openapi: 3.0.3
info:
  title: GitHub-Flavored Subset API
  version: 1.0.0
  description: >
    A small GitHub-flavored OpenAPI spec for testing oagen's reference emitter.
    Exercises: cursor pagination, bearer auth, models, enums, CRUD, nullable fields,
    error responses, and generic envelope patterns.

servers:
  - url: https://api.github-example.com/v1

security:
  - bearerAuth: []

components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

  schemas:
    PaginationMeta:
      type: object
      properties:
        next_cursor:
          type: string
          nullable: true
        has_more:
          type: boolean

    Visibility:
      type: string
      enum: [public, private, internal]

    Repository:
      type: object
      required: [id, name, full_name, visibility]
      properties:
        id:
          type: integer
        name:
          type: string
        full_name:
          type: string
        description:
          type: string
          nullable: true
        visibility:
          $ref: '#/components/schemas/Visibility'
        owner:
          $ref: '#/components/schemas/User'

    Issue:
      type: object
      required: [id, title, state]
      properties:
        id:
          type: integer
        title:
          type: string
        body:
          type: string
          nullable: true
        state:
          type: string
          enum: [open, closed]
        labels:
          type: array
          items:
            $ref: '#/components/schemas/Label'
        assignee:
          $ref: '#/components/schemas/User'
          nullable: true

    Label:
      type: object
      required: [id, name, color]
      properties:
        id:
          type: integer
        name:
          type: string
        color:
          type: string
        description:
          type: string
          nullable: true

    User:
      type: object
      required: [id, login]
      properties:
        id:
          type: integer
        login:
          type: string
        name:
          type: string
          nullable: true
        email:
          type: string
          nullable: true

    ApiError:
      type: object
      required: [message]
      properties:
        message:
          type: string
        documentation_url:
          type: string

paths:
  /repos:
    get:
      operationId: listRepos
      tags: [Repos]
      summary: List repositories
      parameters:
        - name: after
          in: query
          schema:
            type: string
        - name: limit
          in: query
          schema:
            type: integer
            default: 30
        - name: visibility
          in: query
          schema:
            $ref: '#/components/schemas/Visibility'
      responses:
        '200':
          description: A paginated list of repositories
          content:
            application/json:
              schema:
                type: object
                properties:
                  results:
                    type: array
                    items:
                      $ref: '#/components/schemas/Repository'
                  meta:
                    $ref: '#/components/schemas/PaginationMeta'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiError'

  /repos/{owner}/{repo}:
    get:
      operationId: getRepo
      tags: [Repos]
      summary: Get a repository
      parameters:
        - name: owner
          in: path
          required: true
          schema:
            type: string
        - name: repo
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Repository details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Repository'
        '404':
          description: Not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiError'

  /repos/{owner}/{repo}/issues:
    get:
      operationId: listIssues
      tags: [Issues]
      summary: List issues
      parameters:
        - name: owner
          in: path
          required: true
          schema:
            type: string
        - name: repo
          in: path
          required: true
          schema:
            type: string
        - name: after
          in: query
          schema:
            type: string
        - name: limit
          in: query
          schema:
            type: integer
            default: 30
        - name: state
          in: query
          schema:
            type: string
            enum: [open, closed, all]
      responses:
        '200':
          description: A paginated list of issues
          content:
            application/json:
              schema:
                type: object
                properties:
                  results:
                    type: array
                    items:
                      $ref: '#/components/schemas/Issue'
                  meta:
                    $ref: '#/components/schemas/PaginationMeta'

    post:
      operationId: createIssue
      tags: [Issues]
      summary: Create an issue
      parameters:
        - name: owner
          in: path
          required: true
          schema:
            type: string
        - name: repo
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [title]
              properties:
                title:
                  type: string
                body:
                  type: string
                labels:
                  type: array
                  items:
                    type: string
      responses:
        '201':
          description: Created issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Issue'
        '422':
          description: Validation error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiError'

  /repos/{owner}/{repo}/labels:
    get:
      operationId: listLabels
      tags: [Labels]
      summary: List labels
      parameters:
        - name: owner
          in: path
          required: true
          schema:
            type: string
        - name: repo
          in: path
          required: true
          schema:
            type: string
        - name: page
          in: query
          schema:
            type: integer
        - name: per_page
          in: query
          schema:
            type: integer
            default: 30
      responses:
        '200':
          description: A paginated list of labels
          content:
            application/json:
              schema:
                type: object
                properties:
                  items:
                    type: array
                    items:
                      $ref: '#/components/schemas/Label'
                  total_count:
                    type: integer

    post:
      operationId: createLabel
      tags: [Labels]
      summary: Create a label
      parameters:
        - name: owner
          in: path
          required: true
          schema:
            type: string
        - name: repo
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [name, color]
              properties:
                name:
                  type: string
                color:
                  type: string
                description:
                  type: string
      responses:
        '201':
          description: Created label
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Label'

  /repos/{owner}/{repo}/labels/{label_id}:
    delete:
      operationId: deleteLabel
      tags: [Labels]
      summary: Delete a label
      parameters:
        - name: owner
          in: path
          required: true
          schema:
            type: string
        - name: repo
          in: path
          required: true
          schema:
            type: string
        - name: label_id
          in: path
          required: true
          schema:
            type: integer
      responses:
        '204':
          description: Deleted

  /users/{username}:
    get:
      operationId: getUser
      tags: [Users]
      summary: Get a user
      parameters:
        - name: username
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: User details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '404':
          description: Not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiError'