;
  inspectTool: {
    input: {
      includeGit: boolean;
      project: ProjectAlias;
    };
    name: 'kt_inspect_project';
  };
  keyFiles: Array<{
    exists: boolean;
    path: string;
  }>;
  label: string;
  projectPath: string;
  repoType: string;
  riskTool: {
    input: {
      changedFiles: string[];
      project: ProjectAlias;
    };
    name: 'kt_risk_scan';
  };
  score: number;
  ruleFiles: Array<{
    exists: boolean;
    path: string;
  }>;
  sourceRoots: Array<{
    exists: boolean;
    path: string;
  }>;
  verificationTool: {
    input: {
      changeType: 'general' | 'mcp';
      project: ProjectAlias;
    };
    name: 'kt_suggest_verification';
  };
}

const obsidianConfigFiles = [
  '.obsidian/app.json',
  '.obsidian/appearance.json',
  '.obsidian/bookmarks.json',
  '.obsidian/community-plugins.json',
  '.obsidian/core-plugins.json',
  '.obsidian/graph.json',
  '.obsidian/templates.json',
];

const expectedObsidianFiles = [
  'docs/obsidian/KT 知识图谱.md',
  'docs/obsidian/KT 项目关系.md',
  'docs/obsidian/KT 业务能力关系.md',
  'docs/obsidian/KT 发布运维关系.md',
  'docs/obsidian/KT 工作流关系.md',
  'docs/obsidian/KT Obsidian 工程化.md',
  'docs/obsidian/KT 工作流工程化.md',
  'docs/obsidian/KT 文档矩阵.md',
  'docs/obsidian/KT 文档矩阵.base',
  'docs/obsidian/KT 关系图谱.canvas',
  'docs/obsidian/modules/KT 模块索引.md',
  'docs/obsidian/modules/KT 模块 - Admin.md',
  'docs/obsidian/modules/KT 模块 - API Backend.md',
  'docs/obsidian/modules/KT 模块 - Blog Web.md',
  'docs/obsidian/modules/KT 模块 - CI CD NAS.md',
  'docs/obsidian/modules/KT 模块 - Data Observability.md',
  'docs/obsidian/modules/KT 模块 - KtTable.md',
  'docs/obsidian/modules/KT 模块 - Plugins.md',
  'docs/obsidian/modules/KT 模块 - Public Web Playground.md',
  'docs/obsidian/modules/KT 模块 - QQBot BangDream FFLogs.md',
  'docs/obsidian/modules/KT 模块 - Root Governance.md',
  'docs/obsidian/modules/KT 模块 - ktWorkflow Skills.md',
];

const requiredBookmarkPaths = [
  'AGENTS.md',
  'TASKS.md',
  'SKILLS.md',
  'docs/obsidian/KT 知识图谱.md',
  'docs/obsidian/modules/KT 模块索引.md',
  'docs/obsidian/KT 文档矩阵.md',
  'docs/obsidian/KT 关系图谱.canvas',
  'docs/obsidian/KT 文档矩阵.base',
  'docs/kt-testing-workflows.md',
];

const requiredCorePlugins = [
  'backlink',
  'bases',
  'bookmarks',
  'canvas',
  'command-palette',
  'global-search',
  'graph',
  'outgoing-link',
  'templates',
];

const expectedIgnoredRoots = [
  '.git/',
  '.kt-workspace/',
  'Node/',
  'Vue/',
  'Plugins/',
  'mcp/',
  'GitHub/',
  'Other/',
  'workspace-assets/',
];

const requiredBaseViewNames = [
  '开工路由',
  '模块-仓库矩阵',
  '工作流入口',
  '验证与收尾',
  '运行态与远程排查',
  '文档归口',
];

const requiredCanvasGroupLabels = [
  '00 当前上下文',
  '10 路由索引',
  '20 模块仓库',
  '30 工作流执行',
  '40 验证与固化',
];

const canvasTextNodeMaxChars = 180;

const defaultContextPaths = [
  'docs/obsidian/KT 知识图谱.md',
  'docs/obsidian/modules/KT 模块索引.md',
  'docs/obsidian/KT 文档矩阵.md',
  'docs/obsidian/KT 工作流关系.md',
];

