using BuildFlow.Workflow.Tests.Reliability;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using System.Text.Json.Nodes;
using Workflow.Application.Form.Aggregates;
using Workflow.Domain.Entities;
using Workflow.Domain.Enums;
using Xunit;

namespace BuildFlow.Workflow.Tests.Performance;

/// <summary>
/// 表单聚合刷新查询次数门禁，避免目标行和统计字段触发 N+1。
/// </summary>
[Collection(PostgresWorkflowCollection.Name)]
public class FormAggregateQueryCountTests(PostgresWorkflowFixture fixture)
{
    [Fact]
    public async Task AggregateRefreshUsesConstantSelectCountForManyRowsAndFields()
    {
        await ResetAsync();
        var targetFormId = Guid.NewGuid();
        var sourceFormId = Guid.NewGuid();
        var instanceId = Guid.NewGuid();
        await using (var seed = fixture.CreateDbContext())
        {
            seed.FormDefinitions.AddRange(
                new FormDefinition
                {
                    Id = targetFormId,
                    Name = "费用汇总",
                    Code = "expense-main",
                    Version = 1,
                    Status = FormStatus.Published,
                    SchemaJson = AggregateSchema,
                },
                new FormDefinition
                {
                    Id = sourceFormId,
                    Name = "费用明细",
                    Code = "expense-line",
                    Version = 1,
                    Status = FormStatus.Published,
                    SchemaJson = """{"type":"object","properties":{}}""",
                });
            seed.WorkflowInstances.Add(new WorkflowInstance
            {
                Id = instanceId,
                DefinitionId = Guid.NewGuid(),
                DefinitionVersion = 1,
                Title = "聚合查询计数",
                Status = InstanceStatus.Running,
                InitiatorId = Guid.NewGuid(),
                Variables = "{}",
            });

            for (var i = 0; i < 10; i++)
            {
                seed.FormData.Add(new global::Workflow.Domain.Entities.FormData
                {
                    Id = Guid.NewGuid(),
                    FormDefinitionId = targetFormId,
                    InstanceId = instanceId,
                    DataJson = $$"""{"requestId":"REQ-{{i}}","lineTotal":0,"lineCount":0}""",
                });
                seed.FormData.AddRange(
                    CreateSourceRow(sourceFormId, instanceId, i, 10),
                    CreateSourceRow(sourceFormId, instanceId, i, 20));
            }

            await seed.SaveChangesAsync();
        }

        var interceptor = new CountingCommandInterceptor();
        await using (var db = fixture.CreateDbContext(interceptor))
        {
            interceptor.Reset();
            var service = new FormAggregateRefreshService(db);

            await service.RefreshAsync(targetFormId, instanceId, CancellationToken.None);

            interceptor.SelectCount.Should().Be(4);
        }

        await using var verify = fixture.CreateDbContext();
        var targetRows = await verify.FormData
            .Where(x => x.FormDefinitionId == targetFormId)
            .ToListAsync();
        targetRows.Should().HaveCount(10);
        targetRows.Should().OnlyContain(x => HasExpectedAggregates(x));
        var instance = await verify.WorkflowInstances.SingleAsync(x => x.Id == instanceId);
        var variables = JsonNode.Parse(instance.Variables!)!.AsObject();
        variables["lineTotal"]!.GetValue<decimal>().Should().Be(30);
        variables["lineCount"]!.GetValue<decimal>().Should().Be(2);
    }

    [Fact]
    public async Task AggregateRefreshSupportsSourceRowsFromTheTargetForm()
    {
        await ResetAsync();
        var formDefinitionId = Guid.NewGuid();
        var instanceId = Guid.NewGuid();
        await using (var seed = fixture.CreateDbContext())
        {
            seed.FormDefinitions.Add(new FormDefinition
            {
                Id = formDefinitionId,
                Name = "自聚合表单",
                Code = "self-aggregate",
                Version = 1,
                Status = FormStatus.Published,
                SchemaJson = SelfAggregateSchema,
            });
            seed.FormData.AddRange(
                new global::Workflow.Domain.Entities.FormData
                {
                    Id = Guid.NewGuid(),
                    FormDefinitionId = formDefinitionId,
                    InstanceId = instanceId,
                    DataJson = """{"requestId":"A","amount":10,"total":0}""",
                },
                new global::Workflow.Domain.Entities.FormData
                {
                    Id = Guid.NewGuid(),
                    FormDefinitionId = formDefinitionId,
                    InstanceId = instanceId,
                    DataJson = """{"requestId":"B","amount":20,"total":0}""",
                });
            await seed.SaveChangesAsync();
        }

