/*---------------------------------------------------------------------------------------------
 *  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 nodes from '../parser/cssNodes';
import { Scanner } from '../parser/cssScanner';
import * as l10n from '@vscode/l10n';
export class Element {
    constructor() {
        this.parent = null;
        this.children = null;
        this.attributes = null;
    }
    findAttribute(name) {
        if (this.attributes) {
            for (const attribute of this.attributes) {
                if (attribute.name === name) {
                    return attribute.value;
                }
            }
        }
        return null;
    }
    addChild(child) {
        if (child instanceof Element) {
            child.parent = this;
        }
        if (!this.children) {
            this.children = [];
        }
        this.children.push(child);
    }
    append(text) {
        if (this.attributes) {
            const last = this.attributes[this.attributes.length - 1];
            last.value = last.value + text;
        }
    }
    prepend(text) {
        if (this.attributes) {
            const first = this.attributes[0];
            first.value = text + first.value;
        }
    }
    findRoot() {
        let curr = this;
        while (curr.parent && !(curr.parent instanceof RootElement)) {
            curr = curr.parent;
        }
        return curr;
    }
    removeChild(child) {
        if (this.children) {
            const index = this.children.indexOf(child);
            if (index !== -1) {
                this.children.splice(index, 1);
                return true;
            }
        }
        return false;
    }
    addAttr(name, value) {
        if (!this.attributes) {
            this.attributes = [];
        }
        for (const attribute of this.attributes) {
            if (attribute.name === name) {
                attribute.value += ' ' + value;
                return;
            }
        }
        this.attributes.push({ name, value });
    }
    clone(cloneChildren = true) {
        const elem = new Element();
        if (this.attributes) {
            elem.attributes = [];
            for (const attribute of this.attributes) {
                elem.addAttr(attribute.name, attribute.value);
            }
        }
        if (cloneChildren && this.children) {
            elem.children = [];
            for (let index = 0; index < this.children.length; index++) {
                elem.addChild(this.children[index].clone());
            }
        }
        return elem;
    }
    cloneWithParent() {
        const clone = this.clone(false);
        if (this.parent && !(this.parent instanceof RootElement)) {
            const parentClone = this.parent.cloneWithParent();
            parentClone.addChild(clone);
        }
        return clone;
    }
}
export class RootElement extends Element {
}
export class LabelElement extends Element {
    constructor(label) {
        super();
        this.addAttr('name', label);
    }
}
class MarkedStringPrinter {
    constructor(quote) {
        this.quote = quote;
        this.result = [];
        // empty
    }
    print(element) {
        this.result = [];
        if (element instanceof RootElement) {
            if (element.children) {
                this.doPrint(element.children, 0);
            }
        }
        else {
            this.doPrint([element], 0);
        }
        const value = this.result.join('\n');
        return [{ language: 'html', value }];
    }
    doPrint(elements, indent) {
        for (const element of elements) {
            this.doPrintElement(element, indent);
            if (element.children) {
                this.doPrint(element.children, indent + 1);
            }
        }
    }
    writeLine(level, content) {
        const indent = new Array(level + 1).join('  ');
        this.result.push(indent + content);
    }
    doPrintElement(element, indent) {
        const name = element.findAttribute('name');
        // special case: a simple label
        if (element instanceof LabelElement || name === '\u2026') {
            this.writeLine(indent, name);
            return;
        }
        // the real deal
        const content = ['<'];
        // element name
        if (name) {
            content.push(name);
        }
        else {
            content.push('element');
        }
        // attributes
        if (element.attributes) {
            for (const attr of element.attributes) {
                if (attr.name !== 'name') {
                    content.push(' ');
                    content.push(attr.name);
                    const value = attr.value;
                    if (value) {
                        content.push('=');
                        content.push(quotes.ensure(value, this.quote));
                    }
                }
            }
        }
        content.push('>');
        this.writeLine(indent, content.join(''));
    }
}
var quotes;
(function (quotes) {
    function ensure(value, which) {
        return which + remove(value) + which;
    }
    quotes.ensure = ensure;
    function remove(value) {
        const match = value.match(/^['"](.*)["']$/);
        if (match) {
            return match[1];
        }
        return value;
    }
    quotes.remove = remove;
})(quotes || (quotes = {}));
class Specificity {
    constructor() {
        /** Count of identifiers (e.g., `#app`) */
        this.id = 0;
        /** Count of attributes (`[type="number"]`), classes (`.container-fluid`), and pseudo-classes (`:hover`) */
        this.attr = 0;
        /** Count of tag names (`div`), and pseudo-elements (`::before`) */
        this.tag = 0;
    }
}
export function toElement(node, parentElement) {
    let result = new Element();
    for (const child of node.getChildren()) {
        switch (child.type) {
            case nodes.NodeType.SelectorCombinator:
                if (parentElement) {
                    const segments = child.getText().split('&');
                    if (segments.length === 1) {
                        // should not happen
                        result.addAttr('name', segments[0]);
                        break;
                    }
                    result = parentElement.cloneWithParent();
                    if (segments[0]) {
