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

import * as parse from 'parse-color';
import { Range, TextDocument, DocumentColorProvider, Color, ColorRange } from 'vscode';

const CSSColorFormats = {
	Hex: '#{red:X}{green:X}{blue:X}',
	RGB: {
		opaque: 'rgb({red:d[0-255]}, {green:d[0-255]}, {blue:d[0-255]})',
		transparent: 'rgba({red:d[0-255]}, {green:d[0-255]}, {blue:d[0-255]}, {alpha})'
	},
	HSL: {
		opaque: 'hsl({hue:d[0-360]}, {saturation:d[0-100]}%, {luminance:d[0-100]}%)',
		transparent: 'hsla({hue:d[0-360]}, {saturation:d[0-100]}%, {luminance:d[0-100]}%, {alpha})'
	}
};

export class ColorProvider implements DocumentColorProvider {
	constructor(private decoratorProvider: (uri: string) => Thenable<Range[]>, private supportedLanguages: { [id: string]: boolean }, private isDecoratorEnabled: (languageId: string) => boolean) { }

	async provideDocumentColors(document: TextDocument): Promise<ColorRange[]> {
		let renderDecorator = false;
		if (document && this.isDecoratorEnabled(document.languageId)) {
			renderDecorator = true;
		}

		const ranges = await this.decoratorProvider(document.uri.toString());
		const result = [];
		for (let range of ranges) {
			let color;
			const value = document.getText(range);
			if (value[0] === '#') {
				color = Color.fromHex(value);
			} else {
				const parsedColor = parse(value);
				if (parsedColor && parsedColor.rgba) {
					const [red, green, blue, alpha] = parsedColor.rgba;
					color = new Color(red, green, blue, alpha);
				}
			}
			if (color) {
				result.push(new ColorRange(range, color, [CSSColorFormats.Hex, CSSColorFormats.RGB, CSSColorFormats.HSL], renderDecorator));
			}
		}
		return result;
	}
}