using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Tiku.Application.Content;
using Tiku.Domain.Content;
using Tiku.Domain.Learning;
using Tiku.Domain.Tenancy;
using Tiku.Infrastructure.Persistence;
using Tiku.IntegrationTests.Api;

namespace Tiku.IntegrationTests.ContentV2;

public sealed class PlatformContentPackageProjectionTests
{
    [Fact]
    public async Task Cell_projection_is_idempotent_and_ignores_out_of_order_packages()
    {
        await using var factory = new ApiTestFactory();
        var fixture = await SeedPackagesAsync(factory);
        using var scope = factory.CreateSystemScope("Apply platform package events to a Cell");
        var service = scope.ServiceProvider.GetRequiredService<IPlatformContentPackageProjectionService>();

        var applied = await service.ApplyAsync(new ApplyPlatformContentPackageCommand(
            fixture.OwnerTenantId,
            fixture.NewPackageVersionId,
            fixture.PackageCode,
            "learning-cell-a",
            2,
            fixture.NewHash));
        var duplicate = await service.ApplyAsync(new ApplyPlatformContentPackageCommand(
            fixture.OwnerTenantId,
            fixture.NewPackageVersionId,
            fixture.PackageCode,
            "learning-cell-a",
            2,
            fixture.NewHash));
        var old = await service.ApplyAsync(new ApplyPlatformContentPackageCommand(
            fixture.OwnerTenantId,
            fixture.OldPackageVersionId,
            fixture.PackageCode,
            "learning-cell-a",
            1,
            fixture.OldHash));

        Assert.Equal(CellPackageApplyStatus.Applied, applied.Status);
        Assert.Equal(CellPackageApplyStatus.Duplicate, duplicate.Status);
        Assert.Equal(CellPackageApplyStatus.IgnoredOutOfOrder, old.Status);

        var conflict = await Assert.ThrowsAsync<ContentV2Exception>(() => service.ApplyAsync(
            new ApplyPlatformContentPackageCommand(
                fixture.OwnerTenantId,
                fixture.OldPackageVersionId,
                fixture.PackageCode,
                "learning-cell-a",
                2,
                fixture.OldHash)));
        Assert.Equal("platform_package_sequence_conflict", conflict.Code);

        var db = scope.ServiceProvider.GetRequiredService<TikuDbContext>();
        var projection = await db.PlatformContentPackageCellProjections.AsNoTracking().SingleAsync();
        Assert.Equal(fixture.NewPackageVersionId, projection.PlatformContentPackageVersionId);
        Assert.Equal(2, projection.EventSequence);
        Assert.Equal(fixture.NewHash, projection.ContentHash);
        Assert.Equal(CellProjectionStatus.Ready, projection.Status);
    }

    private static async Task<PackageFixture> SeedPackagesAsync(ApiTestFactory factory)
    {
        var ownerTenantId = Guid.NewGuid();
        var businessLineId = Guid.NewGuid();
        var curriculumId = Guid.NewGuid();
        var curriculumVersionId = Guid.NewGuid();
        var oldReleaseId = Guid.NewGuid();
        var newReleaseId = Guid.NewGuid();
        var oldPackageVersionId = Guid.NewGuid();
        var newPackageVersionId = Guid.NewGuid();
        var packageCode = "national-math";
        var oldHash = new string('1', 64);
        var newHash = new string('2', 64);
        var now = DateTimeOffset.UtcNow;

        await factory.SeedAsync(
            new Tenant
            {
                Id = ownerTenantId,
                Slug = $"platform-{ownerTenantId:N}",
                Name = "Platform content owner",
                Mode = TenantMode.PlatformOwned
            },
            new BusinessLine
            {
                Id = businessLineId,
                Code = $"business-{businessLineId:N}",
                Name = "Generic exam business"
            },
            new Curriculum
            {
                Id = curriculumId,
                TenantId = ownerTenantId,
                BusinessLineId = businessLineId,
                Code = $"curriculum-{curriculumId:N}",
                Name = "Platform curriculum"
            });
        await factory.SeedAsync(
            new CurriculumVersion
            {
                Id = curriculumVersionId,
                TenantId = ownerTenantId,
                CurriculumId = curriculumId,
                Name = "Platform curriculum V1",
                Status = ContentDefinitionStatus.Published,
                PublishedAt = now
            });
        await factory.SeedAsync(
            new ContentRelease
            {
                Id = oldReleaseId,
                TenantId = ownerTenantId,
                BusinessLineId = businessLineId,
                CurriculumVersionId = curriculumVersionId,
                ReleaseNo = 1,
                Name = "Old release",
                SourceFingerprint = oldHash,
                Status = ContentReleaseStatus.Published,
                PublishedAt = now
            },
            new ContentRelease
            {
                Id = newReleaseId,
                TenantId = ownerTenantId,
                BusinessLineId = businessLineId,
                CurriculumVersionId = curriculumVersionId,
                ReleaseNo = 2,
                Name = "New release",
                SourceFingerprint = newHash,
                Status = ContentReleaseStatus.Published,
                PublishedAt = now
            });
        await factory.SeedAsync(
            new PlatformContentPackageVersion
            {
                Id = oldPackageVersionId,
                TenantId = ownerTenantId,
                PackageCode = packageCode,
                VersionNo = 1,
                BusinessLineId = businessLineId,
                ContentReleaseId = oldReleaseId,
                ContentHash = oldHash,
                Status = PlatformContentPackageStatus.Published,
                PublishedAt = now
            },
            new PlatformContentPackageVersion
            {
                Id = newPackageVersionId,
                TenantId = ownerTenantId,
                PackageCode = packageCode,
                VersionNo = 2,
                BusinessLineId = businessLineId,
                ContentReleaseId = newReleaseId,
                ContentHash = newHash,
                Status = PlatformContentPackageStatus.Published,
                PublishedAt = now
            });

        return new PackageFixture(
            ownerTenantId,
            oldPackageVersionId,
            newPackageVersionId,
            packageCode,
            oldHash,
            newHash);
    }

    private sealed record PackageFixture(
        Guid OwnerTenantId,
        Guid OldPackageVersionId,
        Guid NewPackageVersionId,
        string PackageCode,
        string OldHash,
        string NewHash);
}