openapi: 3.0.3
info:
  title: ChatSession & Message API
  version: 1.1.1
  description: |
    ChatSession & Message API（含 Archive/GetMessage/SSE 与 Run 调度）。自然语言：中文。
servers:
  - url: http://localhost:8000/api
    description: 本地开发（FrankenPHP / Docker）
tags:
  - name: ChatSession
    description: 会话管理
  - name: Message
    description: 消息追加与查询
  - name: Run
    description: Agent Run 调度
paths:
  /test:
    summary: 测试接口
    get:
      tags: [Test]
      responses:
        "200":
          description: 成功
  /sessions:
    post:
      tags: [ChatSession]
      summary: 创建会话
      security:
        - bearerAuth: []
      requestBody:
        required: false
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateSessionRequest'
      responses:
        "201":
          description: 创建成功
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatSession'
        "401":
          description: 未授权
    get:
      tags: [ChatSession]
      summary: 会话列表
      security:
        - bearerAuth: []
      parameters:
        - in: query
          name: page
          schema:
            type: integer
            default: 1
        - in: query
          name: per_page
          schema:
            type: integer
            default: 15
            maximum: 100
        - in: query
          name: status
          schema:
            type: string
            enum: [OPEN, LOCKED, CLOSED]
        - in: query
          name: q
          schema:
            type: string
          description: 模糊匹配 session_name
      responses:
        "200":
          description: 分页会话列表
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/ChatSession'
                  links:
                    $ref: '#/components/schemas/PaginationLinks'
                  meta:
                    $ref: '#/components/schemas/PaginationMeta'
        "401":
          description: 未授权
  /sessions/{session_id}:
    get:
      tags: [ChatSession]
      summary: 获取会话详情
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
      responses:
        "200":
          description: 会话详情
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatSession'
        "401":
          description: 未授权
        "404":
          description: 未找到
    patch:
      tags: [ChatSession]
      summary: 更新会话（重命名/状态）
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateSessionRequest'
      responses:
        "200":
          description: 更新成功
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatSession'
        "403":
          description: 状态门禁禁止
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        "422":
          description: 校验失败
        "401":
          description: 未授权
  /sessions/{session_id}/archive:
    post:
      tags: [ChatSession]
      summary: 归档会话（设为 CLOSED，幂等）
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
      responses:
        "200":
          description: 归档成功（或已归档）
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatSession'
        "401":
          description: 未授权
        "404":
          description: 未找到
  /sessions/{session_id}/messages:
    post:
      tags: [Message]
      summary: 追加消息（含幂等与状态门禁）
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AppendMessageRequest'
      responses:
        "201":
          description: 追加成功
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageResource'
        "403":
          description: 状态门禁禁止
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        "401":
          description: 未授权
    get:
      tags: [Message]
      summary: 按 seq 增量查询消息
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
        - in: query
          name: after_seq
          schema:
            type: integer
            default: 0
          description: 仅返回 seq 大于该值的消息
        - in: query
          name: limit
          schema:
            type: integer
            default: 50
            maximum: 200
          description: 返回数量上限
      responses:
        "200":
          description: 按 seq 升序的消息列表
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/MessageResource'
        "401":
          description: 未授权
  /sessions/{session_id}/messages/{message_id}:
    get:
      tags: [Message]
      summary: 获取单条消息（校验 session_id）
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
        - in: path
          name: message_id
          required: true
          schema:
            type: string
            format: uuid
      responses:
        "200":
          description: 消息详情
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageResource'
        "401":
          description: 未授权
        "404":
          description: 未找到或不属于该会话
  /sessions/{session_id}/sse:
    get:
      tags: [Message]
      summary: SSE 增量推送（backlog + Redis 实时）
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
        - in: query
          name: after_seq
          schema:
            type: integer
            default: 0
          description: backlog 起始 seq（若有 Last-Event-ID 以其为准）
        - in: query
          name: limit
          schema:
            type: integer
            default: 200
            maximum: 500
      responses:
        "200":
          description: text/event-stream SSE 流
          content:
            text/event-stream:
              schema:
                type: string
                example: |
                  id: 1
                  event: message
                  data: {"message_id":"...","seq":1}
        "401":
          description: 未授权
        "404":
          description: 未找到
  /sessions/{session_id}/runs:
    post:
      tags: [Run]
      summary: 触发一次 Agent Run（按 trigger_message_id 幂等）
      security:
        - bearerAuth: []
      parameters:
        - in: path
          name: session_id
          required: true
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DispatchRunRequest'
      responses:
        "201":
          description: 已触发（或复用进行中的 RUNNING）
          content:
            application/json:
              schema:
                type: object
                properties:
                  run_id:
                    type: string
                    format: uuid
        "401":
          description: 未授权
