import prettier from 'eslint-config-prettier';
import path from 'node:path';
import js from '@eslint/js';
import svelte from 'eslint-plugin-svelte';
import { defineConfig, includeIgnoreFile } from 'eslint/config';
import globals from 'globals';
import ts from 'typescript-eslint';

const gitignorePath = path.resolve(import.meta.dirname, '.gitignore');

export default defineConfig(
	includeIgnoreFile(gitignorePath),
	js.configs.recommended,
	ts.configs.recommended,
	svelte.configs.recommended,
	prettier,
	svelte.configs.prettier,
	{
		languageOptions: { globals: { ...globals.browser, ...globals.node } },
		rules: {
			// typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
			// see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
			'no-undef': 'off'
		}
	},
	{
		files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
		languageOptions: {
			parserOptions: {
				projectService: true,
				extraFileExtensions: ['.svelte'],
				parser: ts.parser
			}
		}
	},
	{
		// Override or add rule settings here, such as:
		// 'svelte/button-has-type': 'error'
		rules: {}
	},
	// --- Package-boundary enforcement (see docs/ARCHITECTURE.md) ---
	{
		// App/project code may only reach core's server-only entries through
		// $lib/server/webavatar-core.ts; server.js and vite.config.ts are the
		// two root-only composition roots allowed to import the package directly.
		files: ['apps/template/**/*.{ts,js,svelte}'],
		ignores: [
			'apps/template/src/lib/server/**',
			'apps/template/server.js',
			'apps/template/vite.config.ts'
		],
		rules: {
			'@typescript-eslint/no-restricted-imports': [
				'error',
				{
					paths: [
						{
							name: '@webavatar/webavatar-core/server',
							message: 'Server-only — import through $lib/server/webavatar-core.js instead.'
						},
						{
							name: '@webavatar/webavatar-core/vite',
							message: 'Server-only — only server.js and vite.config.ts may import this directly.'
						}
					]
				}
			]
		}
	},
	{
		// humanoid may depend on core's public contracts only as types — never
		// on core's runtime values, and never on core's internal file layout.
		files: ['packages/humanoid/src/**/*.ts'],
		rules: {
			'@typescript-eslint/no-restricted-imports': [
				'error',
				{
					paths: [
						{
							name: '@webavatar/webavatar-core',
							allowTypeImports: true,
							message:
								'humanoid may only import core contracts as types (`import type`) — no runtime values.'
						}
					],
					patterns: [
						{
							group: ['**/core/**', '@webavatar/webavatar-core/*', '**/project/**', '**/apps/**'],
							message: 'humanoid must not import core internals, app code, or project code.'
						}
					]
				}
			]
		}
	},
	{
		// Core never imports humanoid, app, or project code, in either direction.
		files: ['packages/core/src/**/*.ts'],
		rules: {
			'@typescript-eslint/no-restricted-imports': [
				'error',
				{
					paths: [
						{ name: '@webavatar/webavatar-humanoid', message: 'core must not import humanoid.' }
					],
					patterns: [
						{
							group: [
								'**/humanoid/**',
								'@webavatar/webavatar-humanoid/*',
								'**/project/**',
								'**/apps/**'
							],
							message: 'core must not import humanoid, app, or project code.'
						}
					]
				}
			]
		}
	}
);