                        const root = result.findRoot();
                        root.prepend(segments[0]);
                    }
                    for (let i = 1; i < segments.length; i++) {
                        if (i > 1) {
                            const clone = parentElement.cloneWithParent();
                            result.addChild(clone.findRoot());
                            result = clone;
                        }
                        result.append(segments[i]);
                    }
                }
                break;
            case nodes.NodeType.SelectorPlaceholder:
                if (child.matches('@at-root')) {
                    return result;
                }
            // fall through
            case nodes.NodeType.ElementNameSelector:
                const text = child.getText();
                result.addAttr('name', text === '*' ? 'element' : unescape(text));
                break;
            case nodes.NodeType.ClassSelector:
                result.addAttr('class', unescape(child.getText().substring(1)));
                break;
            case nodes.NodeType.IdentifierSelector:
                result.addAttr('id', unescape(child.getText().substring(1)));
                break;
            case nodes.NodeType.MixinDeclaration:
                result.addAttr('class', child.getName());
                break;
            case nodes.NodeType.PseudoSelector:
                result.addAttr(unescape(child.getText()), '');
                break;
            case nodes.NodeType.AttributeSelector:
                const selector = child;
                const identifier = selector.getIdentifier();
                if (identifier) {
                    const expression = selector.getValue();
                    const operator = selector.getOperator();
                    let value;
                    if (expression && operator) {
                        switch (unescape(operator.getText())) {
                            case '|=':
                                // excatly or followed by -words
                                value = `${quotes.remove(unescape(expression.getText()))}-\u2026`;
                                break;
                            case '^=':
                                // prefix
                                value = `${quotes.remove(unescape(expression.getText()))}\u2026`;
                                break;
                            case '$=':
                                // suffix
                                value = `\u2026${quotes.remove(unescape(expression.getText()))}`;
                                break;
                            case '~=':
                                // one of a list of words
                                value = ` \u2026 ${quotes.remove(unescape(expression.getText()))} \u2026 `;
                                break;
                            case '*=':
                                // substring
                                value = `\u2026${quotes.remove(unescape(expression.getText()))}\u2026`;
                                break;
                            default:
                                value = quotes.remove(unescape(expression.getText()));
                                break;
                        }
                    }
                    result.addAttr(unescape(identifier.getText()), value);
                }
                break;
        }
    }
    return result;
}
function unescape(content) {
    const scanner = new Scanner();
    scanner.setSource(content);
    const token = scanner.scanUnquotedString();
    if (token) {
        return token.text;
    }
    return content;
}
export class SelectorPrinting {
    constructor(cssDataManager) {
        this.cssDataManager = cssDataManager;
    }
    selectorToMarkedString(node) {
        const root = selectorToElement(node);
        if (root) {
            const markedStrings = new MarkedStringPrinter('"').print(root);
            markedStrings.push(this.selectorToSpecificityMarkedString(node));
            return markedStrings;
        }
        else {
            return [];
        }
    }
    simpleSelectorToMarkedString(node) {
        const element = toElement(node);
        const markedStrings = new MarkedStringPrinter('"').print(element);
        markedStrings.push(this.selectorToSpecificityMarkedString(node));
        return markedStrings;
    }
    isPseudoElementIdentifier(text) {
        const match = text.match(/^::?([\w-]+)/);
        if (!match) {
            return false;
        }
        return !!this.cssDataManager.getPseudoElement("::" + match[1]);
    }
    selectorToSpecificityMarkedString(node) {
        //https://www.w3.org/TR/selectors-3/#specificity
        const calculateScore = (node) => {
            const specificity = new Specificity();
            elementLoop: for (const element of node.getChildren()) {
                switch (element.type) {
                    case nodes.NodeType.IdentifierSelector:
                        specificity.id++;
                        break;
                    case nodes.NodeType.ClassSelector:
                    case nodes.NodeType.AttributeSelector:
                        specificity.attr++;
                        break;
                    case nodes.NodeType.ElementNameSelector:
                        //ignore universal selector
                        if (element.matches("*")) {
                            break;
                        }
                        specificity.tag++;
                        break;
                    case nodes.NodeType.PseudoSelector:
                        const text = element.getText();
                        if (this.isPseudoElementIdentifier(text)) {
                            specificity.tag++; // pseudo element
                            continue elementLoop;
                        }
                        // where and child selectors have zero specificity
                        if (text.match(/^:where/i)) {
                            continue elementLoop;
                        }
                        // the most specific child selector
                        if (text.match(/^:(not|has|is)/i) && element.getChildren().length > 0) {
                            let mostSpecificListItem = new Specificity();
