KeepItGoingServer/API.md

# KeepItGoing REST API Documentation

Complete API documentation for integrating applications with KeepItGoing Server.

**API Version:** 1.0
**Base URL:** `https://yourdomain.com/api`

---

## Table of Contents

- [Authentication](#authentication)
- [Rate Limiting](#rate-limiting)
- [Error Handling](#error-handling)
- [User Management](#user-management)
- [Task Management](#task-management)
- [Tags](#tags)
- [Time Tracking](#time-tracking)
- [Task Sharing](#task-sharing)
- [Sync (Offline-First)](#sync-offline-first)
- [Notifications](#notifications)
- [Common Patterns](#common-patterns)

---

## Authentication

### JWT Token Authentication

All authenticated endpoints require the `Authorization` header:

```
Authorization: Bearer {access_token}
```

### Obtain Access Token

**POST** `/api/users/token/`

Authenticates user and returns JWT tokens. User must have verified email and admin approval.

**Request:**
```json
{
  "username": "user@example.com",
  "password": "password123"
}
```

**Response (200 OK):**
```json
{
  "refresh": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
  "access": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
}
```

**Rate Limit:** 10 requests/hour

### Refresh Access Token

**POST** `/api/users/token/refresh/`

Refreshes an expired access token using a refresh token.

**Request:**
```json
{
  "refresh": "{refresh_token}"
}
```

**Response (200 OK):**
```json
{
  "access": "new_access_token_here"
}
```

**Token Lifetimes:**
- Access token: 60 minutes
- Refresh token: 7 days
- Refresh tokens rotate on each use (old token blacklisted)

---

## Rate Limiting

All endpoints are rate-limited per user:

| User Type | Limit | Scope |
|-----------|-------|-------|
| Anonymous | 100/hour | General API access |
| Authenticated | 1000/hour | General API access |
| Login | 10/hour | Token endpoint |
| Registration | 5/hour | Registration endpoint |
| Sync | 100/hour | Sync endpoint |

**Rate Limit Headers:**
```
X-RateLimit-Limit: 1000
X-RateLimit-Remaining: 999
X-RateLimit-Reset: 1234567890
```

**Rate Limit Exceeded (429):**
```json
{
  "detail": "Request was throttled. Expected available in 120 seconds."
}
```

---

## Error Handling

### HTTP Status Codes

| Code | Meaning |
|------|---------|
| 200 | Successful request |
| 201 | Resource created |
| 204 | Successful deletion (no content) |
| 400 | Invalid request data |
| 401 | Authentication required or invalid |
| 403 | Forbidden (insufficient permissions) |
| 404 | Resource not found |
| 429 | Rate limit exceeded |
| 500 | Server error |

### Error Response Format

```json
{
  "detail": "Error message",
  "field_name": ["Field-specific error message"]
}
```

**Examples:**

**Validation Error (400):**
```json
{
  "email": ["Enter a valid email address."],
  "password": ["This field is required."]
}
```

**Authentication Error (401):**
```json
{
  "detail": "Given token not valid for any token type"
}
```

---

## User Management

### Register New User

**POST** `/api/users/register/` (Public)

Creates new user account and sends verification email.

**Request:**
```json
{
  "email": "user@example.com",
  "username": "username",
  "password": "SecurePassword123!",
  "password_confirm": "SecurePassword123!",
  "first_name": "John",
  "last_name": "Doe",
  "timezone": "America/New_York"
}
```

**Response (201 Created):**
```json
{
  "message": "Registration successful! Please check your email to verify your account.",
  "email": "user@example.com",
  "email_verified": false,
  "is_approved": false
}
```

**Rate Limit:** 5 requests/hour

### Verify Email

**POST** `/api/users/verify-email/` (Public)

Verifies user email with token from verification email.

**Request:**
```json
{
  "token": "uuid-token-from-email"
}
```

**Response (200 OK):**
```json
{
  "message": "Email verified successfully.",
  "email_verified": true,
  "is_approved": false
}
```

**Notes:**
- Tokens expire after 24 hours (configurable)
- Tokens are single-use
- Admin approval still required before login

### Resend Verification Email

**POST** `/api/users/resend-verification/` (Public)

Resends verification email if original was lost.

