/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import type { languages } from '../../fillers/monaco-editor-core';

export const conf: languages.LanguageConfiguration = {
	comments: {
		lineComment: '//',
		blockComment: ['/*', '*/']
	},
	brackets: [
		['{', '}'],
		['[', ']'],
		['(', ')']
	],
	autoClosingPairs: [
		{ open: '{', close: '}' },
		{ open: '[', close: ']' },
		{ open: '(', close: ')' },
		{ open: "'", close: "'", notIn: ['string', 'comment'] },
		{ open: '"', close: '"', notIn: ['string'] },
		{ open: '`', close: '`', notIn: ['string', 'comment'] },
		{ open: '/**', close: ' */', notIn: ['string'] }
	],
	surroundingPairs: [
		{ open: '{', close: '}' },
		{ open: '[', close: ']' },
		{ open: '(', close: ')' },

		{ open: '<', close: '>' },
		{ open: "'", close: "'" },
		{ open: '(', close: ')' },
		{ open: '"', close: '"' },
		{ open: '`', close: '`' }
	],
	folding: {
		markers: {
			start: /^\s*\s*#?region\b/,
			end: /^\s*\s*#?endregion\b/
		}
	}
};

export const language = <languages.IMonarchLanguage>{
	defaultToken: 'invalid',
	tokenPostfix: '.dart',

	keywords: [
		'abstract',
		'dynamic',
		'implements',
		'show',
		'as',
		'else',
		'import',
		'static',
		'assert',
		'enum',
		'in',
		'super',
		'async',
		'export',
		'interface',
		'switch',
		'await',
		'extends',
		'is',
		'sync',
		'break',
		'external',
		'library',
		'this',
		'case',
		'factory',
		'mixin',
		'throw',
		'catch',
		'false',
		'new',
		'true',
		'class',
		'final',
		'null',
		'try',
		'const',
		'finally',
		'on',
		'typedef',
		'continue',
		'for',
		'operator',
		'var',
		'covariant',
		'Function',
		'part',
		'void',
		'default',
		'get',
		'rethrow',
		'while',
		'deferred',
		'hide',
		'return',
		'with',
		'do',
		'if',
		'set',
		'yield'
	],
	typeKeywords: ['int', 'double', 'String', 'bool'],

	operators: [
		'+',
		'-',
		'*',
		'/',
		'~/',
		'%',
		'++',
		'--',
		'==',
		'!=',
		'>',
		'<',
		'>=',
		'<=',
		'=',
		'-=',
		'/=',
		'%=',
		'>>=',
		'^=',
		'+=',
		'*=',
		'~/=',
		'<<=',
		'&=',
		'!=',
		'||',
		'&&',
		'&',
		'|',
		'^',
		'~',
		'<<',
		'>>',
		'!',
		'>>>',
		'??',
		'?',
		':',
		'|='
	],

	// we include these common regular expressions
	symbols: /[=><!~?:&|+\-*\/\^%]+/,
	escapes: /\\(?:[abfnrtv\\"']|x[0-9A-Fa-f]{1,4}|u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8})/,
	digits: /\d+(_+\d+)*/,
	octaldigits: /[0-7]+(_+[0-7]+)*/,
	binarydigits: /[0-1]+(_+[0-1]+)*/,
	hexdigits: /[[0-9a-fA-F]+(_+[0-9a-fA-F]+)*/,

	regexpctl: /[(){}\[\]\$\^|\-*+?\.]/,
	regexpesc: /\\(?:[bBdDfnrstvwWn0\\\/]|@regexpctl|c[A-Z]|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4})/,

	// The main tokenizer for our languages
	tokenizer: {
		root: [[/[{}]/, 'delimiter.bracket'], { include: 'common' }],

		common: [
			// identifiers and keywords
			[
				/[a-z_$][\w$]*/,
				{
					cases: {
						'@typeKeywords': 'type.identifier',
						'@keywords': 'keyword',
						'@default': 'identifier'
					}
				}
			],
			[/[A-Z_$][\w\$]*/, 'type.identifier'], // show class names
			// [/[A-Z][\w\$]*/, 'identifier'],