        await using (var db = fixture.CreateDbContext())
        {
            var service = new FormAggregateRefreshService(db);
            await service.RefreshAsync(formDefinitionId, instanceId, CancellationToken.None);
        }

        await using var verify = fixture.CreateDbContext();
        var rows = await verify.FormData
            .Where(x => x.FormDefinitionId == formDefinitionId)
            .ToListAsync();
        rows.Should().Contain(x => HasTotal(x, 10));
        rows.Should().Contain(x => HasTotal(x, 20));
    }

    private async Task ResetAsync()
    {
        await using var db = fixture.CreateDbContext();
        await db.WorkflowTimerJobs.ExecuteDeleteAsync();
        await db.WorkflowTasks.ExecuteDeleteAsync();
        await db.WorkflowTokens.ExecuteDeleteAsync();
        await db.FormData.ExecuteDeleteAsync();
        await db.BuildFlowImportJobs.ExecuteDeleteAsync();
        await db.WorkflowInstances.ExecuteDeleteAsync();
        await db.FormDefinitions.ExecuteDeleteAsync();
    }

    private static global::Workflow.Domain.Entities.FormData CreateSourceRow(
        Guid sourceFormId,
        Guid instanceId,
        int requestIndex,
        int amount)
        => new()
        {
            Id = Guid.NewGuid(),
            FormDefinitionId = sourceFormId,
            InstanceId = instanceId,
            DataJson = $$"""{"requestId":"REQ-{{requestIndex}}","amount":{{amount}}}""",
        };

    private static bool HasExpectedAggregates(
        global::Workflow.Domain.Entities.FormData row)
    {
        var data = JsonNode.Parse(row.DataJson)!.AsObject();
        return data["lineTotal"]!.GetValue<decimal>() == 30
               && data["lineCount"]!.GetValue<decimal>() == 2;
    }

    private static bool HasTotal(
        global::Workflow.Domain.Entities.FormData row,
        decimal expected)
    {
        var data = JsonNode.Parse(row.DataJson)!.AsObject();
        return data["amount"]!.GetValue<decimal>() == expected
               && data["total"]!.GetValue<decimal>() == expected;
    }

    private const string AggregateSchema = """
    {
      "type": "object",
      "properties": {
        "requestId": { "type": "string", "title": "申请编号", "x-component": "Input" },
        "lineTotal": {
          "type": "number",
          "title": "明细总金额",
          "x-component": "InputNumber",
          "x-field-kind": "aggregate",
          "x-derived": {
            "mode": "aggregate",
            "source": {
              "type": "formData",
              "formDefinitionCode": "expense-line",
              "relationPath": "requestId",
              "relationValuePath": "requestId"
            },
            "aggregate": { "function": "sum", "fieldPath": "amount" }
          }
        },
        "lineCount": {
          "type": "number",
          "title": "明细数量",
          "x-component": "InputNumber",
          "x-field-kind": "aggregate",
          "x-derived": {
            "mode": "aggregate",
            "source": {
              "type": "formData",
              "formDefinitionCode": "expense-line",
              "relationPath": "requestId",
              "relationValuePath": "requestId"
            },
            "aggregate": { "function": "count" }
          }
        }
      }
    }
    """;

    private const string SelfAggregateSchema = """
    {
      "type": "object",
      "properties": {
        "requestId": { "type": "string", "x-component": "Input" },
        "amount": { "type": "number", "x-component": "InputNumber" },
        "total": {
          "type": "number",
          "x-component": "InputNumber",
          "x-field-kind": "aggregate",
          "x-derived": {
            "mode": "aggregate",
            "source": {
              "type": "formData",
              "formDefinitionCode": "self-aggregate",
              "relationPath": "requestId",
              "relationValuePath": "requestId"
            },
            "aggregate": { "function": "sum", "fieldPath": "amount" }
          }
        }
      }
    }
    """;
}