**Request:**
```json
{
  "email": "user@example.com"
}
```

**Response (200 OK):**
```json
{
  "message": "Verification email sent."
}
```

### Get User Profile

**GET** `/api/users/profile/` (Authenticated)

Returns current user's profile information.

**Response:**
```json
{
  "id": "uuid-string",
  "email": "user@example.com",
  "username": "username",
  "first_name": "John",
  "last_name": "Doe",
  "timezone": "America/New_York",
  "default_reminder_minutes": 30,
  "email_notifications": true,
  "push_notifications": true,
  "created_at": "2024-01-15T10:30:00Z",
  "updated_at": "2024-01-20T14:45:00Z"
}
```

### Update User Profile

**PATCH** `/api/users/profile/` (Authenticated)

Updates current user's profile. All fields optional.

**Request:**
```json
{
  "first_name": "John",
  "last_name": "Doe",
  "timezone": "America/Los_Angeles",
  "default_reminder_minutes": 15,
  "email_notifications": true,
  "push_notifications": false
}
```

**Response:** Updated user object

### Change Password

**POST** `/api/users/change-password/` (Authenticated)

Changes user's password.

**Request:**
```json
{
  "old_password": "CurrentPassword123!",
  "new_password": "NewPassword123!"
}
```

**Response (200 OK):**
```json
{
  "message": "Password changed successfully."
}
```

### Device Token Management

#### Register Device

**POST** `/api/users/devices/` (Authenticated)

Registers device for push notifications.

**Request:**
```json
{
  "platform": "android",
  "token": "firebase_device_token",
  "device_name": "John's Phone"
}
```

**Platform Options:** `android`, `web`, `desktop`

**Response (201 Created):**
```json
{
  "id": "uuid-string",
  "platform": "android",
  "token": "firebase_device_token",
  "device_name": "John's Phone",
  "is_active": true,
  "created_at": "2024-01-15T10:30:00Z"
}
```

#### List Devices

**GET** `/api/users/devices/` (Authenticated)

Returns all registered devices for current user.

#### Delete Device

**DELETE** `/api/users/devices/{device_id}/` (Authenticated)

Removes device token.

**Response (204 No Content)**

---

## Task Management

### List Tasks

**GET** `/api/tasks/` (Authenticated)

Returns paginated list of tasks owned by or shared with user.

**Query Parameters:**
- `status` - Filter: `pending`, `in_progress`, `completed`, `cancelled`
- `priority` - Filter: `low`, `medium`, `high`, `urgent`
- `parent` - Filter by parent task ID (shows only subtasks)
- `search` - Search in title and description
- `ordering` - Sort by: `due_date`, `-due_date`, `priority`, `created_at`, `sort_order`
- `page` - Page number (default: 1)

**Example:**
```
GET /api/tasks/?status=pending&priority=high&ordering=-due_date
```

**Response:**
```json
{
  "count": 45,
  "next": "http://domain/api/tasks/?page=2",
  "previous": null,
  "results": [
    {
      "id": "uuid-string",
      "title": "Complete project proposal",
      "status": "in_progress",
      "priority": "high",
      "due_date": "2024-02-15",
      "due_time": "17:00:00",
      "tags": [...],
      "subtask_count": 2,
      "is_overdue": false,
      "sync_id": "uuid-string",
      "updated_at": "2024-01-20T14:00:00Z"
    }
  ]
}
```

### Create Task

**POST** `/api/tasks/` (Authenticated)

Creates a new task.

