# Task Management (tm) Package

The `tm` package provides a comprehensive task management system with support for task dependencies, ownership, and various task states.

## Overview

This package defines interfaces and types for managing tasks in a system where:
- Each task has a single owner
- Tasks can be in various states (todo, in progress, completed, etc.)
- Tasks have priorities and due dates

## Core Components

### Types (`types.go`)

- **Task**: The main task entity with all task properties
- **TaskStatus**: Enum for task states (in progress, completed, etc.)
- **TaskPriority**: Enum for task priorities (low, medium, high, urgent)
- **Owner**: Represents a task owner

- **TaskFilter**: For filtering task queries
- **Request/Response types**: For API operations

### Interfaces (`interface.go`)

#### TaskManager
The main interface for task management operations:
- CRUD operations for tasks
- Task status management (start, complete)
- Task queries and filtering
- Task archiving

### Errors (`errors.go`)

Comprehensive error definitions:
- Common task management errors
- Task-specific errors with context

## Key Features

### Task States
- **To Do**: Task is created but not started
- **In Progress**: Task is currently being worked on
- **Completed**: Task is finished
- **Archived**: Task is archived (soft delete)

### Task Priorities
- **Low**: Low priority tasks
- **Medium**: Normal priority tasks
- **High**: High priority tasks

### Filtering and Queries
- Filter by owner, status, priority
- Filter by date ranges
- Pagination support

## Usage Example

```go
// Create a task manager implementation
var taskManager tm.TaskManager

// Create a new task
task, err := taskManager.CreateTask(ctx, &tm.TaskCreateRequest{
    Title:       "Implement user authentication",
    Description: "Add login and registration functionality",
    OwnerID:     "user123",
    Priority:    tm.PriorityHigh,
})

// Start a task
task, err = taskManager.StartTask(ctx, "task1")

// Complete a task
task, err = taskManager.CompleteTask(ctx, "task1")
```