using System.IO;
using JdeScoping.ConfigManager.Services.SecureStore;

namespace JdeScoping.ConfigManager.Tests.Services.SecureStore;

public class SecureStoreManagerTests : IDisposable
{
    private readonly string _testDirectory;
    private readonly SecureStoreManager _sut;

    public SecureStoreManagerTests()
    {
        _testDirectory = Path.Combine(Path.GetTempPath(), $"SecureStoreTests_{Guid.NewGuid():N}");
        Directory.CreateDirectory(_testDirectory);
        _sut = new SecureStoreManager();
    }

    public void Dispose()
    {
        _sut.Dispose();
        if (Directory.Exists(_testDirectory))
        {
            Directory.Delete(_testDirectory, recursive: true);
        }
    }

    [Fact]
    public void IsStoreOpen_WhenNoStoreOpen_ReturnsFalse()
    {
        _sut.IsStoreOpen.ShouldBeFalse();
    }

    [Fact]
    public void CurrentStorePath_WhenNoStoreOpen_ReturnsNull()
    {
        _sut.CurrentStorePath.ShouldBeNull();
    }

    [Fact]
    public void HasUnsavedChanges_WhenNoStoreOpen_ReturnsFalse()
    {
        _sut.HasUnsavedChanges.ShouldBeFalse();
    }

    [Fact]
    public void CreateStore_WithKeyFile_CreatesStoreAndKeyFile()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");

        // Act
        _sut.CreateStore(storePath, keyPath);

        // Assert
        _sut.IsStoreOpen.ShouldBeTrue();
        _sut.CurrentStorePath.ShouldBe(storePath);
        File.Exists(storePath).ShouldBeTrue();
        File.Exists(keyPath).ShouldBeTrue();
    }

    [Fact]
    public void OpenStore_WithValidKeyFile_OpensStore()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.CloseStore();

        // Act
        _sut.OpenStore(storePath, keyPath);

        // Assert
        _sut.IsStoreOpen.ShouldBeTrue();
        _sut.CurrentStorePath.ShouldBe(storePath);
    }

    [Fact]
    public void OpenStore_WithNonExistentStore_ThrowsFileNotFoundException()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "nonexistent.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");

        // Act & Assert
        Should.Throw<FileNotFoundException>(() => _sut.OpenStore(storePath, keyPath));
    }

    [Fact]
    public void CloseStore_ClosesOpenStore()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);

        // Act
        _sut.CloseStore();

        // Assert
        _sut.IsStoreOpen.ShouldBeFalse();
        _sut.CurrentStorePath.ShouldBeNull();
    }

    [Fact]
    public void SetSecret_AddsSecretAndMarksUnsaved()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.Save(); // Save to clear unsaved flag

        // Act
        _sut.SetSecret("testKey", "testValue");

        // Assert
        _sut.HasUnsavedChanges.ShouldBeTrue();
        _sut.GetKeys().ShouldContain("testKey");
    }

    [Fact]
    public void GetSecret_ReturnsCorrectValue()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("testKey", "testValue");

        // Act
        var value = _sut.GetSecret("testKey");

        // Assert
        value.ShouldBe("testValue");
    }

    [Fact]
    public void GetSecret_WhenKeyNotFound_ThrowsKeyNotFoundException()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);

        // Act & Assert
        Should.Throw<KeyNotFoundException>(() => _sut.GetSecret("nonexistent"));
    }

    [Fact]
    public void RemoveSecret_RemovesSecretAndMarksUnsaved()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("testKey", "testValue");
        _sut.Save();

        // Act
        _sut.RemoveSecret("testKey");

        // Assert
        _sut.HasUnsavedChanges.ShouldBeTrue();
        _sut.GetKeys().ShouldNotContain("testKey");
    }

    [Fact]
    public void RemoveSecret_WhenKeyNotFound_ThrowsKeyNotFoundException()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);

        // Act & Assert
        Should.Throw<KeyNotFoundException>(() => _sut.RemoveSecret("nonexistent"));
    }

    [Fact]
    public void Save_PersistsSecretsToStore()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("testKey", "testValue");

        // Act
        _sut.Save();
        _sut.CloseStore();
        _sut.OpenStore(storePath, keyPath);

        // Assert
        _sut.GetKeys().ShouldContain("testKey");
        _sut.GetSecret("testKey").ShouldBe("testValue");
    }

    [Fact]
    public void Save_ClearsUnsavedChangesFlag()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("testKey", "testValue");
        _sut.HasUnsavedChanges.ShouldBeTrue();

        // Act
        _sut.Save();

        // Assert
        _sut.HasUnsavedChanges.ShouldBeFalse();
    }

    [Fact]
    public void GetKeys_ReturnsAllSecretKeys()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("key1", "value1");
        _sut.SetSecret("key2", "value2");
        _sut.SetSecret("key3", "value3");

        // Act
        var keys = _sut.GetKeys();

        // Assert
        keys.Count.ShouldBe(3);
        keys.ShouldContain("key1");
        keys.ShouldContain("key2");
        keys.ShouldContain("key3");
    }

    [Fact]
    public void GenerateKeyFile_CreatesNewKeyFile()
    {
        // Arrange
        var keyPath = Path.Combine(_testDirectory, "generated.key");