                            for (const containerElement of element.getChildren()) {
                                let list;
                                if (containerElement.type === nodes.NodeType.Undefined) { // containerElement is a list of selectors
                                    list = containerElement.getChildren();
                                }
                                else { // containerElement is a selector
                                    list = [containerElement];
                                }
                                for (const childElement of containerElement.getChildren()) {
                                    const itemSpecificity = calculateScore(childElement);
                                    if (itemSpecificity.id > mostSpecificListItem.id) {
                                        mostSpecificListItem = itemSpecificity;
                                        continue;
                                    }
                                    else if (itemSpecificity.id < mostSpecificListItem.id) {
                                        continue;
                                    }
                                    if (itemSpecificity.attr > mostSpecificListItem.attr) {
                                        mostSpecificListItem = itemSpecificity;
                                        continue;
                                    }
                                    else if (itemSpecificity.attr < mostSpecificListItem.attr) {
                                        continue;
                                    }
                                    if (itemSpecificity.tag > mostSpecificListItem.tag) {
                                        mostSpecificListItem = itemSpecificity;
                                        continue;
                                    }
                                }
                            }
                            specificity.id += mostSpecificListItem.id;
                            specificity.attr += mostSpecificListItem.attr;
                            specificity.tag += mostSpecificListItem.tag;
                            continue elementLoop;
                        }
                        specificity.attr++; //pseudo class
                        continue elementLoop;
                }
                if (element.getChildren().length > 0) {
                    const itemSpecificity = calculateScore(element);
                    specificity.id += itemSpecificity.id;
                    specificity.attr += itemSpecificity.attr;
                    specificity.tag += itemSpecificity.tag;
                }
            }
            return specificity;
        };
        const specificity = calculateScore(node);
        return `[${l10n.t("Selector Specificity")}](https://developer.mozilla.org/docs/Web/CSS/Specificity): (${specificity.id}, ${specificity.attr}, ${specificity.tag})`;
    }
}
class SelectorElementBuilder {
    constructor(element) {
        this.prev = null;
        this.element = element;
    }
    processSelector(selector) {
        let parentElement = null;
        if (!(this.element instanceof RootElement)) {
            if (selector.getChildren().some((c) => c.hasChildren() && c.getChild(0).type === nodes.NodeType.SelectorCombinator)) {
                const curr = this.element.findRoot();
                if (curr.parent instanceof RootElement) {
                    parentElement = this.element;
                    this.element = curr.parent;
                    this.element.removeChild(curr);
                    this.prev = null;
                }
            }
        }
        for (const selectorChild of selector.getChildren()) {
            if (selectorChild instanceof nodes.SimpleSelector) {
                if (this.prev instanceof nodes.SimpleSelector) {
                    const labelElement = new LabelElement('\u2026');
                    this.element.addChild(labelElement);
                    this.element = labelElement;
                }
                else if (this.prev && (this.prev.matches('+') || this.prev.matches('~')) && this.element.parent) {
                    this.element = this.element.parent;
                }
                if (this.prev && this.prev.matches('~')) {
                    this.element.addChild(new LabelElement('\u22EE'));
                }
                const thisElement = toElement(selectorChild, parentElement);
                const root = thisElement.findRoot();
                this.element.addChild(root);
                this.element = thisElement;
            }
            if (selectorChild instanceof nodes.SimpleSelector ||
                selectorChild.type === nodes.NodeType.SelectorCombinatorParent ||
                selectorChild.type === nodes.NodeType.SelectorCombinatorShadowPiercingDescendant ||
                selectorChild.type === nodes.NodeType.SelectorCombinatorSibling ||
                selectorChild.type === nodes.NodeType.SelectorCombinatorAllSiblings) {
                this.prev = selectorChild;
            }
        }
    }
}
function isNewSelectorContext(node) {
    switch (node.type) {
        case nodes.NodeType.MixinDeclaration:
        case nodes.NodeType.Stylesheet:
            return true;
    }
    return false;
}
export function selectorToElement(node) {
    if (node.matches('@at-root')) {
        return null;
    }
    const root = new RootElement();
    const parentRuleSets = [];
    const ruleSet = node.getParent();
    if (ruleSet instanceof nodes.RuleSet) {
        let parent = ruleSet.getParent(); // parent of the selector's ruleset
        while (parent && !isNewSelectorContext(parent)) {
            if (parent instanceof nodes.RuleSet) {
                if (parent.getSelectors().matches('@at-root')) {
                    break;
                }
                parentRuleSets.push(parent);
            }
            parent = parent.getParent();
        }
    }
    const builder = new SelectorElementBuilder(root);
    for (let i = parentRuleSets.length - 1; i >= 0; i--) {
        const selector = parentRuleSets[i].getSelectors().getChild(0);
        if (selector) {
            builder.processSelector(selector);
        }
    }
    builder.processSelector(node);
    return root;
}