const codeAnchorCatalog: CodeAnchorCatalogItem[] = [
  {
    alias: 'root',
    keyFiles: ['AGENTS.md', 'SKILLS.md', 'TASKS.md', 'docs/kt-workspace-structure.md', 'docs/kt-context-semantics.md'],
    keywords: ['root', 'governance', 'agents', 'skills', 'tasks', 'obsidian', '上下文', '根目录', '治理', '图谱'],
    ruleFiles: ['AGENTS.md', 'SKILLS.md', 'TASKS.md', 'docs/kt-context-semantics.md', 'docs/kt-workspace-structure.md'],
    sourceRoots: ['docs', 'skills', 'ci'],
  },
  {
    alias: 'mcp',
    keyFiles: ['mcp/ktWorkflow/README.md', 'mcp/ktWorkflow/src/server.ts', 'mcp/ktWorkflow/src/registerTools.ts', 'mcp/ktWorkflow/src/tools'],
    keywords: ['mcp', 'ktworkflow', 'workflow', 'skill', 'tools', '工作流', '校验', '上下文工具'],
    ruleFiles: ['AGENTS.md', 'SKILLS.md', 'TASKS.md', 'docs/kt-testing-workflows.md', 'mcp/ktWorkflow/README.md'],
    sourceRoots: ['mcp/ktWorkflow/src', 'mcp/ktWorkflow/scripts'],
  },
  {
    alias: 'api',
    keyFiles: ['Node/kt-template-online-api/README.md', 'Node/kt-template-online-api/API.md', 'Node/kt-template-online-api/src/qqbot', 'Node/kt-template-online-api/src/admin'],
    keywords: ['api', 'backend', 'nestjs', 'qqbot', 'bangdream', 'fflogs', 'napcat', 'systemlog', '后端', '接口', '日志'],
    ruleFiles: ['AGENTS.md', 'Node/kt-template-online-api/README.md', 'Node/kt-template-online-api/API.md', 'docs/kt-testing-workflows.md', 'docs/qqbot-nas-runtime.md'],
    sourceRoots: ['Node/kt-template-online-api/src', 'Node/kt-template-online-api/test'],
  },
  {
    alias: 'admin',
    keyFiles: ['Vue/kt-template-admin/README.md', 'Vue/kt-template-admin/skills/SKILL.md', 'Vue/kt-template-admin/apps/web-antdv-next/src'],
    keywords: ['admin', 'vben', 'kttable', 'profile', 'system', '后台', '表格', '个人中心', '系统管理'],
    ruleFiles: ['AGENTS.md', 'Vue/kt-template-admin/README.md', 'Vue/kt-template-admin/skills/SKILL.md', 'docs/kt-testing-workflows.md'],
    sourceRoots: ['Vue/kt-template-admin/apps/web-antdv-next/src'],
  },
  {
    alias: 'blog',
    keyFiles: ['Vue/kt-blog-web/README.md', 'Vue/kt-blog-web/src'],
    keywords: ['blog', 'argon', 'wordpress', '博客', '主题'],
    ruleFiles: ['AGENTS.md', 'Vue/kt-blog-web/README.md', 'skills/kt-component-specialist/SKILL.md', 'docs/kt-testing-workflows.md'],
    sourceRoots: ['Vue/kt-blog-web/src'],
  },
  {
    alias: 'web',
    keyFiles: ['Vue/kt-template-online-web/README.md', 'Vue/kt-template-online-web/src'],
    keywords: ['web', 'public', 'online', '前台', '展示'],
    ruleFiles: ['AGENTS.md', 'Vue/kt-template-online-web/README.md', 'docs/kt-testing-workflows.md'],
    sourceRoots: ['Vue/kt-template-online-web/src'],
  },
  {
    alias: 'playground',
    keyFiles: ['Vue/kt-template-online-playground/README.md', 'Vue/kt-template-online-playground/src'],
    keywords: ['playground', 'repl', 'component', '组件', '预览', '保存'],
    ruleFiles: ['AGENTS.md', 'Vue/kt-template-online-playground/README.md', 'docs/kt-testing-workflows.md'],
    sourceRoots: ['Vue/kt-template-online-playground/src'],
  },
  {
    alias: 'knife4j',
    keyFiles: ['Plugins/knife4j-swagger-vue3/README.md', 'Plugins/knife4j-swagger-vue3/src'],
    keywords: ['knife4j', 'swagger', 'openapi', '插件'],
    ruleFiles: ['AGENTS.md', 'Plugins/knife4j-swagger-vue3/AGENTS.md', 'Plugins/knife4j-swagger-vue3/README.md', 'docs/kt-testing-workflows.md'],
    sourceRoots: ['Plugins/knife4j-swagger-vue3/src'],
  },
  {
    alias: 'fnosK8s',
    keyFiles: ['Plugins/fnos-k8s-dashboard-fpk/README.md', 'Plugins/fnos-k8s-dashboard-fpk/AGENTS.md', 'Plugins/fnos-k8s-dashboard-fpk/apps/kt-k8s-dashboard'],
    keywords: ['fnos', 'k8s', 'kubernetes', 'fpk', 'nas', 'jenkins', 'caddy', '飞牛', '插件', '部署'],
    ruleFiles: ['AGENTS.md', 'Plugins/fnos-k8s-dashboard-fpk/AGENTS.md', 'Plugins/fnos-k8s-dashboard-fpk/README.md', 'docs/fnos-docker-jenkins-k8s-standard.md', 'docs/tencent-cloud-gateway-runtime.md'],
    sourceRoots: ['Plugins/fnos-k8s-dashboard-fpk/apps/kt-k8s-dashboard'],
  },
];

const staleReferencePatterns = [
  'docs/next-session-context-019e2f8f.md',
  'next-session-context-019e2f8f',
  'docs/fnos-docker-jenkins-k8s-technical-solution.md',
  'fnos-docker-jenkins-k8s-technical-solution',
  'yd.frp-bag.com',
  '45122',
];

const allowedStaleReferenceHints = [
  'Do not use stale historical',
  '不要使用旧入口',
  '旧 FRP',
  'historical FRP',
  '历史 FRP',
  '旧文档清理',
];

const ignoredDirectoryNames = new Set([
  '.cache',
  '.git',
  '.kt-workspace',
  '.next',
  '.pnpm',
  '.turbo',
  '.vite',
  'build',
  'coverage',
  'dist',
  'node_modules',
  'target',
]);

function normalizeInput(input: ObsidianValidateInput = {}): Required<ObsidianValidateInput> {
  return {
    checkLayout: input.checkLayout !== false,
    failOnWarnings: input.failOnWarnings === true,
    includeMarkdownLinks: input.includeMarkdownLinks !== false,
    includeStaleReferences: input.includeStaleReferences !== false,
  };
}

function readTextFile(relativePath: string): string {
  return readFileSync(resolveInsideRoot(relativePath), 'utf8');
}

/**
 * Resolves the Obsidian display title from frontmatter, the first H1, or the file name.
 * @param content - Markdown file content read from the KT vault.
 * @param fallback - Workspace-relative file path used when title metadata is absent.
 * @returns The title shown in Obsidian context output.
 */
function getMarkdownTitle(content: string, fallback: string): string {
  return (
    content.match(/^title:\s*(.+)$/m)?.[1]?.trim().replace(/^["']|["']$/g, '') ||
    content.match(/^#\s+(.+)$/m)?.[1]?.trim() ||
    path.basename(fallback, path.extname(fallback))
  );
}

