namespace Yh.SchClass.OpenApi.Tests;

/// <summary>
/// 响应解析与状态码归一（教务 OA 兼容端点约定）：
/// 成功返回裸数据；404 / 204 表示"无数据"归一为 null / 空列表；400 及其它非 2xx 抛异常。
/// </summary>
public class SchClassResponseParsingTests
{
    private static readonly SchClassOpenApiOptions Options = new() { BaseHost = "http://base.yunhaixingtong.com" };

    private static SchClassVClassClient VClass(FakeHandler handler) => new(new HttpClient(handler), Options);

    private static SchClassTeaInfoClient Tea(FakeHandler handler) => new(new HttpClient(handler), Options);

    private static SchClassSchoolingClient Schooling(FakeHandler handler) => new(new HttpClient(handler), Options);

    [Fact]
    public async Task 裸数组_解析为兼容行列表()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK, """
        [{"Id":1,"Name":"高一(1)班","ClassID":1001,"SchSerID":"S001"},
         {"Id":2,"Name":"高一(2)班","ClassID":1002,"SchSerID":"S001"}]
        """);

        var rows = await VClass(handler).GetVClassListAsync("S001");

        Assert.Equal(2, rows.Count);
        Assert.Equal("高一(1)班", rows[0]["Name"].GetString());
        Assert.Equal(1001, rows[0]["ClassID"].GetInt32());
        Assert.Equal("S001", rows[1]["SchSerID"].GetString());
    }

    [Fact]
    public async Task 单对象_归一为单项列表()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK, """{"Id":9,"Name":"高三(7)班"}""");

        var rows = await VClass(handler).GetVClassListAsync("S001");

        Assert.Single(rows);
        Assert.Equal(9, rows[0]["Id"].GetInt32());
    }

    [Fact]
    public async Task 裸字符串数组_解析为List_string()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK, """["语文","数学"]""");

        var subs = await new SchClassSubInfoClient(new HttpClient(handler), Options)
            .GetSchTeachSubListAsync("S001");

        Assert.Equal(new[] { "语文", "数学" }, subs);
    }

    [Fact]
    public async Task HTTP404_列表归一为空列表()
    {
        var rows = await VClass(FakeHandler.Empty(HttpStatusCode.NotFound)).GetVClassListAsync("S001");

        Assert.Empty(rows);
    }

    [Fact]
    public async Task HTTP404_单对象归一为null()
    {
        var row = await VClass(FakeHandler.Empty(HttpStatusCode.NotFound)).GetVClassFirstAsync("1001");

        Assert.Null(row);
    }

    [Fact]
    public async Task HTTP204_归一为空列表()
    {
        var handler = FakeHandler.Json(HttpStatusCode.NoContent, "");

        var list = await Tea(handler).GetArrTeaInfoAsync("1,2,3");

        Assert.Empty(list);
    }

    [Fact]
    public async Task HTTP400_抛异常并携带状态码与响应体()
    {
        var handler = FakeHandler.Text(HttpStatusCode.BadRequest, "Required String parameter 'userIds' is not present");

        var ex = await Assert.ThrowsAsync<SchClassOpenApiException>(() => Tea(handler).GetArrTeaInfoAsync(null!));

        Assert.Equal(400, ex.StatusCode);
        Assert.Contains("400", ex.Message);
        Assert.Contains("userIds", ex.ResponseBody!);
    }

    [Fact]
    public async Task HTTP500_抛异常()
    {
        var handler = FakeHandler.Text(HttpStatusCode.InternalServerError, "boom");

        var ex = await Assert.ThrowsAsync<SchClassOpenApiException>(() => VClass(handler).GetVClassListAsync("S001"));

        Assert.Equal(500, ex.StatusCode);
        Assert.Contains("500", ex.Message);
    }

    [Fact]
    public async Task 空响应体_返回空列表不抛()
    {
        var handler = new FakeHandler((_, _) => new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new StringContent("", Encoding.UTF8, "application/json"),
        });

        Assert.Empty(await VClass(handler).GetVClassListAsync("S001"));
        Assert.Null(await VClass(handler).GetVClassFirstAsync("1"));
    }

    [Fact]
    public async Task JSON字面量null_返回空列表()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK, "null");

        Assert.Empty(await VClass(handler).GetVClassListAsync("S001"));
    }

    [Fact]
    public async Task 信封code0_提取data节点()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK,
            """{"code":0,"msg":"","data":[{"Id":1,"Name":"高一(1)班"}]}""");

        var rows = await VClass(handler).GetVClassListAsync("S001");

        Assert.Single(rows);
        Assert.Equal("高一(1)班", rows[0]["Name"].GetString());
    }

    [Fact]
    public async Task 信封code0且data为null_归一为空()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK, """{"code":0,"msg":"ok","data":null}""");

        Assert.Empty(await VClass(handler).GetVClassListAsync("S001"));
    }

    [Fact]
    public async Task 信封业务失败_抛异常并携带msg()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK,
            """{"code":3,"msg":"学校不存在","data":null}""");

        var ex = await Assert.ThrowsAsync<SchClassOpenApiException>(() => VClass(handler).GetVClassListAsync("S001"));

        Assert.Equal("学校不存在", ex.Message);
        Assert.Equal(0, ex.StatusCode);
        Assert.Contains("学校不存在", ex.ResponseBody!);
    }

    [Fact]
    public async Task 业务行含code字段_不被误判为信封()
    {
        // 学制等级行自身带 code=gradeId 字段，只有 code 而没有 data/msg，必须原样返回
        var handler = FakeHandler.Json(HttpStatusCode.OK,
            """[{"Id":1,"Name":"一年级","OwnerId":2,"Levell":1,"code":11,"sx":1}]""");

        var rows = await Schooling(handler).GetSchLenLevelListAsync("S001");

        Assert.Single(rows);
        Assert.Equal(11, rows[0]["code"].GetInt32());
        Assert.Equal("一年级", rows[0]["Name"].GetString());
    }

    [Fact]
    public async Task 非法JSON_抛解析异常()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK, "<html>502 Bad Gateway</html>");

        var ex = await Assert.ThrowsAsync<SchClassOpenApiException>(() => VClass(handler).GetVClassListAsync("S001"));

        Assert.Contains("解析失败", ex.Message);
    }

    [Fact]
    public async Task 兼容行键名_大小写与Java侧put顺序一致()
    {
        var handler = FakeHandler.Json(HttpStatusCode.OK,
            """[{"SchSerID":"S001","TeaTel":"13800000000","TeaName":"王老师","UserTeaSerID":77}]""");

        var rows = await new SchClassDbClassClient(new HttpClient(handler), Options).GetSchteaListAsync(1);

        Assert.Equal(new[] { "SchSerID", "TeaTel", "TeaName", "UserTeaSerID" }, rows[0].Keys);
        Assert.Equal("王老师", rows[0]["TeaName"].GetString());
    }
}