using System.Collections.Specialized;
using System.Net.Http;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace Dpz.Core.Service;

public interface IBingWallpaper
{
    /// <summary>
    /// 随机获取一张壁纸
    /// </summary>
    /// <returns></returns>
    Task<Wallpaper> GetRandomWallpaperAsync();

    /// <summary>
    /// 获取今日的所有壁纸
    /// </summary>
    /// <returns></returns>
    Task<List<Wallpaper>> GetTodayWallpapersAsync();

    /// <summary>
    /// 清除缓存
    /// </summary>
    /// <returns></returns>
    Task ClearCacheAsync();
}

public class Wallpaper
{
    private const string Host = "https://cn.bing.com";

    private string _url = "";

    [JsonProperty("url")]
    public string Url
    {
        get => _url.StartsWith("http", StringComparison.OrdinalIgnoreCase) ? _url : Host + _url;
        set => _url = value;
    }

    [JsonProperty("copyright")]
    public string? CopyRight { get; set; }

    [JsonProperty("copyrightlink")]
    public string? CopyRightLink { get; set; }
}

public class BingWallpaper(
    ILogger<BingWallpaper> logger,
    IHttpClientFactory httpClientFactory,
    IFusionCache fusionCache
) : IBingWallpaper
{
    private const string CachePrefix = "Dpz.Core.Service.BingWallpaper";

    private readonly Wallpaper _defaultWallpaper = new()
    {
        Url = "/th?id=OHR.RedAlley_ZH-CN2795378972_1920x1080.jpg&rf=LaDigue_1920x1080.jpg&pid=hp",
        CopyRight = "武侯祠内红墙和竹林掩映下的小巷，中国成都 (© Eastimages/Getty Images)",
        CopyRightLink =
            "https://www.bing.com/search?q=%E6%AD%A6%E4%BE%AF%E7%A5%A0&form=hpcapt&mkt=zh-cn",
    };

    private async Task<List<Wallpaper>> FetchWallpaperAsync(
        CancellationToken cancellationToken = default
    )
    {
        try
        {
            //var request = new RestRequest("/HPImageArchive.aspx", Method.GET);

            var parameters = new NameValueCollection
            {
                { "format", "js" },
                //请求图片截止天数 0 今天 -1 截止中明天 （预准备的） 1 截止至昨天，类推（目前最多获取到7天前的图片）
                { "idx", "0" },
                //1-8 返回请求数量，目前最多一次获取8张
                { "n", "8" },
                //地区
                { "mkt", "zh-CN" },
            };

            var httpClient = httpClientFactory.CreateClient("edge");
            var request = new HttpRequestMessage(
                HttpMethod.Get,
                $"https://cn.bing.com/HPImageArchive.aspx?{parameters.ToQueryString()}"
            );

            var response = await httpClient.SendAsync(request, cancellationToken);
            var content = await response.Content.ReadAsStringAsync(cancellationToken);
            var result = JObject.Parse(content)["images"]?.ToObject<List<Wallpaper>>() ?? [];
            return result;
        }
        catch (Exception e)
        {
            logger.LogError(e, "获取bing壁纸失败");
            var result = new List<Wallpaper> { _defaultWallpaper };
            return result;
        }
    }

    private async Task<List<Wallpaper>> GetWallpaperAsync()
    {
        return await fusionCache.GetOrSetAsync<List<Wallpaper>>(
            BuildCacheKey(nameof(GetWallpaperAsync)),
            async (context, cancellationToken) =>
            {
                context.Tags = [CachePrefix, BuildMethodTag(nameof(GetWallpaperAsync))];
                return await FetchWallpaperAsync(cancellationToken);
            },
            options => options.SetDuration(TimeSpan.FromDays(1))
        );
    }

    public async Task<Wallpaper> GetRandomWallpaperAsync()
    {
        return await fusionCache.GetOrSetAsync<Wallpaper>(
            BuildCacheKey(nameof(GetRandomWallpaperAsync)),
            async (context, _) =>
            {
                context.Tags = [CachePrefix, BuildMethodTag(nameof(GetRandomWallpaperAsync))];
                var list = await GetWallpaperAsync();
                var result = list.OrderBy(_ => Guid.NewGuid()).FirstOrDefault();
                return result ?? _defaultWallpaper;
            },
            options => options.SetDuration(TimeSpan.FromDays(1))
        );
    }

    public async Task<List<Wallpaper>> GetTodayWallpapersAsync()
    {
        return await GetWallpaperAsync();
    }

    public async Task ClearCacheAsync()
    {
        await fusionCache.RemoveByTagAsync(CachePrefix);
    }

    private static string BuildCacheKey(string methodName) => CachePrefix + ":" + methodName;

    private static string BuildMethodTag(string methodName) => CachePrefix + ":" + methodName;
}