/**
 * Detect the appropriate vitest `environment` for a package.
 *
 * Order of precedence:
 * 1. Explicit override
 * 2. Package depends on `react` / `react-dom` → `happy-dom`
 * 3. Package depends on `jsdom` → `jsdom`
 * 4. Default: `node`
 */

export type TestEnvironment = "node" | "happy-dom" | "jsdom";

interface MinimalPackageJson {
    dependencies?: Record<string, string>;
    devDependencies?: Record<string, string>;
    peerDependencies?: Record<string, string>;
}

export function detectEnvironment(
    pkg: MinimalPackageJson,
    override?: TestEnvironment
): TestEnvironment {
    if (override) return override;
    const deps = {
        ...(pkg.dependencies ?? {}),
        ...(pkg.devDependencies ?? {}),
        ...(pkg.peerDependencies ?? {}),
    };
    if ("react" in deps || "react-dom" in deps) return "happy-dom";
    if ("jsdom" in deps) return "jsdom";
    return "node";
}