**Request:**
```json
{
  "title": "Complete project proposal",
  "description": "Detailed description",
  "status": "pending",
  "priority": "high",
  "due_date": "2024-02-15",
  "due_time": "17:00:00",
  "reminder_at": "2024-02-15T16:00:00Z",
  "recurrence": "none",
  "recurrence_end_date": null,
  "tag_ids": ["uuid-1", "uuid-2"],
  "parent": null,
  "sort_order": 0
}
```

**Field Reference:**

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| title | string | Yes | Task title (max 500 chars) |
| description | string | No | Detailed description |
| status | enum | No | `pending`, `in_progress`, `completed`, `cancelled` |
| priority | enum | No | `low`, `medium`, `high`, `urgent` |
| due_date | date | No | YYYY-MM-DD |
| due_time | time | No | HH:MM:SS |
| reminder_at | datetime | No | ISO 8601 format |
| recurrence | enum | No | `none`, `daily`, `weekly`, `biweekly`, `monthly`, `yearly`, `custom` |
| recurrence_rule | string | No | RRULE string for custom recurrence |
| recurrence_end_date | date | No | End date for recurring tasks |
| tag_ids | array | No | Array of tag UUIDs |
| parent | uuid | No | Parent task ID (for subtasks) |
| sort_order | integer | No | Display order |

**Response (201 Created):**
```json
{
  "id": "uuid-string",
  "sync_id": "uuid-string",
  "title": "Complete project proposal",
  "description": "Detailed description",
  "status": "pending",
  "priority": "high",
  "due_date": "2024-02-15",
  "due_time": "17:00:00",
  "reminder_at": "2024-02-15T16:00:00Z",
  "completed_at": null,
  "recurrence": "none",
  "recurrence_rule": "",
  "recurrence_end_date": null,
  "tags": [...],
  "subtasks": [],
  "is_overdue": false,
  "total_time_spent": 0,
  "created_at": "2024-01-20T14:00:00Z",
  "updated_at": "2024-01-20T14:00:00Z"
}
```

**Notes:**
- When a recurring task is completed, the next instance is automatically created
- `completed_at` is automatically set when `status` changes to `completed`
- `is_overdue` is calculated based on user's timezone

### Get Task Details

**GET** `/api/tasks/{task_id}/` (Authenticated)

Returns full task details including subtasks.

**Response:** Task object with nested subtasks array

### Update Task

**PATCH** `/api/tasks/{task_id}/` (Authenticated)

Updates task fields. All fields optional.

**Request:**
```json
{
  "title": "Updated title",
  "status": "completed",
  "priority": "medium"
}
```

**Response:** Updated task object

### Delete Task

**DELETE** `/api/tasks/{task_id}/` (Authenticated)

Soft-deletes task (marks as deleted, preserves in database for sync).

**Response (204 No Content)**

---

## Tags

### List Tags

**GET** `/api/tasks/tags/` (Authenticated)

Returns all tags for current user.

**Response:**
```json
[
  {
    "id": "uuid-string",
    "name": "work",
    "description": "Work-related tasks",
    "color": "#3B82F6",
    "icon": "briefcase",
    "sort_order": 0,
    "is_archived": false,
    "task_count": 12,
    "sync_id": "uuid-string",
    "created_at": "2024-01-10T10:00:00Z",
    "updated_at": "2024-01-20T14:00:00Z"
  }
]
```

### Create Tag

**POST** `/api/tasks/tags/` (Authenticated)

Creates a new tag.

**Request:**
```json
{
  "name": "work",
  "description": "Work-related tasks",
  "color": "#3B82F6",
  "icon": "briefcase",
  "sort_order": 0,
  "is_archived": false
}
```

**Response (201 Created):** Tag object

### Update Tag

**PATCH** `/api/tasks/tags/{tag_id}/` (Authenticated)

Updates tag fields.

### Delete Tag

**DELETE** `/api/tasks/tags/{tag_id}/` (Authenticated)

Soft-deletes tag.

**Response (204 No Content)**

---

## Time Tracking

### List Time Entries

**GET** `/api/tasks/time-entries/` (Authenticated)

Returns time entries for user's tasks.

**Query Parameters:**
- `task` - Filter by task UUID

**Response:**
```json
[
  {
    "id": "uuid-string",
    "task": "task-uuid",
    "started_at": "2024-01-20T09:00:00Z",
    "ended_at": "2024-01-20T10:30:00Z",
    "duration_seconds": 5400,
    "notes": "Worked on section 2",
    "is_running": false,
    "sync_id": "uuid-string"
  }
]
```

### Create Time Entry

**POST** `/api/tasks/time-entries/` (Authenticated)

Creates a time entry (manual entry or closed timer).

