openapi: 3.0.0
info:
  title: TODO API
  version: 1.0.0
  description: A simple API to manage TODO items.

paths:
  /todos:
    get:
      summary: Get all TODO items
      description: "Returns a list of all TODO items."
      responses:
        '200':
          description: A list of TODO items
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TodoList'
    post:
      summary: Create a new TODO item
      description: "Creates a new TODO item."
      requestBody:
        description: TODO item to create
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TodoItem'
      responses:
        '201':
          description: TODO item created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TodoItem'

  /todos/{id}:
    get:
      summary: Get a TODO item by ID
      description: "Returns a single TODO item."
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: TODO item found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TodoItem'
        '404':
          description: TODO item not found

    put:
      summary: Update a TODO item by ID
      description: "Updates a single TODO item."
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      requestBody:
        description: Updated TODO item
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TodoItem'
      responses:
        '200':
          description: TODO item updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TodoItem'
        '404':
          description: TODO item not found

    delete:
      summary: Delete a TODO item by ID
      description: "Deletes a single TODO item."
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: TODO item deleted
        '404':
          description: TODO item not found

components:
  schemas:
    TodoList:
      type: array
      items:
        $ref: '#/components/schemas/TodoItem'

    TodoItem:
      type: object
      properties:
        id:
          type: string
          description: Unique identifier for the TODO item
        title:
          type: string
          description: The title of the task
        completed:
          type: boolean
          description: Whether the task is completed
        dueDate:
          type: string
          format: date-time
          description: When the task is due
      required:
        - id
        - title
        - completed