openapi: 3.1.0
info:
  title: Bit - URL Shortener API
  description: A high-performance URL shortener service with click tracking and analytics
  version: 1.0.0
  contact:
    name: API Support
    url: https://github.com/sjdonado/bit

servers:
  - url: http://localhost:4000
    description: Development server
  - url: http://localhost:4001
    description: Benchmark server

security:
  - ApiKeyAuth: []

paths:
  /api/ping:
    get:
      summary: Ping the API
      description: Health check endpoint to verify the API is running
      operationId: ping
      tags:
        - Health
      security: []
      responses:
        '200':
          description: API is healthy
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: string
                    example: pong

  /{slug}:
    get:
      summary: Redirect by slug
      description: Redirects to the original URL and tracks the click asynchronously
      operationId: redirectBySlug
      tags:
        - Redirects
      security: []
      parameters:
        - name: slug
          in: path
          required: true
          description: The short URL slug
          schema:
            type: string
            example: 3wP4BQ
        - name: utm_source
          in: query
          required: false
          description: UTM source parameter for tracking
          schema:
            type: string
            example: email_campaign
      responses:
        '301':
          description: Redirect to original URL
          headers:
            Location:
              description: The original URL
              schema:
                type: string
                example: https://example.com
            X-Forwarded-For:
              description: Client IP address
              schema:
                type: string
            User-Agent:
              description: User agent string
              schema:
                type: string
        '404':
          description: Link not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

  /api/links:
    get:
      summary: List all links
      description: Retrieve all links for the authenticated user with pagination support
      operationId: listLinks
      tags:
        - Links
      parameters:
        - name: limit
          in: query
          description: Number of results per page
          schema:
            type: integer
            default: 100
            minimum: 1
            maximum: 1000
        - name: cursor
          in: query
          description: Pagination cursor from previous response
          schema:
            type: string
      responses:
        '200':
          description: List of links
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/LinkSummary'
                  pagination:
                    $ref: '#/components/schemas/Pagination'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

    post:
      summary: Create new link
      description: Create a new shortened link
      operationId: createLink
      tags:
        - Links
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - url
              properties:
                url:
                  type: string
                  format: uri
                  description: The URL to shorten
                  example: https://example.com
      responses:
        '201':
          description: Link created successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/Link'
        '400':
          description: Bad request - invalid URL or missing field
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
              examples:
                missingField:
                  value:
                    error: "url: Required field"
                invalidUrl:
                  value:
                    errors:
                      url:
                        - is invalid
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

  /api/links/{id}:
    get:
      summary: Get link by ID
      description: Retrieve a specific link with up to 100 most recent clicks. For complete click history, use /api/links/{id}/clicks
      operationId: getLink
      tags:
        - Links
      parameters:
        - name: id
          in: path
          required: true
          description: Link ID
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: Link details
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/Link'
        '404':
          description: Link not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

    put:
      summary: Update link
      description: Update the URL of an existing link
      operationId: updateLink
      tags:
        - Links
      parameters:
        - name: id
          in: path
          required: true
          description: Link ID
          schema:
            type: integer
            format: int64
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - url
              properties:
                url:
                  type: string
                  format: uri
                  description: The new URL
                  example: https://newexample.com
      responses:
        '200':
          description: Link updated successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/Link'
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: Forbidden - link belongs to another user
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Link not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

    delete:
      summary: Delete link
      description: Delete a link and all its associated clicks
      operationId: deleteLink
      tags:
        - Links
      parameters:
        - name: id
          in: path
          required: true
          description: Link ID
          schema:
            type: integer
            format: int64
      responses:
        '204':
          description: Link deleted successfully
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: Forbidden - link belongs to another user
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Link not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

  /api/links/{id}/clicks:
    get:
      summary: List clicks for a link
      description: Retrieve all clicks for a specific link with pagination support
      operationId: listClicks
      tags:
        - Clicks
      parameters:
        - name: id
          in: path
          required: true
          description: Link ID
          schema:
            type: integer
            format: int64
        - name: limit
          in: query
          description: Number of results per page
          schema:
            type: integer
            default: 100
            minimum: 1
            maximum: 1000
        - name: cursor
          in: query
          description: Pagination cursor from previous response
          schema:
            type: string
      responses:
        '200':
          description: List of clicks
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Click'
                  pagination:
                    $ref: '#/components/schemas/Pagination'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Link not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'

components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-Api-Key
      description: API key for authentication

  schemas:
    LinkSummary:
      type: object
      properties:
        id:
          type: integer
          format: int64
          description: Unique link identifier
          example: 1
        refer:
          type: string
          format: uri
          description: The shortened URL
          example: http://localhost:4000/3wP4BQ
        origin:
          type: string
          format: uri
          description: The original URL
          example: https://monocuco.donado.co

    Link:
      allOf:
        - $ref: '#/components/schemas/LinkSummary'
        - type: object
          properties:
            clicks:
              type: array
              description: Array of click records (up to 100 most recent)
              items:
                $ref: '#/components/schemas/Click'

    Click:
      type: object
      properties:
        id:
          type: integer
          format: int64
          description: Unique click identifier
          example: 1
        user_agent:
          type: string
          description: User agent string
          example: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0
        country:
          type: string
          nullable: true
          description: Country code (ISO 3166-1 alpha-2)
          example: US
        browser:
          type: string
          nullable: true
          description: Browser name
          example: Firefox
        os:
          type: string
          nullable: true
          description: Operating system
          example: Mac OS X
        referer:
          type: string
          nullable: true
          description: Referer domain or utm_source
          example: Direct
        created_at:
          type: string
          format: date-time
          description: Click timestamp
          example: 2024-07-12T19:25:22Z

    Pagination:
      type: object
      properties:
        has_more:
          type: boolean
          description: Whether there are more results
          example: true
        next:
          type: integer
          format: int64
          nullable: true
          description: Cursor for next page (link/click ID)
          example: 12

    Error:
      type: object
      properties:
        error:
          type: string
          description: Error message
          example: Resource not found
      required:
        - error

    ValidationErrors:
      type: object
      properties:
        errors:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: Field-level validation errors
          example:
            url:
              - is invalid

tags:
  - name: Health
    description: Health check endpoints
  - name: Redirects
    description: URL redirection and click tracking
  - name: Links
    description: Link management operations
  - name: Clicks
    description: Click analytics and tracking