using Microsoft.Data.Sqlite;
using ZB.MOM.WW.Auth.Abstractions.ApiKeys;
using ZB.MOM.WW.Auth.ApiKeys.Sqlite;

namespace ZB.MOM.WW.Auth.ApiKeys.SqlServer.Tests.Live;

/// <summary>
/// Live tests for <see cref="SqliteApiKeyStoreImporter"/> — the one-shot per-node SQLite to shared
/// SQL Server copy.
/// </summary>
/// <remarks>
/// Each test owns a throwaway SQL Server schema AND a throwaway SQLite file under the temp
/// directory; both are torn down in <see cref="DisposeAsync"/>, so a failed run leaves nothing
/// behind on a shared database or the developer's disk.
/// </remarks>
[Collection("live-sqlserver")]
public sealed class SqliteApiKeyStoreImporterLiveTests : IAsyncLifetime
{
    private readonly string _schema = LiveSqlServer.NewSchemaName();
    private readonly string _sqlitePath =
        Path.Combine(Path.GetTempPath(), $"zbauth-import-{Guid.NewGuid():N}.db");

    private AuthSqlServerConnectionFactory _factory = null!;
    private SqlServerApiKeyAdminStore _sqlAdmin = null!;
    private SqlServerApiKeyStore _sqlRead = null!;
    private SqlServerApiKeyAuditStore _sqlAudit = null!;
    private SqliteApiKeyStoreImporter _importer = null!;

    /// <inheritdoc />
    public async Task InitializeAsync()
    {
        if (!LiveSqlServer.IsEnabled)
        {
            return;
        }

        _factory = new AuthSqlServerConnectionFactory(LiveSqlServer.OptionsFor(_schema));
        await new SqlServerApiKeyStoreMigrator(_factory).MigrateAsync(CancellationToken.None);
        _sqlAdmin = new SqlServerApiKeyAdminStore(_factory);
        _sqlRead = new SqlServerApiKeyStore(_factory);
        _sqlAudit = new SqlServerApiKeyAuditStore(_factory);
        _importer = new SqliteApiKeyStoreImporter(_factory);
    }

    /// <inheritdoc />
    public async Task DisposeAsync()
    {
        // SQLite pools connections by connection string; the handle must be released before the
        // file can be removed cleanly.
        SqliteConnection.ClearAllPools();

        foreach (string path in new[] { _sqlitePath, _sqlitePath + "-wal", _sqlitePath + "-shm" })
        {
            if (File.Exists(path))
            {
                File.Delete(path);
            }
        }

        await LiveSqlServer.DropSchemaAsync(_schema);
    }

    [SkippableFact]
    public async Task Import_CopiesKeysAndAuditRows_AndReturnsCounts()
    {
        Skip.IfNot(LiveSqlServer.IsEnabled, LiveSqlServer.SkipReason);

        (ApiKeyRecord keyA, ApiKeyRecord keyB) = await SeedSqliteAsync();

        ApiKeyImportResult result = await _importer.ImportAsync(_sqlitePath, CancellationToken.None);

        Assert.True(result.SourceFound);
        Assert.Equal(2, result.KeysInserted);
        Assert.Equal(0, result.KeysSkipped);
        Assert.Equal(3, result.AuditInserted);
        Assert.Equal(0, result.AuditSkipped);

        await AssertRecordMatchesAsync(keyA);
        await AssertRecordMatchesAsync(keyB);

        IReadOnlyList<ApiKeyAuditEntry> audit = await _sqlAudit.ListRecentAsync(10, CancellationToken.None);
        Assert.Equal(3, audit.Count);
        Assert.Contains(audit, e => e.KeyId is null && e.EventType == "auth_failed");
        Assert.Contains(audit, e => e.KeyId == "key-a" && e.EventType == "created");
        Assert.Contains(audit, e => e.KeyId == "key-b" && e.EventType == "created");
    }

    [SkippableFact]
    public async Task Import_Twice_IsIdempotent()
    {
        Skip.IfNot(LiveSqlServer.IsEnabled, LiveSqlServer.SkipReason);

        await SeedSqliteAsync();

        await _importer.ImportAsync(_sqlitePath, CancellationToken.None);
        ApiKeyImportResult second = await _importer.ImportAsync(_sqlitePath, CancellationToken.None);

        Assert.True(second.SourceFound);
        Assert.Equal(0, second.KeysInserted);
        Assert.Equal(2, second.KeysSkipped);
        Assert.Equal(0, second.AuditInserted);
        Assert.Equal(3, second.AuditSkipped);

