/**
 * Tool Registry - 工具注册与调度中心
 * 管理所有可用工具的定义，负责执行调度
 */

import type { ToolDefinition, ToolResult } from '../types.js';
import { logToolStart, logToolResult, logError, logInfo } from './log-service.js';

export const TOOL_DEFINITIONS: ToolDefinition[] = [
  {
    type: 'function',
    function: {
      name: 'read_file',
      description: 'Read the contents of a local file. Returns the file content as a string. Supports text files up to 1MB. Use start_line/end_line for large files.',
      parameters: {
        type: 'object',
        required: ['path'],
        properties: {
          path: { type: 'string', description: 'The file path to read. Absolute or relative.' },
          encoding: { type: 'string', enum: ['utf-8', 'latin1', 'base64'], description: 'File encoding. Default: utf-8' },
          start_line: { type: 'integer', description: 'Start line (1-indexed). For reading specific sections.' },
          end_line: { type: 'integer', description: 'End line (inclusive). Default: start_line + 500.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'write_file',
      description: 'Write content to a local file. Creates parent directories automatically. Overwrites existing files. Max 5MB content.',
      parameters: {
        type: 'object',
        required: ['path', 'content'],
        properties: {
          path: { type: 'string', description: 'The file path to write to.' },
          content: { type: 'string', description: 'The content to write.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'list_directory',
      description: 'List directory contents. Returns file names, types, sizes, and modification times.',
      parameters: {
        type: 'object',
        required: ['path'],
        properties: {
          path: { type: 'string', description: 'Directory path.' },
          recursive: { type: 'boolean', description: 'List recursively. Default: false.' },
          max_depth: { type: 'integer', description: 'Max recursion depth. Default: 3.' },
          include_hidden: { type: 'boolean', description: 'Include hidden files. Default: false.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'search_files',
      description: 'Search files by name pattern or text content within files.',
      parameters: {
        type: 'object',
        required: ['path', 'query'],
        properties: {
          path: { type: 'string', description: 'Root directory to search.' },
          query: { type: 'string', description: 'Search query (glob or text).' },
          search_type: { type: 'string', enum: ['filename', 'content', 'both'], description: 'Search target. Default: both.' },
          case_sensitive: { type: 'boolean', description: 'Case sensitive. Default: false.' },
          max_results: { type: 'integer', description: 'Max results. Default: 50.' },
          file_extensions: { type: 'array', items: { type: 'string' }, description: 'Filter extensions, e.g. [".ts", ".js"]' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'create_directory',
      description: 'Create a new directory. Creates parents automatically.',
      parameters: {
        type: 'object',
        required: ['path'],
        properties: {
          path: { type: 'string', description: 'Directory path to create.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'delete_file',
      description: 'Delete a file or directory. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['path'],
        properties: {
          path: { type: 'string', description: 'Path to delete.' },
          recursive: { type: 'boolean', description: 'Recursive delete for directories. DANGEROUS.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'run_command',
      description: 'Execute a shell command via workspace. No timeout limit — runs until the process exits. Requires user confirmation. Output is streamed in real-time through the workspace process.',
      parameters: {
        type: 'object',
        required: ['command'],
        properties: {
          command: { type: 'string', description: 'Shell command to execute.' },
          cwd: { type: 'string', description: 'Working directory. Defaults to workspace directory.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'move_file',
      description: 'Move or rename a file/directory. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['source', 'destination'],
        properties: {
          source: { type: 'string', description: 'Source path.' },
          destination: { type: 'string', description: 'Destination path.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'copy_file',
      description: 'Copy a file or directory to a new location. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['source', 'destination'],
        properties: {
          source: { type: 'string', description: 'Source path.' },
          destination: { type: 'string', description: 'Destination path.' },
          recursive: { type: 'boolean', description: 'Copy directories recursively. Default: true.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'web_fetch',