/**
 * Extracts tags from the YAML frontmatter subset used by KT Obsidian notes.
 * @param content - Markdown content that may start with frontmatter.
 * @returns Tag values without additional normalization.
 */
function getMarkdownTags(content: string): string[] {
  const frontmatter = content.match(/^---\n([\s\S]*?)\n---/);
  if (!frontmatter) return [];

  const tagsBlock = frontmatter[1]?.match(/^tags:\n((?:\s+-\s+.+\n?)+)/m)?.[1] || '';
  return tagsBlock
    .split(/\r?\n/)
    .map((line) => line.match(/^\s+-\s+(.+)$/)?.[1]?.trim())
    .filter((tag): tag is string => Boolean(tag));
}

/**
 * Removes matching quote wrappers from a YAML-like scalar used by KT Obsidian metadata.
 * @param value - Raw scalar value from frontmatter or a Base view line.
 * @returns The unquoted scalar value.
 */
function stripYamlQuotes(value: string): string {
  return value.trim().replace(/^["']|["']$/g, '');
}

/**
 * Parses the small frontmatter subset that KT uses for Obsidian routing fields.
 * @param content - Markdown content with optional leading frontmatter.
 * @returns Frontmatter fields as scalar strings or string arrays.
 */
function parseFrontmatterFields(content: string): Map<string, string | string[]> {
  const frontmatter = content.match(/^---\n([\s\S]*?)\n---/);
  const fields = new Map<string, string | string[]>();
  if (!frontmatter?.[1]) return fields;

  const lines = frontmatter[1].split(/\r?\n/);
  let activeArrayKey: string | null = null;

  for (const line of lines) {
    const arrayItem = line.match(/^\s+-\s+(.+)$/);
    if (arrayItem?.[1] && activeArrayKey) {
      const current = fields.get(activeArrayKey);
      const values = Array.isArray(current) ? current : [];
      values.push(stripYamlQuotes(arrayItem[1]));
      fields.set(activeArrayKey, values);
      continue;
    }

    const keyValue = line.match(/^([A-Za-z0-9_-]+):(?:\s*(.*))?$/);
    if (!keyValue?.[1]) {
      activeArrayKey = null;
      continue;
    }

    const key = keyValue[1];
    const rawValue = keyValue[2]?.trim() || '';
    if (!rawValue) {
      fields.set(key, []);
      activeArrayKey = key;
      continue;
    }

    fields.set(key, stripYamlQuotes(rawValue));
    activeArrayKey = null;
  }

  return fields;
}

function extractWikiLinks(content: string): string[] {
  return [...content.matchAll(/\[\[([^\]\n]+)\]\]/g)]
    .map((match) => match[1]?.split('|')[0]?.split('#')[0]?.trim())
    .filter((value): value is string => Boolean(value));
}

function normalizeSearchValue(value: string): string {
  return value.trim().toLowerCase();
}

function buildExcerpt(content: string, terms: string[]): string {
  const body = content.replace(/^---\n[\s\S]*?\n---\n?/, '');
  const lines = body
    .split(/\r?\n/)
    .map((line) => line.trim())
    .filter((line) => line && !line.startsWith('---'));
  const matchedLine = lines.find((line) => {
    const loweredLine = normalizeSearchValue(line);
    return terms.some((term) => loweredLine.includes(term));
  });
  return (matchedLine || lines[0] || '').slice(0, 220);
}

function readContextDocument(relativePath: string, includeContent: boolean, terms: string[] = []): ObsidianContextDocument {
  const content = readTextFile(relativePath);
  const document: ObsidianContextDocument = {
    links: extractWikiLinks(content),
    path: relativePath,
    tags: getMarkdownTags(content),
    title: getMarkdownTitle(content, relativePath),
  };

  if (includeContent) {
    document.excerpt = buildExcerpt(content, terms);
  }

  return document;
}

function listObsidianMarkdownPaths(): string[] {
  return [
    ...listFiles(resolveInsideRoot('docs/obsidian'), new Set(['.md'])).map(relativeToWorkspace),
    'AGENTS.md',
    'SKILLS.md',
    'TASKS.md',
  ].filter((file) => existsSync(resolveInsideRoot(file)));
}

function scoreContextPath(relativePath: string, terms: string[]): number {
  if (terms.length === 0) return defaultContextPaths.includes(relativePath) ? 10 : 0;

  const content = readTextFile(relativePath);
  const haystack = normalizeSearchValue(`${relativePath}\n${content}`);
  return terms.reduce((score, term) => score + (haystack.includes(term) ? 1 : 0), 0);
}

function buildContextTerms(input: ObsidianContextInput): string[] {
  return [input.module, input.query]
    .filter((value): value is string => Boolean(value?.trim()))
    .flatMap((value) => value.split(/[,\s]+/))
    .map(normalizeSearchValue)
    .filter(Boolean);
}

/**
 * Extracts linked index targets from text nodes so Canvas can stay readable without file previews.
 * @param nodes - Parsed JSON Canvas nodes from the KT relationship graph.
 * @returns Text-node link summaries used by obsidian-context output.
 */
function extractCanvasIndexLinks(nodes: CanvasNode[]): Array<{ color?: string; id?: string; links: string[] }> {
  return nodes
    .filter((node) => node.type === 'text' && node.text)
    .map((node) => ({
      color: node.color,
      id: node.id,
      links: extractWikiLinks(node.text || ''),
    }))
    .filter((node) => node.links.length > 0);
}

