using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
using ZB.MOM.WW.ScadaBridge.ManagementService;

namespace ZB.MOM.WW.ScadaBridge.ManagementService.Tests;

/// <summary>
/// Tests for <see cref="ManagementEndpoints"/> request-body parsing
/// parsing and Ask-timeout resolution.
/// </summary>
public class ManagementEndpointsTests
{
    /// <summary>Verifies that parsing a request with an explicit payload deserializes into the command type.</summary>
    [Fact]
    public void ParseCommand_WithExplicitPayload_DeserializesIntoCommandType()
    {
        var json = """{ "command": "CreateSite", "payload": { "name": "Site1", "siteIdentifier": "SITE1", "description": "Desc" } }""";

        var result = ManagementEndpoints.ParseCommand(json);

        Assert.True(result.Success);
        var command = Assert.IsType<CreateSiteCommand>(result.Command);
        Assert.Equal("Site1", command.Name);
        Assert.Equal("SITE1", command.SiteIdentifier);
        Assert.Equal("Desc", command.Description);
    }

    /// <summary>
    /// <c>MgmtDeploySiteCommand.Force</c> is an ADDITIVE field, so a client
    /// that predates it — every CLI older than this change, and every scripted
    /// HTTP caller — must keep working and must land on the SAFE default. Absent
    /// means <c>false</c> means "skip instances whose config is unchanged", which
    /// is the non-destructive behaviour; only an explicit <c>true</c> restores the
    /// unconditional redeploy.
    /// </summary>
    /// <param name="json">The management request body to parse.</param>
    /// <param name="expectedForce">The expected value of the command's <c>Force</c> flag.</param>
    [Theory]
    [InlineData("""{ "command": "MgmtDeploySite", "payload": { "siteId": 7 } }""", false)]
    [InlineData("""{ "command": "MgmtDeploySite", "payload": { "siteId": 7, "force": false } }""", false)]
    [InlineData("""{ "command": "MgmtDeploySite", "payload": { "siteId": 7, "force": true } }""", true)]
    public void ParseCommand_DeploySite_ForceDefaultsToTheNonDestructiveBehaviour(string json, bool expectedForce)
    {
        var result = ManagementEndpoints.ParseCommand(json);

        Assert.True(result.Success);
        var command = Assert.IsType<MgmtDeploySiteCommand>(result.Command);
        Assert.Equal(7, command.SiteId);
        Assert.Equal(expectedForce, command.Force);
    }

    /// <summary>Verifies that parsing a request with no payload deserializes a parameterless command.</summary>
    [Fact]
    public void ParseCommand_WithMissingPayload_DeserializesParameterlessCommand()
    {
        // No "payload" field at all -- the fallback must not allocate a throwaway
        // JsonDocument and must still produce a valid parameterless command.
        var json = """{ "command": "ListTemplates" }""";

        var result = ManagementEndpoints.ParseCommand(json);

        Assert.True(result.Success);
        Assert.IsType<ListTemplatesCommand>(result.Command);
    }

    /// <summary>Verifies that parsing invalid JSON returns a failure.</summary>
    [Fact]
    public void ParseCommand_WithInvalidJson_ReturnsFailure()
    {
        var result = ManagementEndpoints.ParseCommand("{ not json");

        Assert.False(result.Success);
        Assert.Equal("BAD_REQUEST", result.ErrorCode);
    }

    /// <summary>Verifies that parsing a request without a command field returns a failure.</summary>
    [Fact]
    public void ParseCommand_WithMissingCommandField_ReturnsFailure()
    {
        var result = ManagementEndpoints.ParseCommand("""{ "payload": {} }""");

        Assert.False(result.Success);
        Assert.Equal("BAD_REQUEST", result.ErrorCode);
    }

    /// <summary>Verifies that parsing an unknown command returns a failure.</summary>
    [Fact]
    public void ParseCommand_WithUnknownCommand_ReturnsFailure()
    {
        var result = ManagementEndpoints.ParseCommand("""{ "command": "NoSuchCommand" }""");

