Commit MWS backend source tree

The ASP.NET Core solution (mws.api/mws.application/mws.domain/
mws.infrastructure) existed only as untracked working files. Adding
it to version control, plus a .gitignore for build output and local
tooling directories, so the CQRS/mediator refactor plan has a real
git history to branch and diff against.

mws.application/Tasks/TaskService.cs

@@ -0,0 +1,129 @@
+using AutoMapper;
+using Mws.Application.Common;
+using Mws.Domain.Tasks;
+using TaskPriority = Mws.Domain.Tasks.TaskPriority;
+using TaskStatus = Mws.Domain.Tasks.TaskStatus;
+
+namespace Mws.Application.Tasks;
+
+public class TaskService(IUnitOfWork uow, IMapper mapper) : ITaskService
+{
+    public async Task<List<TaskDto>> GetTasksAsync(Guid userId, Guid projectId, TaskStatus? status, TaskPriority? priority, Guid? assigneeId, CancellationToken ct = default)
+    {
+        await EnsureMemberAccessAsync(userId, projectId, ct);
+
+        var tasks = await uow.Tasks.GetForProjectAsync(projectId, status, priority, assigneeId, ct);
+        return mapper.Map<List<TaskDto>>(tasks);
+    }
+
+    public async Task<TaskDto> GetAsync(Guid userId, Guid taskId, CancellationToken ct = default)
+    {
+        var task = await GetTaskForUserAsync(userId, taskId, ct);
+        return await GetDtoAsync(task.Id, ct);
+    }
+
+    public async Task<TaskDto> CreateAsync(Guid userId, Guid projectId, CreateTaskRequest request, CancellationToken ct = default)
+    {
+        await EnsureMemberAccessAsync(userId, projectId, ct);
+
+        if (string.IsNullOrWhiteSpace(request.Title))
+        {
+            throw new BadRequestException("Task title is required");
+        }
+
+        if (request.AssigneeId.HasValue && !await IsMemberAsync(request.AssigneeId.Value, projectId, ct))
+        {
+            throw new BadRequestException("Assignee must be a member of the project");
+        }
+
+        var now = DateTime.UtcNow;
+        var task = new TaskItem
+        {
+            Id = Guid.NewGuid(),
+            ProjectId = projectId,
+            Title = request.Title.Trim(),
+            Description = request.Description,
+            Status = request.Status ?? TaskStatus.Todo,
+            Priority = request.Priority ?? TaskPriority.Medium,
+            AssigneeId = request.AssigneeId,
+            DueDate = request.DueDate,
+            CreatedBy = userId,
+            CreatedAt = now,
+            UpdatedAt = now,
+        };
+
+        uow.Tasks.Add(task);
+        await uow.SaveChangesAsync(ct);
+        return await GetDtoAsync(task.Id, ct);
+    }
+
+    public async Task<TaskDto> UpdateAsync(Guid userId, Guid taskId, UpdateTaskRequest request, CancellationToken ct = default)
+    {
+        var task = await GetTaskForUserAsync(userId, taskId, ct);
+
+        if (string.IsNullOrWhiteSpace(request.Title))
+        {
+            throw new BadRequestException("Task title is required");
+        }
+
+        if (request.AssigneeId.HasValue && !await IsMemberAsync(request.AssigneeId.Value, task.ProjectId, ct))
+        {
+            throw new BadRequestException("Assignee must be a member of the project");
+        }
+
+        task.Title = request.Title.Trim();
+        task.Description = request.Description;
+        task.Status = request.Status;
+        task.Priority = request.Priority;
+        task.AssigneeId = request.AssigneeId;
+        task.DueDate = request.DueDate;
+        task.UpdatedAt = DateTime.UtcNow;
+
+        await uow.SaveChangesAsync(ct);
+        return await GetDtoAsync(task.Id, ct);
+    }
+
+    public async Task DeleteAsync(Guid userId, Guid taskId, CancellationToken ct = default)
+    {
+        var task = await GetTaskForUserAsync(userId, taskId, ct);
+        uow.Tasks.Remove(task);
+        await uow.SaveChangesAsync(ct);
+    }
+
+    public async Task<List<TaskDto>> SearchAsync(Guid userId, string term, CancellationToken ct = default)
+    {
+        var projectIds = await uow.Projects.GetProjectIdsForUserAsync(userId, ct);
+        var tasks = await uow.Tasks.SearchWithAssigneeAsync(projectIds, term, 20, ct);
+        return mapper.Map<List<TaskDto>>(tasks);
+    }
+
+    private async Task<TaskDto> GetDtoAsync(Guid id, CancellationToken ct)
+    {
+        var task = await uow.Tasks.GetWithAssigneeAsync(id, ct)
+            ?? throw new NotFoundException("Task not found");
+        return mapper.Map<TaskDto>(task);
+    }
+
+    private async Task<TaskItem> GetTaskForUserAsync(Guid userId, Guid taskId, CancellationToken ct = default)
+    {
+        var task = await uow.Tasks.GetByIdAsync(taskId, ct)
+            ?? throw new NotFoundException("Task not found");
+
+        if (!await IsMemberAsync(userId, task.ProjectId, ct))
+        {
+            throw new NotFoundException("Task not found");
+        }
+        return task;
+    }
+
+    private async Task EnsureMemberAccessAsync(Guid userId, Guid projectId, CancellationToken ct = default)
+    {
+        if (!await IsMemberAsync(userId, projectId, ct))
+        {
+            throw new NotFoundException("Project not found");
+        }
+    }
+
+    private Task<bool> IsMemberAsync(Guid userId, Guid projectId, CancellationToken ct = default) =>
+        uow.Projects.IsMemberAsync(projectId, userId, ct);
+}