namespace MBN_STOCK_WEBVIEW.Playout.Tests;

public sealed class PlayoutOptionsLoaderTests
{
    private static readonly string[] EnvironmentNames =
    [
        "MBN_STOCK_PLAYOUT_MODE",
        "MBN_STOCK_PLAYOUT_HOST",
        "MBN_STOCK_PLAYOUT_PORT",
        "MBN_STOCK_PLAYOUT_TCP_MODE",
        "MBN_STOCK_PLAYOUT_CLIENT_PORT",
        "MBN_STOCK_PLAYOUT_OUTPUT_CHANNEL",
        "MBN_STOCK_PLAYOUT_LAYOUT_INDEX",
        "MBN_STOCK_PLAYOUT_SCENE_DIRECTORY",
        "MBN_STOCK_PLAYOUT_TEST_WINDOW_TITLE_PATTERN",
        "MBN_STOCK_PLAYOUT_QUEUE_CAPACITY",
        "MBN_STOCK_PLAYOUT_CONNECT_TIMEOUT_MS",
        "MBN_STOCK_PLAYOUT_OPERATION_TIMEOUT_MS",
        "MBN_STOCK_PLAYOUT_DISCONNECT_TIMEOUT_MS",
        "MBN_STOCK_PLAYOUT_PROCESS_POLL_INTERVAL_MS",
        "MBN_STOCK_PLAYOUT_RECONNECT_DELAY_MS",
        "MBN_STOCK_PLAYOUT_MAXIMUM_RECONNECT_ATTEMPTS",
        "MBN_STOCK_PLAYOUT_RECONNECT_ENABLED",
        PlayoutOptionsLoader.LiveAuthorizationEnvironmentVariable,
        "MBN_STOCK_PLAYOUT_TEST_SCENE_ALLOWLIST",
        "MBN_STOCK_PLAYOUT_TRUSTED_LIVE_OUTPUT_ENABLED"
    ];

    [Fact]
    public void Load_WhenFileIsMissing_UsesSafeDryRunDefaults()
    {
        using var environment = ClearedEnvironment();
        using var file = TemporaryJsonFile.Missing();

        var options = PlayoutOptionsLoader.Load(file.Path);

        Assert.Equal(PlayoutMode.DryRun, options.Mode);
        Assert.Equal("127.0.0.1", options.Host);
        Assert.Equal(30001, options.Port);
        Assert.Equal(1, options.TcpMode);
        Assert.Equal(0, options.ClientPort);
        Assert.Null(options.OutputChannel);
        Assert.Null(options.SceneDirectory);
        Assert.Empty(options.TestSceneAllowlist);
        Assert.False(options.TrustedLiveOutputEnabled);
        Assert.True(options.ReconnectEnabled);
    }

    [Fact]
    public void Load_EnvironmentOverridesJson_ExceptFileOnlySafetyGates()
    {
        using var environment = ClearedEnvironment()
            .Set("MBN_STOCK_PLAYOUT_MODE", "DryRun")
            .Set("MBN_STOCK_PLAYOUT_HOST", "env-host")
            .Set("MBN_STOCK_PLAYOUT_PORT", "32001")
            .Set("MBN_STOCK_PLAYOUT_TCP_MODE", "2")
            .Set("MBN_STOCK_PLAYOUT_CLIENT_PORT", "32002")
            .Set("MBN_STOCK_PLAYOUT_OUTPUT_CHANNEL", "12")
            .Set("MBN_STOCK_PLAYOUT_LAYOUT_INDEX", "13")
            .Set("MBN_STOCK_PLAYOUT_SCENE_DIRECTORY", "C:\\env-scenes")
            .Set("MBN_STOCK_PLAYOUT_TEST_WINDOW_TITLE_PATTERN", "ENV TEST")
            .Set("MBN_STOCK_PLAYOUT_QUEUE_CAPACITY", "14")
            .Set("MBN_STOCK_PLAYOUT_CONNECT_TIMEOUT_MS", "1501")
            .Set("MBN_STOCK_PLAYOUT_OPERATION_TIMEOUT_MS", "1502")
            .Set("MBN_STOCK_PLAYOUT_DISCONNECT_TIMEOUT_MS", "1503")
            .Set("MBN_STOCK_PLAYOUT_PROCESS_POLL_INTERVAL_MS", "1504")
            .Set("MBN_STOCK_PLAYOUT_RECONNECT_DELAY_MS", "1505")
            .Set("MBN_STOCK_PLAYOUT_MAXIMUM_RECONNECT_ATTEMPTS", "4")
            .Set("MBN_STOCK_PLAYOUT_RECONNECT_ENABLED", "false")
            .Set("MBN_STOCK_PLAYOUT_TEST_SCENE_ALLOWLIST", "C:\\env\\must-not-apply.t2s")
            .Set("MBN_STOCK_PLAYOUT_TRUSTED_LIVE_OUTPUT_ENABLED", "false");
        using var file = TemporaryJsonFile.Create(
            """
            {
              "mode": "Test",
              "host": "json-host",
              "port": 31001,
              "tcpMode": 1,
              "clientPort": 31002,
              "outputChannel": 3,
              "layoutIndex": 10,
              "sceneDirectory": "C:\\json-scenes",
              "testProcessWindowTitlePattern": "JSON TEST",
              "testSceneAllowlist": ["C:\\test-scenes\\allowed.t2s"],
              "trustedLiveOutputEnabled": true,
              "queueCapacity": 64,
              "connectTimeoutMilliseconds": 5000,
              "operationTimeoutMilliseconds": 5000,
              "disconnectTimeoutMilliseconds": 3000,
              "processPollIntervalMilliseconds": 1000,
              "reconnectDelayMilliseconds": 1000,
              "maximumReconnectAttempts": 3,
              "reconnectEnabled": true
            }
            """);