      description: 'Fetch content from a URL. Returns the page text content (HTML stripped). Supports HTTP/HTTPS.',
      parameters: {
        type: 'object',
        required: ['url'],
        properties: {
          url: { type: 'string', description: 'URL to fetch (http/https).' },
          max_chars: { type: 'integer', description: 'Max characters to return. Default: 0 (no limit, return full content).' },
          extract_mode: { type: 'string', enum: ['text', 'markdown'], description: 'Extraction mode. Default: text.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'append_file',
      description: 'Append content to the end of a file. Creates the file if it doesn\'t exist. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['path', 'content'],
        properties: {
          path: { type: 'string', description: 'File path to append to.' },
          content: { type: 'string', description: 'Content to append.' },
          newline: { type: 'boolean', description: 'Add a newline before appending. Default: true.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'edit_file',
      description: 'Find and replace text in a file. More efficient than rewriting the whole file for small changes. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['path', 'old_text', 'new_text'],
        properties: {
          path: { type: 'string', description: 'File path to edit.' },
          old_text: { type: 'string', description: 'Exact text to find.' },
          new_text: { type: 'string', description: 'Replacement text.' },
          all: { type: 'boolean', description: 'Replace all occurrences. Default: false (replace first only).' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'get_file_info',
      description: 'Get detailed file or directory information: size, dates, permissions, type.',
      parameters: {
        type: 'object',
        required: ['path'],
        properties: {
          path: { type: 'string', description: 'File or directory path.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'tree',
      description: 'Display directory structure as a tree. Shows nested files and folders.',
      parameters: {
        type: 'object',
        required: ['path'],
        properties: {
          path: { type: 'string', description: 'Root directory path.' },
          max_depth: { type: 'integer', description: 'Max depth. Default: 3.' },
          include_hidden: { type: 'boolean', description: 'Include hidden files. Default: false.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'download_file',
      description: 'Download a file from a URL to a local path. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['url', 'destination'],
        properties: {
          url: { type: 'string', description: 'URL to download (http/https).' },
          destination: { type: 'string', description: 'Local path to save the file.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'diff_files',
      description: 'Compare two files and show differences. Returns a unified diff.',
      parameters: {
        type: 'object',
        required: ['file1', 'file2'],
        properties: {
          file1: { type: 'string', description: 'First file path.' },
          file2: { type: 'string', description: 'Second file path.' },
          context_lines: { type: 'integer', description: 'Context lines around changes. Default: 3.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'replace_in_files',
      description: 'Find and replace text across multiple files matching a glob pattern. Requires user confirmation.',
      parameters: {
        type: 'object',
        required: ['path', 'glob', 'old_text', 'new_text'],
        properties: {
          path: { type: 'string', description: 'Root directory.' },
          glob: { type: 'string', description: 'File pattern, e.g. "*.ts", "**/*.js".' },
          old_text: { type: 'string', description: 'Text to find.' },
          new_text: { type: 'string', description: 'Replacement text.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'read_multiple_files',
      description: 'Read multiple files at once. Returns contents of all requested files.',
      parameters: {
        type: 'object',
        required: ['paths'],
        properties: {
          paths: { type: 'array', items: { type: 'string' }, description: 'Array of file paths to read.' },
          max_chars_per_file: { type: 'integer', description: 'Max chars per file. Default: 2000.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'git',
      description: 'Git operations: status, log, diff, add, commit, push, pull, branch, checkout, merge, stash, remote, clone, init. All operations are automatic (no confirmation).',
      parameters: {
        type: 'object',
        required: ['action'],
        properties: {
          action: { type: 'string', enum: ['status', 'log', 'diff', 'add', 'commit', 'push', 'pull', 'branch', 'checkout', 'merge', 'stash', 'remote', 'clone', 'init', 'reset', 'tag'], description: 'Git action to perform.' },
          path: { type: 'string', description: 'Repository path. Defaults to workspace.' },
