/**
 * Build lib/index.js (host) and lib/agent-tools*.js (preset tool mounts).
 * Node refuses to strip TypeScript inside node_modules, so GitHub/npm installs
 * must ship prebuilt JS. Usage: bun run scripts/build-host.mjs
 *
 * Agent-tools entries are built as self-contained bundles (no shared chunk).
 * Cordis/Desktop load each export path independently; a split chunk once missed
 * a connection-publish race and is harder to reason about under custom loaders.
 */
import { mkdirSync, readdirSync, rmSync, writeFileSync } from 'node:fs'
import { basename, dirname, isAbsolute, join, relative, resolve } from 'node:path'
import { fileURLToPath } from 'node:url'
import { recordBuild } from './build-integrity.mjs'

const root = join(dirname(fileURLToPath(import.meta.url)), '..')
const outDir = join(root, 'lib')

const external = [
  '@deepseek-ai/cordis',
  '@deepseek-ai/schemastery',
  '@deepseek-ai/dsh-credentials',
  '@deepseek-ai/dsh-settings',
  '@deepseek-ai/dsh-tools',
  '@deepseek-ai/dsh-scope',
  '@deepseek-ai/dsh-llm',
  '@deepseek-ai/dsh-brand',
  '@deepseek-ai/dsh-agent',
  '@deepseek-ai/dsh-agent-presets',
  '@deepseek-ai/dsh-workspace',
  '@deepseek-ai/dsh-session',
  '@deepseek-ai/dsh-session-title',
  '@deepseek-ai/dsh-permission-presets',
  '@deepseek-ai/dsh-agent-default-model',
]

const entries = [
  { entry: join(root, 'src/index.ts'), out: join(outDir, 'index.js') },
  { entry: join(root, 'src/agent-tools.ts'), out: join(outDir, 'agent-tools.js') },
  { entry: join(root, 'src/agent-tools-ops.ts'), out: join(outDir, 'agent-tools-ops.js') },
  { entry: join(root, 'src/agent-tools-nms.ts'), out: join(outDir, 'agent-tools-nms.js') },
  { entry: join(root, 'src/agent-tools-common.ts'), out: join(outDir, 'agent-tools-common.js') },
  { entry: join(root, 'src/agent-tools-topology.ts'), out: join(outDir, 'agent-tools-topology.js') },
  { entry: join(root, 'src/agent-tools-biz-monitor.ts'), out: join(outDir, 'agent-tools-biz-monitor.js') },
]

mkdirSync(outDir, { recursive: true })

/** Drop split-build leftovers from 0.1.56–0.1.57. */
for (const name of readdirSync(outDir)) {
  if (name === 'agent-tools-shared.js' || /^chunk-.*\.js$/.test(name)) {
    rmSync(join(outDir, name), { force: true })
  }
}
for (const name of ['_split-test', '_split-test2']) {
  const target = resolve(outDir, name)
  const within = relative(resolve(root), target)
  if (within.startsWith('..') || isAbsolute(within) || dirname(target) !== resolve(outDir)) {
    throw new Error(`Refusing cleanup outside the build directory: ${target}`)
  }
  rmSync(target, { recursive: true, force: true })
}

for (const { entry, out } of entries) {
  const result = await Bun.build({
    entrypoints: [entry],
    target: 'node',
    format: 'esm',
    sourcemap: 'none',
    minify: false,
    metafile: true,
    external,
  })

  if (!result.success) {
    console.error(result.logs)
    throw new Error(`Bun.build host failed for ${basename(entry)}`)
  }

  const text = await result.outputs[0].text()
  writeFileSync(out, text, 'utf8')
  recordBuild(out, result, 'scripts/build-host.mjs')
  console.log(`wrote ${out} (${text.length} bytes)`)
}