        Assert.Equal(2, (await _sqlAdmin.ListAsync(CancellationToken.None)).Count);
        Assert.Equal(3, (await _sqlAudit.ListRecentAsync(10, CancellationToken.None)).Count);
    }

    [SkippableFact]
    public async Task Import_UnionsWithExistingRows()
    {
        Skip.IfNot(LiveSqlServer.IsEnabled, LiveSqlServer.SkipReason);

        var lastUsed = new DateTimeOffset(2026, 7, 4, 12, 0, 0, TimeSpan.Zero);
        ApiKeyRecord keyC = SampleRecord("key-c") with { LastUsedUtc = lastUsed };
        await _sqlAdmin.CreateAsync(keyC, CancellationToken.None);

        await SeedSqliteAsync();

        ApiKeyImportResult result = await _importer.ImportAsync(_sqlitePath, CancellationToken.None);

        Assert.Equal(2, result.KeysInserted);
        Assert.Equal(0, result.KeysSkipped);

        IReadOnlyList<ApiKeyListItem> listed = await _sqlAdmin.ListAsync(CancellationToken.None);
        Assert.Equal(
            ["key-a", "key-b", "key-c"],
            listed.Select(k => k.KeyId).OrderBy(k => k, StringComparer.Ordinal));

        // The pre-existing row is untouched — the importer only ever inserts.
        Assert.Equal(lastUsed, Assert.Single(listed, k => k.KeyId == "key-c").LastUsedUtc);
    }

    [SkippableFact]
    public async Task Import_MissingFile_ReturnsZeroWithoutThrowing()
    {
        Skip.IfNot(LiveSqlServer.IsEnabled, LiveSqlServer.SkipReason);

        ApiKeyImportResult result = await _importer.ImportAsync(
            Path.Combine(Path.GetTempPath(), $"zbauth-absent-{Guid.NewGuid():N}.db"),
            CancellationToken.None);

        Assert.False(result.SourceFound);
        Assert.Equal(0, result.KeysInserted);
        Assert.Equal(0, result.KeysSkipped);
        Assert.Equal(0, result.AuditInserted);
        Assert.Equal(0, result.AuditSkipped);
    }

    [SkippableFact]
    public async Task Import_PreV3FileWithoutExpiresColumn_ReadsExpiryAsNull()
    {
        Skip.IfNot(LiveSqlServer.IsEnabled, LiveSqlServer.SkipReason);

        await CreatePreV3SqliteFileAsync();

        ApiKeyImportResult result = await _importer.ImportAsync(_sqlitePath, CancellationToken.None);

        Assert.True(result.SourceFound);
        Assert.Equal(1, result.KeysInserted);

        ApiKeyRecord? found = await _sqlRead.FindByKeyIdAsync("key-old", CancellationToken.None);
        Assert.NotNull(found);
        Assert.Null(found!.ExpiresUtc);
        Assert.Equal("legacy key", found.DisplayName);
        Assert.Equal(new DateTimeOffset(2026, 1, 2, 3, 4, 5, TimeSpan.Zero), found.CreatedUtc);
    }

    // --- helpers ---

    /// <summary>
    /// Seeds the throwaway SQLite file with two keys (one revoked, one with an expiry) and three
    /// audit rows (one of them key-less), then returns the two key records as SQLite holds them.
    /// </summary>
    private async Task<(ApiKeyRecord KeyA, ApiKeyRecord KeyB)> SeedSqliteAsync()
    {
        var sqliteFactory = new AuthSqliteConnectionFactory(_sqlitePath);
        await new SqliteAuthStoreMigrator(sqliteFactory).MigrateAsync(CancellationToken.None);

        var admin = new SqliteApiKeyAdminStore(sqliteFactory);
        var audit = new SqliteApiKeyAuditStore(sqliteFactory);
        var read = new SqliteApiKeyStore(sqliteFactory);

        ApiKeyRecord keyA = SampleRecord("key-a");
        ApiKeyRecord keyB = SampleRecord("key-b") with
        {
            ExpiresUtc = new DateTimeOffset(2027, 3, 1, 0, 0, 0, TimeSpan.Zero),
        };

        await admin.CreateAsync(keyA, CancellationToken.None);
        await admin.CreateAsync(keyB, CancellationToken.None);
        await admin.RevokeAsync("key-a", new DateTimeOffset(2026, 6, 1, 7, 8, 9, TimeSpan.Zero), CancellationToken.None);

        await audit.AppendAsync(
            new ApiKeyAuditEntry("key-a", "created", "10.0.0.1", new DateTimeOffset(2026, 5, 1, 8, 30, 0, TimeSpan.Zero), "by admin"),
            CancellationToken.None);
        await audit.AppendAsync(
            new ApiKeyAuditEntry("key-b", "created", null, new DateTimeOffset(2026, 5, 1, 8, 31, 0, TimeSpan.Zero), null),
            CancellationToken.None);
        await audit.AppendAsync(
            new ApiKeyAuditEntry(null, "auth_failed", "10.0.0.9", new DateTimeOffset(2026, 5, 2, 9, 0, 0, TimeSpan.Zero), "unknown key"),
            CancellationToken.None);