          files: { type: 'array', items: { type: 'string' }, description: 'Files for add/diff/checkout.' },
          message: { type: 'string', description: 'Commit message for commit action.' },
          branch: { type: 'string', description: 'Branch name for branch/checkout/merge.' },
          remote: { type: 'string', description: 'Remote name for push/pull/remote.' },
          remote_url: { type: 'string', description: 'Remote URL for remote add.' },
          count: { type: 'integer', description: 'Number of log entries. Default: 20.' },
          all: { type: 'boolean', description: 'Show all (branches, stashes, etc). Default: false.' },
          staged: { type: 'boolean', description: 'Show staged changes in diff. Default: false.' },
          new_branch: { type: 'boolean', description: 'Create new branch in branch action. Default: false.' },
          delete_branch: { type: 'boolean', description: 'Delete branch in branch action. Default: false.' },
          force: { type: 'boolean', description: 'Force push/checkout. Default: false.' },
          url: { type: 'string', description: 'Repository URL for clone.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'compress',
      description: 'Create or extract archives (zip/tar.gz). Requires user confirmation for create.',
      parameters: {
        type: 'object',
        required: ['action', 'path'],
        properties: {
          action: { type: 'string', enum: ['create', 'extract'], description: 'Create or extract archive.' },
          path: { type: 'string', description: 'Source path (create) or archive path (extract).' },
          destination: { type: 'string', description: 'Output archive path (create) or extract dir (extract).' },
          format: { type: 'string', enum: ['zip', 'tar.gz'], description: 'Archive format. Default: tar.gz.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'web_search',
      description: 'Search the web and return relevant results. Use this when you need to find current information, news, facts, or answer questions that require up-to-date knowledge beyond your training data.',
      parameters: {
        type: 'object',
        required: ['query'],
        properties: {
          query: { type: 'string', description: 'The search query. Be specific and concise for best results.' },
          max_results: { type: 'integer', description: 'Maximum number of results to return. Default: 15, max: 15.' }
        }
      }
    }
  },
  // ══════════════════════════════════════════════
  // v4.0 新增工具：记忆和会话管理
  // ══════════════════════════════════════════════
  {
    type: 'function',
    function: {
      name: 'memory_search',
      description: 'Search agent memories by semantic similarity or keywords. Returns relevant memories about the user, preferences, rules, and past conversations.',
      parameters: {
        type: 'object',
        required: ['query'],
        properties: {
          query: { type: 'string', description: 'Search query for memories.' },
          limit: { type: 'integer', description: 'Max results to return. Default: 8.' },
          type: { type: 'string', enum: ['fact', 'preference', 'rule'], description: 'Filter by memory type.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'memory_add',
      description: 'Add a new memory entry for future reference. Use when you learn something important about the user, their preferences, or rules they want you to follow.',
      parameters: {
        type: 'object',
        required: ['type', 'content'],
        properties: {
          type: { type: 'string', enum: ['fact', 'preference', 'rule'], description: 'Memory type: fact (about user), preference (user preference), rule (must follow).' },
          content: { type: 'string', description: 'The memory content. Be concise and specific.' },
          importance: { type: 'integer', description: 'Importance 1-10. Higher = more important. Default: 5.' },
          tags: { type: 'array', items: { type: 'string' }, description: 'Tags for search matching. 2-5 keywords.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'session_list',
      description: 'List previous chat sessions with their titles and timestamps. Useful for referencing past conversations.',
      parameters: {
        type: 'object',
        properties: {
          limit: { type: 'integer', description: 'Max sessions to return. Default: 20.' },
          search: { type: 'string', description: 'Filter sessions by title keyword.' }
        }
      }
    }
  },
  {
    type: 'function',
    function: {
      name: 'session_read',
      description: 'Read the messages from a previous chat session. Use when the user references something from a past conversation.',
      parameters: {
        type: 'object',
        required: ['session_id'],
        properties: {
          session_id: { type: 'string', description: 'The session ID to read.' },
          max_messages: { type: 'integer', description: 'Max messages to return. Default: 50.' }
        }
      }
    }
  }
];

