import {
	extractBetweenParentheses,
	isGradient,
	isKnownCssVariable,
	isLessFunction,
	isNamedColor,
	isRawColor,
} from './colors';
import { extractCssVarName } from './declaration';
import { getCssVarMeta, getNamedColorMeta, getRawColorMeta } from './meta';
import findToken from './tokens';

interface Value {
	getReplacement: (additionalMeta?: string[]) => string;
	getMeta: () => string[];
}

export default function parseValue(value: string): Value | null {
	if (isLessFunction(value)) {
		// eslint-disable-next-line no-console
		console.warn('Cannot parse - less function detected, would cause compilation error');
		return null;
	}
	if (isGradient(value)) {
		return {
			getReplacement(additionalMeta = []) {
				const gradientContent = extractBetweenParentheses(value);
				const values = gradientContent.split(',');
				const replacedValues = values.map((val) => {
					const parsedValue = parseValue(val.trim());
					return parsedValue ? parsedValue.getReplacement(additionalMeta) : val;
				});
				return value.replace(gradientContent, replacedValues.join(', '));
			},
			getMeta() {
				const BASE_META: string[] = [];
				const gradientContent = extractBetweenParentheses(value);
				const values = gradientContent.split(',');
				const metas = values.reduce((acc, val) => {
					const parsedValue = parseValue(val.trim());
					return parsedValue ? [...acc, ...parsedValue.getMeta()] : acc;
				}, BASE_META);
				return metas;
			},
		};
	}
	if (isKnownCssVariable(extractCssVarName(value))) {
		return {
			getReplacement(additionalMeta = []) {
				const token = findToken([...additionalMeta, ...this.getMeta()]);
				return `var(${token}, ${value})`;
			},
			getMeta() {
				return getCssVarMeta(value);
			},
		};
	}
	if (isRawColor(value)) {
		return {
			getReplacement(additionalMeta = []) {
				const token = findToken([...additionalMeta, ...this.getMeta()]);
				return `var(${token}, ${value})`;
			},
			getMeta() {
				return getRawColorMeta(value);
			},
		};
	}

	if (isNamedColor(value)) {
		return {
			getReplacement(additionalMeta = []) {
				const token = findToken([...additionalMeta, ...this.getMeta()]);
				return `var(${token}, ${value})`;
			},
			getMeta() {
				return getNamedColorMeta(value);
			},
		};
	}

	return null;
}