openapi: "3.1.0"
info:
  title: HelixForge Telegram Publishing
  version: "R-1"
  description: |
    Publishes composed channel posts to a Telegram channel.

    The unit of publication is a POST, not a hall entry. A post is a short,
    personal, reach-optimized piece written *from* a hall-of-helix entry — it
    is not the entry, and it is not a truncation of the entry.

    Composition happens upstream, before this interface is called. That is a
    deliberate architectural boundary and not an accident of layering:
    composing a condensed, entertaining post is a probabilistic task, and
    ArchitectureBlueprint.md section 48.1 names an LLM in the mandatory request
    path as an anti-pattern. This interface stays deterministic by taking the
    composed text as input.

    Publication is idempotent on post_id, because the caller is automation that
    may be retried and a duplicate post cannot be quietly undone.

paths:
  /v1/channel-posts:
    post:
      operationId: publishPost
      summary: Publish a composed channel post
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [post_id, body, source_entry_id, source_entry_url, reviewed_by]
              additionalProperties: false
              properties:
                post_id:
                  type: string
                  minLength: 1
                  maxLength: 128
                  description: |
                    Stable id for this post. Publication is idempotent on it.
                    A recomposition of the same entry is a NEW post_id, because
                    it is a different piece of writing about the same work.

                body:
                  type: string
                  minLength: 1
                  maxLength: 4096
                  description: |
                    The composed post, already within Telegram's single-message
                    limit. Bounded here on purpose: a composition that does not
                    fit was not condensed, and this interface must not decide
                    on the composer's behalf what to cut.

                source_entry_id:
                  type: string
                  minLength: 1
                  description: |
                    The hall entry this post was written from. Required: a post
                    with no traceable source cannot be checked against what the
                    person actually said about their own work.

                source_entry_url:
                  type: string
                  minLength: 1
                  description: Canonical location of the source entry.

                reviewed_by:
                  type: string
                  minLength: 1
                  description: |
                    Who approved this composition for publication. Required at
                    FLUID-2 and above: the post speaks about a named person's
                    work in HelixForge's voice, and no generated text reaches
                    subscribers without someone having read it.

                subject_display_name:
                  type: string
                  maxLength: 128
                  description: The person or agent whose work the post is about.

                subject_consent:
                  type: string
                  enum: [explicit, standing, not-required]
                  description: |
                    On what basis this post may speak about the subject's work.
                    "standing" covers contributors who agreed when they took a
                    seat in the hall; "explicit" is per-post approval.

                variant:
                  type: string
                  maxLength: 64
                  description: |
                    Which composition strategy produced this post. Opaque to
                    this interface: it records the label and reports engagement
                    against it, so that the campaign can compare strategies it
                    owns without this interface needing to understand them.

                visual_url:
                  type: string
                  description: Portrait or illustration to attach.

                tags:
                  type: array
                  maxItems: 8
                  items: {type: string, maxLength: 32}
      responses:
        "201":
          description: Published
        "200":
          description: Already published; the existing publication is returned
        "400":
          description: The post cannot be published as given
        "403":
          description: Publication refused; no review or no basis for consent
        "502":
          description: Telegram was unreachable or refused the message

    get:
      operationId: listPosts
      summary: List publications, newest first
      parameters:
        - name: limit
          in: query
          schema: {type: integer, minimum: 1, maximum: 100}
        - name: state
          in: query
          schema:
            type: string
            enum: [pending, published, failed, superseded]
        - name: variant
          in: query
          schema: {type: string, maxLength: 64}
        - name: source_entry_id
          in: query
          schema: {type: string}
      responses:
        "200":
          description: Publications

  /v1/channel-posts/{post_id}:
    get:
      operationId: getPost
      summary: Publication state for one post
      parameters:
        - name: post_id
          in: path
          required: true
          schema: {type: string, minLength: 1}
      responses:
        "200":
          description: Publication state
        "404":
          description: This post has not been published