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

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

const EMPTY_ELEMENTS: string[] = [
	'area',
	'base',
	'br',
	'col',
	'embed',
	'hr',
	'img',
	'input',
	'keygen',
	'link',
	'menuitem',
	'meta',
	'param',
	'source',
	'track',
	'wbr'
];

export const conf: languages.LanguageConfiguration = {
	wordPattern: /(-?\d*\.\d\w*)|([^\`\~\!\@\$\^\&\*\(\)\=\+\[\{\]\}\\\|\;\:\'\"\,\.\<\>\/\s]+)/g,

	comments: {
		blockComment: ['{{!--', '--}}']
	},

	brackets: [
		['<!--', '-->'],
		['<', '>'],
		['{{', '}}'],
		['{', '}'],
		['(', ')']
	],

	autoClosingPairs: [
		{ open: '{', close: '}' },
		{ open: '[', close: ']' },
		{ open: '(', close: ')' },
		{ open: '"', close: '"' },
		{ open: "'", close: "'" }
	],

	surroundingPairs: [
		{ open: '<', close: '>' },
		{ open: '"', close: '"' },
		{ open: "'", close: "'" }
	],

	onEnterRules: [
		{
			beforeText: new RegExp(
				`<(?!(?:${EMPTY_ELEMENTS.join('|')}))(\\w[\\w\\d]*)([^/>]*(?!/)>)[^<]*$`,
				'i'
			),
			afterText: /^<\/(\w[\w\d]*)\s*>$/i,
			action: {
				indentAction: languages.IndentAction.IndentOutdent
			}
		},
		{
			beforeText: new RegExp(
				`<(?!(?:${EMPTY_ELEMENTS.join('|')}))(\\w[\\w\\d]*)([^/>]*(?!/)>)[^<]*$`,
				'i'
			),
			action: { indentAction: languages.IndentAction.Indent }
		}
	]
};

export const language = <languages.IMonarchLanguage>{
	defaultToken: '',
	tokenPostfix: '',
	// ignoreCase: true,

	// The main tokenizer for our languages
	tokenizer: {
		root: [
			[/\{\{!--/, 'comment.block.start.handlebars', '@commentBlock'],
			[/\{\{!/, 'comment.start.handlebars', '@comment'],
			[/\{\{/, { token: '@rematch', switchTo: '@handlebarsInSimpleState.root' }],
			[/<!DOCTYPE/, 'metatag.html', '@doctype'],
			[/<!--/, 'comment.html', '@commentHtml'],
			[/(<)(\w+)(\/>)/, ['delimiter.html', 'tag.html', 'delimiter.html']],
			[/(<)(script)/, ['delimiter.html', { token: 'tag.html', next: '@script' }]],
			[/(<)(style)/, ['delimiter.html', { token: 'tag.html', next: '@style' }]],
			[/(<)([:\w]+)/, ['delimiter.html', { token: 'tag.html', next: '@otherTag' }]],
			[/(<\/)(\w+)/, ['delimiter.html', { token: 'tag.html', next: '@otherTag' }]],
			[/</, 'delimiter.html'],
			[/\{/, 'delimiter.html'],
			[/[^<{]+/] // text
		],

		doctype: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.comment'
				}
			],
			[/[^>]+/, 'metatag.content.html'],
			[/>/, 'metatag.html', '@pop']
		],

		comment: [
			[/\}\}/, 'comment.end.handlebars', '@pop'],
			[/./, 'comment.content.handlebars']
		],

		commentBlock: [
			[/--\}\}/, 'comment.block.end.handlebars', '@pop'],
			[/./, 'comment.content.handlebars']
		],

		commentHtml: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.comment'
				}
			],
			[/-->/, 'comment.html', '@pop'],
			[/[^-]+/, 'comment.content.html'],
			[/./, 'comment.content.html']
		],

		otherTag: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.otherTag'
				}
			],
			[/\/?>/, 'delimiter.html', '@pop'],
			[/"([^"]*)"/, 'attribute.value'],
			[/'([^']*)'/, 'attribute.value'],
			[/[\w\-]+/, 'attribute.name'],
			[/=/, 'delimiter'],
			[/[ \t\r\n]+/] // whitespace
		],

		// -- BEGIN <script> tags handling

		// After <script
		script: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.script'
				}
			],
			[/type/, 'attribute.name', '@scriptAfterType'],
			[/"([^"]*)"/, 'attribute.value'],
			[/'([^']*)'/, 'attribute.value'],
			[/[\w\-]+/, 'attribute.name'],
			[/=/, 'delimiter'],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@scriptEmbedded.text/javascript',
					nextEmbedded: 'text/javascript'
				}
			],
			[/[ \t\r\n]+/], // whitespace
			[
				/(<\/)(script\s*)(>)/,
				['delimiter.html', 'tag.html', { token: 'delimiter.html', next: '@pop' }]
			]
		],

		// After <script ... type
		scriptAfterType: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.scriptAfterType'
				}
			],
			[/=/, 'delimiter', '@scriptAfterTypeEquals'],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@scriptEmbedded.text/javascript',
					nextEmbedded: 'text/javascript'
				}
			], // cover invalid e.g. <script type>
			[/[ \t\r\n]+/], // whitespace
			[/<\/script\s*>/, { token: '@rematch', next: '@pop' }]
		],

