import SelectorItem from './SelectorItem.js';
import SelectorCombinatorEnum from './SelectorCombinatorEnum.js';
import DOMException from '../exception/DOMException.js';
/**
 * Selector RegExp.
 *
 * Group 1: All (e.g. "*")
 * Group 2: Tag name (e.g. "div")
 * Group 3: ID (e.g. "#id")
 * Group 4: Class (e.g. ".class")
 * Group 5: Attribute name when no value (e.g. "attr1")
 * Group 6: Attribute name when there is a value using apostrophe (e.g. "attr1")
 * Group 7: Attribute operator when using apostrophe (e.g. "~")
 * Group 8: Attribute value when using apostrophe (e.g. "value1")
 * Group 9: Attribute modifier when using apostrophe (e.g. "i" or "s")
 * Group 10: Attribute name when threre is a value not using apostrophe (e.g. "attr1")
 * Group 11: Attribute operator when not using apostrophe (e.g. "~")
 * Group 12: Attribute value when notusing apostrophe (e.g. "value1")
 * Group 13: Pseudo name when arguments (e.g. "nth-child")
 * Group 14: Arguments of pseudo (e.g. "2n + 1")
 * Group 15: Pseudo name when no arguments (e.g. "empty")
 * Group 16: Pseudo element (e.g. "::after", "::-webkit-inner-spin-button").
 * Group 17: Combinator.
 */
const SELECTOR_REGEXP = /(\*)|([a-zA-Z0-9-]+)|#((?:[a-zA-Z0-9-_]|\\.)+)|\.((?:[a-zA-Z0-9-_]|\\.)+)|\[([a-zA-Z0-9-_]+)\]|\[([a-zA-Z0-9-_]+) *([~|^$*]{0,1}) *= *["']{1}([^"']*)["']{1} *(s|i){0,1}\]|\[([a-zA-Z0-9-_]+) *([~|^$*]{0,1}) *= *([^\]]*)\]|:([a-zA-Z-]+) *\(([^)]+\)?)\)|:([a-zA-Z-]+)|::([a-zA-Z-]+)|([ ,+>]*)/g;
/**
 * Escaped Character RegExp.
 */
const ESCAPED_CHARACTER_REGEXP = /\\/g;
/**
 * Nth Function.
 */
const NTH_FUNCTION = {
    odd: (n) => (n + 1) % 2 === 0,
    even: (n) => (n + 1) % 2 !== 0,
    alwaysFalse: () => false
};
/**
 * Space RegExp.
 */
const SPACE_REGEXP = / /g;
/**
 * Simple Selector RegExp.
 *
 * Group 1: Tag name (e.g. "div")
 * Group 2: Class (e.g. ".classA.classB")
 * Group 3: ID (e.g. "#id")
 */
const SIMPLE_SELECTOR_REGEXP = /(^[a-zA-Z0-9-]+$)|(^\.[a-zA-Z0-9-_.]+$)|(^#[a-zA-Z0-9-_]+$)/;
/**
 * Utility for parsing a selection string.
 */
export default class SelectorParser {
    /**
     * Parses a selector string and returns an instance of SelectorItem.
     *
     * @param selector Selector.
     * @returns Selector item.
     */
    static getSelectorItem(selector) {
        return this.getSelectorGroups(selector)[0][0];
    }
    /**
     * Parses a selector string and returns groups with SelectorItem instances.
     *
     * @param selector Selector.
     * @returns Selector groups.
