import * as PropertySymbol from '../PropertySymbol.js';
import Node from '../nodes/node/Node.js';
import NodeTypeEnum from '../nodes/node/NodeTypeEnum.js';
import HTMLElementConfig from '../config/HTMLElementConfig.js';
import HTMLElementConfigContentModelEnum from '../config/HTMLElementConfigContentModelEnum.js';
import NamespaceURI from '../config/NamespaceURI.js';
import XMLEncodeUtility from '../utilities/XMLEncodeUtility.js';
/**
 * Serializes a node into XML.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/XMLSerializer
 */
export default class XMLSerializer {
    /**
     * Serializes a node into XML.
     *
     * @param root Root node.
     * @returns Result.
     */
    serializeToString(root) {
        return this.#serializeToString(root);
    }
    /**
     * Serializes a node into XML.
     *
     * @param root Root node.
     * @param [inheritedDefaultNamespace] Default namespace.
     * @param [inheritedNamespacePrefixes] Inherited namespace prefixes.
     * @returns Result.
     */
    #serializeToString(root, inheritedDefaultNamespace = null, inheritedNamespacePrefixes = null) {
        switch (root[PropertySymbol.nodeType]) {
            case NodeTypeEnum.elementNode:
                const element = root;
                const localName = element[PropertySymbol.localName];
                let innerHTML = '';
                const namespacePrefixes = this.#getNamespacePrefixes(element, inheritedNamespacePrefixes);
                const elementPrefix = element[PropertySymbol.namespaceURI] === NamespaceURI.html
                    ? element[PropertySymbol.prefix]
                    : this.#getElementPrefix(element, namespacePrefixes);
                const tagName = `${elementPrefix ? elementPrefix + ':' : ''}${localName}`;
                const defaultNamespace = elementPrefix
                    ? inheritedDefaultNamespace
                    : element[PropertySymbol.namespaceURI] || inheritedDefaultNamespace;
                const attributes = this.#getAttributes(element, elementPrefix, inheritedDefaultNamespace, inheritedNamespacePrefixes);
                const childNodes = defaultNamespace === NamespaceURI.html && localName === 'template'
                    ? root.content[PropertySymbol.nodeArray]
                    : root[PropertySymbol.nodeArray];
                for (const node of childNodes) {
                    innerHTML += this.#serializeToString(node, defaultNamespace, namespacePrefixes);
                }
                if (!innerHTML &&
                    defaultNamespace === NamespaceURI.html &&
                    HTMLElementConfig[localName.toLowerCase()]?.contentModel ===
                        HTMLElementConfigContentModelEnum.noDescendants) {
                    return `<${tagName}${attributes} />`;
                }
                if (!innerHTML && defaultNamespace !== NamespaceURI.html) {
                    return `<${tagName}${attributes}/>`;
                }
                return `<${tagName}${attributes}>${innerHTML}</${tagName}>`;
            case Node.DOCUMENT_FRAGMENT_NODE:
            case Node.DOCUMENT_NODE:
                let html = '';
                if (root[PropertySymbol.xmlProcessingInstruction]) {
                    html += this.#serializeToString(root[PropertySymbol.xmlProcessingInstruction], inheritedDefaultNamespace, new Map(inheritedNamespacePrefixes));
                }
                for (const node of root[PropertySymbol.nodeArray]) {
                    html += this.#serializeToString(node, inheritedDefaultNamespace, new Map(inheritedNamespacePrefixes));
                }
                return html;
            case NodeTypeEnum.commentNode:
                return `<!--${root.textContent}-->`;
            case NodeTypeEnum.processingInstructionNode:
                return `<?${root.target} ${root.textContent}?>`;
            case NodeTypeEnum.textNode:
                const parentElement = root.parentElement;
                if (parentElement) {
                    const parentConfig = HTMLElementConfig[parentElement[PropertySymbol.localName]];
                    if (parentConfig?.contentModel === HTMLElementConfigContentModelEnum.rawText) {
                        return root.textContent;
                    }
                }
                return XMLEncodeUtility.encodeTextContent(root.textContent);
            case NodeTypeEnum.documentTypeNode:
                const doctype = root;
                const identifier = doctype.publicId ? ' PUBLIC' : doctype.systemId ? ' SYSTEM' : '';
                const publicId = doctype.publicId ? ` "${doctype.publicId}"` : '';
                const systemId = doctype.systemId ? ` "${doctype.systemId}"` : '';
                return `<!DOCTYPE ${doctype.name}${identifier}${publicId}${systemId}>`;
        }
        return '';
    }
    /**
     * Returns namespace prefixes.
     *
     * @param element Element.
     * @param inheritedNamespacePrefixes Inherited namespace prefixes.