			// whitespace
			{ include: '@whitespace' },

			// regular expression: ensure it is terminated before beginning (otherwise it is an opeator)
			[
				/\/(?=([^\\\/]|\\.)+\/([gimsuy]*)(\s*)(\.|;|,|\)|\]|\}|$))/,
				{ token: 'regexp', bracket: '@open', next: '@regexp' }
			],

			// @ annotations.
			[/@[a-zA-Z]+/, 'annotation'],
			// variable

			// delimiters and operators
			[/[()\[\]]/, '@brackets'],
			[/[<>](?!@symbols)/, '@brackets'],
			[/!(?=([^=]|$))/, 'delimiter'],
			[
				/@symbols/,
				{
					cases: {
						'@operators': 'delimiter',
						'@default': ''
					}
				}
			],

			// numbers
			[/(@digits)[eE]([\-+]?(@digits))?/, 'number.float'],
			[/(@digits)\.(@digits)([eE][\-+]?(@digits))?/, 'number.float'],
			[/0[xX](@hexdigits)n?/, 'number.hex'],
			[/0[oO]?(@octaldigits)n?/, 'number.octal'],
			[/0[bB](@binarydigits)n?/, 'number.binary'],
			[/(@digits)n?/, 'number'],

			// delimiter: after number because of .\d floats
			[/[;,.]/, 'delimiter'],

			// strings
			[/"([^"\\]|\\.)*$/, 'string.invalid'], // non-teminated string
			[/'([^'\\]|\\.)*$/, 'string.invalid'], // non-teminated string
			[/"/, 'string', '@string_double'],
			[/'/, 'string', '@string_single']

			//   [/[a-zA-Z]+/, "variable"]
		],

		whitespace: [
			[/[ \t\r\n]+/, ''],
			[/\/\*\*(?!\/)/, 'comment.doc', '@jsdoc'],
			[/\/\*/, 'comment', '@comment'],
			[/\/\/\/.*$/, 'comment.doc'],
			[/\/\/.*$/, 'comment']
		],

		comment: [
			[/[^\/*]+/, 'comment'],
			[/\*\//, 'comment', '@pop'],
			[/[\/*]/, 'comment']
		],

		jsdoc: [
			[/[^\/*]+/, 'comment.doc'],
			[/\*\//, 'comment.doc', '@pop'],
			[/[\/*]/, 'comment.doc']
		],

		// We match regular expression quite precisely
		regexp: [
			[
				/(\{)(\d+(?:,\d*)?)(\})/,
				['regexp.escape.control', 'regexp.escape.control', 'regexp.escape.control']
			],
			[
				/(\[)(\^?)(?=(?:[^\]\\\/]|\\.)+)/,
				['regexp.escape.control', { token: 'regexp.escape.control', next: '@regexrange' }]
			],
			[/(\()(\?:|\?=|\?!)/, ['regexp.escape.control', 'regexp.escape.control']],
			[/[()]/, 'regexp.escape.control'],
			[/@regexpctl/, 'regexp.escape.control'],
			[/[^\\\/]/, 'regexp'],
			[/@regexpesc/, 'regexp.escape'],
			[/\\\./, 'regexp.invalid'],
			[/(\/)([gimsuy]*)/, [{ token: 'regexp', bracket: '@close', next: '@pop' }, 'keyword.other']]
		],

		regexrange: [
			[/-/, 'regexp.escape.control'],
			[/\^/, 'regexp.invalid'],
			[/@regexpesc/, 'regexp.escape'],
			[/[^\]]/, 'regexp'],
			[
				/\]/,
				{
					token: 'regexp.escape.control',
					next: '@pop',
					bracket: '@close'
				}
			]
		],

		string_double: [
			[/[^\\"\$]+/, 'string'],
			[/[^\\"]+/, 'string'],
			[/@escapes/, 'string.escape'],
			[/\\./, 'string.escape.invalid'],
			[/"/, 'string', '@pop'],
			[/\$\w+/, 'identifier']
		],

		string_single: [
			[/[^\\'\$]+/, 'string'],
			[/@escapes/, 'string.escape'],
			[/\\./, 'string.escape.invalid'],
			[/'/, 'string', '@pop'],
			[/\$\w+/, 'identifier']
		]
	}
};