import { defineConfig } from "vitest/config";
import react from "@vitejs/plugin-react";
import { resolve } from "node:path";
import { computeMaxWorkers } from "../core/src/__test-utils__/vitest-workers";

const maxWorkers = computeMaxWorkers({ defaultCap: 3 });

export default defineConfig({
  plugins: [react()],
  resolve: {
    alias: {
      "@fusion/core": resolve(__dirname, "../core/src/index.ts"),
      "@fusion/engine": resolve(__dirname, "../engine/src/index.ts"),
      "@fusion/plugin-sdk": resolve(__dirname, "../plugin-sdk/src/index.ts"),
      "@fusion/test-utils": resolve(__dirname, "../core/src/__test-utils__/workspace.ts"),
      "@fusion-plugin-examples/droid-runtime/probe": resolve(
        __dirname,
        "../../plugins/fusion-plugin-droid-runtime/src/probe.ts",
      ),
      "@fusion-plugin-examples/droid-runtime": resolve(
        __dirname,
        "../../plugins/fusion-plugin-droid-runtime/src/index.ts",
      ),
    },
  },
  test: {
    // `app/**` is React UI — needs jsdom + CSS. `src/**` is the Express
    // backend, mostly Node-only logic; running it in node env trims jsdom
    // env+CSS-include cost. The handful of src tests that genuinely need DOM
    // opt-in via `// @vitest-environment jsdom`.
    environment: "node",
    environmentMatchGlobs: [
      ["app/**", "jsdom"],
    ],
    // Process CSS imports only for jsdom-based tests that assert on
    // getComputedStyle. Node-env tests under src/** don't need CSS rules and
    // skipping the transform there cuts a large slice of total wall time.
    css: { include: [/app\//] },
    globals: true,
    include: ["app/**/*.test.{ts,tsx}", "src/**/*.test.{ts,tsx}"],
    setupFiles: [
      "./src/__tests__/setup-test-isolation.ts",
      resolve(__dirname, "../core/src/__test-utils__/vitest-setup.ts"),
      "./vitest.setup.ts",
    ],
    globalSetup: [resolve(__dirname, "../core/src/__test-utils__/vitest-teardown.ts")],
    // Threads share a V8 heap so they're much lighter than forks for jsdom +
    // React suites; forks duplicated the entire renderer per worker (~500MB).
    pool: "threads",
    maxWorkers,
    poolOptions: { threads: { minThreads: 1, maxThreads: maxWorkers } },
    fileParallelism: true,
    isolate: true,
    // Dashboard route and integration-heavy suites can exceed the Vitest
    // 5s default under workspace-concurrent runs.
    testTimeout: 15_000,
    hookTimeout: 15_000,
    coverage: {
      enabled: false,
      reporter: ["text", "html", "json"],
      reportsDirectory: "./coverage",
      include: ["app/**/*.{ts,tsx}", "src/**/*.{ts,tsx}"],
      exclude: ["**/*.test.{ts,tsx}", "**/*.d.ts", "dist/**"],
    },
  },
});