        // Act
        _sut.GenerateKeyFile(keyPath);

        // Assert
        File.Exists(keyPath).ShouldBeTrue();
    }

    [Fact]
    public void ExportKey_WhenNoStoreOpen_ThrowsInvalidOperationException()
    {
        // Arrange
        var keyPath = Path.Combine(_testDirectory, "export.key");

        // Act & Assert
        Should.Throw<InvalidOperationException>(() => _sut.ExportKey(keyPath));
    }

    [Fact]
    public void ExportKey_WhenStoreOpen_ExportsKey()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        var exportPath = Path.Combine(_testDirectory, "export.key");
        _sut.CreateStore(storePath, keyPath);

        // Act
        _sut.ExportKey(exportPath);

        // Assert
        File.Exists(exportPath).ShouldBeTrue();
    }

    [Fact]
    public void GetKeys_WhenNoStoreOpen_ThrowsInvalidOperationException()
    {
        // Act & Assert
        Should.Throw<InvalidOperationException>(() => _sut.GetKeys());
    }

    [Fact]
    public void SetSecret_WhenNoStoreOpen_ThrowsInvalidOperationException()
    {
        // Act & Assert
        Should.Throw<InvalidOperationException>(() => _sut.SetSecret("key", "value"));
    }

    [Fact]
    public void GetSecret_WhenNoStoreOpen_ThrowsInvalidOperationException()
    {
        // Act & Assert
        Should.Throw<InvalidOperationException>(() => _sut.GetSecret("key"));
    }

    [Fact]
    public void EnsureAllRequiredEntries_AddsMissingKeys()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("existingKey", "existingValue");
        _sut.Save();

        // Act
        var addedKeys = _sut.EnsureAllRequiredEntries(
            new[] { "existingKey", "newKey1" },
            new[] { "LotFinder", "JDE" });

        // Assert
        addedKeys.Count.ShouldBe(3);
        addedKeys.ShouldContain("newKey1");
        addedKeys.ShouldContain("LotFinder");
        addedKeys.ShouldContain("JDE");
        addedKeys.ShouldNotContain("existingKey");

        // Verify all keys exist
        _sut.GetKeys().ShouldContain("existingKey");
        _sut.GetKeys().ShouldContain("newKey1");
        _sut.GetKeys().ShouldContain("LotFinder");
        _sut.GetKeys().ShouldContain("JDE");
    }

    [Fact]
    public void EnsureAllRequiredEntries_CreatesEmptyValues()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);

        // Act
        _sut.EnsureAllRequiredEntries(
            new[] { "newKey" },
            Array.Empty<string>());

        // Assert
        _sut.GetSecret("newKey").ShouldBe(string.Empty);
    }

    [Fact]
    public void EnsureAllRequiredEntries_DoesNotOverwriteExistingValues()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("existingKey", "originalValue");
        _sut.Save();

        // Act
        var addedKeys = _sut.EnsureAllRequiredEntries(
            new[] { "existingKey" },
            Array.Empty<string>());

        // Assert
        addedKeys.ShouldBeEmpty(); // Key already existed
        _sut.GetSecret("existingKey").ShouldBe("originalValue"); // Value preserved
    }

    [Fact]
    public void EnsureAllRequiredEntries_AutoSavesWhenKeysAdded()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);

        // Act
        _sut.EnsureAllRequiredEntries(
            new[] { "newKey" },
            Array.Empty<string>());

        // Assert - should auto-save (HasUnsavedChanges should be false after calling EnsureAllRequiredEntries)
        _sut.HasUnsavedChanges.ShouldBeFalse();

        // Verify persistence
        _sut.CloseStore();
        _sut.OpenStore(storePath, keyPath);
        _sut.GetKeys().ShouldContain("newKey");
    }

    [Fact]
    public void EnsureAllRequiredEntries_ReturnsEmptyList_WhenNoMissingKeys()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);
        _sut.SetSecret("key1", "value1");
        _sut.SetSecret("key2", "value2");
        _sut.Save();

        // Act
        var addedKeys = _sut.EnsureAllRequiredEntries(
            new[] { "key1" },
            new[] { "key2" });

        // Assert
        addedKeys.ShouldBeEmpty();
    }

    [Fact]
    public void EnsureAllRequiredEntries_WhenNoStoreOpen_ThrowsInvalidOperationException()
    {
        // Act & Assert
        Should.Throw<InvalidOperationException>(() => _sut.EnsureAllRequiredEntries(
            new[] { "key" },
            Array.Empty<string>()));
    }

    [Fact]
    public void EnsureAllRequiredEntries_HandlesDuplicatesAcrossLists()
    {
        // Arrange
        var storePath = Path.Combine(_testDirectory, "test.json");
        var keyPath = Path.Combine(_testDirectory, "test.key");
        _sut.CreateStore(storePath, keyPath);

        // Act - same key in both lists should not cause issues
        var addedKeys = _sut.EnsureAllRequiredEntries(
            new[] { "sharedKey" },
            new[] { "sharedKey" });

        // Assert - should only add once
        addedKeys.Count.ShouldBe(1);
        addedKeys.ShouldContain("sharedKey");
    }
}