        Assert.False(result.Success);
        Assert.Equal("BAD_REQUEST", result.ErrorCode);
    }

    // ========================================================================
    // Command-timeout configuration
    //
    // ManagementServiceOptions.CommandTimeout must actually drive the Ask
    // timeout instead of a hard-coded 30s constant.
    // ========================================================================

    /// <summary>Verifies that the Ask timeout uses the configured command timeout.</summary>
    [Fact]
    public void ResolveAskTimeout_UsesConfiguredCommandTimeout()
    {
        var options = new ManagementServiceOptions { CommandTimeout = TimeSpan.FromSeconds(75) };

        var timeout = ManagementEndpoints.ResolveAskTimeout(options);

        Assert.Equal(TimeSpan.FromSeconds(75), timeout);
    }

    /// <summary>Verifies that null options fall back to the default Ask timeout.</summary>
    [Fact]
    public void ResolveAskTimeout_WithNullOptions_FallsBackToDefault()
    {
        var timeout = ManagementEndpoints.ResolveAskTimeout(null);

        Assert.Equal(TimeSpan.FromSeconds(30), timeout);
    }

    /// <summary>Verifies that a non-positive configured timeout falls back to the default Ask timeout.</summary>
    [Fact]
    public void ResolveAskTimeout_WithNonPositiveTimeout_FallsBackToDefault()
    {
        // A misconfigured zero/negative timeout would make every Ask fail
        // immediately; fall back to the safe default instead.
        var options = new ManagementServiceOptions { CommandTimeout = TimeSpan.Zero };

        var timeout = ManagementEndpoints.ResolveAskTimeout(options);

        Assert.Equal(TimeSpan.FromSeconds(30), timeout);
    }

    // ========================================================================
    // Per-command long-running Ask timeout (arch-review S1)
    //
    // Transport/deploy commands legitimately run for minutes; they must use the
    // LongRunningCommandTimeout (default 5 min) instead of the 30 s default.
    // ========================================================================

    /// <summary>Verifies that long-running commands use the long Ask timeout.</summary>
    /// <param name="cmd">The long-running command type under test.</param>
    [Theory]
    [InlineData(typeof(ImportBundleCommand))]
    [InlineData(typeof(ExportBundleCommand))]
    [InlineData(typeof(PreviewBundleCommand))]
    [InlineData(typeof(MgmtDeployArtifactsCommand))]
    [InlineData(typeof(MgmtDeployInstanceCommand))]
    public void ResolveAskTimeout_LongRunningCommand_UsesLongTimeout(Type cmd)
        => Assert.Equal(TimeSpan.FromMinutes(5), ManagementEndpoints.ResolveAskTimeout(null, cmd));

    /// <summary>Verifies that an ordinary command uses the default Ask timeout.</summary>
    [Fact]
    public void ResolveAskTimeout_OrdinaryCommand_UsesDefault()
        => Assert.Equal(TimeSpan.FromSeconds(30), ManagementEndpoints.ResolveAskTimeout(null, typeof(ListTemplatesCommand)));

    /// <summary>Verifies that a configured long-running timeout is honored.</summary>
    [Fact]
    public void ResolveAskTimeout_ConfiguredLongTimeout_Honored()
        => Assert.Equal(TimeSpan.FromMinutes(10), ManagementEndpoints.ResolveAskTimeout(
            new ManagementServiceOptions { LongRunningCommandTimeout = TimeSpan.FromMinutes(10) },
            typeof(ImportBundleCommand)));
    /// <summary>Verifies that a bulk Ask timeout leaves a grace period beyond the overall scheduling deadline.</summary>
    [Fact]
    public void BulkAsk_LeavesGraceBeyondOverallSchedulingDeadline()
    {
        var options = new ManagementServiceOptions { LongRunningCommandTimeout = TimeSpan.FromMinutes(2) };
        Assert.Equal(TimeSpan.FromMinutes(3), ManagementEndpoints.ResolveAskTimeout(options, typeof(MgmtDeploySiteCommand)));
    }
}