import { defineConfig } from 'vitest/config';
import { playwright } from '@vitest/browser-playwright';
import adapter from '@sveltejs/adapter-node';
import { sveltekit } from '@sveltejs/kit/vite';
import { realtimeDevWsPlugin } from '@webavatar/webavatar-core/vite';
import { toolRegistry } from './src/lib/server/project/tools/index.js';
import { SESSION_PERSONA } from './src/lib/project/persona.js';
import { serverOnlyGuard } from './server-only-guard.js';

export default defineConfig(({ command }) => ({
	plugins: [
		sveltekit({
			compilerOptions: {
				// Force runes mode for the project, except for libraries. Can be removed in svelte 6.
				runes: ({ filename }) =>
					filename.split(/[/\\]/).includes('node_modules') ? undefined : true
			},

			// adapter-node: the realtime WS relay needs a persistent Node process
			// (see @webavatar/webavatar-core's server/ws-handler.ts) — no
			// serverless adapter can hold an upgraded WebSocket connection the
			// way this can.
			adapter: adapter()
		}),
		// Attaches the same WS upgrade handling used in production (server.js)
		// to Vite's dev server, so `npm run dev` supports it without a build.
		// Passes only raw, env-independent pieces (persona + tool registry) —
		// NOT a fully-resolved `defaults` object — because this plugin's config
		// gets evaluated under `npm run test:unit` too (see the VITEST guard in
		// @webavatar/webavatar-core/vite's configureServer); resolving
		// env-driven config here at module scope would run it there as well,
		// with no env vars available.
		realtimeDevWsPlugin({ persona: SESSION_PERSONA, toolRegistry }),
		serverOnlyGuard()
	],
	// Verified against the installed Vite: for SSR, Vite externalizes a
	// dependency only if it resolves inside `node_modules` — a workspace
	// package is a symlink whose real path is `packages/core/...`, so without
	// this the monorepo would bundle core's server code into the SvelteKit
	// server build while a client project that installed the published
	// package gets it externalized, running a different artifact than this
	// template does. Deliberately not applied in `dev`: externalizing would
	// load the package through Node's module cache, losing hot reload of
	// package changes for SSR routes during development. See
	// docs/ARCHITECTURE.md's "Artifact parity" section.
	ssr:
		command === 'build'
			? { external: ['@webavatar/webavatar-core', '@webavatar/webavatar-humanoid'] }
			: undefined,
	// three/addons/* (GLTFLoader, OrbitControls — see the eye-demo Three.js
	// viewer) are deep imports Vite's dependency scanner doesn't always
	// discover on its own; without this, dev mode can end up serving two
	// separate module instances of `three` (one pre-bundled, one not) and
	// warns "Multiple instances of Three.js being imported". Doesn't affect
	// the production build, which Rollup already dedupes correctly.
	optimizeDeps: {
		include: [
			'three',
			'three/addons/loaders/GLTFLoader.js',
			'three/addons/controls/OrbitControls.js'
		]
	},
	test: {
		expect: { requireAssertions: true },
		projects: [
			{
				extends: './vite.config.ts',
				test: {
					name: 'client',
					browser: {
						enabled: true,
						provider: playwright(),
						instances: [{ browser: 'chromium', headless: true }]
					},
					include: ['src/**/*.svelte.{test,spec}.{js,ts}'],
					exclude: ['src/lib/server/**']
				}
			},

			{
				extends: './vite.config.ts',
				test: {
					name: 'server',
					environment: 'node',
					include: ['src/**/*.{test,spec}.{js,ts}'],
					exclude: ['src/**/*.svelte.{test,spec}.{js,ts}']
				}
			}
		]
	}
}));