     * @returns Namespace prefixes.
     */
    #getNamespacePrefixes(element, inheritedNamespacePrefixes) {
        const namespacePrefixes = new Map(inheritedNamespacePrefixes);
        for (const attribute of element[PropertySymbol.attributes][PropertySymbol.items].values()) {
            if (attribute[PropertySymbol.namespaceURI] === NamespaceURI.xmlns &&
                attribute[PropertySymbol.prefix]) {
                namespacePrefixes.set(attribute[PropertySymbol.value], attribute[PropertySymbol.localName]);
            }
        }
        return namespacePrefixes;
    }
    /**
     * Returns namespace prefixes.
     *
     * @param element Element.
     * @param namespacePrefixes Inherited namespace prefixes.
     * @returns Element prefix.
     */
    #getElementPrefix(element, namespacePrefixes) {
        if (element[PropertySymbol.prefix] && !element[PropertySymbol.namespaceURI]) {
            throw new Error('Element has a prefix but no namespace.');
        }
        if (!element[PropertySymbol.prefix]) {
            return null;
        }
        const elementPrefix = namespacePrefixes.get(element[PropertySymbol.namespaceURI]);
        if (elementPrefix) {
            return elementPrefix;
        }
        const existingPrefixes = new Set(namespacePrefixes.values());
        if (existingPrefixes.has(element[PropertySymbol.prefix])) {
            let i = 1;
            while (existingPrefixes.has('n' + i)) {
                i++;
            }
            namespacePrefixes.set(element[PropertySymbol.namespaceURI], 'n' + i);
            return 'n' + i;
        }
        namespacePrefixes.set(element[PropertySymbol.namespaceURI], element[PropertySymbol.prefix]);
        return element[PropertySymbol.prefix];
    }
    /**
     * Returns attributes as a string.
     *
     * @param element Element.
     * @param elementPrefix Element prefix.
     * @param inheritedDefaultNamespace Inherited default namespace.
     * @param inheritedNamespacePrefixes Inherited namespace prefixes.
     * @returns Attributes.
     */
    #getAttributes(element, elementPrefix, inheritedDefaultNamespace, inheritedNamespacePrefixes) {
        let attributeString = '';
        let namespaceString = '';
        const handledNamespaces = new Set();
        for (const attribute of element[PropertySymbol.attributes][PropertySymbol.items].values()) {
            // Namespace attributes should be in the beginning of the string.
            if (attribute[PropertySymbol.namespaceURI] === NamespaceURI.xmlns) {
                if (elementPrefix &&
                    attribute[PropertySymbol.localName] === elementPrefix &&
                    element[PropertySymbol.namespaceURI]) {
                    namespaceString += ` xmlns:${elementPrefix}="${XMLEncodeUtility.encodeXMLAttributeValue(element[PropertySymbol.namespaceURI])}"`;
                    handledNamespaces.add(element[PropertySymbol.namespaceURI]);
                }
                else if (!elementPrefix &&
                    attribute[PropertySymbol.name] === 'xmlns' &&
                    element[PropertySymbol.namespaceURI]) {
                    namespaceString += ` xmlns="${XMLEncodeUtility.encodeXMLAttributeValue(element[PropertySymbol.namespaceURI])}"`;
                    handledNamespaces.add(element[PropertySymbol.namespaceURI]);
                }
                else {
                    namespaceString += ` ${attribute[PropertySymbol.name]}="${XMLEncodeUtility.encodeXMLAttributeValue(attribute[PropertySymbol.value])}"`;
                    handledNamespaces.add(attribute[PropertySymbol.value]);
                }
            }
            else {
                attributeString += ` ${attribute[PropertySymbol.name]}="${XMLEncodeUtility.encodeXMLAttributeValue(attribute[PropertySymbol.value])}"`;
            }
        }
        // We should add the namespace as an attribute if it has not been added yet.
        if (element[PropertySymbol.namespaceURI] &&
            inheritedDefaultNamespace !== element[PropertySymbol.namespaceURI] &&
            !handledNamespaces.has(element[PropertySymbol.namespaceURI])) {
            if (elementPrefix && !inheritedNamespacePrefixes.has(element[PropertySymbol.namespaceURI])) {
                namespaceString += ` xmlns:${elementPrefix}="${XMLEncodeUtility.encodeXMLAttributeValue(element[PropertySymbol.namespaceURI])}"`;
            }
            else if (!elementPrefix &&
                inheritedDefaultNamespace !== element[PropertySymbol.namespaceURI]) {
                namespaceString += ` xmlns="${XMLEncodeUtility.encodeXMLAttributeValue(element[PropertySymbol.namespaceURI])}"`;
            }
        }
        return namespaceString + attributeString;
    }
}
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