'use strict';

const common = require(__dirname + '/common');
const cleaner = require(__dirname + '/cleaner');

/**
 * Create a doc element
 * @param {Element} element The root element
 * @returns object The doc object
 */
const createDoc = function($, element) {
    let doc = {
        id: $(element).attr('id'),
        name: $(element)
            .text()
            .trim(),
    };
    try {
        /* jshint -W083 */
        // Parse ul > li
        const ulElementList = $(element)
            .nextAll()
            .not('p')
            .first();
        if (ulElementList.find('li > strong').length === 0) {
            return { id: null };
        }
        ulElementList.find('li').each((i, elementDescr) => {
            const valueKey = $(elementDescr);
            const key = valueKey
                .find('strong')
                .text()
                .toLowerCase()
                .trim();
            const value = $(elementDescr)
                .text()
                .replace(valueKey.find('strong').text(), '')
                .trim();
            switch (key) {
                case 'dynamic:':
                    doc.dynamic = value.toLowerCase() === 'yes';
                    break;
                case 'scope:':
                    doc.scope = value
                        .toLowerCase()
                        .split(',')
                        .map(item => {
                            if (item.match(/session/)) {
                                return 'session';
                            } else if (item.match(/global/)) {
                                return 'global';
                            } else {
                                return item.trim();
                            }
                        });
                    doc.scope = doc.scope.filter(function(e) {
                        return e === 0 || e;
                    });
                    break;
                case 'type:':
                    doc.type = cleaner.cleanType(value.toLowerCase());
                    break;
                case 'data type:':
                    /*
                     * Default method, <li> has a <code> child
                     * Example: <li><strong>Data Type:</strong> <code>numeric</code></li>
                     */
                    let dataType = valueKey.find('code');
                    if (dataType.length > 0) {
                        doc.type = cleaner.cleanType(
                            dataType
                                .first()
                                .text()
                                .toLowerCase()
                                .trim()
                        );
                    } else {
                        /*
                         * Fallback method, <li> has text
                         * Example: <li><strong>Data Type:</strong> boolean</li>
                         */
                        let dataType = value.replace(/undefined/gi, '');
                        dataType = dataType.toLowerCase().trim();
                        if (dataType !== '') {
                            doc.type = cleaner.cleanType(dataType);
                        } else if (dataType === '') {
                            console.log('Empty datatype found for : ' + doc.id);
                        } else {
                            console.log('No datatype found for : ' + doc.id);
                        }
                    }
                    break;
                case 'description:':
                    doc.type = cleaner.cleanType(value.toLowerCase());
                    break;
                case 'default value:':
                case 'default:':
                    doc.default = cleaner.cleanDefault(
                        valueKey
                            .text()
                            .replace(valueKey.find('strong').text(), '')
                            .trim()
                    );
                    break;
                case 'valid values:':
                    doc.validValues = valueKey
                        .find('code')
                        .get()
                        .map(el => $(el).text());
                    break;
                case 'range:':
                    doc.range = valueKey
                        .find('code')
                        .get()
                        .map(el => $(el).text());
                    if (doc.range.length === 1) {
                        // try x-y
                        doc.range = doc.range[0].split('-').map(item => item.trim());
                    }
                    if (doc.range.length === 1) {
                        // try x to y
                        doc.range = doc.range[0].split('to').map(item => item.trim());
                    }
                    if (doc.range[1] !== undefined) {
                        doc.range[1] = parseFloat(doc.range[1]);
                    }
                    if (doc.range.length === 1) {
                        // try x upwards
                        if (value.includes('upwards')) {
                            doc.range[1] = value;
                        }
                    }
                    // Could be oneday a float
                    doc.range = {
                        from: parseFloat(doc.range[0]),
                        to: doc.range[1],
                    };
                    doc.range = cleaner.cleanRange(doc.range);

                    break;
                case 'commandline:':
                    if (
                        typeof value === 'string' &&
                        (value.toLowerCase() !== 'no' &&
                            value.toLowerCase() !== 'none' &&
                            value.toLowerCase() !== 'n/a' &&
                            value.toLowerCase() !== 'no commandline option')
                    ) {
                        doc.cli = cleaner.cleanCli(value, true);
                    }
                    break;
                default:
                    break;
            }
        });
        /* jshint +W083 */
    } catch (e) {
        console.error(e);
        console.log('Error at : #' + doc.id);
    }
    if (doc.type !== undefined) {
        if (doc.type === 'numeric') {
            doc.type = 'integer';
        }
    }
    return doc;
};

function parsePage($, cbSuccess) {
    var anchors = [];
    $('.anchored_heading').each(function(i, el) {
        let doc = createDoc($, el);
        if (doc.id && typeof doc.id === 'string') {
            anchors.push(doc);
        }
    });
    cbSuccess(anchors);
}

const KB_URL = 'https://mariadb.com/kb/en/library/documentation/';

const storageEngines = ['aria', 'myrocks', 'cassandra', 'galera-cluster', 'mroonga', 'myisam', 'tokudb', 'connect'];

const systemVariables = ['xtradbinnodb-server', 'mariadb-audit-plugin', 'ssltls', 'performance-schema'];

const custom = [
    {
        url: 'columns-storage-engines-and-plugins/storage-engines/spider/spider-server-system-variables/',
        name: 'spider-server-system-variables',
    },
    {
        url: 'semisynchronous-replication/',
        name: 'semisynchronous-replication-system-variables',
    },
    {
        url: 'replication-and-binary-log-server-system-variables/',
        name: 'replication-and-binary-log-server-system-variables',
    },
    {
        url: 'gtid/',
        name: 'gtid-system-variables',
    },
    {
        url: 'replication/optimization-and-tuning/system-variables/server-system-variables/',
        name: 'server-system-variables',
    },
    {
        url: 'system-versioned-tables/',
        name: 'versioned-tables-system-variables',
    },
];

const status = [
    'server',
    'galera-cluster',
    'aria-server',
    'cassandra',
    'mroonga',
    'spider-server',
    'sphinx',
    'tokudb',
    'xtradbinnodb-server',
    'replication-and-binary-log',
    'oqgraph-system-and',
    'thread-pool-system-and',
    'ssltls',
    'mariadb-audit-plugin',
    'semisynchronous-replication-plugin',
];

const pages = [];

storageEngines.forEach(se => {
    pages.push({
        url: KB_URL + 'columns-storage-engines-and-plugins/storage-engines/' + se + '/' + se + '-system-variables/',
        name: se + '-system-variables',
    });
});

custom.forEach(cu => {
    pages.push({
        url: KB_URL + cu.url,
        name: cu.name,
    });
});

status.forEach(statusName => {
    pages.push({
        url: KB_URL + statusName + '-status-variables/',
        name: statusName + '-status-variables',
    });
});

systemVariables.forEach(systemVariableName => {
    pages.push({
        url: KB_URL + systemVariableName + '-system-variables/',
        name: systemVariableName + '-system-variables',
    });
});

module.exports = {
    run: () => {
        /*var pages = [
            {
                url: 'http://7.2.local/Global%20Transaction%20ID%20-%20MariaDB%20Knowledge%20Base.html',
                name: 'gtid-system-variables'
            }
        ]*/
        return common.processDataExtraction(pages, 'mariadb-', parsePage);
    },
};