{
  "openapi": "3.0.3",
  "info": {
    "title": "pgEdge RAG Server API",
    "description": "REST API for querying RAG (Retrieval-Augmented Generation) pipelines",
    "version": "1.0.0"
  },
  "servers": [
    {
      "url": "/v1",
      "description": "API v1"
    }
  ],
  "paths": {
    "/health": {
      "get": {
        "summary": "Health check",
        "description": "Check if the server is running and healthy",
        "operationId": "getHealth",
        "tags": [
          "System"
        ],
        "responses": {
          "200": {
            "description": "Server is healthy",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/HealthResponse"
                }
              }
            }
          }
        }
      }
    },
    "/pipelines": {
      "get": {
        "summary": "List pipelines",
        "description": "Get a list of all available RAG pipelines",
        "operationId": "listPipelines",
        "tags": [
          "Pipelines"
        ],
        "responses": {
          "200": {
            "description": "List of pipelines",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/PipelinesResponse"
                }
              }
            }
          }
        }
      }
    },
    "/pipelines/{name}": {
      "post": {
        "summary": "Query pipeline",
        "description": "Execute a RAG query against a specific pipeline",
        "operationId": "queryPipeline",
        "tags": [
          "Pipelines"
        ],
        "parameters": [
          {
            "name": "name",
            "in": "path",
            "description": "Pipeline name",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "requestBody": {
          "description": "Query request",
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/QueryRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Query response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/QueryResponse"
                }
              },
              "text/event-stream": {
                "schema": {
                  "type": "string",
                  "description": "Server-Sent Events stream"
                }
              }
            }
          },
          "400": {
            "description": "Invalid request",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "404": {
            "description": "Pipeline not found",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Server error",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "ErrorDetail": {
        "type": "object",
        "properties": {
          "code": {
            "type": "string",
            "description": "Error code"
          },
          "message": {
            "type": "string",
            "description": "Error message"
          }
        },
        "required": [
          "code",
          "message"
        ]
      },
      "ErrorResponse": {
        "type": "object",
        "properties": {
          "error": {
            "$ref": "#/components/schemas/ErrorDetail"
          }
        },
        "required": [
          "error"
        ]
      },
      "HealthResponse": {
        "type": "object",
        "properties": {
          "status": {
            "type": "string",
            "description": "Health status"
          }
        },
        "required": [
          "status"
        ]
      },
      "Message": {
        "type": "object",
        "properties": {
          "content": {
            "type": "string",
            "description": "Message content"
          },
          "role": {
            "type": "string",
            "description": "Message role (user or assistant)"
          }
        },
        "required": [
          "role",
          "content"
        ]
      },
      "PipelineInfo": {
        "type": "object",
        "properties": {
          "description": {
            "type": "string",
            "description": "Pipeline description"
          },
          "name": {
            "type": "string",
            "description": "Pipeline name"
          }
        },
        "required": [
          "name"
        ]
      },
      "PipelinesResponse": {
        "type": "object",
        "properties": {
          "pipelines": {
            "type": "array",
            "description": "List of available pipelines",
            "items": {
              "$ref": "#/components/schemas/PipelineInfo"
            }
          }
        },
        "required": [
          "pipelines"
        ]
      },
      "QueryRequest": {
        "type": "object",
        "properties": {
          "include_sources": {
            "type": "boolean",
            "description": "Include source documents in response",
            "default": false
          },
          "messages": {
            "type": "array",
            "description": "Previous conversation history for context",
            "items": {
              "$ref": "#/components/schemas/Message"
            }
          },
          "query": {
            "type": "string",
            "description": "The question to answer"
          },
          "stream": {
            "type": "boolean",
            "description": "Enable streaming response (SSE)",
            "default": false
          },
          "top_n": {
            "type": "integer",
            "description": "Override default result limit"
          }
        },
        "required": [
          "query"
        ]
      },
      "QueryResponse": {
        "type": "object",
        "properties": {
          "answer": {
            "type": "string",
            "description": "The generated answer"
          },
          "sources": {
            "type": "array",
            "description": "Source documents (only if include_sources=true)",
            "items": {
              "$ref": "#/components/schemas/Source"
            }
          },
          "tokens_used": {
            "type": "integer",
            "description": "Total tokens consumed"
          }
        },
        "required": [
          "answer",
          "tokens_used"
        ]
      },
      "Source": {
        "type": "object",
        "properties": {
          "content": {
            "type": "string",
            "description": "Document content"
          },
          "id": {
            "type": "string",
            "description": "Document identifier"
          },
          "score": {
            "type": "number",
            "format": "double",
            "description": "Relevance score"
          }
        },
        "required": [
          "content",
          "score"
        ]
      }
    }
  }
}