import axios from './axios.js';
import * as cheerio from 'cheerio';
import fs from 'fs/promises';
import path from 'path';
import { getEncryptedUrl } from './getEncryptedUrl.js';
import { scrapePaginatedData, reIndex } from './scraperUtils.js'; // Import new utils

const BASE_URL = 'http://120.236.48.169:89/HPMS/';
const START_URL = BASE_URL + 'presellCertList.aspx';

// Extracts table data from a given HTML content
async function extractDataFromHtml($, origin) {
    const dataPromises = $('.resultlist table tr:has(td)').get().map(async (row) => {
        const columns = $(row).find('td');
        // Based on debug.html, the structure is different and has 9 columns
        if (columns.length < 9) {
            return null;
        }
        
        const licenseCell = $(columns[1]); // 许可证号 is the 2nd column
        const licenseLinkTag = licenseCell.find('a');
        
        const rowData = {
            '序号': $(columns[0]).text().trim(),
            '许可证号': licenseLinkTag.text().trim(),
            '开发企业': $(columns[2]).text().trim(),
            '项目名称': $(columns[3]).text().trim(),
            '项目地址': $(columns[4]).text().trim(),
            '批准时间': $(columns[5]).text().trim(),
            '所在区域': $(columns[6]).text().trim(),
            '总套数': $(columns[7]).text().trim(),
            '可售套数': $(columns[8]).text().trim(),
            '许可证链接': '', // Initialize
        };

        // The link is inside an onclick attribute, not a standard href
        const onclickAttr = licenseLinkTag.attr('onclick');
        if (onclickAttr) {
            // Make regex flexible to handle single or double quotes
            const match = onclickAttr.match(/open_click\(['"]([^'"]+)['"]\)/);
            if (match && match[1]) {
                rowData['许可证链接'] = await getEncryptedUrl(match[1], origin);
            }
        }
        return rowData;
    });

    const data = await Promise.all(dataPromises);
    return data.filter(item => item !== null);
}

/**
 * Performs post-processing on the scraped data:
 * 1. Filters out records where "许可证号" is "空".
 * 2. Re-indexes "序号" sequentially using the utility function.
 * 3. Converts "总套数" and "可售套数" fields to numbers.
 * @param {Array<Object>} allData - The raw scraped data.
 * @returns {Promise<Array<Object>>} - The processed data.
 */
async function processScrapedData(allData) {
    // 1. Filter out records where "许可证号" is "空" or null
    let processedData = allData.filter(record => record['许可证号'] !== '空' && record['许可证号']);
    console.log(`删除无效许可证记录后，剩余 ${processedData.length} 条记录。`);

    // 2. Re-index "序号" sequentially
    reIndex(processedData); // Use the shared utility function

    // 3. Convert "总套数" and "可售套数" to numbers
    for (const record of processedData) {
        record['总套数'] = parseInt(record['总套数'], 10) || 0;
        record['可售套数'] = parseInt(record['可售套数'], 10) || 0;
    }
    console.log('"总套数" 和 "可售套数" 字段已转换为数字。');

    return processedData;
}

// 主函数 - 导出以便在根目录调用
export async function main() {
    try {
        console.log('🚀 开始抓取预售许可证数据...');
        const allData = await scrapePaginatedData(START_URL, extractDataFromHtml); // Use generic pagination

        const processedData = await processScrapedData(allData);

        const dataPath = path.join(path.dirname(new URL(import.meta.url).pathname), '..', 'data', 'preSaleLicense.json');
        await fs.mkdir(path.dirname(dataPath), { recursive: true });
        await fs.writeFile(dataPath, JSON.stringify(processedData, null, 4), 'utf-8');
        console.log(`✅ 更新后的数据已保存至 data/preSaleLicense.json 文件。`);

        console.log('\n所有数据处理和文件生成任务已完成。');

    } catch (error) {
        console.error('在 getPreSaleLicense.js 抓取或处理过程中发生错误:', error.message);
        if (error.response) {
            console.error('Status:', error.response.status);
        }
        throw error; // Re-throw the error to be caught by the caller
    }
}