openapi: "3.1.0"
info:
  title: Migration Queue API
  version: "1.0.0"
  description: Legacy Document Migration pipeline endpoints (ADR-023A)

paths:
  /api/ai/migration/queue:
    post:
      summary: Submit legacy document for AI processing (n8n → DMS API)
      description: |
        Called by n8n during Legacy Migration Phase.
        Queues OCR + extract-metadata jobs (ai-batch).
        Result stored in migration_review_queue (status=PENDING).
        Requires Idempotency-Key header to prevent duplicates.
      security:
        - BearerAuth: []
      parameters:
        - name: Idempotency-Key
          in: header
          required: true
          schema:
            type: string
            example: "SD-001-2026:batch-001"
          description: Format — <doc_number>:<batch_id>
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MigrationQueueRequest'
      responses:
        "202":
          description: Job queued for AI processing
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MigrationQueuedResponse'
        "409":
          description: Duplicate — idempotency_key already exists

    get:
      summary: List migration_review_queue (Admin only)
      security:
        - BearerAuth: []
      parameters:
        - name: status
          in: query
          schema:
            type: string
            enum: [PENDING, IMPORTED, REJECTED]
        - name: batchId
          in: query
          schema:
            type: string
        - name: page
          in: query
          schema:
            type: integer
            default: 1
        - name: limit
          in: query
          schema:
            type: integer
            default: 20
      responses:
        "200":
          description: Paginated queue list
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MigrationQueueListResponse'

  /api/ai/migration/queue/{publicId}/approve:
    post:
      summary: Admin approves migration item → imports document
      description: |
        Imports document from temp path to DMS.
        Automatically queues embed-document job after import.
      security:
        - BearerAuth: []
      parameters:
        - name: publicId
          in: path
          required: true
          schema:
            type: string
            format: uuid
      responses:
        "200":
          description: Document imported, embed job queued
        "400":
          description: Item not in PENDING status
        "404":
          description: Queue item not found

  /api/ai/migration/queue/{publicId}/reject:
    post:
      summary: Admin rejects migration item
      security:
        - BearerAuth: []
      parameters:
        - name: publicId
          in: path
          required: true
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [reason]
              properties:
                reason:
                  type: string
                  maxLength: 500
      responses:
        "200":
          description: Item rejected
        "400":
          description: Item not in PENDING status

components:
  schemas:
    MigrationQueueRequest:
      type: object
      required: [batchId, filename, tempPath]
      properties:
        batchId:
          type: string
          description: n8n batch identifier
        filename:
          type: string
        tempPath:
          type: string
          description: Absolute path in temp storage on server

    MigrationQueuedResponse:
      type: object
      properties:
        publicId:
          type: string
          format: uuid
        status:
          type: string
          enum: [PENDING]
        jobId:
          type: string
          description: BullMQ job ID for tracking

    MigrationQueueListResponse:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/MigrationQueueItem'
        total:
          type: integer
        page:
          type: integer
        limit:
          type: integer

    MigrationQueueItem:
      type: object
      properties:
        publicId:
          type: string
          format: uuid
        batchId:
          type: string
        originalFilename:
          type: string
        aiMetadata:
          type: object
          description: AI-extracted metadata suggestion
        confidenceScore:
          type: number
          format: float
          minimum: 0
          maximum: 1
        ocrUsed:
          type: boolean
        status:
          type: string
          enum: [PENDING, IMPORTED, REJECTED]
        reviewedAt:
          type: string
          format: date-time
          nullable: true
        rejectionReason:
          type: string
          nullable: true
        createdAt:
          type: string
          format: date-time

  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT