/**
 * Real-composition guard for the dormant pi-ai posture: LlmService,
 * settings-local, credentials-local, and a bare `llm-pi-ai` row boot from a
 * test-only cordis.yml through the actual Loader + Include path, an external
 * edit of settings.yaml registers the route live, and the next request
 * carries the credential the .env supplies. A hand-mounted `ctx.plugin` cannot
 * catch Loader export-shape failures, which is why the twin adapter has the
 * same guard.
 */

import { mkdtemp, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { pathToFileURL } from 'node:url'
import { afterEach, describe, expect, it, vi } from 'vitest'
import { Context } from 'cordis'
import Loader from '@cordisjs/plugin-loader'
import Include from '@cordisjs/plugin-include'
import LlmService from '@deepseek-ai/dsh-llm'
import CredentialsLocal from '@deepseek-ai/dsh-credentials-local'
import SettingsLocal from '@deepseek-ai/dsh-settings-local'
import * as LlmPiAi from '@deepseek-ai/dsh-llm-pi-ai'
import { assemble } from './assemble.ts'
import { closeMockServers, mockServer, textEvents } from './mock-server.ts'

let root: string | undefined
let context: Context | undefined

afterEach(async () => {
  await context?.fiber.dispose()
  context = undefined
  if (root !== undefined) await rm(root, { recursive: true, force: true })
  root = undefined
  await closeMockServers()
  vi.unstubAllEnvs()
})

/** Boot the dormant composition: a bare `llm-pi-ai` row with no config at all. */
async function loadComposition(): Promise<{ ctx: Context; settingsPath: string }> {
  root = await mkdtemp(join(tmpdir(), 'dsh-pi-composition-'))
  const settingsPath = join(root, 'settings.yaml')
  await writeFile(settingsPath, '# personal settings\n')
  await writeFile(join(root, '.env'), 'PI_COMPOSITION_KEY=key-from-store\n')

  const configPath = join(root, 'cordis.yml')
  await writeFile(configPath, [
    '- id: llm',
    "  name: 'test-llm-service'",
    '- id: settings',
    "  name: '@deepseek-ai/dsh-settings-local'",
    '  config:',
    `    path: ${JSON.stringify(settingsPath)}`,
    '    debounceMs: 10',
    '- id: credentials',
    "  name: '@deepseek-ai/dsh-credentials-local'",
    '  config:',
    `    path: ${JSON.stringify(join(root, '.env'))}`,
    '    debounceMs: 10',
    '- id: llm-pi-ai',
    "  name: '@deepseek-ai/dsh-llm-pi-ai'",
    '',
  ].join('\n'))

  const ctx = new Context()
  context = ctx
  ctx.baseUrl = pathToFileURL(root).href + '/'
  await ctx.plugin(Loader)
  ctx.loader.builtins.include = Include
  const modules = new Map<string, unknown>([
    ['test-llm-service', LlmService],
    ['@deepseek-ai/dsh-settings-local', SettingsLocal],
    ['@deepseek-ai/dsh-credentials-local', CredentialsLocal],
    ['@deepseek-ai/dsh-llm-pi-ai', LlmPiAi],
  ])
  ctx.loader.internal = {
    version: 'v2',
    async import(specifier: string) {
      if (!modules.has(specifier)) throw new Error(`unexpected Loader import: ${specifier}`)
      return modules.get(specifier)
    },
  } as unknown as NonNullable<typeof ctx.loader.internal>
  await ctx.loader.create({
    name: 'cordis:include',
    config: { path: pathToFileURL(configPath).href },
  })
  await ctx.loader.await()
  return { ctx, settingsPath }
}

describe('llm-pi-ai real dormant composition', () => {
  it('boots with zero routes and registers one the moment settings supply a profile', async () => {
    vi.stubEnv('PI_COMPOSITION_KEY', '')
    const server = await mockServer([{ events: textEvents }])
    const { ctx, settingsPath } = await loadComposition()

    // The shipped posture: the adapter exists, no route does.
    expect(ctx.llm.listProviders()).toEqual([])

    // Exactly what the web Models page leaves on disk.
    await writeFile(settingsPath, [
      'llm-pi-ai:',
      '  providers:',
      '    deepseek:',
      '      apiKeyEnv: PI_COMPOSITION_KEY',
      `      baseURL: ${server.url}`,
      '',
    ].join('\n'))
    await vi.waitFor(() => {
      expect(ctx.llm.listProviders().map(provider => provider.id)).toEqual(['deepseek'])
    }, { timeout: 5000 })

    const result = await assemble(ctx, { provider: 'deepseek', model: 'deepseek-v4-flash', messages: [] })
    expect(result.message.content).toEqual([{ type: 'text', text: 'hello' }])
    expect(server.headers[0]?.authorization).toBe('Bearer key-from-store')
  })
})