using ClosedXML.Excel;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using Workflow.Application.BuildFlow.Common.Services;
using Workflow.Application.BuildFlow.Exports.Handlers;
using Workflow.Application.BuildFlow.Exports.Queries;
using Workflow.Application.Reliability;
using Workflow.Domain.Entities;
using Workflow.Domain.Enums;
using Xunit;

namespace BuildFlow.Workflow.Tests.Performance;

/// <summary>Excel 导出的 keyset 分页、顺序写入和临时文件清理边界测试。</summary>
[Collection(Reliability.PostgresWorkflowCollection.Name)]
public class OpenXmlExportBoundaryTests(Reliability.PostgresWorkflowFixture fixture)
{
    [Fact]
    public async Task TwelveHundredOneRowsUseThreePagesAndKeepStableOrder()
    {
        await ResetAsync();
        var formId = await SeedFormAsync();
        await SeedRowsAsync(formId, 1_201);
        var interceptor = new CountingExportPageInterceptor();
        await using var db = fixture.CreateDbContext(interceptor);
        var handler = CreateHandler(db, new FormSchemaExcelService(), exportPageSize: 500);
        string? filePath = null;

        try
        {
            var result = await handler.Handle(
                new ExportFormDataQuery(formId),
                CancellationToken.None);
            filePath = result.FilePath;

            interceptor.PageSelectCount.Should().Be(3);
            System.IO.File.Exists(filePath).Should().BeTrue();
            typeof(ExportFormDataResult).GetProperties()
                .Should().NotContain(property => property.PropertyType == typeof(byte[]));
            using var workbook = new XLWorkbook(filePath);
            var worksheet = workbook.Worksheets.First();
            worksheet.LastRowUsed()!.RowNumber().Should().Be(1_202);
            for (var index = 0; index < 1_201; index++)
            {
                worksheet.Cell(index + 2, 1).GetString()
                    .Should().Be($"row-{index:D4}");
            }
        }
        finally
        {
            if (filePath is not null)
            {
                System.IO.File.Delete(filePath);
            }
        }
    }

    [Fact]
    public async Task CancellationDeletesTemporaryExportFile()
    {
        await ResetAsync();
        var formId = await SeedFormAsync();
        using var cts = new CancellationTokenSource();
        var excel = new CancellingExportExcelService(cts);
        await using var db = fixture.CreateDbContext();
        var handler = CreateHandler(db, excel, exportPageSize: 500);

        var act = () => handler.Handle(new ExportFormDataQuery(formId), cts.Token);

        await act.Should().ThrowAsync<OperationCanceledException>();
        excel.OutputPath.Should().NotBeNull();
        System.IO.File.Exists(excel.OutputPath).Should().BeFalse();
    }

    [Fact]
    public async Task WriterFailureDeletesTemporaryExportFile()
    {
        await ResetAsync();
        var formId = await SeedFormAsync();
        var excel = new CancellingExportExcelService(
            exception: new InvalidOperationException("writer failed"));
        await using var db = fixture.CreateDbContext();
        var handler = CreateHandler(db, excel, exportPageSize: 500);

        var act = () => handler.Handle(new ExportFormDataQuery(formId), CancellationToken.None);

        await act.Should().ThrowAsync<InvalidOperationException>();
        excel.OutputPath.Should().NotBeNull();
        System.IO.File.Exists(excel.OutputPath).Should().BeFalse();
    }

    private static ExportFormDataQueryHandler CreateHandler(
        WorkflowDbContext db,
        IFormSchemaExcelService excelService,
        int exportPageSize)
        => new(
            db,
            excelService,
            Options.Create(new WorkflowJobOptions
            {
                Import = new WorkflowJobOptions.ImportJobSection
                {
                    ExportPageSize = exportPageSize,
                },
            }));

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

    private async Task<Guid> SeedFormAsync()
    {
        await using var db = fixture.CreateDbContext();
        var formId = Guid.NewGuid();
        db.FormDefinitions.Add(new FormDefinition
        {
            Id = formId,
            Name = "分页导出测试",
            Code = $"export-{formId:N}",
            Version = 1,
            SchemaJson = Schema,
            Status = FormStatus.Published,
        });
        await db.SaveChangesAsync();
        return formId;
    }

    private async Task SeedRowsAsync(Guid formId, int count)
    {
        await using var db = fixture.CreateDbContext();
        var start = new DateTime(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);
        db.FormData.AddRange(Enumerable.Range(0, count).Select(index => new FormData
        {
            Id = Guid.NewGuid(),
            FormDefinitionId = formId,
            InstanceId = Guid.NewGuid(),
            DataJson = $$"""{"name":"row-{{index:D4}}"}""",
            CreatedAt = start.AddMilliseconds(index),
            UpdatedAt = start.AddMilliseconds(index),
        }));
        await db.SaveChangesAsync();
    }

    private const string Schema = """
    {
      "type": "object",
      "properties": {
        "name": { "type": "string", "title": "名称", "x-component": "Input" }
      }
    }
    """;
}