#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const axios = require('axios');
require('dotenv').config({ path: path.join(__dirname, '../../../.env') });

// API配置
const API_BASE_URL = process.env.API_BASE_URL || 'https://api.qonnwolf.com/api/v1';
const AUTHORIZATION = process.env.AUTHORIZATION || '';
const TEACHER_NAME = process.env.EMPLOYEE_NAME || '橙子(程城)';

// 日期处理工具函数
function formatDate(date) {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const day = String(date.getDate()).padStart(2, '0');
  return `${year}-${month}-${day}`;
}

function parseDate(dateStr) {
  // 支持多种日期格式：2026-04-24、2026/04/24、20260424、04-24、4月24日等
  dateStr = dateStr.replace(/年|月/g, '-').replace(/日/g, '');

  // 如果是短日期，默认使用当前年份
  if (/^\d{1,2}-\d{1,2}$/.test(dateStr)) {
    const currentYear = new Date().getFullYear();
    dateStr = `${currentYear}-${dateStr}`;
  }

  // 处理纯数字格式
  if (/^\d{8}$/.test(dateStr)) {
    dateStr = `${dateStr.slice(0, 4)}-${dateStr.slice(4, 6)}-${dateStr.slice(6, 8)}`;
  }

  // 替换斜杠为横杠
  dateStr = dateStr.replace(/\//g, '-');

  const date = new Date(dateStr);
  if (isNaN(date.getTime())) {
    throw new Error(`无效的日期格式：${dateStr}，请使用YYYY-MM-DD格式`);
  }
  return date;
}

function getDateRange(startDateStr, endDateStr) {
  const startDate = parseDate(startDateStr);
  const endDate = endDateStr ? parseDate(endDateStr) : startDate;

  if (startDate > endDate) {
    throw new Error('开始日期不能晚于结束日期');
  }

  const dates = [];
  const currentDate = new Date(startDate);
  while (currentDate <= endDate) {
    dates.push(formatDate(currentDate));
    currentDate.setDate(currentDate.getDate() + 1);
  }
  return dates;
}

// 调用API获取单天数据
async function fetchSchedule(date) {
  try {
    console.log(`正在获取 ${date} 的教学日程数据...`);
    const response = await axios.get(`${API_BASE_URL}/reports/teaching-schedule`, {
      headers: {
        'Authorization': AUTHORIZATION
      },
      params: {
        teaching_date: date,
        teacher_name: TEACHER_NAME
      }
    });

    if (response.data.code !== 0) {
      throw new Error(`API返回错误：${response.data.message}`);
    }

    const data = response.data.data;
    return {
      teaching_date: date,
      items: data.items.map(item => ({
        class_id: item.class_id,
        class_name: item.class_name,
        start_time: item.teaching_time_period.split('-')[0].trim(),
        end_time: item.teaching_time_period.split('-')[1].trim(),
        teacher_name: item.teacher_name,
        classroom: item.school_name,
        students: item.student_names.map(name => {
          // 先默认都是出勤，后续可以根据实际出勤数据调整
          return {
            student_name: name,
            attendance_status: '✅ 出勤',
            remark: ''
          };
        })
      }))
    };
  } catch (error) {
    console.error(`获取 ${date} 数据失败：`, error.message);
    throw error;
  }
}

// 批量获取日期范围内的数据
async function fetchScheduleRange(dates) {
  const scheduleData = [];
  for (const date of dates) {
    const data = await fetchSchedule(date);
    scheduleData.push(data);
  }
  return scheduleData;
}

// 生成HTML文件
function generateHTML(scheduleData, startDate, endDate) {
  // 读取模板文件
  const templatePath = path.join(__dirname, 'template.html');
  let template = fs.readFileSync(templatePath, 'utf-8');

  // 生成日期范围显示文本
  const dateRangeText = startDate === endDate ? startDate : `${startDate} 至 ${endDate}`;
  const updateTime = formatDate(new Date()) + ' ' + new Date().toTimeString().slice(0, 5);

  // 替换模板中的占位符
  template = template.replace(/{{dateRange}}/g, dateRangeText);
  template = template.replace(/{{updateTime}}/g, updateTime);
  template = template.replace(/{{totalDays}}/g, scheduleData.length);
  template = template.replace(/const scheduleData = {{scheduleData}};/, `const scheduleData = ${JSON.stringify(scheduleData, null, 2)};`);

  // 确保输出目录存在
  const outputDir = path.join(__dirname, `../../../output/teaching-schedule/${dateRangeText.replace(/ 至 /g, '_')}`);
  if (!fs.existsSync(outputDir)) {
    fs.mkdirSync(outputDir, { recursive: true });
  }

  // 写入HTML文件
  const htmlPath = path.join(outputDir, 'schedule.html');
  fs.writeFileSync(htmlPath, template, 'utf-8');

  // 写入JSON数据文件
  const jsonPath = path.join(outputDir, 'schedule.json');
  fs.writeFileSync(jsonPath, JSON.stringify(scheduleData, null, 2), 'utf-8');

  return {
    htmlPath,
    jsonPath,
    outputDir,
    dateRangeText
  };
}

// 主函数
async function main() {
  try {
    // 解析命令行参数
    const args = process.argv.slice(2);
    let startDateStr, endDateStr;

    if (args.length === 0) {
      // 默认查询今天
      const today = new Date();
      startDateStr = formatDate(today);
      endDateStr = startDateStr;
    } else if (args.length === 1) {
      // 查询单天
      startDateStr = args[0];
      endDateStr = startDateStr;
    } else {
      // 查询时间段
      startDateStr = args[0];
      endDateStr = args[1];
    }

    // 获取日期范围
    const dates = getDateRange(startDateStr, endDateStr);
    const startDate = dates[0];
    const endDate = dates[dates.length - 1];

    console.log(`查询日期范围：${startDate} 至 ${endDate}`);
    console.log(`共 ${dates.length} 天`);

    // 获取数据
    const scheduleData = await fetchScheduleRange(dates);

    // 统计信息
    const totalClasses = scheduleData.reduce((sum, day) => sum + day.items.length, 0);
    const totalStudents = scheduleData.reduce((sum, day) => {
      return sum + day.items.reduce((daySum, cls) => daySum + cls.students.length, 0);
    }, 0);

    console.log(`查询完成：共 ${totalClasses} 节课，${totalStudents} 人次`);

    // 生成HTML
    const result = generateHTML(scheduleData, startDate, endDate);

    console.log('');
    console.log('✅ 教学日程生成成功！');
    console.log('📁 输出目录：', result.outputDir);
    console.log('📄 网页文件：', result.htmlPath);
    console.log('📊 数据文件：', result.jsonPath);
    console.log('');
    console.log('直接打开schedule.html文件即可查看教学日程！');

  } catch (error) {
    console.error('❌ 生成失败：', error.message);
    process.exit(1);
  }
}

// 运行主函数
if (require.main === module) {
  main();
}

module.exports = {
  fetchSchedule,
  fetchScheduleRange,
  generateHTML
};