/** Generate model-visible Host/Client Service and Event inspect catalogs. */

import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs'
import { dirname, resolve } from 'node:path'
import { projectCordisCatalog } from '@deepseek-ai/dsh-typert-generator'
import type { CordisCatalogModel, ServiceMethodEntry } from '@deepseek-ai/dsh-typert-generator'
import { CORDIS_CATALOG_POLICY } from './gen-cordis-catalog.ts'

const root = resolve(import.meta.dirname, '..')
const CLIENT_OUT = 'packages/extensions/cordis-client-runner/src/client/api-catalog.ts'

const CLIENT_SERVICES: Readonly<Record<string, readonly string[]>> = {
  layout: ['toggleSidebar', 'openDetails', 'closeDetails'],
  locale: ['getLocale', 'getSnapshot', 'subscribe', 'setLocale', 'addLanguage', 'register', 'bind'],
  sessions: ['open', 'openSubagent', 'setSubagentCatalogOpen', 'refreshSubagents', 'search', 'fork', 'scope', 'binding'],
  slots: ['register', 'inject'],
  theme: ['getTheme', 'setTheme', 'setFontSize', 'register', 'overrideTokens'],
  uiWorkspace: [
    'connectWorkspace', 'startSession', 'archiveSession', 'pickDirectory', 'listDirectory',
    'createDirectory',
  ],
  workspaces: ['create', 'rename', 'delete', 'insertSessionBefore', 'archiveSession'],
}

const CLIENT_EVENTS = new Set([
  'connection/reset',
  'locale/change',
  'slots/changed',
  'theme/change',
])

function methodName(method: ServiceMethodEntry): string | undefined {
  return /^(?:declare\s+)?(?:readonly\s+)?(?:async\s+)?([A-Za-z_$][\w$]*)/.exec(method.signature)?.[1]
}

function clientModel(model: CordisCatalogModel): CordisCatalogModel {
  const services = Object.entries(CLIENT_SERVICES).map(([key, allowed]) => {
    const matches = model.services.filter(service => service.key === key)
    if (matches.length !== 1) {
      throw new Error(`gen-cordis-inspect-catalog: expected one Client Service ${JSON.stringify(key)}, found ${matches.length}`)
    }
    const service = matches[0] as (typeof matches)[number]
    const names = new Set(allowed)
    const methods = service.methods.filter(method => names.has(methodName(method) ?? ''))
    const found = new Set(methods.map(method => methodName(method)))
    const missing = allowed.filter(name => !found.has(name))
    if (missing.length > 0) {
      throw new Error(
        `gen-cordis-inspect-catalog: Client Service ${JSON.stringify(key)}`
        + ` is missing allowlisted method(s): ${missing.join(', ')}`,
      )
    }
    return { ...service, methods }
  })
  const events = [...CLIENT_EVENTS].map((name) => {
    const matches = model.events.filter(event => event.name === name)
    if (matches.length !== 1) {
      throw new Error(`gen-cordis-inspect-catalog: expected one Client Event ${JSON.stringify(name)}, found ${matches.length}`)
    }
    return matches[0] as (typeof matches)[number]
  })
  return {
    services,
    events,
  }
}

function main(): void {
  const { projector, model } = projectCordisCatalog(root, CORDIS_CATALOG_POLICY, 'client')
  const destination = resolve(root, CLIENT_OUT)
  const source = projector.renderRuntimeApi(clientModel(model))
    .replace('Generated by scripts/gen-cordis-api.ts', 'Generated by scripts/gen-cordis-inspect-catalog.ts')
    .replaceAll('pnpm run gen-cordis-api', 'pnpm run gen-cordis-inspect-catalog')
    .replaceAll('pnpm run verify-cordis-api', 'pnpm run verify-cordis-inspect-catalog')
    .replaceAll('@deepseek-ai/dsh-tool-cordis/api-catalog', '@deepseek-ai/dsh-cordis-client-runner/client/api-catalog')
  if (process.argv.includes('--check')) {
    if (!existsSync(destination) || readFileSync(destination, 'utf8') !== source) {
      throw new Error(`gen-cordis-inspect-catalog: ${CLIENT_OUT} is stale; run pnpm run gen-cordis-inspect-catalog`)
    }
    console.log(`gen-cordis-inspect-catalog: ${CLIENT_OUT} is up to date`)
    return
  }
  mkdirSync(dirname(destination), { recursive: true })
  writeFileSync(destination, source)
  console.log(`gen-cordis-inspect-catalog: wrote ${CLIENT_OUT}`)
}

main()