openapi: 3.0.3
info:
  title: CRUD Example Service
  version: "1.0.0"
  description: Minimal OpenAPI-first CRUD service with in-memory mock data.

paths:
  /items:
    get:
      operationId: list_items
      summary: List all items
      responses:
        "200":
          description: List of items
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: "#/components/schemas/Item"

    post:
      operationId: create_item
      summary: Create a new item
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/ItemCreate"
      responses:
        "201":
          description: Item created
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Item"

  /items/{item_id}:
    get:
      operationId: get_item
      summary: Get item by ID
      parameters:
        - name: item_id
          in: path
          required: true
          schema:
            type: integer
      responses:
        "200":
          description: Item found
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Item"

    put:
      operationId: update_item
      summary: Update an item
      parameters:
        - name: item_id
          in: path
          required: true
          schema:
            type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/ItemCreate"
      responses:
        "200":
          description: Item updated
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Item"

    delete:
      operationId: delete_item
      summary: Delete an item
      parameters:
        - name: item_id
          in: path
          required: true
          schema:
            type: integer
      responses:
        "204":
          description: Item deleted

components:
  schemas:
    Item:
      type: object
      properties:
        id:
          type: integer
        name:
          type: string
        price:
          type: number
          format: float
      required: [id, name, price]

    ItemCreate:
      type: object
      properties:
        name:
          type: string
        price:
          type: number
          format: float
      required: [name, price]