import { describe, it, expect } from 'vitest';
import { readFileSync } from 'node:fs';
import { join } from 'node:path';
import { PI_EXTENSION_FILES, PI_EXTENSION_FILENAMES } from '../../src/config/pi-extension.js';

/**
 * `mcpctl config pi` installs the *embedded* copy of the extension, not the
 * files in src/pi-ext/. Editing the sources without re-running the generator
 * therefore ships stale code to users while the repo looks correct — and the
 * embedded copy is the one thing no typecheck covers. Same guarantee the
 * completions check gives.
 */
const repoRoot = join(import.meta.dirname, '..', '..', '..', '..');
const piExtDir = join(repoRoot, 'src', 'pi-ext');

describe('embedded pi extension', () => {
  it('matches the sources in src/pi-ext (re-run scripts/generate-pi-extension.ts)', () => {
    for (const name of PI_EXTENSION_FILENAMES) {
      const onDisk = readFileSync(join(piExtDir, name), 'utf-8');
      expect(PI_EXTENSION_FILES[name], `${name} is embedded`).toBeDefined();
      expect(PI_EXTENSION_FILES[name], `${name} is stale — regenerate the embed`).toBe(onDisk);
    }
  });

  it('embeds every file the extension needs to load', () => {
    // mcpctl-pi.ts imports ./mcp-http.js — installing one without the other
    // yields an extension pi cannot load.
    expect(Object.keys(PI_EXTENSION_FILES).sort()).toEqual(['mcp-http.ts', 'mcpctl-pi.ts']);
    expect(PI_EXTENSION_FILES['mcpctl-pi.ts']).toContain('./mcp-http.js');
  });

  /**
   * pi resolves an extension's bare specifiers through a hard-coded alias table
   * in its own loader, and that table is not the same across pi distributions:
   * `@earendil-works/*` exists only in the newer packages, `@mariozechner/*`
   * installs alias only the old names, and neither resolves the other. An
   * import of a package outside the intersection makes the whole extension fail
   * to load with `Cannot find module` — every tool gone, on someone else's pi.
   *
   * `typebox` is aliased by every published pi, so it is the only safe bare
   * runtime import. Type-only imports are erased before jiti resolves anything,
   * so they may name whatever they like.
   */
  it('imports nothing at runtime that some pi build cannot resolve', () => {
    // `import x from "s"` / `import {..} from "s"` (but not `import type`),
    // plus the side-effect form `import "s"`.
    const runtimeImport =
      /^\s*import\s+(?!type\s)[^;]*?from\s*["']([^"']+)["']|^\s*import\s*["']([^"']+)["']/gm;
    const allowed = /^(node:|\.\/|\.\.\/|typebox$|typebox\/)/;

    for (const name of PI_EXTENSION_FILENAMES) {
      const src = PI_EXTENSION_FILES[name] ?? '';
      for (const match of src.matchAll(runtimeImport)) {
        const specifier = match[1] ?? match[2] ?? '';
        expect(specifier, `${name} runtime-imports ${specifier}`).toMatch(allowed);
      }
    }
  });

  it('carries the fixes the pi API requires', () => {
    const main = PI_EXTENSION_FILES['mcpctl-pi.ts'] ?? '';
    // ctx.ui.select takes string[] and returns the chosen string.
    expect(main).not.toMatch(/select\([^)]*\[\s*\{\s*value:/);
    // Skills must land in pi's tree, never ~/.claude: the sync passes
    // --agent pi and no longer tells the user it wrote to Claude's tree.
    expect(main).toContain('"--agent", "pi"');
    expect(main).not.toContain('(into ~/.claude/skills)');
    // Spawned without a shell, so the project name is never interpolated into
    // a command string. Matches the call, not prose mentioning it.
    expect(main).toContain('execFile("mcpctl", args');
    expect(main).not.toMatch(/execSync\s*\(/);
  });
});