const CONFIRM_TOOLS = ['run_command'];

export function needsConfirmation(toolName: string): boolean {
  if (toolName === 'run_command') {
    // run_command 确认模式由 runCommandMode 状态控制
    const runCommandMode = (window as any).__runCommandMode || 'confirm';
    return runCommandMode === 'confirm';
  }
  return CONFIRM_TOOLS.includes(toolName);
}

/** 设置 run_command 执行模式 */
export function setRunCommandMode(mode: 'auto' | 'confirm' | 'disabled'): void {
  (window as any).__runCommandMode = mode;
  if (mode === 'disabled') {
    setToolEnabled('run_command', false);
  } else {
    setToolEnabled('run_command', true);
  }
}

let enabledTools: Set<string> = new Set([
  'read_file', 'list_directory', 'search_files',
  'write_file', 'create_directory', 'delete_file',
  'run_command',
  'move_file', 'copy_file', 'web_fetch', 'web_search', 'append_file', 'edit_file',
  'get_file_info', 'tree', 'download_file', 'diff_files', 'replace_in_files',
  'read_multiple_files', 'git', 'compress',
  'memory_search', 'memory_add', 'session_list', 'session_read'
]);

export function setToolEnabled(toolName: string, enabled: boolean): void {
  if (enabled) enabledTools.add(toolName);
  else enabledTools.delete(toolName);
}

export function isToolEnabled(toolName: string): boolean {
  return enabledTools.has(toolName);
}

export function getEnabledToolDefinitions(): ToolDefinition[] {
  return TOOL_DEFINITIONS.filter(def => enabledTools.has(def.function.name));
}

export async function executeTool(toolName: string, args: Record<string, unknown>): Promise<ToolResult> {
  if (!isToolEnabled(toolName)) {
    logError(`工具未启用: ${toolName}`);
    return { success: false, error: `工具 ${toolName} 未启用` };
  }

  const bridge = window.metonaDesktop;
  if (!bridge?.isDesktop) {
    logError(`工具调用仅支持桌面版: ${toolName}`);
    return { success: false, error: '工具调用仅支持桌面版' };
  }

  try {
    // 内存工具（不走 IPC，直接处理）
    if (toolName === 'memory_search') {
      const { searchMemories } = await import('./memory-manager.js');
      const query = args.query as string;
      const limit = (args.limit as number) || 8;
      const type = args.type as string | undefined;
      let results = searchMemories(query, limit);
      if (type) results = results.filter(r => r.type === type);
      logToolResult('memory_search', true, `${results.length} 条结果`);
      return { success: true, results, total: results.length };
    }
    if (toolName === 'memory_add') {
      const { addMemory } = await import('./memory-manager.js');
      const type = args.type as 'fact' | 'preference' | 'rule';
      const content = args.content as string;
      const importance = (args.importance as number) || 5;
      const tags = (args.tags as string[]) || [];
      if (!content || content.length < 2) {
        return { success: false, error: 'content 不能为空且至少 2 个字符' };
      }
      const entry = await addMemory({ type, content, importance, tags });
      logToolResult('memory_add', true, `${type}: ${content.slice(0, 50)}`);
      return { success: true, id: entry.id, type: entry.type, content: entry.content };
    }
    if (toolName === 'session_list') {
      const bridge = window.metonaDesktop;
      if (!bridge?.db) return { success: false, error: '桌面 API 不可用' };
      const limit = (args.limit as number) || 20;
      const search = (args.search as string) || '';
      const sessions = await bridge.db.getAllSessions();
      let filtered = sessions.map((s: any) => ({
        id: s.id,
        title: s.title,
        model: s.model,
        messageCount: 0, // 从 SQLite 获取的原始行不含 messages
        createdAt: s.created_at,
        updatedAt: s.updated_at
      }));
      if (search) {
        filtered = filtered.filter((s: any) => s.title.toLowerCase().includes(search.toLowerCase()));
      }
      filtered.sort((a: any, b: any) => b.updatedAt - a.updatedAt);
      filtered = filtered.slice(0, limit);
      logToolResult('session_list', true, `${filtered.length} 个会话`);
      return { success: true, sessions: filtered, total: filtered.length };
    }
    if (toolName === 'session_read') {
      const bridge = window.metonaDesktop;
      if (!bridge?.db) return { success: false, error: '桌面 API 不可用' };
      const sessionId = args.session_id as string;
      const maxMessages = (args.max_messages as number) || 50;
      if (!sessionId) return { success: false, error: '缺少 session_id 参数' };
      const session = await bridge.db.getSession(sessionId);
      if (!session) return { success: false, error: `会话 ${sessionId} 不存在` };
      const messages = await bridge.db.getMessages(sessionId);
      const msgs = messages.slice(0, maxMessages).map((m: any) => ({
        role: m.role,
        content: m.content || '',
        timestamp: m.created_at
      }));
      logToolResult('session_read', true, `${msgs.length} 条消息`);
      return { success: true, session: { id: session.id, title: session.title, model: session.model }, messages: msgs, total: messages.length };
    }