/**
 * Reads a lightweight Canvas summary for context routing without embedding full note previews.
 * @param includeCanvas - Explicit false disables the Canvas summary for callers that need smaller output.
 * @returns Canvas node/edge counts plus indexed wikilink targets, or null when disabled/unreadable.
 */
function readCanvasSummary(includeCanvas: boolean | undefined): Record<string, unknown> | null {
  if (includeCanvas === false) return null;

  const canvas = readJsonFile<CanvasDocument>('docs/obsidian/KT 关系图谱.canvas', []);
  if (!canvas) return null;

  const nodes = Array.isArray(canvas.nodes) ? canvas.nodes : [];
  const fileNodes = nodes
    .filter((node) => node.type === 'file' && node.file)
    .map((node) => ({
      color: node.color,
      file: node.file,
      id: node.id,
    }));

  return {
    edges: Array.isArray(canvas.edges) ? canvas.edges.length : 0,
    fileNodes,
    indexLinks: extractCanvasIndexLinks(nodes),
    nodes: nodes.length,
  };
}

function scoreCodeAnchor(anchor: CodeAnchorCatalogItem, terms: string[]): number {
  if (terms.length === 0) return anchor.alias === 'root' || anchor.alias === 'mcp' ? 1 : 0;

  const haystack = normalizeSearchValue([
    anchor.alias,
    projectLabels[anchor.alias],
    ...anchor.keywords,
    ...anchor.keyFiles,
    ...anchor.sourceRoots,
  ].join('\n'));

  return terms.reduce((score, term) => score + (haystack.includes(term) ? 1 : 0), 0);
}

function buildFileAnchor(relativePath: string): { exists: boolean; path: string } {
  return {
    exists: existsSync(resolveInsideRoot(relativePath)),
    path: relativePath,
  };
}

function buildRuleAnchors(codeAnchors: CodeAnchorResult[]): Array<{ exists: boolean; path: string }> {
  const rulePaths = new Set([
    'AGENTS.md',
    'SKILLS.md',
    'TASKS.md',
    'docs/kt-testing-workflows.md',
    ...codeAnchors.flatMap((anchor) => anchor.ruleFiles.map((file) => file.path)),
  ]);

  return [...rulePaths].map(buildFileAnchor);
}

function buildCodeAnchors(terms: string[], maxAnchors = 5): CodeAnchorResult[] {
  return codeAnchorCatalog
    .map((anchor) => ({
      anchor,
      score: scoreCodeAnchor(anchor, terms),
    }))
    .filter((item) => item.score > 0)
    .sort((left, right) => {
      if (right.score !== left.score) return right.score - left.score;
      return left.anchor.alias.localeCompare(right.anchor.alias);
    })
    .slice(0, maxAnchors)
    .map(({ anchor, score }) => {
      const project = resolveProject(anchor.alias);
      return {
        alias: anchor.alias,
        exists: existsSync(project.path),
        inspectTool: {
          input: {
            includeGit: true,
            project: anchor.alias,
          },
          name: 'kt_inspect_project',
        },
        keyFiles: anchor.keyFiles.map((file) => ({
          exists: existsSync(resolveInsideRoot(file)),
          path: file,
        })),
        label: projectLabels[anchor.alias],
        projectPath: project.relativePath,
        repoType: existsSync(project.path) ? detectRepoType(project.path) : 'missing',
        riskTool: {
          input: {
            changedFiles: [],
            project: anchor.alias,
          },
          name: 'kt_risk_scan',
        },
        score,
        ruleFiles: anchor.ruleFiles.map(buildFileAnchor),
        sourceRoots: anchor.sourceRoots.map((file) => ({
          exists: existsSync(resolveInsideRoot(file)),
          path: file,
        })),
        verificationTool: {
          input: {
            changeType: anchor.alias === 'mcp' ? 'mcp' : 'general',
            project: anchor.alias,
          },
          name: 'kt_suggest_verification',
        },
      };
    });
}

function readJsonFile<T>(relativePath: string, findings: ObsidianFinding[]): T | null {
  if (!existsSync(resolveInsideRoot(relativePath))) {
    findings.push({
      check: 'json',
      level: 'error',
      message: '文件不存在。',
      path: relativePath,
    });
    return null;
  }

  try {
    return JSON.parse(readTextFile(relativePath)) as T;
  } catch (error) {
    findings.push({
      check: 'json',
      level: 'error',
      message: error instanceof Error ? error.message : 'JSON 解析失败。',
      path: relativePath,
    });
    return null;
  }
}

function listFiles(absoluteRoot: string, extensions: Set<string>, output: string[] = []): string[] {
  if (!existsSync(absoluteRoot)) return output;

  for (const entry of readdirSync(absoluteRoot, { withFileTypes: true })) {
    if (entry.isDirectory()) {
      if (!ignoredDirectoryNames.has(entry.name)) {
        listFiles(path.join(absoluteRoot, entry.name), extensions, output);
      }
      continue;
    }

    if (entry.isFile() && extensions.has(path.extname(entry.name).toLowerCase())) {
      output.push(path.join(absoluteRoot, entry.name));
    }
  }

  return output;
}

function relativeToWorkspace(filePath: string): string {
  return toPosix(path.relative(workspaceRoot, filePath));
}

function stripKnownExtension(value: string): string {
  return value.replace(/\.(base|canvas|md)$/i, '');
}

function buildFileIndex(): { basename: Map<string, string[]>; full: Set<string> } {
  const files = listFiles(workspaceRoot, new Set(['.base', '.canvas', '.md']));
  const full = new Set<string>();
  const basename = new Map<string, string[]>();

  for (const file of files) {
    const relativePath = relativeToWorkspace(file);
    const fullKey = stripKnownExtension(relativePath);
    const baseKey = stripKnownExtension(path.basename(relativePath));
    full.add(fullKey);
    full.add(relativePath);
    basename.set(baseKey, [...(basename.get(baseKey) || []), relativePath]);
  }

  return { basename, full };
}

function isWikiLinkResolved(target: string, fileIndex: ReturnType<typeof buildFileIndex>): boolean {
  const normalizedTarget = stripKnownExtension(target.replaceAll('\\', '/'));
  if (fileIndex.full.has(normalizedTarget) || fileIndex.full.has(target)) return true;

