// <copyright file="ScmEventMapperTests.cs" company="Stella Operations">
// Copyright (c) Stella Operations. Licensed under BUSL-1.1.
// </copyright>

using System.Text.Json;
using StellaOps.Signals.Scm.Models;
using StellaOps.Signals.Scm.Webhooks;
using Xunit;

namespace StellaOps.Signals.Tests.Scm;

/// <summary>
/// Unit tests for SCM event mappers.
/// @sprint SPRINT_20251229_013_SIGNALS_scm_ci_connectors
/// </summary>
public sealed class ScmEventMapperTests
{
    #region GitHub Event Mapper Tests

    [Fact]
    public void GitHubMapper_PushEvent_MapsCorrectly()
    {
        // Arrange
        var mapper = new GitHubEventMapper();
        var payload = CreateGitHubPushPayload();

        // Act
        var result = mapper.Map("push", "delivery-123", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmProvider.GitHub, result.Provider);
        Assert.Equal(ScmEventType.Push, result.EventType);
        Assert.Equal("delivery-123", result.EventId);
        Assert.Equal("refs/heads/main", result.Ref);
        Assert.NotNull(result.Repository);
        Assert.Equal("owner/repo", result.Repository.FullName);
    }

    [Fact]
    public void GitHubMapper_PullRequestMergedEvent_MapsCorrectly()
    {
        // Arrange
        var mapper = new GitHubEventMapper();
        var payload = CreateGitHubPrMergedPayload();

        // Act
        var result = mapper.Map("pull_request", "delivery-456", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmProvider.GitHub, result.Provider);
        Assert.Equal(ScmEventType.PullRequestMerged, result.EventType);
        Assert.NotNull(result.PullRequest);
        Assert.Equal(42, result.PullRequest.Number);
        Assert.Equal("closed", result.PullRequest.State);
    }

    [Fact]
    public void GitHubMapper_ReleaseEvent_MapsCorrectly()
    {
        // Arrange
        var mapper = new GitHubEventMapper();
        var payload = CreateGitHubReleasePayload();

        // Act
        var result = mapper.Map("release", "delivery-789", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmProvider.GitHub, result.Provider);
        Assert.Equal(ScmEventType.ReleasePublished, result.EventType);
        Assert.NotNull(result.Release);
        Assert.Equal("v1.0.0", result.Release.TagName);
    }

    [Fact]
    public void GitHubMapper_UnknownEvent_ReturnsUnknownType()
    {
        // Arrange
        var mapper = new GitHubEventMapper();
        var payload = JsonSerializer.SerializeToElement(new { });

        // Act
        var result = mapper.Map("unknown_event", "delivery-000", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmEventType.Unknown, result.EventType);
    }

    #endregion

    #region GitLab Event Mapper Tests

    [Fact]
    public void GitLabMapper_PushEvent_MapsCorrectly()
    {
        // Arrange
        var mapper = new GitLabEventMapper();
        var payload = CreateGitLabPushPayload();

        // Act
        var result = mapper.Map("Push Hook", "delivery-123", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmProvider.GitLab, result.Provider);
        Assert.Equal(ScmEventType.Push, result.EventType);
        Assert.Equal("refs/heads/main", result.Ref);
    }

    [Fact]
    public void GitLabMapper_MergeRequestEvent_MapsCorrectly()
    {
        // Arrange
        var mapper = new GitLabEventMapper();
        var payload = CreateGitLabMrMergedPayload();

        // Act
        var result = mapper.Map("Merge Request Hook", "delivery-456", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmProvider.GitLab, result.Provider);
        Assert.Equal(ScmEventType.PullRequestMerged, result.EventType);
    }

    #endregion

    #region Gitea Event Mapper Tests

    [Fact]
    public void GiteaMapper_PushEvent_MapsCorrectly()
    {
        // Arrange
        var mapper = new GiteaEventMapper();
        var payload = CreateGiteaPushPayload();

        // Act
        var result = mapper.Map("push", "delivery-123", payload);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(ScmProvider.Gitea, result.Provider);
        Assert.Equal(ScmEventType.Push, result.EventType);
    }

    #endregion

    #region Helper Methods

    private static JsonElement CreateGitHubPushPayload()
    {
        var payload = new
        {
            @ref = "refs/heads/main",
            after = "abc123def456",
            repository = new
            {
                id = 12345,
                full_name = "owner/repo",
                clone_url = "https://github.com/owner/repo.git"
            },
            sender = new
            {
                login = "testuser",
                id = 1
            }
        };
        return JsonSerializer.SerializeToElement(payload);
    }

    private static JsonElement CreateGitHubPrMergedPayload()
    {
        var payload = new
        {
            action = "closed",
            pull_request = new
            {
                number = 42,
                merged = true,
                title = "Test PR",
                head = new { sha = "abc123" },
                @base = new { @ref = "main" }
            },
            repository = new
            {
                id = 12345,
                full_name = "owner/repo"
            }
        };
        return JsonSerializer.SerializeToElement(payload);
    }

    private static JsonElement CreateGitHubReleasePayload()
    {
        var payload = new
        {
            action = "published",
            release = new
            {
                tag_name = "v1.0.0",
                name = "Release 1.0.0",
                draft = false,
                prerelease = false
            },
            repository = new
            {
                id = 12345,
                full_name = "owner/repo"
            }
        };
        return JsonSerializer.SerializeToElement(payload);
    }

    private static JsonElement CreateGitLabPushPayload()
    {
        var payload = new
        {
            @ref = "refs/heads/main",
            after = "abc123def456",
            project = new
            {
                id = 12345,
                path_with_namespace = "group/project",
                git_http_url = "https://gitlab.com/group/project.git"
            },
            user_name = "testuser"
        };
        return JsonSerializer.SerializeToElement(payload);
    }

    private static JsonElement CreateGitLabMrMergedPayload()
    {
        var payload = new
        {
            object_kind = "merge_request",
            object_attributes = new
            {
                iid = 42,
                state = "merged",
                action = "merge",
                title = "Test MR"
            },
            project = new
            {
                id = 12345,
                path_with_namespace = "group/project"
            }
        };
        return JsonSerializer.SerializeToElement(payload);
    }

    private static JsonElement CreateGiteaPushPayload()
    {
        var payload = new
        {
            @ref = "refs/heads/main",
            after = "abc123def456",
            repository = new
            {
                id = 12345,
                full_name = "owner/repo",
                clone_url = "https://gitea.example.com/owner/repo.git"
            },
            sender = new
            {
                login = "testuser"
            }
        };
        return JsonSerializer.SerializeToElement(payload);
    }

    #endregion
}