# OpenAPI Specification for Example API

openapi: 3.0.0
info:
  title: Example API
  version: 1.0.0
  description: A sample API for demonstration purposes.
  termsOfService: REPLACE_ME # Add your terms of service URL here
  contact:
    name: API Support
    url: REPLACE_ME # Add your support URL here
    email: support@example.com
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0.html

servers:
  - url: https://api.example.com/v1
    description: Production server

paths:
  /users:
    get:
      summary: Get all users
      description: Retrieves a list of all users.
      operationId: getUsers
      tags:
        - users
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/User'
        '500':
          description: Internal server error
    post:
      summary: Create a new user
      description: Creates a new user in the system.
      operationId: createUser
      tags:
        - users
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UserCreate'
      responses:
        '201':
          description: User created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '400':
          description: Bad request
        '500':
          description: Internal server error

  /users/{userId}:
    get:
      summary: Get user by ID
      description: Retrieves a user by their ID.
      operationId: getUserById
      tags:
        - users
      parameters:
        - name: userId
          in: path
          description: ID of the user to retrieve.
          required: true
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '404':
          description: User not found
        '500':
          description: Internal server error
    put:
      summary: Update user by ID
      description: Updates an existing user.
      operationId: updateUser
      tags:
        - users
      parameters:
        - name: userId
          in: path
          description: ID of the user to update.
          required: true
          schema:
            type: integer
            format: int64
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UserUpdate'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '400':
          description: Bad request
        '404':
          description: User not found
        '500':
          description: Internal server error
    delete:
      summary: Delete user by ID
      description: Deletes a user by their ID.
      operationId: deleteUser
      tags:
        - users
      parameters:
        - name: userId
          in: path
          description: ID of the user to delete.
          required: true
          schema:
            type: integer
            format: int64
      responses:
        '204':
          description: User deleted successfully (No Content)
        '404':
          description: User not found
        '500':
          description: Internal server error

components:
  schemas:
    User:
      type: object
      properties:
        id:
          type: integer
          format: int64
          description: Unique identifier for the user
        username:
          type: string
          description: User's username
        email:
          type: string
          format: email
          description: User's email address
        firstName:
          type: string
          description: User's first name
        lastName:
          type: string
          description: User's last name
      required:
        - id
        - username
        - email

    UserCreate:
      type: object
      properties:
        username:
          type: string
          description: User's username
        email:
          type: string
          format: email
          description: User's email address
        firstName:
          type: string
          description: User's first name
        lastName:
          type: string
          description: User's last name
      required:
        - username
        - email

    UserUpdate:
      type: object
      properties:
        username:
          type: string
          description: User's username
        email:
          type: string
          format: email
          description: User's email address
        firstName:
          type: string
          description: User's first name
        lastName:
          type: string
          description: User's last name

  securitySchemes:
    bearerAuth:            # Define security scheme name
      type: http
      scheme: bearer
      bearerFormat: JWT

security:
  - bearerAuth: []       # Apply the security scheme to all endpoints (globally)