  if (normalizedTarget.includes('/')) return false;

  return (fileIndex.basename.get(normalizedTarget) || []).length === 1;
}

function getObsidianMarkdownFiles(): string[] {
  return [
    ...listFiles(resolveInsideRoot('docs/obsidian'), new Set(['.md'])),
    ...listFiles(resolveInsideRoot('.obsidian/templates'), new Set(['.md'])),
  ];
}

function validateWikiLinks(findings: ObsidianFinding[]): number {
  const fileIndex = buildFileIndex();
  let linkCount = 0;

  for (const absolutePath of getObsidianMarkdownFiles()) {
    const relativePath = relativeToWorkspace(absolutePath);
    const content = readFileSync(absolutePath, 'utf8');
    const matches = content.matchAll(/\[\[([^\]\n]+)\]\]/g);

    for (const match of matches) {
      linkCount += 1;
      const rawTarget = match[1]?.split('|')[0]?.split('#')[0]?.trim() || '';
      if (!rawTarget) continue;

      if (!isWikiLinkResolved(rawTarget, fileIndex)) {
        findings.push({
          check: 'wikilink',
          level: 'error',
          message: '内部链接无法解析到工作区文件。',
          path: relativePath,
          target: rawTarget,
        });
      }
    }
  }

  return linkCount;
}

function isExternalMarkdownTarget(target: string): boolean {
  return /^(https?:|mailto:|data:|obsidian:)/i.test(target);
}

function decodeLinkTarget(target: string): string {
  try {
    return decodeURIComponent(target);
  } catch {
    return target;
  }
}

function validateMarkdownLinks(findings: ObsidianFinding[]): number {
  let linkCount = 0;

  for (const absolutePath of getObsidianMarkdownFiles()) {
    const relativePath = relativeToWorkspace(absolutePath);
    const content = readFileSync(absolutePath, 'utf8');
    const matches = content.matchAll(/!?\[[^\]\n]*\]\(([^)\n]+)\)/g);

    for (const match of matches) {
      const rawTarget = match[1]?.trim().replace(/^<|>$/g, '') || '';
      const targetWithoutAnchor = decodeLinkTarget(rawTarget.split('#')[0]?.trim() || '');
      if (!targetWithoutAnchor || targetWithoutAnchor.startsWith('#') || isExternalMarkdownTarget(targetWithoutAnchor)) {
        continue;
      }

      linkCount += 1;
      const absoluteTarget = path.resolve(path.dirname(absolutePath), targetWithoutAnchor);
      const relativeTarget = path.relative(workspaceRoot, absoluteTarget);

      if (relativeTarget.startsWith('..') || path.isAbsolute(relativeTarget)) {
        findings.push({
          check: 'markdown-link',
          level: 'error',
          message: 'Markdown 相对链接指向工作区外。',
          path: relativePath,
          target: rawTarget,
        });
        continue;
      }

      if (!existsSync(absoluteTarget)) {
        findings.push({
          check: 'markdown-link',
          level: 'error',
          message: 'Markdown 相对链接目标不存在。',
          path: relativePath,
          target: rawTarget,
        });
      }
    }
  }

  return linkCount;
}

function hasNumber(value: unknown): value is number {
  return typeof value === 'number' && Number.isFinite(value);
}

function rectanglesOverlap(a: CanvasNode, b: CanvasNode): boolean {
  if (!hasNumber(a.x) || !hasNumber(a.y) || !hasNumber(a.width) || !hasNumber(a.height)) return false;
  if (!hasNumber(b.x) || !hasNumber(b.y) || !hasNumber(b.width) || !hasNumber(b.height)) return false;

  return (
    a.x < b.x + b.width &&
    a.x + a.width > b.x &&
    a.y < b.y + b.height &&
    a.y + a.height > b.y
  );
}

/**
 * Validates JSON Canvas IDs, file targets, edge references, lane groups, and optional visual overlap.
 * @param findings - Shared finding accumulator for the current Obsidian validation run.
 * @param checkLayout - Whether non-group node overlap should be reported as a warning.
 * @returns Basic Canvas counts for command output summaries.
 */
function validateCanvas(
  findings: ObsidianFinding[],
  checkLayout: boolean,
): { edgeCount: number; fileNodeCount: number; groupCount: number; indexLinkCount: number; nodeCount: number } {
  const canvasPath = 'docs/obsidian/KT 关系图谱.canvas';
  const canvas = readJsonFile<CanvasDocument>(canvasPath, findings);
  if (!canvas) return { edgeCount: 0, fileNodeCount: 0, groupCount: 0, indexLinkCount: 0, nodeCount: 0 };

  const nodes = Array.isArray(canvas.nodes) ? canvas.nodes : [];
  const edges = Array.isArray(canvas.edges) ? canvas.edges : [];
  const fileNodeCount = nodes.filter((node) => node.type === 'file').length;
  const indexLinkCount = extractCanvasIndexLinks(nodes).reduce((count, node) => count + node.links.length, 0);
  const nodeIds = new Set<string>();
  const edgeIds = new Set<string>();
  const groupLabels = new Set(nodes.filter((node) => node.type === 'group').map((node) => node.label).filter(Boolean));

  for (const node of nodes) {
    if (!node.id) {
      findings.push({
        check: 'canvas-node',
        level: 'error',
        message: 'Canvas 节点缺少 id。',
        path: canvasPath,
      });
      continue;
    }

    if (nodeIds.has(node.id)) {
      findings.push({
        check: 'canvas-node',
        level: 'error',
        message: 'Canvas 节点 id 重复。',
        path: canvasPath,
        target: node.id,
      });
    }
    nodeIds.add(node.id);

    if (node.type === 'file') {
      findings.push({
        check: 'canvas-node',
        level: 'error',
        message: 'KT 关系图谱必须使用文本索引节点，不能使用会嵌入全文预览的 file 节点。',
        path: canvasPath,
        target: node.id,
      });
    }

