import js from '@eslint/js';
import svelte from 'eslint-plugin-svelte';
import globals from 'globals';
import ts from 'typescript-eslint';

/**
 * Lint only. Formatting is deliberately not enforced here — there is no Prettier in
 * this project, so any stylistic rule would fight the existing hand-kept style.
 *
 * Type-aware linting is on (`projectService`), which is what makes
 * `no-floating-promises` able to see that an `async` handler's promise is dropped.
 */
export default ts.config(
	js.configs.recommended,
	...ts.configs.recommendedTypeChecked,
	...svelte.configs.recommended,
	{
		languageOptions: {
			globals: { ...globals.browser },
			parserOptions: {
				projectService: true,
				extraFileExtensions: ['.svelte'],
				tsconfigRootDir: import.meta.dirname
			}
		}
	},
	{
		files: ['**/*.svelte', '**/*.svelte.ts'],
		languageOptions: {
			parserOptions: {
				parser: ts.parser
			}
		}
	},
	{
		rules: {
			// The app ships no logging of its own; `hooks.client.ts` is the one exception
			// and opts in explicitly below.
			'no-console': 'error',
			/*
			 * Off: this rule wants every href and goto() wrapped in `resolve()`, which
			 * matters only for an app served under a base path. This one is served from
			 * the root (see nginx.conf) and sets no `base`, so it would be 14 wrappers
			 * buying nothing. Revisit if the app ever moves under a sub-path.
			 */
			'svelte/no-navigation-without-resolve': 'off',
			/*
			 * The regex placeholders on the event pickers need a literal `{` in an
			 * attribute, which in Svelte can only be written as a mustache.
			 */
			'svelte/no-useless-mustaches': ['error', { ignoreStringEscape: true }],
			// This is the rule that catches an `async` function used directly as an
			// event handler, where a rejection becomes an unhandled rejection.
			'@typescript-eslint/no-floating-promises': 'error',
			'@typescript-eslint/no-unused-vars': [
				'error',
				{ argsIgnorePattern: '^_', varsIgnorePattern: '^_' }
			]
		}
	},
	{
		files: ['src/hooks.client.ts'],
		rules: { 'no-console': 'off' }
	},
	{
		// This file and the Vite config are build tooling, outside the app's tsconfig
		// project, so type-aware rules cannot resolve them.
		files: ['eslint.config.js', 'vite.config.ts'],
		...ts.configs.disableTypeChecked
	},
	{
		// Generated from openapi.json by `npm run api:types`; not ours to lint.
		ignores: [
			'src/lib/api/schema.d.ts',
			'build/',
			'.svelte-kit/',
			'node_modules/',
			'static/config.js'
		]
	}
);