import CSSRule from '../CSSRule.js';
import * as PropertySymbol from '../../PropertySymbol.js';
import CSSStyleRule from '../rules/CSSStyleRule.js';
import CSSKeyframeRule from '../rules/CSSKeyframeRule.js';
import CSSKeyframesRule from '../rules/CSSKeyframesRule.js';
import CSSMediaRule from '../rules/CSSMediaRule.js';
import CSSContainerRule from '../rules/CSSContainerRule.js';
import CSSSupportsRule from '../rules/CSSSupportsRule.js';
import SelectorParser from '../../query-selector/SelectorParser.js';
const COMMENT_REGEXP = /\/\*[\s\S]*?\*\//gm;
/**
 * CSS parser.
 */
export default class CSSParser {
    /**
     * Parses HTML and returns a root element.
     *
     * @param parentStyleSheet Parent style sheet.
     * @param cssText CSS code.
     * @returns Root element.
     */
    static parseFromString(parentStyleSheet, cssText) {
        const css = cssText.replace(COMMENT_REGEXP, '');
        const cssRules = [];
        const regExp = /{|}/gm;
        const stack = [];
        let parentRule = null;
        let lastIndex = 0;
        let match;
        while ((match = regExp.exec(css))) {
            if (match[0] === '{') {
                const selectorText = css.substring(lastIndex, match.index).trim();
                if (selectorText.startsWith('@keyframes') ||
                    selectorText.startsWith('@-webkit-keyframes')) {
                    const newRule = new CSSKeyframesRule();
                    newRule.name = selectorText.replace(/@(-webkit-){0,1}keyframes +/, '');
                    newRule.parentStyleSheet = parentStyleSheet;
                    cssRules.push(newRule);
                    parentRule = newRule;
                }
                else if (selectorText.startsWith('@media')) {
                    const mediums = selectorText.replace('@media', '').split(',');
                    const newRule = new CSSMediaRule();
                    for (const medium of mediums) {
                        newRule.media.appendMedium(medium.trim());
                    }
                    newRule.parentStyleSheet = parentStyleSheet;
                    cssRules.push(newRule);
                    parentRule = newRule;
                }
                else if (selectorText.startsWith('@container') ||
                    selectorText.startsWith('@-webkit-container')) {
                    const conditionText = selectorText.replace(/@(-webkit-){0,1}container +/, '');
                    const newRule = new CSSContainerRule();
                    newRule.conditionText = conditionText;
                    newRule.parentStyleSheet = parentStyleSheet;
                    cssRules.push(newRule);
                    parentRule = newRule;
                }
                else if (selectorText.startsWith('@supports') ||
                    selectorText.startsWith('@-webkit-supports')) {
                    const conditionText = selectorText.replace(/@(-webkit-){0,1}supports +/, '');
                    const newRule = new CSSSupportsRule();
                    newRule.conditionText = conditionText;
                    newRule.parentStyleSheet = parentStyleSheet;
                    cssRules.push(newRule);
                    parentRule = newRule;
                }
                else if (selectorText.startsWith('@')) {
                    // Unknown rule.
                    // We will create a new rule to let it grab its content, but we will not add it to the cssRules array.
                    const newRule = new CSSRule();
                    newRule.parentStyleSheet = parentStyleSheet;
                    parentRule = newRule;
                }
                else if (parentRule && parentRule.type === CSSRule.KEYFRAMES_RULE) {
                    const newRule = new CSSKeyframeRule();
                    newRule.keyText = selectorText.trim();
                    newRule.parentStyleSheet = parentStyleSheet;
                    newRule.parentRule = parentRule;
                    parentRule.cssRules.push(newRule);
                    parentRule = newRule;
                }
                else if (parentRule &&
                    (parentRule.type === CSSRule.MEDIA_RULE ||
                        parentRule.type === CSSRule.CONTAINER_RULE ||
                        parentRule.type === CSSRule.SUPPORTS_RULE)) {
                    if (this.validateSelectorText(selectorText)) {
                        const newRule = new CSSStyleRule();
                        newRule.selectorText = selectorText;
                        newRule.parentStyleSheet = parentStyleSheet;
                        newRule.parentRule = parentRule;
                        parentRule.cssRules.push(newRule);
                        parentRule = newRule;
                    }
                }
                else {
                    if (this.validateSelectorText(selectorText)) {
                        const newRule = new CSSStyleRule();
                        newRule.selectorText = selectorText;
                        newRule.parentStyleSheet = parentStyleSheet;
                        newRule.parentRule = parentRule;
                        if (!parentRule) {
                            cssRules.push(newRule);
                        }
                        parentRule = newRule;
                    }
                }
                stack.push(parentRule);
            }
            else {
                if (parentRule) {
                    const cssText = css
                        .substring(lastIndex, match.index)
                        .trim()
                        .replace(/([^;])$/, '$1;'); // Ensure last semicolon
                    switch (parentRule.type) {
                        case CSSRule.FONT_FACE_RULE:
                        case CSSRule.KEYFRAME_RULE:
                        case CSSRule.STYLE_RULE:
                            parentRule[PropertySymbol.cssText] = cssText;
                            break;
                    }
                }
                stack.pop();
                parentRule = stack[stack.length - 1] || null;
            }
            lastIndex = match.index + 1;
        }
        return cssRules;
    }
    /**
     * Validates a selector text.
     *
     * @see https://www.w3.org/TR/CSS21/syndata.html#rule-sets
     * @param selectorText Selector text.
     * @returns True if valid, false otherwise.
     */
    static validateSelectorText(selectorText) {
        try {
            SelectorParser.getSelectorGroups(selectorText);
        }
        catch (e) {
            return false;
        }
        return true;
    }
}
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