using System.Net;
using System.Net.Http.Headers;
using MiaoJiZhang.Api.Services;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging.Abstractions;

namespace MiaoJiZhang.Api.Tests;

public sealed class PushProviderTests
{
    private static readonly PushEnvelope Message = new(
        "message-1",
        "测试标题",
        "测试正文",
        "system",
        "home",
        null,
        3600);

    [Fact]
    public async Task Xiaomi_Http200BusinessFailure_IsNotAccepted()
    {
        var factory = new StubHttpClientFactory(_ => Json(
            """{"result":"error","code":70000003,"description":"invalid registration_id"}"""));
        var provider = Provider("xiaomi", factory, new Dictionary<string, string?>
        {
            ["Push:Providers:xiaomi:production:Enabled"] = "true",
            ["Push:Providers:xiaomi:production:AppSecret"] = "server-secret",
        });

        var result = await provider.SendAsync(
            "production",
            "com.nx.miaoji",
            "invalid-token",
            Message,
            CancellationToken.None);

        Assert.False(result.Accepted);
        Assert.True(result.InvalidToken);
        Assert.Equal("provider_error", result.ErrorCode);
    }

    [Fact]
    public async Task Xiaomi_Http200Success_IsAccepted()
    {
        var factory = new StubHttpClientFactory(_ => Json(
            """{"result":"ok","code":0,"data":{"id":"xiaomi-message"}}"""));
        var provider = Provider("xiaomi", factory, new Dictionary<string, string?>
        {
            ["Push:Providers:xiaomi:production:Enabled"] = "true",
            ["Push:Providers:xiaomi:production:AppSecret"] = "server-secret",
        });

        var result = await provider.SendAsync(
            "production",
            "com.nx.miaoji",
            "valid-token",
            Message,
            CancellationToken.None);

        Assert.True(result.Accepted);
        Assert.False(result.Retryable);
        Assert.False(result.InvalidToken);
    }

    [Fact]
    public async Task Huawei_AccessTokens_AreCachedPerFlavor()
    {
        var authCalls = new Dictionary<string, int>();
        var sendTokens = new Dictionary<string, List<string>>();
        var factory = new StubHttpClientFactory(request =>
        {
            var path = request.RequestUri!.AbsolutePath;
            var flavor = path.Contains("production", StringComparison.Ordinal)
                ? "production"
                : "internal";
            if (path.EndsWith("/auth", StringComparison.Ordinal))
            {
                authCalls[flavor] = authCalls.GetValueOrDefault(flavor) + 1;
                return Json($$"""{"access_token":"{{flavor}}-token","expires_in":3600}""");
            }

            sendTokens.TryAdd(flavor, []);
            sendTokens[flavor].Add(request.Headers.Authorization?.Parameter ?? "");
            return Json("""{"code":"80000000","requestId":"huawei-message"}""");
        });
        var provider = Provider("huawei", factory, new Dictionary<string, string?>
        {
            ["Push:Providers:huawei:production:Enabled"] = "true",
            ["Push:Providers:huawei:production:AppId"] = "production-app",
            ["Push:Providers:huawei:production:AppSecret"] = "production-secret",
            ["Push:Providers:huawei:production:AuthUrl"] = "https://push.test/production/auth",
            ["Push:Providers:huawei:production:SendUrl"] = "https://push.test/production/send",
            ["Push:Providers:huawei:internal:Enabled"] = "true",
            ["Push:Providers:huawei:internal:AppId"] = "internal-app",
            ["Push:Providers:huawei:internal:AppSecret"] = "internal-secret",
            ["Push:Providers:huawei:internal:AuthUrl"] = "https://push.test/internal/auth",
            ["Push:Providers:huawei:internal:SendUrl"] = "https://push.test/internal/send",
        });

        Assert.True((await provider.SendAsync(
            "production", "com.nx.miaoji", "token-1", Message, CancellationToken.None)).Accepted);
        Assert.True((await provider.SendAsync(
            "internal", "com.nx.miaoji.internal", "token-2", Message, CancellationToken.None)).Accepted);
        Assert.True((await provider.SendAsync(
            "production", "com.nx.miaoji", "token-3", Message, CancellationToken.None)).Accepted);

        Assert.Equal(1, authCalls["production"]);
        Assert.Equal(1, authCalls["internal"]);
        Assert.Equal(["production-token", "production-token"], sendTokens["production"]);
        Assert.Equal(["internal-token"], sendTokens["internal"]);
    }

    private static OfficialPushProvider Provider(
        string name,
        IHttpClientFactory factory,
        Dictionary<string, string?> values)
    {
        var configuration = new ConfigurationBuilder()
            .AddInMemoryCollection(values)
            .Build();
        return new OfficialPushProvider(
            name,
            configuration,
            factory,
            NullLogger<OfficialPushProvider>.Instance);
    }

    private static HttpResponseMessage Json(string body) => new(HttpStatusCode.OK)
    {
        Content = new StringContent(body),
    };

    private sealed class StubHttpClientFactory : IHttpClientFactory
    {
        private readonly HttpClient client;

        public StubHttpClientFactory(Func<HttpRequestMessage, HttpResponseMessage> response)
        {
            client = new HttpClient(new StubHandler(response));
        }

        public HttpClient CreateClient(string name) => client;
    }

    private sealed class StubHandler(Func<HttpRequestMessage, HttpResponseMessage> response)
        : HttpMessageHandler
    {
        protected override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request,
            CancellationToken cancellationToken) =>
            Task.FromResult(response(request));
    }
}