    if (node.type === 'text' && (node.text?.length || 0) > canvasTextNodeMaxChars) {
      findings.push({
        check: 'canvas-node',
        level: 'error',
        message: 'Canvas 文本节点过长，可能在 Obsidian 中出现内部滚动条。',
        path: canvasPath,
        target: `${node.id || 'unknown'}:${node.text?.length || 0}`,
      });
    }

    if (node.type === 'file' && node.file && !existsSync(resolveInsideRoot(node.file))) {
      findings.push({
        check: 'canvas-file',
        level: 'error',
        message: 'Canvas 文件节点目标不存在。',
        path: canvasPath,
        target: node.file,
      });
    }
  }

  for (const edge of edges) {
    if (!edge.id) {
      findings.push({
        check: 'canvas-edge',
        level: 'error',
        message: 'Canvas 边缺少 id。',
        path: canvasPath,
      });
      continue;
    }

    if (edgeIds.has(edge.id)) {
      findings.push({
        check: 'canvas-edge',
        level: 'error',
        message: 'Canvas 边 id 重复。',
        path: canvasPath,
        target: edge.id,
      });
    }
    edgeIds.add(edge.id);

    if (!edge.fromNode || !nodeIds.has(edge.fromNode) || !edge.toNode || !nodeIds.has(edge.toNode)) {
      findings.push({
        check: 'canvas-edge',
        level: 'error',
        message: 'Canvas 边引用了不存在的节点。',
        path: canvasPath,
        target: edge.id,
      });
    }
  }

  requiredCanvasGroupLabels
    .filter((label) => !groupLabels.has(label))
    .forEach((label) => {
      findings.push({
        check: 'canvas-group',
        level: 'error',
        message: 'Canvas 缺少工程任务流泳道。',
        path: canvasPath,
        target: label,
      });
    });

  if (checkLayout) {
    const visibleNodes = nodes.filter((node) => node.type !== 'group');
    for (let index = 0; index < visibleNodes.length; index += 1) {
      for (let nextIndex = index + 1; nextIndex < visibleNodes.length; nextIndex += 1) {
        const current = visibleNodes[index];
        const next = visibleNodes[nextIndex];
        if (current && next && rectanglesOverlap(current, next)) {
          findings.push({
            check: 'canvas-layout',
            level: 'warning',
            message: 'Canvas 非分组节点存在重叠，可能影响图谱可读性。',
            path: canvasPath,
            target: `${current.id || 'unknown'} <-> ${next.id || 'unknown'}`,
          });
        }
      }
    }
  }

  return {
    edgeCount: edges.length,
    fileNodeCount,
    groupCount: groupLabels.size,
    indexLinkCount,
    nodeCount: nodes.length,
  };
}

/**
 * Extracts Obsidian Base view names from the repository-owned YAML subset without adding a parser dependency.
 * @param content - Text content of `KT 文档矩阵.base`.
 * @returns View names declared below the `views:` section.
 */
function extractBaseViewNames(content: string): string[] {
  const names: string[] = [];
  const lines = content.split(/\r?\n/);
  let inViews = false;
  let currentView = false;

  for (const line of lines) {
    if (/^views:\s*$/.test(line)) {
      inViews = true;
      currentView = false;
      continue;
    }
    if (inViews && /^[A-Za-z_][A-Za-z0-9_-]*:\s*/.test(line)) {
      break;
    }
    if (!inViews) continue;

    if (/^\s*-\s+type:\s+/.test(line)) {
      currentView = true;
      continue;
    }

    const name = line.match(/^\s+name:\s+(.+)$/)?.[1];
    if (currentView && name) {
      names.push(stripYamlQuotes(name));
      currentView = false;
    }
  }

  return names;
}

/**
 * Validates the engineering Base shape used by the KT Obsidian document matrix.
 * @param findings - Shared finding accumulator for the current Obsidian validation run.
 * @returns Base section and view summary for command output.
 */
function validateBaseFile(findings: ObsidianFinding[]): Record<string, unknown> {
  const basePath = 'docs/obsidian/KT 文档矩阵.base';
  if (!existsSync(resolveInsideRoot(basePath))) {
    findings.push({
      check: 'base',
      level: 'error',
      message: 'Base 文件不存在。',
      path: basePath,
    });
    return { views: 0 };
  }

  const content = readTextFile(basePath);
  const requiredTokens = ['filters:', 'properties:', 'views:', 'type: table', 'type: cards'];
  for (const token of requiredTokens) {
    if (!content.includes(token)) {
      findings.push({
        check: 'base',
        level: 'error',
        message: `Base 文件缺少必要结构：${token}`,
        path: basePath,
      });
    }
  }

  const viewNames = extractBaseViewNames(content);
  requiredBaseViewNames
    .filter((viewName) => !viewNames.includes(viewName))
    .forEach((viewName) => {
      findings.push({
        check: 'base-view',
        level: 'error',
        message: 'Base 缺少工程控制视图。',
        path: basePath,
        target: viewName,
      });
    });

  return {
    hasCardsView: content.includes('type: cards'),
    hasTableView: content.includes('type: table'),
    requiredViews: requiredBaseViewNames.length,
    viewNames,
    views: viewNames.length,
  };
}

