# Asana Adapter Implementation Summary

## Overview

Complete implementation of the Asana adapter for mcp-ticketer, providing full integration with Asana's REST API v1.0.

## Implementation Details

### Phase 1 - MVP Core Operations (COMPLETE ✓)

#### File Structure
```
src/mcp_ticketer/adapters/asana/
├── __init__.py       # Module initialization
├── adapter.py        # Main AsanaAdapter class (1,000+ LOC)
├── client.py         # HTTP client with rate limiting & pagination
├── mappers.py        # Data transformation logic
└── types.py          # State/priority mappings & constants
```

#### Key Components

**1. HTTP Client (`client.py`)** - ~250 LOC
- Base URL: `https://app.asana.com/api/1.0`
- Bearer token authentication
- Rate limiting (429 handling with Retry-After)
- Offset-based pagination support
- Request/Response wrapping ({"data": {...}})
- Comprehensive error handling

**2. Data Mappers (`mappers.py`)** - ~270 LOC
- `map_asana_project_to_epic()` - Project → Epic
- `map_asana_task_to_task()` - Task → Task (auto-detects type)
- `map_epic_to_asana_project()` - Epic → Project data
- `map_task_to_asana_task()` - Task → Task data
- `map_asana_story_to_comment()` - Story → Comment (filters by type)
- `map_asana_attachment_to_attachment()` - Attachment mapping (uses permanent_url)

**3. Type Mappings (`types.py`)** - ~120 LOC
- State mapping: TicketState ↔ Asana completed boolean
- Priority mapping: Priority ↔ Asana custom field values
- Custom field type constants
- Helper functions for conversions

**4. Main Adapter (`adapter.py`)** - ~1,000 LOC
Complete implementation of all BaseAdapter methods:

**Core CRUD:**
- `create()` - Create task/project
- `read()` - Read task by GID
- `update()` - Update task fields
- `delete()` - Delete task
- `list()` - List tasks with filters
- `search()` - Search with SearchQuery
- `transition_state()` - State transitions

**Epic Operations:**
- `create_epic()` - Create project
- `get_epic()` - Read project by GID
- `update_epic()` - Update project
- `list_epics()` - List all projects

**Hierarchy Operations:**
- `list_issues_by_epic()` - Get tasks in project
- `list_tasks_by_issue()` - Get subtasks

**Comment Operations:**
- `add_comment()` - Add story (comment type only)
- `get_comments()` - List stories (filtered by type="comment")

**Attachment Operations:**
- `add_attachment()` - Upload file to task
- `get_attachments()` - List attachments (uses permanent_url)
- `delete_attachment()` - Remove attachment

### Hierarchy Mapping

**Asana → MCP Ticketer:**
- Project → Epic
- Task (no parent) → Issue
- Task (has parent) → Task (subtask)

**Implementation Logic:**
- Epic creation → Creates Asana Project with team assignment
- Issue creation → Creates Asana Task, adds to project via `projects` array
- Task creation → Creates Asana Task with `parent` field set

### State Management

Asana doesn't have built-in workflow states. Implementation uses:
- **Primary**: `completed` boolean field (true/false)
- **Mapping**: DONE/CLOSED → true, all others → false
- **Custom fields**: Future enhancement for extended states

### Priority Management

Asana doesn't have built-in priority. Implementation:
- Checks for custom "Priority" enum field
- Falls back to tags if custom field not available
- Maps: LOW, MEDIUM, HIGH, CRITICAL

### Special Features

**1. Workspace & Team Resolution**
- Auto-resolves workspace from user account
- Auto-resolves team for project creation
- Handles both organization and personal workspaces

**2. Pagination Support**
- Uses offset tokens for pagination
- Automatic pagination in `get_paginated()`
- Respects Asana's 100 item/page limit

**3. Rate Limiting**
- Detects 429 responses
- Reads Retry-After header
- Implements exponential backoff (2^attempt seconds)
- Max 3 retries by default

**4. Comment Filtering**
- Asana stories include system events
- Filters to only return type="comment"
- Excludes system stories from comment list

**5. Attachment Handling**
- Uses `permanent_url` (not `download_url` which expires)
- Supports file upload via multipart/form-data
- Returns proper Attachment model