		// After <script ... type =
		scriptAfterTypeEquals: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.scriptAfterTypeEquals'
				}
			],
			[
				/"([^"]*)"/,
				{
					token: 'attribute.value',
					switchTo: '@scriptWithCustomType.$1'
				}
			],
			[
				/'([^']*)'/,
				{
					token: 'attribute.value',
					switchTo: '@scriptWithCustomType.$1'
				}
			],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@scriptEmbedded.text/javascript',
					nextEmbedded: 'text/javascript'
				}
			], // cover invalid e.g. <script type=>
			[/[ \t\r\n]+/], // whitespace
			[/<\/script\s*>/, { token: '@rematch', next: '@pop' }]
		],

		// After <script ... type = $S2
		scriptWithCustomType: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.scriptWithCustomType.$S2'
				}
			],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@scriptEmbedded.$S2',
					nextEmbedded: '$S2'
				}
			],
			[/"([^"]*)"/, 'attribute.value'],
			[/'([^']*)'/, 'attribute.value'],
			[/[\w\-]+/, 'attribute.name'],
			[/=/, 'delimiter'],
			[/[ \t\r\n]+/], // whitespace
			[/<\/script\s*>/, { token: '@rematch', next: '@pop' }]
		],

		scriptEmbedded: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInEmbeddedState.scriptEmbedded.$S2',
					nextEmbedded: '@pop'
				}
			],
			[/<\/script/, { token: '@rematch', next: '@pop', nextEmbedded: '@pop' }]
		],

		// -- END <script> tags handling

		// -- BEGIN <style> tags handling

		// After <style
		style: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.style'
				}
			],
			[/type/, 'attribute.name', '@styleAfterType'],
			[/"([^"]*)"/, 'attribute.value'],
			[/'([^']*)'/, 'attribute.value'],
			[/[\w\-]+/, 'attribute.name'],
			[/=/, 'delimiter'],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@styleEmbedded.text/css',
					nextEmbedded: 'text/css'
				}
			],
			[/[ \t\r\n]+/], // whitespace
			[
				/(<\/)(style\s*)(>)/,
				['delimiter.html', 'tag.html', { token: 'delimiter.html', next: '@pop' }]
			]
		],

		// After <style ... type
		styleAfterType: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.styleAfterType'
				}
			],
			[/=/, 'delimiter', '@styleAfterTypeEquals'],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@styleEmbedded.text/css',
					nextEmbedded: 'text/css'
				}
			], // cover invalid e.g. <style type>
			[/[ \t\r\n]+/], // whitespace
			[/<\/style\s*>/, { token: '@rematch', next: '@pop' }]
		],

		// After <style ... type =
		styleAfterTypeEquals: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.styleAfterTypeEquals'
				}
			],
			[
				/"([^"]*)"/,
				{
					token: 'attribute.value',
					switchTo: '@styleWithCustomType.$1'
				}
			],
			[
				/'([^']*)'/,
				{
					token: 'attribute.value',
					switchTo: '@styleWithCustomType.$1'
				}
			],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@styleEmbedded.text/css',
					nextEmbedded: 'text/css'
				}
			], // cover invalid e.g. <style type=>
			[/[ \t\r\n]+/], // whitespace
			[/<\/style\s*>/, { token: '@rematch', next: '@pop' }]
		],

		// After <style ... type = $S2
		styleWithCustomType: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInSimpleState.styleWithCustomType.$S2'
				}
			],
			[
				/>/,
				{
					token: 'delimiter.html',
					next: '@styleEmbedded.$S2',
					nextEmbedded: '$S2'
				}
			],
			[/"([^"]*)"/, 'attribute.value'],
			[/'([^']*)'/, 'attribute.value'],
			[/[\w\-]+/, 'attribute.name'],
			[/=/, 'delimiter'],
			[/[ \t\r\n]+/], // whitespace
			[/<\/style\s*>/, { token: '@rematch', next: '@pop' }]
		],

		styleEmbedded: [
			[
				/\{\{/,
				{
					token: '@rematch',
					switchTo: '@handlebarsInEmbeddedState.styleEmbedded.$S2',
					nextEmbedded: '@pop'
				}
			],
			[/<\/style/, { token: '@rematch', next: '@pop', nextEmbedded: '@pop' }]
		],

		// -- END <style> tags handling

		handlebarsInSimpleState: [
			[/\{\{\{?/, 'delimiter.handlebars'],
			[/\}\}\}?/, { token: 'delimiter.handlebars', switchTo: '@$S2.$S3' }],
			{ include: 'handlebarsRoot' }
		],

		handlebarsInEmbeddedState: [
			[/\{\{\{?/, 'delimiter.handlebars'],
			[
				/\}\}\}?/,
				{
					token: 'delimiter.handlebars',
					switchTo: '@$S2.$S3',
					nextEmbedded: '$S3'
				}
			],
			{ include: 'handlebarsRoot' }
		],

		handlebarsRoot: [
			[/"[^"]*"/, 'string.handlebars'],
			[/[#/][^\s}]+/, 'keyword.helper.handlebars'],
			[/else\b/, 'keyword.helper.handlebars'],
			[/[\s]+/],
			[/[^}]/, 'variable.parameter.handlebars']
		]
	}
};