**Request:**
```json
{
  "task": "task-uuid",
  "started_at": "2024-01-20T09:00:00Z",
  "ended_at": "2024-01-20T10:30:00Z",
  "notes": "Worked on section 2"
}
```

**Notes:**
- If `ended_at` is omitted, timer is considered running
- `duration_seconds` is automatically calculated from start/end times

**Response (201 Created):** Time entry object

### Start Timer (Convenience)

**POST** `/api/tasks/{task_id}/start-timer/` (Authenticated)

Starts a timer for specified task. Only one timer can run at a time.

**Request:** Empty body

**Response (201 Created):**
```json
{
  "id": "uuid-string",
  "task": "task-uuid",
  "started_at": "2024-01-20T14:30:00Z",
  "ended_at": null,
  "is_running": true,
  "sync_id": "uuid-string"
}
```

**Error (400):**
```json
{
  "error": "You already have a running timer. Stop it first."
}
```

### Stop Timer

**POST** `/api/tasks/time-entries/{entry_id}/stop/` (Authenticated)

Stops a running timer.

**Request:** Empty body

**Response:**
```json
{
  "id": "uuid-string",
  "task": "task-uuid",
  "started_at": "2024-01-20T14:30:00Z",
  "ended_at": "2024-01-20T14:45:00Z",
  "duration_seconds": 900,
  "is_running": false
}
```

### Update Time Entry

**PATCH** `/api/tasks/time-entries/{entry_id}/` (Authenticated)

Updates time entry fields.

### Delete Time Entry

**DELETE** `/api/tasks/time-entries/{entry_id}/` (Authenticated)

Soft-deletes time entry.

**Response (204 No Content)**

---

## Task Sharing

### List Shares

**GET** `/api/tasks/shares/` (Authenticated)

Returns shares where user is owner or recipient.

**Response:**
```json
[
  {
    "id": "uuid-string",
    "task": "task-uuid",
    "tag": null,
    "shared_with_email": "colleague@example.com",
    "permission": "viewer",
    "sync_id": "uuid-string",
    "created_at": "2024-01-20T14:00:00Z"
  }
]
```

### Create Share

**POST** `/api/tasks/shares/` (Authenticated)

Shares a task or tag with another user.

**Request (share task):**
```json
{
  "task": "task-uuid",
  "shared_with_email": "colleague@example.com",
  "permission": "viewer"
}
```

**Request (share tag):**
```json
{
  "tag": "tag-uuid",
  "shared_with_email": "colleague@example.com",
  "permission": "editor"
}
```

**Permission Levels:**
- `viewer` - Read-only access
- `editor` - Can modify (not yet fully implemented)

**Validation:**
- Cannot share both task and tag in one request
- Cannot share with yourself
- Recipient email must exist in system
- Must own the task/tag being shared

**Response (201 Created):** Share object

### Delete Share

**DELETE** `/api/tasks/shares/{share_id}/` (Authenticated)

Removes a share. Owner only.

**Response (204 No Content)**

---

## Sync (Offline-First)

The sync system enables offline-first mobile/desktop clients through bidirectional synchronization.

### Main Sync Endpoint

**POST** `/api/sync/` (Authenticated)

Performs bidirectional sync: accepts client changes, returns server changes.

