// Shared flat ESLint config — the mechanical enforcement of the project's
// non-negotiable code-quality standards. Each package's eslint.config.mjs
// imports `base` from here and appends its own architecture-boundary rules.
//
// Enforced here (build fails on violation):
//   - no `any`             (@typescript-eslint/no-explicit-any + no-unsafe-*)
//   - no type assertions   (consistent-type-assertions: never  → bans `x as T`)
//   - no non-null `!`      (no-non-null-assertion)
//   - no dead optional `?.`(no-unnecessary-condition)
//   - functional iteration (prefer-const, no-param-reassign, no-var)
//   - no suppressions      (ban-ts-comment)
//   - safe promises        (no-floating-promises, await-thenable)

import js from '@eslint/js';
import tseslint from 'typescript-eslint';
import prettier from 'eslint-config-prettier';
import globals from 'globals';

export const base = tseslint.config(
  {
    ignores: ['**/dist/**', '**/build/**', '**/.expo/**', '**/coverage/**', '**/*.d.ts'],
  },
  js.configs.recommended,
  ...tseslint.configs.strictTypeChecked,
  ...tseslint.configs.stylisticTypeChecked,
  {
    languageOptions: {
      parserOptions: {
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
      globals: {
        ...globals.node,
      },
    },
    rules: {
      // --- no any ---
      '@typescript-eslint/no-explicit-any': 'error',
      '@typescript-eslint/no-unsafe-assignment': 'error',
      '@typescript-eslint/no-unsafe-call': 'error',
      '@typescript-eslint/no-unsafe-member-access': 'error',
      '@typescript-eslint/no-unsafe-return': 'error',
      '@typescript-eslint/no-unsafe-argument': 'error',

      // --- no type assertions (bans `x as T`; `as const` still allowed) ---
      '@typescript-eslint/consistent-type-assertions': [
        'error',
        { assertionStyle: 'never' },
      ],

      // --- no non-null assertions ---
      '@typescript-eslint/no-non-null-assertion': 'error',

      // --- no error-silencing optional chaining / dead conditions ---
      '@typescript-eslint/no-unnecessary-condition': 'error',

      // --- functional / immutable iteration; no spaghetti ---
      'prefer-const': 'error',
      'no-param-reassign': 'error',
      'no-var': 'error',
      'object-shorthand': 'error',

      // --- no suppressions ---
      '@typescript-eslint/ban-ts-comment': 'error',

      // --- safe async ---
      '@typescript-eslint/no-floating-promises': 'error',
      '@typescript-eslint/await-thenable': 'error',

      // --- hygiene ---
      '@typescript-eslint/no-unused-vars': [
        'error',
        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
      ],
      '@typescript-eslint/consistent-type-imports': 'error',
    },
  },
  {
    // Config files themselves run outside the typed project graph.
    files: ['**/*.config.{js,mjs,cjs,ts}', '**/*.setup.{js,mjs,cjs,ts}'],
    ...tseslint.configs.disableTypeChecked,
  },
  prettier,
);

export default base;