     */
    static getSelectorGroups(selector) {
        if (selector === '*') {
            return [[new SelectorItem({ tagName: '*' })]];
        }
        const simpleMatch = selector.match(SIMPLE_SELECTOR_REGEXP);
        if (simpleMatch) {
            if (simpleMatch[1]) {
                return [[new SelectorItem({ tagName: selector.toUpperCase() })]];
            }
            else if (simpleMatch[2]) {
                return [[new SelectorItem({ classNames: selector.replace('.', '').split('.') })]];
            }
            else if (simpleMatch[3]) {
                return [[new SelectorItem({ id: selector.replace('#', '') })]];
            }
        }
        const regexp = new RegExp(SELECTOR_REGEXP);
        let currentSelectorItem = new SelectorItem({
            combinator: SelectorCombinatorEnum.descendant
        });
        let currentGroup = [currentSelectorItem];
        const groups = [currentGroup];
        let isValid = false;
        let match;
        while ((match = regexp.exec(selector))) {
            if (match[0]) {
                isValid = true;
                if (match[1]) {
                    currentSelectorItem.tagName = '*';
                }
                else if (match[2]) {
                    currentSelectorItem.tagName = match[2].toUpperCase();
                }
                else if (match[3]) {
                    currentSelectorItem.id = match[3].replace(ESCAPED_CHARACTER_REGEXP, '');
                }
                else if (match[4]) {
                    currentSelectorItem.classNames = currentSelectorItem.classNames || [];
                    currentSelectorItem.classNames.push(match[4].replace(ESCAPED_CHARACTER_REGEXP, ''));
                }
                else if (match[5]) {
                    currentSelectorItem.attributes = currentSelectorItem.attributes || [];
                    currentSelectorItem.attributes.push({
                        name: match[5].toLowerCase(),
                        operator: null,
                        value: null,
                        modifier: null,
                        regExp: null
                    });
                }
                else if (match[6] && match[8] !== undefined) {
                    currentSelectorItem.attributes = currentSelectorItem.attributes || [];
                    currentSelectorItem.attributes.push({
                        name: match[6].toLowerCase(),
                        operator: match[7] || null,
                        value: match[8].replace(ESCAPED_CHARACTER_REGEXP, ''),
                        modifier: match[9] || null,
                        regExp: this.getAttributeRegExp({
                            operator: match[7],
                            value: match[8],
                            modifier: match[9]
                        })
                    });
                }
                else if (match[10] && match[12] !== undefined) {
                    currentSelectorItem.attributes = currentSelectorItem.attributes || [];
                    currentSelectorItem.attributes.push({
                        name: match[10].toLowerCase(),
                        operator: match[11] || null,
                        value: match[12].replace(ESCAPED_CHARACTER_REGEXP, ''),
                        modifier: null,
                        regExp: this.getAttributeRegExp({ operator: match[11], value: match[12] })
                    });
                }
                else if (match[13] && match[14]) {
                    currentSelectorItem.pseudos = currentSelectorItem.pseudos || [];
                    currentSelectorItem.pseudos.push(this.getPseudo(match[13], match[14]));
                }
                else if (match[15]) {
                    currentSelectorItem.pseudos = currentSelectorItem.pseudos || [];
                    currentSelectorItem.pseudos.push(this.getPseudo(match[15]));
                }
                else if (match[16]) {
                    currentSelectorItem.isPseudoElement = true;
                }
                else if (match[17]) {
                    switch (match[17].trim()) {
                        case ',':
                            currentSelectorItem = new SelectorItem({
                                combinator: SelectorCombinatorEnum.descendant
                            });
                            currentGroup = [currentSelectorItem];
                            groups.push(currentGroup);
                            break;
                        case '>':
                            currentSelectorItem = new SelectorItem({ combinator: SelectorCombinatorEnum.child });
                            currentGroup.push(currentSelectorItem);
                            break;
                        case '+':
                            currentSelectorItem = new SelectorItem({
                                combinator: SelectorCombinatorEnum.adjacentSibling
                            });
                            currentGroup.push(currentSelectorItem);
                            break;
                        case '':
                            currentSelectorItem = new SelectorItem({
                                combinator: SelectorCombinatorEnum.descendant
                            });
                            currentGroup.push(currentSelectorItem);
                            break;
                    }
                }
            }
            else {
                break;
            }
        }
        if (!isValid) {
            throw new DOMException(`Invalid selector: "${selector}"`);
        }
        return groups;
    }
    /**
     * Returns attribute RegExp.
