import Dataset from '#models/dataset';
import { Client } from '@opensearch-project/opensearch';
import { create } from 'xmlbuilder2';
import SaxonJS from 'saxon-js';
import DatasetXmlSerializer from '#app/Library/DatasetXmlSerializer';
import { XMLBuilder } from 'xmlbuilder2/lib/interfaces.js';
import logger from '@adonisjs/core/services/logger';
import { readFileSync } from 'fs';
import { DateTime } from 'luxon';
// import Config from '@ioc:Adonis/Core/Config';
import { getDomain } from '#app/utils/utility-functions';

// const opensearchNode = process.env.OPENSEARCH_HOST || 'localhost';
// const client = new Client({ node: `http://${opensearchNode}` }); // replace with your OpenSearch endpoint
interface XslTParameter {
    [key: string]: any;
}
export default {
    // opensearchNode: process.env.OPENSEARCH_HOST || 'localhost',
    client: new Client({ node: `http://${process.env.OPENSEARCH_HOST || 'localhost'}` }), // replace with your OpenSearch endpoint

    async getDoiRegisterString(dataset: Dataset): Promise<string | undefined> {
        try {
            const proc = readFileSync('public/assets2/doi_datacite.sef.json');
            const xsltParameter: XslTParameter = {};
            let xml = create({ version: '1.0', encoding: 'UTF-8', standalone: true }, '<root></root>');
            const datasetNode = xml.root().ele('Dataset');
            await createXmlRecord(dataset, datasetNode);
            const xmlString = xml.end({ prettyPrint: false });

            // set timestamp
            const date = DateTime.now();
            const unixTimestamp = date.toUnixInteger();
            xsltParameter['unixTimestamp'] = unixTimestamp;

            // set prefix
            let prefix = '';
            // let base_domain = '';
            // const datacite_environment = process.env.DATACITE_ENVIRONMENT || 'debug';
            // if (datacite_environment === 'debug') {
            //     prefix = process.env.DATACITE_TEST_PREFIX || '';
            //     base_domain = process.env.TEST_BASE_DOMAIN || '';
            // } else if (datacite_environment === 'production') {
            //     prefix = process.env.DATACITE_PREFIX || '';
            //     base_domain = process.env.BASE_DOMAIN || '';
            // }
            prefix = process.env.DATACITE_PREFIX || '';
            xsltParameter['prefix'] = prefix;

            const repIdentifier = 'tethys';
            xsltParameter['repIdentifier'] = repIdentifier;

            let xmlOutput; // = xmlString;
            try {
                const result = await SaxonJS.transform({
                    // stylesheetFileName: `${config.TMP_BASE_DIR}/data-quality/rules/iati.sef.json`,
                    stylesheetText: proc,
                    destination: 'serialized',
                    // sourceFileName: sourceFile,
                    sourceText: xmlString,
                    stylesheetParams: xsltParameter,
                    // logLevel: 10,
                });
                xmlOutput = result.principalResult;
            } catch (error) {
                logger.error('An error occurred while creating the user', error.message);
            }

            return xmlOutput;
        } catch (error) {
            logger.error(`An error occurred while indexing datsaet with publish_id ${dataset.publish_id}.`);
        }
    },

    /**
     * Index a dataset document to OpenSearch/Elasticsearch
     */
    async indexDocument(dataset: Dataset, index_name: string): Promise<void> {
        try {
            // Load XSLT transformation file
            const xsltProc = readFileSync('public/assets2/solr.sef.json');

            // Transform dataset to JSON document
            const jsonDoc: string = await this.getTransformedString(dataset, xsltProc);

            const document = JSON.parse(jsonDoc);

            // Index document to OpenSearch with doument json body
            await this.client.index({
                id: dataset.publish_id?.toString(),
                index: index_name,
                body: document,
                refresh: true, // make immediately searchable
            });
            logger.info(`Dataset ${dataset.publish_id} successfully indexed to ${index_name}`);
        } catch (error) {
            logger.error(`Failed to index dataset ${dataset.publish_id}: ${error.message}`);
            throw error; // Re-throw to allow caller to handle
        }
    },

    /**
     * Transform dataset XML to JSON using XSLT
     */
    async getTransformedString(dataset: Dataset, proc: Buffer): Promise<string> {
        // Generate XML string from dataset
        const xmlString = await this.generateDatasetXml(dataset);

        try {
            // Apply XSLT transformation
            const result = await SaxonJS.transform({
                stylesheetText: proc,
                destination: 'serialized',
                sourceText: xmlString,
            });
            return result.principalResult;
        } catch (error) {
            logger.error(`An error occurred while creating the user, error: ${error.message},`);
            return '';
        }
    },

    /**
     * Generate XML string from dataset model
     */
    async generateDatasetXml(dataset: Dataset): Promise<string> {
        const xml = create({ version: '1.0', encoding: 'UTF-8', standalone: true }, '<root></root>');
        const datasetNode = xml.root().ele('Dataset');

        await createXmlRecord(dataset, datasetNode);

        return xml.end({ prettyPrint: false });
    },
};
/**
 * Return the default global focus trap stack
 *
 * @return {import('focus-trap').FocusTrap[]}
 */

/**
 * Create complete XML record for dataset
 * Handles caching and metadata enrichment
 */
const createXmlRecord = async (dataset: Dataset, datasetNode: XMLBuilder): Promise<void> => {
    const domNode = await getDatasetXmlDomNode(dataset);

    if (!domNode) {
        throw new Error(`Failed to generate XML DOM node for dataset ${dataset.id}`);
    }

    // Enrich with landing page URL
    if (dataset.publish_id) {
        addLandingPageAttribute(domNode, dataset.publish_id.toString());
    }

    // Add data type specification
    addSpecInformation(domNode, `data-type:${dataset.type}`);

    // Add collection information
    if (dataset.collections) {
        for (const coll of dataset.collections) {
            const collRole = coll.collectionRole;
            addSpecInformation(domNode, `${collRole.oai_name}:${coll.number}`);
        }
    }

    datasetNode.import(domNode);
};

const getDatasetXmlDomNode = async (dataset: Dataset): Promise<XMLBuilder | null> => {
    const serializer = new DatasetXmlSerializer(dataset).enableCaching().excludeEmptyFields();
    // xmlModel.setModel(dataset);

    // Load cache relationship if not already loaded
    await dataset.load('xmlCache');
    if (dataset.xmlCache) {
        serializer.setCache(dataset.xmlCache);
    }

    // Generate or retrieve cached DOM document
    const xmlDocument: XMLBuilder | null = await serializer.toXmlDocument();
    return xmlDocument;
};

const addLandingPageAttribute = (domNode: XMLBuilder, dataid: string) => {
    const baseDomain = process.env.OAI_BASE_DOMAIN || 'localhost';
    const url = 'https://' + getDomain(baseDomain) + '/dataset/' + dataid;
    // add attribute du dataset xml element
    domNode.att('landingpage', url);
};

const addSpecInformation = (domNode: XMLBuilder, information: string) => {
    domNode.ele('SetSpec').att('Value', information);
};