/**
 * Architecture enforcement.
 *
 * The layering described in src/ports/types.js is worth nothing if it is only a
 * comment. These rules make it a build failure:
 *
 *     core/     imports nothing outside core/     (pure: no DOM, no I/O, no time)
 *     ports/    imports nothing at all            (contracts only)
 *     adapters/ may import ports/ and core/       (the impure edge)
 *     ui/       may import ports/ and core/       (rendering only)
 *     app/      may import anything               (composition root)
 *
 * The arrow never points from core/ outward. That single rule is what keeps the
 * ranker testable in Node with no browser, and it is checked on every run of
 * `npm run verify`.
 */
module.exports = {
  forbidden: [
    {
      name: 'core-stays-pure',
      severity: 'error',
      comment:
        'core/ must not import from any other layer. It is the only part of the '
        + 'system that can be reasoned about in isolation, and that property is '
        + 'load-bearing: it is why the ranking can be tested deterministically.',
      from: { path: '^src/core' },
      to: { path: '^src/(adapters|ui|app|ports)' },
    },
    {
      name: 'core-touches-no-platform',
      severity: 'error',
      comment:
        'core/ must not reach for browser or Node globals. If a ranking function '
        + 'reads the clock or storage directly it stops being reproducible.',
      from: { path: '^src/core' },
      to: { dependencyTypes: ['core', 'npm'] },
    },
    {
      name: 'ports-are-contracts-only',
      severity: 'error',
      comment: 'ports/ declares types. It must import nothing.',
      from: { path: '^src/ports' },
      to: { path: '.' },
    },
    {
      name: 'ui-does-no-io',
      severity: 'error',
      comment:
        'ui/ renders. It must not import adapters — anything that talks to the '
        + 'network, storage or the observer belongs behind the composition root.',
      from: { path: '^src/ui' },
      to: { path: '^src/(adapters|app)' },
    },
    {
      name: 'adapters-never-import-ui',
      severity: 'error',
      comment: 'The impure edge must not depend on rendering.',
      from: { path: '^src/adapters' },
      to: { path: '^src/(ui|app)' },
    },
    {
      name: 'no-cycles',
      severity: 'error',
      comment: 'A cycle means the boundaries are not real.',
      from: {},
      to: { circular: true },
    },
    {
      name: 'no-orphans',
      severity: 'warn',
      comment: 'Unreachable module — either wire it up or delete it.',
      from: { orphan: true, pathNot: ['^src/ports/types\\.js$'] },
      to: {},
    },
  ],
  options: {
    doNotFollow: { path: 'node_modules' },
    exclude: { path: '(node_modules|dist|\\.source)' },
    tsPreCompilationDeps: false,
  },
};