openapi: 3.0.3
info:
  title: AI Voice Synthesis API
  description: |
    Standardized TTS API for AI assistants (Coze, Dify, GPTs, custom Agents).
    Supports sync/async modes, natural language instructions, smart voice recommendation.
  version: 1.0.0
  contact:
    name: AI Voice Team
    email: api@your-domain.com

servers:
  - url: https://api.your-domain.com
    description: Production
  - url: https://api-staging.your-domain.com
    description: Staging

tags:
  - name: voices
    description: Voice management
  - name: tts
    description: Speech synthesis
  - name: tasks
    description: Async tasks

paths:
  /v1/tts/voices:
    get:
      tags: [voices]
      summary: List available voices
      security:
        - bearerAuth: []
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VoiceListResponse'

  /v1/tts/detect:
    post:
      tags: [tts]
      summary: Smart detect (recommend voice + emotion)
      description: AI assistants should call this before synthesize
      security:
        - bearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DetectRequest'
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DetectResponse'

  /v1/tts/synthesize:
    post:
      tags: [tts]
      summary: Sync synthesis (short text, less than 500 chars)
      security:
        - bearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SynthesizeRequest'
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SynthesizeResponse'

  /v1/tts/async-synthesize:
    post:
      tags: [tts, tasks]
      summary: Async synthesis (long text)
      security:
        - bearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AsyncSynthesizeRequest'
      responses:
        '202':
          description: Task accepted
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AsyncSynthesizeResponse'

  /v1/tts/tasks/{task_id}:
    get:
      tags: [tasks]
      summary: Query task status
      security:
        - bearerAuth: []
      parameters:
        - name: task_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskResponse'

  /v1/tts/instruct:
    post:
      tags: [tts]
      summary: Natural language instruction synthesis
      description: |
        AI assistant describes requirements in natural language
        (e.g. "Use magnetic male voice, sad tone"), backend parses params and generates audio.
      security:
        - bearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InstructRequest'
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InstructResponse'

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

  schemas:
    Voice:
      type: object
      properties:
        id: { type: string, example: male-qn-jingying }
        name: { type: string, example: Magnetic Male Voice }
        gender: { type: string, enum: [male, female, neutral] }
        age: { type: string, enum: [child, young, middle, old] }
        style:
          type: array
          items: { type: string }
        language: { type: string, example: zh-CN }
        preview_url: { type: string, format: uri }
        description: { type: string }

    VoiceListResponse:
      type: object
      properties:
        code: { type: integer, example: 0 }
        message: { type: string }
        data:
          type: object
          properties:
            voices:
              type: array
              items: { $ref: '#/components/schemas/Voice' }

    DetectRequest:
      type: object
      required: [text]
      properties:
        text:
          type: string
          minLength: 10
          maxLength: 5000

    DetectResponse:
      type: object
      properties:
        code: { type: integer }
        data:
          type: object
          properties:
            voice_id: { type: string }
            voice_name: { type: string }
            emotion:
              type: string
              enum: [neutral, happy, sad, angry, fearful, surprised, disgusted]
            emotion_label: { type: string }
            scene: { type: string }
            role: { type: string }
            instruct_text: { type: string }

    SynthesizeRequest:
      type: object
      required: [text]
      properties:
        text: { type: string, minLength: 10, maxLength: 500 }
        voice_id: { type: string }
        emotion: { type: string, enum: [neutral, happy, sad, angry, fearful, surprised, disgusted] }
        speed: { type: number, minimum: 0.5, maximum: 2.0, default: 1.0 }
        pitch: { type: integer, minimum: -12, maximum: 12, default: 0 }
        volume: { type: integer, minimum: 0, maximum: 100, default: 50 }
        format: { type: string, enum: [mp3, wav, pcm], default: mp3 }
        sample_rate: { type: integer, enum: [16000, 24000, 48000], default: 24000 }

    SynthesizeResponse:
      type: object
      properties:
        code: { type: integer }
        data:
          type: object
          properties:
            audio_url: { type: string, format: uri }
            duration: { type: number }
            characters: { type: integer }
            cached: { type: boolean }
            request_id: { type: string }

    AsyncSynthesizeRequest:
      allOf:
        - $ref: '#/components/schemas/SynthesizeRequest'
        - type: object
          properties:
            text:
              type: string
              minLength: 10
              maxLength: 100000
            instruction: { type: string }
            callback_url: { type: string, format: uri }
            metadata:
              type: object
              additionalProperties: true

    AsyncSynthesizeResponse:
      type: object
      properties:
        code: { type: integer }
        data:
          type: object
          properties:
            task_id: { type: string }
            estimated_duration: { type: integer }
            status_url: { type: string }
            created_at: { type: string, format: date-time }

    TaskResponse:
      type: object
      properties:
        code: { type: integer }
        data:
          type: object
          properties:
            task_id: { type: string }
            status:
              type: string
              enum: [pending, processing, completed, failed]
            progress: { type: integer, minimum: 0, maximum: 100 }
            audio_url: { type: string, format: uri }
            duration: { type: number }
            characters: { type: integer }
            error: { type: string }
            completed_at: { type: string, format: date-time }
            metadata:
              type: object
              additionalProperties: true

    InstructRequest:
      type: object
      required: [text, instruction]
      properties:
        text: { type: string, minLength: 10, maxLength: 5000 }
        instruction:
          type: string
          example: Use magnetic male voice, sad tone, last sentence slow

    InstructResponse:
      type: object
      properties:
        code: { type: integer }
        data:
          type: object
          properties:
            parsed_params:
              type: object
              properties:
                voice_id: { type: string }
                emotion: { type: string }
                speed: { type: number }
                pitch: { type: integer }
            audio_url: { type: string, format: uri }
            duration: { type: number }