        "404":
          description: session 或 trigger_message 不存在
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
  schemas:
    ChatSession:
      type: object
      properties:
        session_id:
          type: string
          format: uuid
        session_name:
          type: string
          nullable: true
        status:
          type: string
          enum: [OPEN, LOCKED, CLOSED]
        last_seq:
          type: integer
        last_message_id:
          type: string
          format: uuid
          nullable: true
        last_message_at:
          type: string
          format: date-time
          nullable: true
        last_message_preview:
          type: string
        last_message_role:
          type: string
          nullable: true
        last_message_type:
          type: string
          nullable: true
        created_at:
          type: string
          format: date-time
        updated_at:
          type: string
          format: date-time
    CreateSessionRequest:
      type: object
      properties:
        session_name:
          type: string
          maxLength: 255
    UpdateSessionRequest:
      type: object
      properties:
        session_name:
          type: string
          minLength: 1
          maxLength: 255
        status:
          type: string
          enum: [OPEN, LOCKED, CLOSED]
    DispatchRunRequest:
      type: object
      required: [trigger_message_id]
      properties:
        trigger_message_id:
          type: string
          format: uuid
    AppendMessageRequest:
      type: object
      required: [role, type]
      properties:
        role:
          type: string
          enum: [USER, AGENT, TOOL, SYSTEM]
        type:
          type: string
          maxLength: 64
          example: user.prompt
        content:
          type: string
          nullable: true
        payload:
          nullable: true
          oneOf:
            - $ref: '#/components/schemas/RunStatusPayload'
            - $ref: '#/components/schemas/AgentMessagePayload'
            - $ref: '#/components/schemas/MessageDeltaPayload'
            - $ref: '#/components/schemas/RunCancelPayload'
            - $ref: '#/components/schemas/RunErrorPayload'
            - $ref: '#/components/schemas/ToolCallPayload'
            - $ref: '#/components/schemas/ToolResultPayload'
            - type: object
        reply_to:
          type: string
          format: uuid
          nullable: true
        dedupe_key:
          type: string
          maxLength: 128
          nullable: true
    MessageResource:
      type: object
      properties:
        message_id:
          type: string
          format: uuid
        session_id:
          type: string
          format: uuid
        seq:
          type: integer
        role:
          type: string
          enum: [USER, AGENT, TOOL, SYSTEM]
        type:
          type: string
        content:
          type: string
          nullable: true
        payload:
          type: object
          nullable: true
        reply_to:
          type: string
          format: uuid
          nullable: true
        dedupe_key:
          type: string
          nullable: true
        created_at:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        message:
          type: string
          example: Session is closed
    RunStatusPayload:
      type: object
      properties:
        run_id:
          type: string
          format: uuid
        status:
          type: string
          enum: [RUNNING, DONE, FAILED, CANCELED]
        trigger_message_id:
          type: string
          format: uuid
          nullable: true
        error:
          type: string
          nullable: true
    AgentMessagePayload:
      type: object
      properties:
        run_id:
          type: string
          format: uuid
        provider:
          type: string
    MessageDeltaPayload:
      type: object
      properties:
        run_id:
          type: string
          format: uuid
        delta_index:
          type: integer
    RunCancelPayload:
      type: object
      properties:
        run_id:
          type: string
          format: uuid
    RunErrorPayload:
      type: object
      properties:
        run_id:
          type: string
          format: uuid
        message:
          type: string
        retryable:
          type: boolean
          nullable: true
        http_status:
          type: integer
          nullable: true
        provider:
          type: string
          nullable: true
        latency_ms:
          type: integer
          nullable: true
        raw_message:
          type: string
          nullable: true
    ToolCallPayload:
      type: object
      properties:
        run_id:
          type: string
        tool_run_id:
          type: string
        tool_call_id:
          type: string
        name:
          type: string
        arguments:
          type: object
          additionalProperties: true
    ToolResultPayload:
      type: object
      properties:
        run_id:
          type: string
        parent_run_id:
          type: string
        tool_call_id:
          type: string
        name:
          type: string
        status:
          type: string
        error:
          type: string
          nullable: true
        truncated:
          type: boolean
    PaginationLinks:
      type: object
      properties:
        first:
          type: string
          example: http://localhost:8000/api/sessions?page=1
        last:
          type: string
          example: http://localhost:8000/api/sessions?page=1
        prev:
          type: string
          nullable: true
        next:
          type: string
          nullable: true
    PaginationMeta:
      type: object
      properties:
        current_page:
          type: integer
        from:
          type: integer
          nullable: true
        last_page:
          type: integer
        path:
          type: string
        per_page:
          type: integer
        to:
          type: integer
          nullable: true
        total:
          type: integer