     *
     * @param attribute Attribute.
     * @param attribute.value Attribute value.
     * @param attribute.operator Attribute operator.
     * @param attribute.modifier Attribute modifier.
     * @returns Attribute RegExp.
     */
    static getAttributeRegExp(attribute) {
        const modifier = attribute.modifier === 'i' ? 'i' : '';
        if (!attribute.operator || !attribute.value) {
            return null;
        }
        switch (attribute.operator) {
            // [attribute~="value"] - Contains a specified word.
            case '~':
                return new RegExp(`[- ]${attribute.value}|${attribute.value}[- ]|^${attribute.value}$`, modifier);
            // [attribute|="value"] - Starts with the specified word.
            case '|':
                return new RegExp(`^${attribute.value}[- ]|^${attribute.value}$`, modifier);
            // [attribute^="value"] - Begins with a specified value.
            case '^':
                return new RegExp(`^${attribute.value}`, modifier);
            // [attribute$="value"] - Ends with a specified value.
            case '$':
                return new RegExp(`${attribute.value}$`, modifier);
            // [attribute*="value"] - Contains a specified value.
            case '*':
                return new RegExp(`${attribute.value}`, modifier);
            default:
                return null;
        }
    }
    /**
     * Returns pseudo.
     *
     * @param name Pseudo name.
     * @param args Pseudo arguments.
     * @returns Pseudo.
     */
    static getPseudo(name, args) {
        const lowerName = name.toLowerCase();
        if (!args) {
            return { name: lowerName, arguments: null, selectorItem: null, nthFunction: null };
        }
        switch (lowerName) {
            case 'nth-last-child':
            case 'nth-child':
                const nthOfIndex = args.indexOf(' of ');
                const nthFunction = nthOfIndex !== -1 ? args.substring(0, nthOfIndex) : args;
                const selectorItem = nthOfIndex !== -1 ? this.getSelectorItem(args.substring(nthOfIndex + 4).trim()) : null;
                return {
                    name: lowerName,
                    arguments: args,
                    selectorItem,
                    nthFunction: this.getPseudoNthFunction(nthFunction)
                };
            case 'nth-of-type':
            case 'nth-last-of-type':
                return {
                    name: lowerName,
                    arguments: args,
                    selectorItem: null,
                    nthFunction: this.getPseudoNthFunction(args)
                };
            case 'not':
                return {
                    name: lowerName,
                    arguments: args,
                    selectorItem: this.getSelectorItem(args),
                    nthFunction: null
                };
            default:
                return { name: lowerName, arguments: args, selectorItem: null, nthFunction: null };
        }
    }
    /**
     * Returns pseudo nth function.
     *
     * Based on:
     * https://github.com/dperini/nwsapi/blob/master/src/nwsapi.js
     *
     * @param args Pseudo arguments.
     * @returns Pseudo nth function.
     */
    static getPseudoNthFunction(args) {
        if (args === 'odd') {
            return NTH_FUNCTION.odd;
        }
        else if (args === 'even') {
            return NTH_FUNCTION.even;
        }
        const parts = args.replace(SPACE_REGEXP, '').split('n');
        let partA = parseInt(parts[0], 10) || 0;
        if (parts[0] == '-') {
            partA = -1;
        }
        if (parts.length === 1) {
            return (n) => n == partA;
        }
        let partB = parseInt(parts[1], 10) || 0;
        if (parts[0] == '+') {
            partB = 1;
        }
        if (partA >= 1 || partA <= -1) {
            if (partA >= 1) {
                if (Math.abs(partA) === 1) {
                    return (n) => n > partB - 1;
                }
                return (n) => n > partB - 1 && (n + -1 * partB) % partA === 0;
            }
            if (Math.abs(partA) === 1) {
                return (n) => n < partB + 1;
            }
            return (n) => n < partB + 1 && (n + -1 * partB) % partA === 0;
        }
        if (parts[0]) {
            return (n) => n === partB;
        }
        return (n) => n > partB - 1;
    }
}
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