// MCP Gateway 的内置工具（两个引擎共用）：文档转换、公式重算、网页抓取、资料库列表
import path from 'node:path'
import { z } from 'zod'
import type { McpBuiltinToolDto } from '@agent-server/shared'
import { CONVERT_FORMATS, convertDocument, recalcWorkbook } from '../services/office'
import { describeKnowledge, linkOrigins } from '../knowledge/describe'
import { FetchBlockedError, webFetch } from '../services/web-fetch'
import type { GatewayRunContext } from './tokens'

export type ToolContent = { type: string; [key: string]: unknown }
export type ToolResult = { content: ToolContent[]; isError?: boolean }
export const ok = (text: string): ToolResult => ({ content: [{ type: 'text', text }] })
export const fail = (text: string): ToolResult => ({ content: [{ type: 'text', text }], isError: true })

export interface BuiltinTool {
  name: string
  description: string
  schema: z.ZodObject
  readOnly: boolean
  handler(args: Record<string, unknown>, ctx: GatewayRunContext): Promise<ToolResult>
}

const readonlyBlock = (ctx: GatewayRunContext) => (ctx.permissionMode === 'readonly' ? fail('当前为只读模式，不允许生成或修改文件') : null)

const convertSchema = z.object({
  input: z.string().describe('输入文件路径（相对工作区或绝对路径）'),
  format: z.enum(CONVERT_FORMATS).describe('目标格式'),
  out_dir: z.string().optional().describe('输出目录，默认 outputs'),
})
const recalcSchema = z.object({ input: z.string().describe('xlsx/xlsm 文件路径（相对工作区或绝对路径）') })
const fetchSchema = z.object({ url: z.string().describe('http/https 网址') })

export const BUILTIN_TOOLS: BuiltinTool[] = [
  {
    name: 'convert_document',
    description: '用 LibreOffice 转换文档格式（例如 docx→pdf、xlsx→pdf、pptx→pdf、doc→docx、html→pdf）。'
      + '输入和输出都必须在工作区内；输出文件名与输入相同、扩展名换成目标格式。不要在命令行里调用 soffice，它在沙箱中无法运行。',
    schema: convertSchema,
    readOnly: false,
    async handler(raw, ctx) {
      const blocked = readonlyBlock(ctx)
      if (blocked) return blocked
      const args = raw as z.infer<typeof convertSchema>
      const out = await convertDocument({ workspaceDir: ctx.workspaceDir, input: args.input, format: args.format, outDir: args.out_dir })
      return ok(`已生成：${path.relative(ctx.workspaceDir, out)}`)
    },
  },
  {
    name: 'recalc_workbook',
    description: '用 LibreOffice 重新计算 Excel 文件中的所有公式并写回原文件，然后报告公式数量和错误单元格（#REF!、#DIV/0! 等）。'
      + '用 openpyxl 写入公式后必须调用它，否则文件里没有计算结果。不要在命令行里调用 soffice 或 recalc.py，它们在沙箱中无法运行。',
    schema: recalcSchema,
    readOnly: false,
    async handler(raw, ctx) {
      const blocked = readonlyBlock(ctx)
      if (blocked) return blocked
      const args = raw as z.infer<typeof recalcSchema>
      const r = await recalcWorkbook({ workspaceDir: ctx.workspaceDir, input: args.input, pythonRuntime: ctx.settings.paths.pythonRuntime })
      const lines = [`已重算：${path.relative(ctx.workspaceDir, r.path)}，公式 ${r.formulas} 个，错误 ${r.errorCount} 个`]
      for (const e of r.errors) lines.push(`- ${e.sheet}!${e.cell}: ${e.error}`)
      return r.errorCount > 0 ? fail(lines.join('\n')) : ok(lines.join('\n'))
    },
  },
  {
    name: 'web_fetch',
    description: '抓取网页并转换为 Markdown（HTML），或原样返回文本/JSON；PDF、图片、表格等二进制文件会下载到工作区并返回路径。'
      + '内容过长时只返回前一部分，完整内容保存在工作区。不能访问内网地址（网络链接资料库所在站点除外）。',
    schema: fetchSchema,
    readOnly: true,
    async handler(raw, ctx) {
      const args = raw as z.infer<typeof fetchSchema>
      try {
        const r = await webFetch({ url: args.url, workspaceDir: ctx.workspaceDir, blockPrivate: ctx.settings.network.blockPrivateFetch, allowOrigins: linkOrigins(ctx.knowledgeRoots) })
        const head = `URL: ${r.url}\n状态: ${r.status}\n类型: ${r.contentType}${r.savedPath ? `\n${r.truncated ? '完整内容' : '文件'}已保存到: ${r.savedPath}` : ''}${r.truncated ? '\n（内容过长，以下为前一部分）' : ''}\n\n`
        return r.status >= 400 ? fail(head + r.text) : ok(head + r.text)
      } catch (err) {
        if (err instanceof FetchBlockedError) ctx.audit('network_denied', err.message, { url: args.url, engine: ctx.provider })
        throw err
      }
    },
  },
  {
    name: 'kb_list_roots',
    description: '列出当前可用的资料库（名称、类型、路径或链接、说明、读写属性、是否可用）。查找资料前先调用它。',
    schema: z.object({}),
    readOnly: true,
    async handler(_args, ctx) {
      if (!ctx.knowledgeRoots.length) return ok('当前没有可用的资料库。')
      return ok(describeKnowledge(ctx.knowledgeRoots))
    },
  },
]

export const BUILTIN_TOOL_INFO: McpBuiltinToolDto[] = BUILTIN_TOOLS.map(t => ({ name: t.name, description: t.description, readOnly: t.readOnly }))