'use strict';

const declarationValueIndex = require('../../utils/declarationValueIndex');
const isStandardSyntaxDeclaration = require('../../utils/isStandardSyntaxDeclaration');
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const whitespaceChecker = require('../../utils/whitespaceChecker');

const ruleName = 'declaration-colon-newline-after';

const messages = ruleMessages(ruleName, {
	expectedAfter: () => 'Expected newline after ":"',
	expectedAfterMultiLine: () => 'Expected newline after ":" with a multi-line declaration',
});

function rule(expectation, options, context) {
	const checker = whitespaceChecker('newline', expectation, messages);

	return (root, result) => {
		const validOptions = validateOptions(result, ruleName, {
			actual: expectation,
			possible: ['always', 'always-multi-line'],
		});

		if (!validOptions) {
			return;
		}

		root.walkDecls((decl) => {
			if (!isStandardSyntaxDeclaration(decl)) {
				return;
			}

			// Get the raw prop, and only the prop
			const endOfPropIndex = declarationValueIndex(decl) + (decl.raws.between || '').length - 1;

			// The extra characters tacked onto the end ensure that there is a character to check
			// after the colon. Otherwise, with `background:pink` the character after the
			const propPlusColon = `${decl.toString().slice(0, endOfPropIndex)}xxx`;

			for (let i = 0, l = propPlusColon.length; i < l; i++) {
				if (propPlusColon[i] !== ':') {
					continue;
				}

				const indexToCheck = /^[^\S\r\n]*\/\*/.test(propPlusColon.slice(i + 1))
					? propPlusColon.indexOf('*/', i) + 1
					: i;

				checker.afterOneOnly({
					source: propPlusColon,
					index: indexToCheck,
					lineCheckStr: decl.value,
					err: (m) => {
						if (context.fix) {
							const between = decl.raws.between;
							const betweenStart = declarationValueIndex(decl) - between.length;
							const sliceIndex = indexToCheck - betweenStart + 1;
							const betweenBefore = between.slice(0, sliceIndex);
							const betweenAfter = between.slice(sliceIndex);

							if (/^\s*\r?\n/.test(betweenAfter)) {
								decl.raws.between = betweenBefore + betweenAfter.replace(/^[^\S\r\n]*/, '');
							} else {
								decl.raws.between = betweenBefore + context.newline + betweenAfter;
							}

							return;
						}

						report({
							message: m,
							node: decl,
							index: indexToCheck,
							result,
							ruleName,
						});
					},
				});
			}
		});
	};
}

rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;