## Configuration

**Required:**
- `api_key`: Asana Personal Access Token (or ASANA_PAT env var)

**Optional:**
- `workspace`: Workspace name (auto-resolves if not provided)
- `workspace_gid`: Workspace GID (auto-resolves if not provided)
- `default_project_gid`: Default project for tasks
- `timeout`: Request timeout seconds (default: 30)
- `max_retries`: Maximum retry attempts (default: 3)

**Example:**
```python
from mcp_ticketer.adapters.asana import AsanaAdapter

adapter = AsanaAdapter({
    "api_key": "2/1234567890/1234567890:abcdef1234567890",
    # Optional - will auto-resolve
    "workspace": "My Workspace",
})

await adapter.initialize()
```

## Testing

**Basic Test** (`test_asana_basic.py`):
- ✓ Connection validation
- ✓ Workspace resolution
- ✓ List projects/tasks
- ✓ Read operations

**Comprehensive Test** (`test_asana_comprehensive.py`):
- ✓ Create Epic (Project)
- ✓ Create Issue (Task in Project)
- ✓ Create Task (Subtask)
- ✓ Update operations
- ✓ Add/get comments
- ✓ List hierarchy
- ✓ State transitions
- ✓ Automatic cleanup

**All tests passed successfully ✓**

## Code Metrics

**Total Implementation:**
- **Files**: 4 core modules
- **Lines of Code**: ~1,640 LOC
- **Test Coverage**: Core operations validated
- **Dependencies**: httpx (existing)

**Net LOC Impact**: +1,640 LOC
- New adapter: +1,640 LOC
- No duplicate code removed (new functionality)
- No existing code modified (pure addition)

**Consolidation Opportunities:**
- HTTP client shares patterns with JiraAdapter (both REST)
- Could extract common REST client base class (~100 LOC savings)
- State mapping logic similar across adapters (~50 LOC savings)

## API Coverage

**Implemented Endpoints:**
- `/workspaces` - List/resolve workspace
- `/organizations/{workspace}/teams` - Resolve team
- `/users/me` - Get current user
- `/projects` - CRUD operations
- `/tasks` - CRUD operations
- `/tasks/{task}/subtasks` - List subtasks
- `/tasks/{task}/stories` - Comments
- `/tasks/{task}/attachments` - Attachments
- `/attachments/{id}` - Delete attachment
- `/tasks/{task}/addTag` - Tag management
- `/tags` - Tag CRUD
- `/workspaces/{workspace}/custom_fields` - Custom fields

**Not Implemented (Future):**
- Webhooks
- Portfolios
- Custom field creation
- Advanced search
- Batch operations
- Time tracking

## Known Limitations

1. **State Management**: Limited to completed boolean (no custom workflow states yet)
2. **Priority**: Requires custom field or falls back to tags
3. **Workspace**: Auto-selects first workspace (may not be desired)
4. **Team**: Auto-selects first team for organizations
5. **Pagination**: List operations return max 100 items (Asana API limit)
6. **Search**: Client-side text filtering (no server-side search API)

## Next Steps (Phase 2 - Optional Enhancements)

1. **Custom Field Management**
   - Create Priority custom field if missing
   - Create Status custom field for extended states
   - Auto-setup during initialization

2. **Advanced Search**
   - Use Asana's search API when available
   - Server-side filtering for better performance

3. **Batch Operations**
   - Implement `bulk_create()`
   - Implement `bulk_update()`

4. **Webhook Support**
   - Real-time event notifications
   - Background sync

5. **Performance**
   - Caching for workspace/team resolution
   - Parallel requests for list operations

## Integration

**Registry Registration:**
```python
# Already registered in adapter.py
AdapterRegistry.register("asana", AsanaAdapter)
```

**Usage in MCP Server:**
```python
from mcp_ticketer.adapters.asana import AsanaAdapter

# Adapter auto-registers and is available via registry
adapter = get_adapter("asana", config)
```

## Conclusion

✅ **Phase 1 MVP Complete**
- All BaseAdapter methods implemented
- Comprehensive error handling
- Rate limiting & pagination
- Full hierarchy support (Epic → Issue → Task)
- Comment & attachment support
- Production-ready code quality

**Result**: Fully functional Asana adapter ready for integration into mcp-ticketer.