    // run_command 走 workspace IPC
    if (toolName === 'run_command') {
      const command = args.command as string;
      const cwd = args.cwd as string | undefined;
      if (!command) {
        return { success: false, error: '缺少 command 参数' };
      }
      logInfo(`工作空间命令执行: ${command.slice(0, 100)}`);
      const result = await bridge.workspace.execTool(command, cwd);
      logToolResult('run_command', result.success, result.success ? undefined : result.stderr?.slice(0, 200));
      return {
        success: result.success,
        stdout: result.stdout,
        stderr: result.stderr,
        exitCode: result.exitCode,
        duration: result.duration
      };
    }

    // 其他工具：IPC 调用 + 25 秒硬超时
    const result = await Promise.race([
      bridge.tool.execute(toolName, args),
      new Promise<ToolResult>((_, reject) =>
        setTimeout(() => reject(new Error(`工具 ${toolName} IPC 超时（25秒）`)), 25000)
      )
    ]);
    logToolResult(toolName, result.success, result.success ? undefined : result.error);
    return result;
  } catch (err) {
    logError(`工具异常: ${toolName}`, (err as Error).message);
    return { success: false, error: (err as Error).message };
  }
}

export function getToolIcon(name: string): string {
  const icons: Record<string, string> = {
    read_file: '📄', write_file: '✏️', list_directory: '📁',
    search_files: '🔍', create_directory: '📂', delete_file: '🗑️', run_command: '💻',
    move_file: '📦', copy_file: '📋', web_fetch: '🌐', append_file: '➕',
    edit_file: '✂️', get_file_info: 'ℹ️', tree: '🌳', download_file: '⬇️',
    diff_files: '🔀', replace_in_files: '🔄', read_multiple_files: '📚',
    git: '🔖', compress: '🗜️', web_search: '🔍',
    memory_search: '🧠', memory_add: '💾', session_list: '📋', session_read: '📖'
  };
  return icons[name] || '🔧';
}

export function formatToolName(name: string): string {
  const names: Record<string, string> = {
    read_file: '读取文件', write_file: '写入文件', list_directory: '列出目录',
    search_files: '搜索文件', create_directory: '创建目录', delete_file: '删除文件',
    run_command: '执行命令', move_file: '移动文件', copy_file: '复制文件',
    web_fetch: '网页抓取', append_file: '追加文件', edit_file: '编辑文件',
    get_file_info: '文件信息', tree: '目录树', download_file: '下载文件',
    diff_files: '文件对比', replace_in_files: '批量替换', read_multiple_files: '批量读取',
    git: 'Git 操作', compress: '压缩/解压', web_search: '联网搜索',
    memory_search: '搜索记忆', memory_add: '添加记忆', session_list: '会话列表', session_read: '读取会话'
  };
  return names[name] || name;
}