using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CalendarPanel : MonoBehaviour
{
    [Header("组件")]
    public Text monthText;        // 当前月份显示的Text
    public Transform dateGrid;    // 用于显示日期的GridLayoutGroup
    public GameObject dayButtonPrefab; // 日期按钮的预制体
    public Button prevMonthBtn;  // 上一个月按钮
    public Button nextMonthBtn;  // 下一个月按钮
    public Text selectedDateText; // 显示选中的日期

    public DateTime currentDate;    // 当前显示的日期

    // Start is called before the first frame update
    void Start()
    {
        currentDate = DateTime.Now;  // 初始显示当前日期
        UpdateCalendar();

        //prevMonthBtn.onClick.AddListener(OnPrevMonth);
        //nextMonthBtn.onClick.AddListener(OnNextMonth);
    }

    // 更新日历面板
    void UpdateCalendar()
    {
        // 更新月份显示
        monthText.text = currentDate.ToString("yyyy年MM月");

        // 清空日期按钮之前，先确保日期按钮的销毁没有问题
        foreach (Transform child in dateGrid)
        {
            Destroy(child.gameObject);  // 销毁所有子物体（日期按钮）
        }

        // 获取当前月份的第一天
        DateTime firstDayOfMonth = new DateTime(currentDate.Year, currentDate.Month, 1);

        // 获取该月份的总天数
        int daysInMonth = DateTime.DaysInMonth(currentDate.Year, currentDate.Month);

        // 获取第一天是星期几
        int firstDayOfWeek = (int)firstDayOfMonth.DayOfWeek; // 0是星期日, 6是星期六

        // 生成空的占位符，填充前面几天
        for (int i = 0; i < firstDayOfWeek; i++)
        {
            GameObject emptyItem = Instantiate(dayButtonPrefab, dateGrid);
            emptyItem.SetActive(false);  // 隐藏这些占位符
        }

        // 生成当前月份的每一天
        for (int day = 1; day <= daysInMonth; day++)
        {
            GameObject dayItem = Instantiate(dayButtonPrefab, dateGrid);
            Button dayButton = dayItem.GetComponent<Button>();
            Text dayText = dayItem.GetComponentInChildren<Text>();

            dayText.text = day.ToString();

        }
    }
    // 上一个月
    public void OnPrevMonth()
    {
        currentDate = currentDate.AddMonths(-1);
        UpdateCalendar();
    }

    // 下一个月
    public void OnNextMonth()
    {
        currentDate = currentDate.AddMonths(1);
        UpdateCalendar();
    }

}