using System.Text.Json.Serialization;

namespace Service;

/// <summary>
/// 节假日服务接口
/// </summary>
public interface IHolidayService
{
    /// <summary>
    /// 从API获取并缓存节假日数据
    /// </summary>
    Task<bool> FetchAndCacheHolidaysAsync(int year);

    /// <summary>
    /// 获取指定年份的节假日数据
    /// </summary>
    Task<List<Holiday>> GetHolidaysByYearAsync(int year);

    /// <summary>
    /// 获取指定日期范围的节假日数据
    /// </summary>
    Task<List<Holiday>> GetHolidaysByDateRangeAsync(string startDate, string endDate);
}

/// <summary>
/// 节假日服务实现
/// </summary>
public class HolidayService(
    IHolidayRepository holidayRepository,
    IHttpClientFactory httpClientFactory,
    ILogger<HolidayService> logger) : IHolidayService
{
    private const string HolidayApiUrl = "https://publicapi.xiaoai.me/holiday/year";

    public async Task<bool> FetchAndCacheHolidaysAsync(int year)
    {
        try
        {
            logger.LogInformation("开始获取 {Year} 年节假日数据", year);

            // 调用API获取数据
            var httpClient = httpClientFactory.CreateClient();
            var response = await httpClient.GetStringAsync($"{HolidayApiUrl}?date={year}");

            // 解析JSON
            var apiResponse = JsonSerializer.Deserialize<HolidayApiResponse>(response);
            if (apiResponse?.Code != 0 || apiResponse.Data == null)
            {
                logger.LogError("获取节假日数据失败: {Message}", apiResponse?.Msg);
                return false;
            }

            // 删除旧数据
            await holidayRepository.DeleteByYearAsync(year);

            // 转换并保存新数据
            var holidays = apiResponse.Data.Select(item => new Holiday
            {
                Year = year,
                DayType = item.DayType,
                HolidayName = item.Holiday,
                Rest = item.Rest,
                Date = item.Date,
                Week = item.Week,
                WeekDescCn = item.WeekDescCn
            }).ToList();

            await holidayRepository.AddRangeAsync(holidays);

            logger.LogInformation("成功缓存 {Count} 条节假日数据", holidays.Count);
            return true;
        }
        catch (Exception ex)
        {
            // 静默失败，仅记录日志
            logger.LogError(ex, "获取并缓存节假日数据失败");
            return false;
        }
    }

    public async Task<List<Holiday>> GetHolidaysByYearAsync(int year)
    {
        return await holidayRepository.GetByYearAsync(year);
    }

    public async Task<List<Holiday>> GetHolidaysByDateRangeAsync(string startDate, string endDate)
    {
        return await holidayRepository.GetByDateRangeAsync(startDate, endDate);
    }
}

/// <summary>
/// 节假日API响应模型
/// </summary>
public class HolidayApiResponse
{
    [JsonPropertyName("code")]
    public int Code { get; set; }

    [JsonPropertyName("msg")]
    public string Msg { get; set; } = string.Empty;

    [JsonPropertyName("data")]
    public List<HolidayApiData>? Data { get; set; }
}

/// <summary>
/// 节假日API数据模型
/// </summary>
public class HolidayApiData
{
    [JsonPropertyName("daytype")]
    public int DayType { get; set; }

    [JsonPropertyName("holiday")]
    public string Holiday { get; set; } = string.Empty;

    [JsonPropertyName("rest")]
    public int Rest { get; set; }

    [JsonPropertyName("date")]
    public string Date { get; set; } = string.Empty;

    [JsonPropertyName("week")]
    public int Week { get; set; }

    [JsonPropertyName("week_desc_cn")]
    public string WeekDescCn { get; set; } = string.Empty;
}