// ESLint flat config (ESLint 9+).
// Enforces the partition dependency map in wiki/DependencyMap.md §4.
//
// Element types (folders) and allowed importers:
//   shared : importable by every other element (no internal imports of its own).
//   engine : imports shared.
//   anchor : imports shared, engine.
//   source : imports shared, engine.
//   binder : imports shared, engine, anchor.
//   work   : imports shared, engine, anchor, source.  (NOT binder.)
//   app    : imports anything.
//
// Path aliases (@shared/*, @engine/*, etc.) come from tsconfig.json paths and
// are resolved by eslint-import-resolver-typescript.

import js from "@eslint/js";
import tseslint from "typescript-eslint";
import boundaries from "eslint-plugin-boundaries";
import importPlugin from "eslint-plugin-import";
import globals from "globals";

export default tseslint.config(
  {
    ignores: ["dist/", "node_modules/", "coverage/", "**/*.d.ts"],
  },
  js.configs.recommended,
  ...tseslint.configs.recommended,
  {
    files: ["src/**/*.{ts,tsx}"],
    languageOptions: {
      ecmaVersion: 2022,
      sourceType: "module",
      globals: { ...globals.browser, ...globals.node },
    },
    plugins: {
      boundaries,
      import: importPlugin,
    },
    settings: {
      "import/resolver": {
        typescript: { project: "./tsconfig.json" },
      },
      "boundaries/elements": [
        { type: "shared", pattern: "src/shared/**" },
        { type: "engine", pattern: "src/engine/**" },
        { type: "anchor", pattern: "src/anchor/**" },
        { type: "source", pattern: "src/source/**" },
        { type: "binder", pattern: "src/binder/**" },
        { type: "work",   pattern: "src/work/**"   },
        { type: "app",    pattern: "src/app/**"    },
      ],
    },
    rules: {
      "boundaries/element-types": [
        2,
        {
          default: "disallow",
          rules: [
            { from: "shared", allow: [] },
            { from: "engine", allow: ["shared"] },
            { from: "anchor", allow: ["shared", "engine"] },
            { from: "source", allow: ["shared", "engine"] },
            { from: "binder", allow: ["shared", "engine", "anchor"] },
            { from: "work",   allow: ["shared", "engine", "anchor", "source"] },
            { from: "app",    allow: ["shared", "engine", "anchor", "source", "binder", "work"] },
          ],
        },
      ],
    },
  },
);