        // Re-read so the assertions compare against exactly what SQLite holds, revocation included.
        ApiKeyRecord storedA = (await read.FindByKeyIdAsync("key-a", CancellationToken.None))!;
        ApiKeyRecord storedB = (await read.FindByKeyIdAsync("key-b", CancellationToken.None))!;

        return (storedA, storedB);
    }

    /// <summary>
    /// Writes a v2-shaped SQLite file by hand — <c>api_keys</c> WITHOUT <c>expires_utc</c> — and
    /// inserts one key row, reproducing a store created before schema v3.
    /// </summary>
    private async Task CreatePreV3SqliteFileAsync()
    {
        await using var connection = new SqliteConnection(
            new SqliteConnectionStringBuilder { DataSource = _sqlitePath }.ToString());
        await connection.OpenAsync();

        await using SqliteCommand ddl = connection.CreateCommand();
        ddl.CommandText = """
            CREATE TABLE api_keys (
                key_id TEXT PRIMARY KEY,
                key_prefix TEXT NOT NULL,
                secret_hash BLOB NOT NULL,
                display_name TEXT NOT NULL,
                scopes TEXT NOT NULL,
                constraints TEXT NULL,
                created_utc TEXT NOT NULL,
                last_used_utc TEXT NULL,
                revoked_utc TEXT NULL
            );
            CREATE TABLE api_key_audit (
                audit_id INTEGER PRIMARY KEY AUTOINCREMENT,
                key_id TEXT NULL,
                event_type TEXT NOT NULL,
                remote_address TEXT NULL,
                created_utc TEXT NOT NULL,
                details TEXT NULL
            );
            """;
        await ddl.ExecuteNonQueryAsync();

        await using SqliteCommand insert = connection.CreateCommand();
        insert.CommandText = """
            INSERT INTO api_keys (
                key_id, key_prefix, secret_hash, display_name, scopes,
                constraints, created_utc, last_used_utc, revoked_utc)
            VALUES ('key-old', 'sbk_old1', $hash, 'legacy key', 'read', NULL, $created, NULL, NULL);
            """;
        insert.Parameters.Add("$hash", SqliteType.Blob).Value = new byte[] { 4, 5, 6 };
        insert.Parameters.AddWithValue(
            "$created", new DateTimeOffset(2026, 1, 2, 3, 4, 5, TimeSpan.Zero).ToString("O"));
        await insert.ExecuteNonQueryAsync();
    }

    private async Task AssertRecordMatchesAsync(ApiKeyRecord expected)
    {
        ApiKeyRecord? actual = await _sqlRead.FindByKeyIdAsync(expected.KeyId, CancellationToken.None);

        Assert.NotNull(actual);
        Assert.Equal(expected.KeyPrefix, actual!.KeyPrefix);
        Assert.True(expected.SecretHash.SequenceEqual(actual.SecretHash));
        Assert.Equal(expected.DisplayName, actual.DisplayName);
        Assert.True(expected.Scopes.SetEquals(actual.Scopes));
        Assert.Equal(expected.ConstraintsJson, actual.ConstraintsJson);
        Assert.Equal(expected.CreatedUtc, actual.CreatedUtc);
        Assert.Equal(expected.LastUsedUtc, actual.LastUsedUtc);
        Assert.Equal(expected.RevokedUtc, actual.RevokedUtc);
        Assert.Equal(expected.ExpiresUtc, actual.ExpiresUtc);
    }

    private static ApiKeyRecord SampleRecord(string keyId) => new(
        KeyId: keyId,
        KeyPrefix: "sbk_ab12",
        SecretHash: [1, 2, 3, 4, 5, 6, 7, 8],
        DisplayName: "Test Key " + keyId,
        Scopes: new HashSet<string>(["read", "write"], StringComparer.Ordinal),
        ConstraintsJson: """{"ipAllow":["10.0.0.0/8"]}""",
        CreatedUtc: new DateTimeOffset(2026, 5, 1, 8, 30, 0, TimeSpan.Zero),
        LastUsedUtc: null,
        RevokedUtc: null);
}