import { describe, expect, it } from 'vitest'
import { Client } from '@modelcontextprotocol/sdk/client/index.js'
import { InMemoryTransport } from '@modelcontextprotocol/sdk/inMemory.js'
import { FIELDLENS_MCP_OAUTH_SCOPES, captureLimit, createFieldLensMcpServer } from './mcp.js'

describe('FieldLens MCP telemetry', () => {
  it('exposes only a bounded read-only diagnostic tool', async () => {
    const server = createFieldLensMcpServer()
    const client = new Client({ name: 'fieldlens-test', version: '1.0.0' })
    const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair()
    try {
      await Promise.all([server.connect(serverTransport), client.connect(clientTransport)])
      const { tools } = await client.listTools()
      expect(tools.map((tool) => tool.name)).toEqual(['list_print_captures'])
      expect(tools[0]?.annotations?.readOnlyHint).toBe(true)
      expect(tools[0]?.inputSchema.properties?.limit).toBeDefined()
      expect(tools[0]?._meta?.securitySchemes).toEqual([
        { type: 'oauth2', scopes: [...FIELDLENS_MCP_OAUTH_SCOPES] },
      ])
    } finally {
      await client.close()
      await server.close()
    }
  })

  it('clamps row count to a hard limit', () => {
    expect(captureLimit(0)).toBe(1)
    expect(captureLimit(500)).toBe(200)
    expect(captureLimit(Number.NaN)).toBe(50)
  })
})