using System.Text;
using Ludarium.Application;
using Ludarium.Domain;
using Ludarium.Infrastructure;

namespace Ludarium.IntegrationTests;

public sealed class GameDataVaultFileStoreTests
{
    [Fact]
    public async Task OpaqueRevisionIsHashedIdempotentDownloadableAndDeletable()
    {
        var directory = Path.Combine(Path.GetTempPath(), "ludarium-game-data-" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new GameDataVaultFileStore(directory);
            var gameId = Guid.NewGuid();
            var entryId = Guid.NewGuid();
            var revisionId = Guid.NewGuid();
            var payload = Encoding.ASCII.GetBytes("SYNTHETIC-SAVE\0slot=1\0progress=42");
            var writes = await Task.WhenAll(
                store.SaveAsync(gameId, entryId, revisionId, "slot-1.sav", new MemoryStream(payload),
                    payload.Length, "integration-test", CancellationToken.None),
                store.SaveAsync(gameId, entryId, revisionId, "slot-1.sav", new MemoryStream(payload),
                    payload.Length, "integration-test", CancellationToken.None));
            var revision = writes[0];
            var retried = writes[1];

            Assert.Equal(revision.Sha256, retried.Sha256);
            Assert.Equal(64, revision.Sha256.Length);
            Assert.Single(Directory.EnumerateFiles(directory, "*.bin", SearchOption.AllDirectories));
            var opened = Assert.IsType<StoredGameDataRevision>(await store.OpenAsync(revision, CancellationToken.None));
            await using (opened.Content)
            {
                using var copy = new MemoryStream();
                await opened.Content.CopyToAsync(copy);
                Assert.Equal(payload, copy.ToArray());
            }
            var conflictingPayload = Enumerable.Repeat((byte)0x5A, payload.Length).ToArray();
            await Assert.ThrowsAsync<ResourceConflictException>(() => store.SaveAsync(gameId, entryId,
                revisionId, "slot-1.sav", new MemoryStream(conflictingPayload), conflictingPayload.Length,
                "integration-test", CancellationToken.None));
            Assert.True(store.Delete(revision));
            Assert.Null(await store.OpenAsync(revision, CancellationToken.None));
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Theory]
    [InlineData("MZsynthetic")]
    [InlineData("#!/bin/sh")]
    public async Task ExecutableAndScriptSignaturesAreRejected(string value)
    {
        var directory = Path.Combine(Path.GetTempPath(), "ludarium-game-data-" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new GameDataVaultFileStore(directory);
            var payload = Encoding.ASCII.GetBytes(value);
            await Assert.ThrowsAsync<GameDataVaultValidationException>(() => store.SaveAsync(Guid.NewGuid(),
                Guid.NewGuid(), Guid.NewGuid(), "slot.sav", new MemoryStream(payload), payload.Length,
                "integration-test", CancellationToken.None));
            Assert.Empty(Directory.EnumerateFiles(directory, "*.bin", SearchOption.AllDirectories));
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Fact]
    public async Task SameLengthCorruptionFailsClosedOnOpen()
    {
        var directory = Path.Combine(Path.GetTempPath(), "ludarium-game-data-" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new GameDataVaultFileStore(directory);
            var payload = Encoding.ASCII.GetBytes("SYNTHETIC-SAVE-CONTENT");
            var revision = await store.SaveAsync(Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid(), "slot.sav",
                new MemoryStream(payload), payload.Length, "integration-test", CancellationToken.None);
            var path = Path.Combine(directory, revision.Location.Replace('/', Path.DirectorySeparatorChar));
            await File.WriteAllBytesAsync(path, Enumerable.Repeat((byte)0x41, payload.Length).ToArray());
            await Assert.ThrowsAsync<GameDataIntegrityException>(() => store.OpenAsync(revision, CancellationToken.None));
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Fact]
    public async Task DeclaredOversizeAndNativeExecutableSignaturesAreRejected()
    {
        var directory = Path.Combine(Path.GetTempPath(), "ludarium-game-data-" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new GameDataVaultFileStore(directory);
            await Assert.ThrowsAsync<GameDataVaultValidationException>(() => store.SaveAsync(Guid.NewGuid(),
                Guid.NewGuid(), Guid.NewGuid(), "slot.sav", new MemoryStream([0x01]),
                GameDataVaultFileStore.MaximumBytes + 1, "integration-test", CancellationToken.None));

            byte[][] signatures =
            [
                [0x7F, 0x45, 0x4C, 0x46, 0x00],
                [0xFE, 0xED, 0xFA, 0xCF, 0x00],
                [0xCA, 0xFE, 0xBA, 0xBE, 0x00]
            ];
            foreach (var signature in signatures)
                await Assert.ThrowsAsync<GameDataVaultValidationException>(() => store.SaveAsync(Guid.NewGuid(),
                    Guid.NewGuid(), Guid.NewGuid(), "slot.sav", new MemoryStream(signature), signature.Length,
                    "integration-test", CancellationToken.None));

            Assert.Empty(Directory.EnumerateFiles(directory, "*.bin", SearchOption.AllDirectories));
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Fact]
    public async Task ReconciliationRemovesOnlyAppOwnedIncompleteAndOrphanRevisionFiles()
    {
        var directory = Path.Combine(Path.GetTempPath(), "ludarium-game-data-" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new GameDataVaultFileStore(directory);
            var payload = Encoding.ASCII.GetBytes("SYNTHETIC-SAVE-CONTENT");
            var revision = await store.SaveAsync(Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid(), "slot.sav",
                new MemoryStream(payload), payload.Length, "integration-test", CancellationToken.None);
            var orphan = Path.Combine(directory, "orphan", "revision.bin");
            var uploading = Path.Combine(directory, "orphan", "revision.uploading");
            var unrelated = Path.Combine(directory, "orphan", "operator-note.txt");
            Directory.CreateDirectory(Path.GetDirectoryName(orphan)!);
            await File.WriteAllBytesAsync(orphan, [1, 2, 3]);
            await File.WriteAllBytesAsync(uploading, [4, 5]);
            await File.WriteAllTextAsync(unrelated, "retain");

            var result = store.Reconcile(new HashSet<string>(StringComparer.OrdinalIgnoreCase) { revision.Location });

            Assert.Equal(1, result.RemovedUploads);
            Assert.Equal(1, result.RemovedOrphans);
            Assert.Equal(5, result.ReclaimedBytes);
            Assert.True(File.Exists(Path.Combine(directory, revision.Location.Replace('/', Path.DirectorySeparatorChar))));
            Assert.True(File.Exists(unrelated));
            Assert.False(File.Exists(orphan));
            Assert.False(File.Exists(uploading));
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }
}