**Rate Limit:** 100 requests/hour

**Request:**
```json
{
  "device_id": "unique-device-identifier",
  "last_sync_token": "previous-token-or-null",
  "changes": {
    "tasks": [
      {
        "sync_id": "uuid-string",
        "title": "Task title",
        "status": "completed",
        "priority": "high",
        "due_date": "2024-02-15",
        "due_time": "17:00:00",
        "description": "Description",
        "tag_sync_ids": ["tag-sync-id-1"],
        "parent_sync_id": null,
        "sort_order": 0,
        "is_deleted": false
      }
    ],
    "tags": [
      {
        "sync_id": "uuid-string",
        "name": "work",
        "description": "Work tasks",
        "color": "#3B82F6",
        "icon": "briefcase",
        "is_deleted": false
      }
    ],
    "time_entries": [
      {
        "sync_id": "uuid-string",
        "task_sync_id": "task-sync-id",
        "started_at": "2024-01-20T09:00:00Z",
        "ended_at": "2024-01-20T10:30:00Z",
        "notes": "Work notes",
        "is_deleted": false
      }
    ]
  }
}
```

**Response (200 OK):**
```json
{
  "sync_token": "new-uuid-token",
  "server_time": "2024-01-20T14:30:00Z",
  "server_changes": {
    "tasks": [...],
    "tags": [...],
    "time_entries": [...]
  },
  "conflicts": [
    {
      "id": "conflict-uuid",
      "entity_type": "task",
      "entity_id": "task-uuid",
      "local_data": {...},
      "server_data": {...},
      "status": "pending"
    }
  ]
}
```

**Sync Process:**
1. Client submits changes with `device_id` and optional `last_sync_token`
2. Server processes client changes and detects conflicts
3. Server returns new `sync_token`, server changes since last sync, and any conflicts
4. Client applies server changes and handles conflicts
5. Next sync uses returned `sync_token` as `last_sync_token`

**Full vs Incremental Sync:**
- **Full Sync:** If `last_sync_token` is null/invalid, server returns all data
- **Incremental Sync:** If `last_sync_token` is valid, server returns only changes since that sync

**Key Sync Concepts:**
- Uses `sync_id` (separate from database `id`) for cross-device consistency
- Includes `is_deleted` flag to propagate deletions
- Soft-delete architecture maintains data for sync
- Timestamp-based conflict detection

### Get Sync Conflicts

**GET** `/api/sync/conflicts/` (Authenticated)

Lists pending conflicts requiring resolution.

**Response:**
```json
[
  {
    "id": "conflict-uuid",
    "entity_type": "task",
    "entity_id": "task-uuid",
    "local_data": {
      "title": "Client version",
      "status": "completed"
    },
    "server_data": {
      "title": "Server version",
      "status": "in_progress"
    },
    "status": "pending",
    "created_at": "2024-01-20T14:30:00Z"
  }
]
```

### Resolve Sync Conflict

**POST** `/api/sync/conflicts/{conflict_id}/resolve/` (Authenticated)

Resolves a conflict using one of three strategies.

**Request (use local/client version):**
```json
{
  "resolution": "local"
}
```

**Request (use server version):**
```json
{
  "resolution": "server"
}
```

**Request (use merged version):**
```json
{
  "resolution": "merged",
  "merged_data": {
    "title": "Merged title",
    "status": "completed"
  }
}
```

**Response (200 OK):**
```json
{
  "status": "resolved"
}
```

---

## Notifications

### List Notifications

**GET** `/api/notifications/` (Authenticated)

Returns notifications for current user.

**Query Parameters:**
- `is_read` - Filter: `true` or `false`

**Response:**
```json
[
  {
    "id": "notification-uuid",
    "notification_type": "reminder",
    "title": "Task reminder",
    "message": "Complete project proposal is due soon",
    "task": "task-uuid",
    "task_title": "Complete project proposal",
    "is_read": false,
    "read_at": null,
    "created_at": "2024-01-20T14:00:00Z"
  }
]
```

**Notification Types:**
- `reminder` - Task reminder
- `due_soon` - Task due soon
- `overdue` - Task overdue
- `shared` - Task/tag shared with user
- `daily_email` - Daily email digest sent

### Mark Notification as Read

**POST** `/api/notifications/{notification_id}/read/` (Authenticated)

Marks single notification as read.

**Response:** Updated notification object with `is_read: true`

### Mark All as Read

**POST** `/api/notifications/read-all/` (Authenticated)

Marks all unread notifications as read.

**Response:**
```json
{
  "status": "All notifications marked as read"
}
```

### Get Unread Count

**GET** `/api/notifications/unread-count/` (Authenticated)

Returns count of unread notifications.