        var options = PlayoutOptionsLoader.Load(file.Path);

        Assert.Equal(PlayoutMode.DryRun, options.Mode);
        Assert.Equal("env-host", options.Host);
        Assert.Equal(32001, options.Port);
        Assert.Equal(2, options.TcpMode);
        Assert.Equal(32002, options.ClientPort);
        Assert.Equal(12, options.OutputChannel);
        Assert.Equal(13, options.LayoutIndex);
        Assert.Equal("C:\\env-scenes", options.SceneDirectory);
        Assert.Equal("ENV TEST", options.TestProcessWindowTitlePattern);
        Assert.Equal(14, options.QueueCapacity);
        Assert.Equal(1501, options.ConnectTimeoutMilliseconds);
        Assert.Equal(1502, options.OperationTimeoutMilliseconds);
        Assert.Equal(1503, options.DisconnectTimeoutMilliseconds);
        Assert.Equal(1504, options.ProcessPollIntervalMilliseconds);
        Assert.Equal(1505, options.ReconnectDelayMilliseconds);
        Assert.Equal(4, options.MaximumReconnectAttempts);
        Assert.False(options.ReconnectEnabled);
        Assert.Equal(["C:\\test-scenes\\allowed.t2s"], options.TestSceneAllowlist);
        Assert.True(options.TrustedLiveOutputEnabled);
    }

    [Fact]
    public void Load_InvalidJson_ReturnsOnlySafeConfigurationMessage()
    {
        using var environment = ClearedEnvironment();
        using var file = TemporaryJsonFile.Create("{ invalid-json: true }");

        var exception = Assert.Throws<PlayoutConfigurationException>(
            () => PlayoutOptionsLoader.Load(file.Path));

        Assert.Equal("송출 설정 파일 형식이 올바르지 않습니다.", exception.Message);
        Assert.DoesNotContain(file.Path, exception.Message, StringComparison.OrdinalIgnoreCase);
        Assert.DoesNotContain("invalid-json", exception.Message, StringComparison.OrdinalIgnoreCase);
    }

    [Theory]
    [InlineData("MBN_STOCK_PLAYOUT_MODE", "not-a-mode")]
    [InlineData("MBN_STOCK_PLAYOUT_PORT", "not-a-number")]
    [InlineData("MBN_STOCK_PLAYOUT_RECONNECT_ENABLED", "not-a-bool")]
    public void Load_InvalidEnvironmentValue_IdentifiesVariableWithoutLeakingValue(
        string name,
        string invalidValue)
    {
        using var environment = ClearedEnvironment().Set(name, invalidValue);
        using var file = TemporaryJsonFile.Missing();

        var exception = Assert.Throws<PlayoutConfigurationException>(
            () => PlayoutOptionsLoader.Load(file.Path));

        Assert.Contains(name, exception.Message, StringComparison.Ordinal);
        Assert.DoesNotContain(invalidValue, exception.Message, StringComparison.Ordinal);
    }

    private static EnvironmentScope ClearedEnvironment()
    {
        var result = new EnvironmentScope();
        foreach (var name in EnvironmentNames)
        {
            result.Set(name, null);
        }

        return result;
    }
}