import { copyFileSync } from 'node:fs'
import { build } from 'esbuild'

const watch = process.argv.includes('--watch')

// Optional build-time default server origin (pre-release shares pointed at a
// non-prod environment): SIM_DESKTOP_DEFAULT_ORIGIN=https://www.dev.sim.ai.
// Baked into the bundle so it applies to fresh installs with no settings —
// unlike the SIM_DESKTOP_ORIGIN env var, which only affects terminal-launched
// processes. Official builds leave it unset (default https://www.sim.ai).
const bakedDefaultOrigin = process.env.SIM_DESKTOP_DEFAULT_ORIGIN ?? ''
if (
  bakedDefaultOrigin &&
  !/^https:\/\/[^\s/]+$/.test(bakedDefaultOrigin) &&
  !/^http:\/\/(localhost|127\.0\.0\.1)(:\d+)?$/.test(bakedDefaultOrigin)
) {
  console.error(
    `SIM_DESKTOP_DEFAULT_ORIGIN must be a bare https origin or http://localhost (got "${bakedDefaultOrigin}")`
  )
  process.exit(1)
}
if (bakedDefaultOrigin) {
  console.log(`• Baking default server origin: ${bakedDefaultOrigin}`)
}

/** Selects the branded app icon that matches the build's baked environment. */
function iconForOrigin(origin: string): string {
  if (!origin) return 'build/icon.icns'
  const host = new URL(origin).hostname.toLowerCase()
  if (host === 'localhost' || host === '127.0.0.1') return 'build/icon-local.icns'
  if (host === 'dev.sim.ai' || host.endsWith('.dev.sim.ai')) return 'build/icon-dev.icns'
  if (host === 'staging.sim.ai' || host.endsWith('.staging.sim.ai')) {
    return 'build/icon-staging.icns'
  }
  return 'build/icon.icns'
}

const appIcon = iconForOrigin(bakedDefaultOrigin)
copyFileSync(appIcon, 'build/generated-icon.icns')
console.log(`• Selecting desktop icon: ${appIcon}`)

const common = {
  bundle: true,
  platform: 'node' as const,
  format: 'cjs' as const,
  target: 'node22',
  sourcemap: true,
  // node-pty resolves a prebuilt .node binary at runtime, so it must stay
  // external and be loaded from node_modules rather than inlined here.
  external: ['electron', '@lydell/node-pty'],
  tsconfig: 'tsconfig.json',
  logLevel: 'info' as const,
  define: {
    'process.env.SIM_DESKTOP_DEFAULT_ORIGIN': JSON.stringify(bakedDefaultOrigin),
  },
}

async function run(): Promise<void> {
  if (watch) {
    const { context } = await import('esbuild')
    const mainCtx = await context({
      ...common,
      entryPoints: ['src/main/index.ts'],
      outfile: 'dist/main.cjs',
    })
    const preloadCtx = await context({
      ...common,
      entryPoints: ['src/preload/index.ts'],
      outfile: 'dist/preload.cjs',
    })
    // Separate from the main-window preload: this one is injected into
    // untrusted pages in the built-in browser and must stay minimal.
    const browserPreloadCtx = await context({
      ...common,
      entryPoints: ['src/preload/browser/index.ts'],
      outfile: 'dist/browser-preload.cjs',
    })
    await Promise.all([mainCtx.watch(), preloadCtx.watch(), browserPreloadCtx.watch()])
    return
  }
  await Promise.all([
    build({ ...common, entryPoints: ['src/main/index.ts'], outfile: 'dist/main.cjs' }),
    build({ ...common, entryPoints: ['src/preload/index.ts'], outfile: 'dist/preload.cjs' }),
    build({
      ...common,
      entryPoints: ['src/preload/browser/index.ts'],
      outfile: 'dist/browser-preload.cjs',
    }),
  ])
}

run().catch((error) => {
  console.error(error)
  process.exit(1)
})