**Response:**
```json
{
  "unread_count": 5
}
```

### Delete Notification

**DELETE** `/api/notifications/{notification_id}/` (Authenticated)

Deletes notification.

**Response (204 No Content)**

---

## Common Patterns

### Pagination

List endpoints return paginated results (50 items per page):

```json
{
  "count": 100,
  "next": "https://domain/api/tasks/?page=2",
  "previous": null,
  "results": [...]
}
```

Use `page` query parameter to navigate: `?page=2`

### Filtering & Search

**Available Filters:**
- Tasks: `status`, `priority`, `parent`
- Notifications: `is_read`
- Time Entries: `task`

**Search:**
- Tasks: Searches `title` and `description` fields
- Use `search` query parameter: `?search=project`

**Ordering:**
- Use `ordering` parameter with field name
- Prefix with `-` for descending: `?ordering=-due_date`
- Available fields vary by endpoint

### Timezone Handling

**User Timezone:**
- Stored as IANA timezone string (e.g., "America/New_York")
- Used for due date calculations and email timing

**API Timestamps:**
- All timestamps in ISO 8601 format with UTC: `2024-01-20T19:00:00Z`
- Clients should convert to user's timezone for display

### Recurring Tasks

**Recurrence Types:**
- `none` - No recurrence
- `daily` - Every day
- `weekly` - Every week (same day)
- `biweekly` - Every 2 weeks
- `monthly` - Every month (same date)
- `yearly` - Every year (same date)
- `custom` - Custom RRULE pattern

**Behavior:**
- When recurring task marked as completed, next instance automatically created
- New instance has `status: pending` and calculated `due_date`
- Recurrence stops at `recurrence_end_date` if specified

**Custom RRULE Example:**
```json
{
  "recurrence": "custom",
  "recurrence_rule": "FREQ=WEEKLY;BYDAY=MO,WE,FR",
  "recurrence_end_date": "2024-12-31"
}
```

### Complete Workflow Example

**1. Register:**
```bash
POST /api/users/register/
{
  "email": "user@example.com",
  "password": "SecurePass123!",
  "password_confirm": "SecurePass123!",
  "timezone": "America/New_York"
}
```

**2. Verify Email:**
```bash
POST /api/users/verify-email/
{
  "token": "token-from-email"
}
```

**3. Wait for Admin Approval** (admin sets `is_approved = true`)

**4. Login:**
```bash
POST /api/users/token/
{
  "username": "user@example.com",
  "password": "SecurePass123!"
}
```

**5. Create Task:**
```bash
POST /api/tasks/
Authorization: Bearer {access_token}
{
  "title": "Complete project",
  "priority": "high",
  "due_date": "2024-02-15"
}
```

**6. Start Timer:**
```bash
POST /api/tasks/{task_id}/start-timer/
Authorization: Bearer {access_token}
```

**7. Stop Timer:**
```bash
POST /api/tasks/time-entries/{entry_id}/stop/
Authorization: Bearer {access_token}
```

**8. Sync (Mobile App):**
```bash
POST /api/sync/
Authorization: Bearer {access_token}
{
  "device_id": "device-123",
  "last_sync_token": null,
  "changes": { ... }
}
```

---

## Additional Information

### Security

- JWT authentication with Bearer tokens
- Access tokens expire after 60 minutes
- Refresh tokens last 7 days and rotate on use
- Email verification required
- Admin approval required for new accounts
- Users can only access their own data (except shared items)

### Data Limits

- Max file upload: 5 MB
- Max request body: 5 MB
- Task title: 500 characters max
- Page size: 50 items

### CORS

Cross-Origin Resource Sharing (CORS) is configured. Contact admin for allowed origins.

### API Versioning

Current version: 1.0 (no version prefix in URLs)

---

## Support

For API support or questions:
- GitHub Issues: Create an issue in the repository
- Email: keith@firebugit.com

---

**Built by Firebug IT**
**Documentation Version: 1.0**
**Last Updated: 2025-01-10**