import { defineConfig } from 'vitest/config';
import { playwright } from '@vitest/browser-playwright';
import adapter from '@sveltejs/adapter-node';
import { sveltekit } from '@sveltejs/kit/vite';
import { DEFAULT_SESSION_DEFAULTS } from './src/lib/server/core/defaults.js';
import { realtimeDevWsPlugin } from './src/lib/server/core/dev-plugin.js';
import { toolRegistry } from './src/lib/server/project/tools/index.js';

// Composition root: merges core defaults with the project's tool registry.
// server/core never imports project code directly (see docs/TOOLS.md) — this
// is one of the two places (alongside server.js) that's allowed to.
const realtimeDefaults = { ...DEFAULT_SESSION_DEFAULTS, toolRegistry };

export default defineConfig({
	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 src/lib/server/core/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.
		realtimeDevWsPlugin({ defaults: realtimeDefaults })
	],
	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}']
				}
			}
		]
	}
});