import eslintJs from '@eslint/js';
import tseslint from 'typescript-eslint';
import solid from 'eslint-plugin-solid';
import type { ConfigWithExtends } from 'typescript-eslint';
import prettier from 'eslint-plugin-prettier/recommended';

// tseslint.config() is the correct entry point for this version of typescript-eslint.
// ESLint's own defineConfig() is not compatible with typescript-eslint's typed config
// spreads yet (type mismatch between @typescript-eslint/utils and @eslint/core internals).
// eslint-disable-next-line @typescript-eslint/no-deprecated
export default tseslint.config(
  // Base JS recommended rules
  eslintJs.configs.recommended,

  // TypeScript strict + stylistic best-practice rules
  ...tseslint.configs.strictTypeChecked,
  ...tseslint.configs.stylisticTypeChecked,

  // Solid.js TypeScript rules
  // Cast required: eslint-plugin-solid uses older RuleModule types than ESLint core
  solid.configs['flat/typescript'] as ConfigWithExtends,

  // Prettier: disables formatting rules that conflict, then enforces prettier
  prettier,

  // Project-wide settings
  {
    languageOptions: {
      parserOptions: {
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },

  // Custom rule overrides
  {
    rules: {
      // Treat deprecated APIs as errors
      '@typescript-eslint/no-deprecated': 'error',

      // Best-practice TypeScript rules
      '@typescript-eslint/no-explicit-any': 'error',
      '@typescript-eslint/consistent-type-imports': [
        'error',
        { prefer: 'type-imports', fixStyle: 'separate-type-imports' },
      ],
      '@typescript-eslint/no-unused-vars': [
        'error',
        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
      ],
      'no-console': 'error',
      eqeqeq: ['error', 'always'],
      'no-var': 'error',
      'prefer-const': 'error',

      // Prettier formatting as errors
      'prettier/prettier': 'error',
    },
  },

  // Ignore build artifacts and dependencies
  {
    ignores: ['node_modules/**'],
  },
);