/**
 * Validates that module MOC files carry routing metadata for Base views and `obsidian-context`.
 * @param findings - Shared finding accumulator for the current Obsidian validation run.
 * @returns Number of module notes inspected.
 */
function validateModuleFrontmatter(findings: ObsidianFinding[]): number {
  const moduleFiles = listFiles(resolveInsideRoot('docs/obsidian/modules'), new Set(['.md']))
    .map(relativeToWorkspace)
    .filter((file) => file !== 'docs/obsidian/modules/KT 模块索引.md');
  const routeFields = ['rule_anchors', 'code_anchors', 'workflow_entries', 'validation_entries'];

  for (const file of moduleFiles) {
    const fields = parseFrontmatterFields(readTextFile(file));
    for (const requiredField of ['kt_type', 'module']) {
      const value = fields.get(requiredField);
      if (!value || (Array.isArray(value) && value.length === 0)) {
        findings.push({
          check: 'module-frontmatter',
          level: 'error',
          message: '模块页缺少 Obsidian 工程路由 frontmatter 字段。',
          path: file,
          target: requiredField,
        });
      }
    }

    const hasRouteField = routeFields.some((field) => {
      const value = fields.get(field);
      return Array.isArray(value) ? value.length > 0 : Boolean(value);
    });
    if (!hasRouteField) {
      findings.push({
        check: 'module-frontmatter',
        level: 'error',
        message: '模块页没有 rule/code/workflow/validation 任一工程锚点。',
        path: file,
        target: routeFields.join('|'),
      });
    }
  }

  return moduleFiles.length;
}

/**
 * Rejects accidental nested Obsidian documents created by resolving wiki links from inside `docs/obsidian`.
 * @param findings - Shared finding accumulator for the current Obsidian validation run.
 * @returns Number of nested files found, or 1 when only the invalid directory exists.
 */
function validateNoNestedObsidianDocs(findings: ObsidianFinding[]): number {
  const nestedRoot = 'docs/obsidian/docs';
  const absoluteRoot = resolveInsideRoot(nestedRoot);
  if (!existsSync(absoluteRoot)) return 0;

  const nestedFiles = listFiles(absoluteRoot, new Set(['.base', '.canvas', '.json', '.md']))
    .map(relativeToWorkspace);
  findings.push({
    check: 'obsidian-nested-docs',
    level: 'error',
    message: 'docs/obsidian 下出现误嵌套 docs 目录；Obsidian 索引只能放在 docs/obsidian 根层和 modules 层。',
    path: nestedRoot,
    target: nestedFiles.join(', ') || nestedRoot,
  });
  return nestedFiles.length || 1;
}

function validateStaleReferences(findings: ObsidianFinding[]): number {
  const scanFiles = listFiles(workspaceRoot, new Set(['.md', '.ps1', '.sh', '.ts', '.yaml', '.yml']));
  let hitCount = 0;

  for (const absolutePath of scanFiles) {
    const relativePath = relativeToWorkspace(absolutePath);
    if (relativePath === 'mcp/ktWorkflow/src/tools/obsidian.ts') continue;

    const lines = readFileSync(absolutePath, 'utf8').split(/\r?\n/);

    lines.forEach((line, index) => {
      const matchedPattern = staleReferencePatterns.find((pattern) => line.includes(pattern));
      if (!matchedPattern) return;

      hitCount += 1;
      const allowed = allowedStaleReferenceHints.some((hint) => line.includes(hint));
      findings.push({
        check: 'stale-reference',
        level: allowed ? 'info' : 'warning',
        message: allowed ? '旧引用只作为禁用规则或清理记录保留。' : '发现旧入口或已删除文档引用，请确认是否还需要保留。',
        path: `${relativePath}:${index + 1}`,
        target: matchedPattern,
      });
    });
  }

  return hitCount;
}

function countByLevel(findings: ObsidianFinding[]): Record<FindingLevel, number> {
  return findings.reduce<Record<FindingLevel, number>>(
    (result, finding) => {
      result[finding.level] += 1;
      return result;
    },
    { error: 0, info: 0, warning: 0 },
  );
}

export function validateObsidianVault(input: ObsidianValidateInput = {}): Record<string, unknown> {
  const options = normalizeInput(input);
  const findings: ObsidianFinding[] = [];

  for (const configFile of obsidianConfigFiles) {
    readJsonFile<Record<string, unknown>>(configFile, findings);
  }

  const base = validateBaseFile(findings);
  const canvas = validateCanvas(findings, options.checkLayout);
  const moduleFrontmatterCount = validateModuleFrontmatter(findings);
  const nestedDocsCount = validateNoNestedObsidianDocs(findings);
  const wikiLinkCount = validateWikiLinks(findings);
  const markdownLinkCount = options.includeMarkdownLinks ? validateMarkdownLinks(findings) : 0;
  const staleReferenceCount = options.includeStaleReferences ? validateStaleReferences(findings) : 0;
  const levels = countByLevel(findings);
  const ok = levels.error === 0 && (!options.failOnWarnings || levels.warning === 0);

  return {
    checks: {
      base,
      canvas,
      configFiles: obsidianConfigFiles.length,
      markdownLinks: markdownLinkCount,
      moduleFrontmatter: moduleFrontmatterCount,
      nestedDocs: nestedDocsCount,
      staleReferences: staleReferenceCount,
      wikiLinks: wikiLinkCount,
    },
    findings,
    ok,
    options,
    summary: {
      errors: levels.error,
      infos: levels.info,
      warnings: levels.warning,
    },
  };
}

export function readObsidianContext(input: ObsidianContextInput = {}): Record<string, unknown> {
  const maxDocuments = Math.min(Math.max(input.maxDocuments || 8, 1), 30);
  const terms = buildContextTerms(input);
  const codeAnchors = buildCodeAnchors(terms, Math.min(maxDocuments, 8));
  const ruleAnchors = buildRuleAnchors(codeAnchors);
  const includeContent = input.includeContent !== false;
  const allPaths = Array.from(new Set([...defaultContextPaths, ...listObsidianMarkdownPaths()]));
  const scoredPaths = allPaths
    .map((relativePath) => ({
      relativePath,
      score: scoreContextPath(relativePath, terms),
    }))
    .filter((item) => defaultContextPaths.includes(item.relativePath) || item.score > 0)
    .sort((left, right) => {
      if (right.score !== left.score) return right.score - left.score;
      return left.relativePath.localeCompare(right.relativePath, 'zh-Hans-CN');
    });

  const selectedPaths = scoredPaths.slice(0, maxDocuments).map((item) => item.relativePath);
  const documents = selectedPaths.map((relativePath) => readContextDocument(relativePath, includeContent, terms));

  return {
    canvas: readCanvasSummary(input.includeCanvas),
    codeAnchors,
    commands: [
      'pnpm --dir mcp/ktWorkflow run obsidian-context',
      'pnpm --dir mcp/ktWorkflow run obsidian-validate',
    ],
    documents,
    ok: true,
    route: {
      defaultIndex: defaultContextPaths,
      module: input.module?.trim() || null,
      query: input.query?.trim() || null,
      terms,
    },
    ruleAnchors,
    summary: {
      allIndexedDocuments: allPaths.length,
      codeAnchors: codeAnchors.length,
      ruleAnchors: ruleAnchors.length,
      returnedDocuments: documents.length,
    },
    workflowAnchors: [
      {
        input: {
          includeFullDocs: false,
          taskRecordCount: 3,
        },
        name: 'kt_read_context',
        purpose: '读取当前任务记录、项目清单和根目录规则，补齐 Obsidian 文档索引之外的运行上下文。',
      },
      ...codeAnchors.map((anchor) => ({
        input: {
          includeGit: true,
          project: anchor.alias,
        },
        name: 'kt_inspect_project',
        purpose: `锚定 ${anchor.label} 的仓库状态、包管理器、Node 和 env。`,
      })),
    ],
  };
}

function readOptionalJson<T>(relativePath: string): T | null {
  if (!existsSync(resolveInsideRoot(relativePath))) return null;
  try {
    return JSON.parse(readTextFile(relativePath)) as T;
  } catch {
    return null;
  }
}

/**
 * Recursively collects file paths from Obsidian bookmarks, including grouped bookmark sections.
 * @param items - Bookmark items from `.obsidian/bookmarks.json`.
 * @returns File paths referenced by bookmark entries.
 */
function collectBookmarkPaths(items: BookmarkItem[]): string[] {
  return items.flatMap((item) => [
    ...(item.path ? [item.path] : []),
    ...(item.items ? collectBookmarkPaths(item.items) : []),
  ]);
}

function buildSyncFindings(): ObsidianFinding[] {
  const findings: ObsidianFinding[] = [];
  const missingFiles = expectedObsidianFiles.filter((file) => !existsSync(resolveInsideRoot(file)));

  missingFiles.forEach((file) => {
    findings.push({
      check: 'expected-file',
      level: 'error',
      message: 'Obsidian 工作流入口文件缺失。',
      path: file,
    });
  });

  const bookmarks = readOptionalJson<BookmarkSettings>('.obsidian/bookmarks.json');
  const bookmarkPaths = new Set(collectBookmarkPaths(bookmarks?.items || []));
  requiredBookmarkPaths
    .filter((file) => !bookmarkPaths.has(file))
    .forEach((file) => {
      findings.push({
        check: 'bookmarks',
        level: 'warning',
        message: '常用入口没有加入 Obsidian 书签。',
        path: '.obsidian/bookmarks.json',
        target: file,
      });
    });

  const corePlugins = readOptionalJson<Record<string, boolean>>('.obsidian/core-plugins.json') || {};
  requiredCorePlugins
    .filter((pluginName) => corePlugins[pluginName] !== true)
    .forEach((pluginName) => {
      findings.push({
        check: 'core-plugins',
        level: 'warning',
        message: '推荐启用的 Obsidian 核心插件没有开启。',
        path: '.obsidian/core-plugins.json',
        target: pluginName,
      });
    });

  const appSettings = readOptionalJson<ObsidianSettings>('.obsidian/app.json');
  const ignoredRoots = new Set(appSettings?.userIgnoreFilters || []);
  expectedIgnoredRoots
    .filter((root) => !ignoredRoots.has(root))
    .forEach((root) => {
      findings.push({
        check: 'app-ignore',
        level: 'warning',
        message: '源码或运行态目录没有加入 Obsidian 忽略列表，可能污染关系图。',
        path: '.obsidian/app.json',
        target: root,
      });
    });

  if (appSettings?.attachmentFolderPath !== 'docs/assets/obsidian') {
    findings.push({
      check: 'attachments',
      level: 'warning',
      message: '附件目录建议固定到 docs/assets/obsidian。',
      path: '.obsidian/app.json',
      target: appSettings?.attachmentFolderPath || '',
    });
  }

  return findings;
}

export function syncObsidianWorkflow(input: ObsidianSyncInput = {}): Record<string, unknown> {
  const includeValidation = input.includeValidation !== false;
  const syncFindings = buildSyncFindings();
  const validation = includeValidation ? validateObsidianVault(input) : null;
  const validationFindings = (validation?.findings || []) as ObsidianFinding[];
  const findings = [...syncFindings, ...validationFindings];
  const levels = countByLevel(findings);
  const ok = levels.error === 0 && (input.failOnWarnings !== true || levels.warning === 0);

  return {
    commands: [
      'pnpm --dir mcp/ktWorkflow run obsidian-validate',
      'pnpm --dir mcp/ktWorkflow run obsidian-sync',
      'pnpm --dir mcp/ktWorkflow run self-test',
    ],
    findings,
    nextActions:
      findings.length === 0
        ? ['Obsidian 图谱、配置和工作流入口已连通；后续文档改动后复跑 obsidian-validate。']
        : ['先修复 error；warning 确认后可进入 TASKS.md 或 docs/obsidian 记录。'],
    ok,
    summary: {
      errors: levels.error,
      expectedFiles: expectedObsidianFiles.length,
      infos: levels.info,
      warnings: levels.warning,
    },
    validation,
  };
}