{
  "openapi": "3.0.3",
  "info": {
    "title": "Card to IBAN API",
    "version": "1.0.0",
    "description": "Converts an Iranian bank card number to its IBAN."
  },
  "servers": [
    {
      "url": "/",
      "description": "Current server"
    }
  ],
  "tags": [
    {
      "name": "System"
    },
    {
      "name": "Conversion"
    }
  ],
  "paths": {
    "/health": {
      "get": {
        "tags": ["System"],
        "summary": "Check service health",
        "operationId": "getHealth",
        "responses": {
          "200": {
            "description": "The service is running.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/HealthResponse"
                },
                "example": {
                  "status": "ok"
                }
              }
            }
          }
        }
      }
    },
    "/api/v1/card-to-iban": {
      "post": {
        "tags": ["Conversion"],
        "summary": "Convert a card number to an IBAN",
        "operationId": "convertCardToIBAN",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/ConvertRequest"
              },
              "example": {
                "card": "6037997512345678"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "The card number was converted successfully.",
            "headers": {
              "X-Request-ID": {
                "$ref": "#/components/headers/RequestID"
              }
            },
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ConvertResponse"
                },
                "example": {
                  "data": {
                    "iban": "IR820540102680020817909002"
                  },
                  "requestId": "SERVER_GENERATED_REQUEST_ID"
                }
              }
            }
          },
          "400": {
            "$ref": "#/components/responses/InvalidCard"
          },
          "405": {
            "$ref": "#/components/responses/MethodNotAllowed"
          },
          "422": {
            "$ref": "#/components/responses/ConversionRejected"
          },
          "500": {
            "$ref": "#/components/responses/InternalError"
          },
          "502": {
            "$ref": "#/components/responses/UpstreamFailure"
          },
          "503": {
            "$ref": "#/components/responses/UpstreamUnavailable"
          },
          "504": {
            "$ref": "#/components/responses/UpstreamTimeout"
          }
        }
      }
    }
  },
  "components": {
    "headers": {
      "RequestID": {
        "description": "Identifier generated for tracing this request.",
        "schema": {
          "type": "string"
        },
        "example": "SERVER_GENERATED_REQUEST_ID"
      }
    },
    "schemas": {
      "HealthResponse": {
        "type": "object",
        "required": ["status"],
        "properties": {
          "status": {
            "type": "string",
            "enum": ["ok"]
          }
        }
      },
      "ConvertRequest": {
        "type": "object",
        "additionalProperties": false,
        "required": ["card"],
        "properties": {
          "card": {
            "type": "string",
            "description": "Iranian bank card number containing exactly 16 ASCII digits.",
            "pattern": "^[0-9]{16}$",
            "minLength": 16,
            "maxLength": 16,
            "example": "6037997512345678"
          }
        }
      },
      "ConvertResponse": {
        "type": "object",
        "required": ["data", "requestId"],
        "properties": {
          "data": {
            "$ref": "#/components/schemas/ConvertData"
          },
          "requestId": {
            "type": "string",
            "example": "SERVER_GENERATED_REQUEST_ID"
          }
        }
      },
      "ConvertData": {
        "type": "object",
        "required": ["iban"],
        "properties": {
          "iban": {
            "type": "string",
            "pattern": "^IR[0-9]{24}$",
            "example": "IR820540102680020817909002"
          }
        }
      },
      "ErrorResponse": {
        "type": "object",
        "required": ["error", "requestId"],
        "properties": {
          "error": {
            "$ref": "#/components/schemas/ErrorDetail"
          },
          "requestId": {
            "type": "string",
            "example": "SERVER_GENERATED_REQUEST_ID"
          }
        }
      },
      "ErrorDetail": {
        "type": "object",
        "required": ["code", "message"],
        "properties": {
          "code": {
            "type": "string",
            "enum": [
              "invalid_card",
              "method_not_allowed",
              "conversion_rejected",
              "internal_error",
              "upstream_failure",
              "upstream_unavailable",
              "upstream_timeout"
            ]
          },
          "message": {
            "type": "string",
            "description": "A user-facing error message in Persian."
          }
        }
      }
    },
    "responses": {
      "InvalidCard": {
        "description": "The JSON body or card number is invalid.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "invalid_card",
                "message": "شماره کارت باید شامل ۱۶ رقم باشد."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      },
      "MethodNotAllowed": {
        "description": "The request method is not supported for this path.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "method_not_allowed",
                "message": "این روش برای این مسیر پشتیبانی نمی‌شود."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      },
      "ConversionRejected": {
        "description": "The upstream service rejected the conversion.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "conversion_rejected",
                "message": "تبدیل این شماره کارت انجام نشد."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      },
      "InternalError": {
        "description": "An internal operation failed.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "internal_error",
                "message": "خطایی در پردازش درخواست رخ داد."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      },
      "UpstreamFailure": {
        "description": "Upstream authentication failed or its response was invalid.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "upstream_failure",
                "message": "ارتباط با سرویس بانکی با خطا روبه‌رو شد."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      },
      "UpstreamUnavailable": {
        "description": "The upstream service is temporarily unavailable.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "upstream_unavailable",
                "message": "سرویس بانکی موقتاً در دسترس نیست."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      },
      "UpstreamTimeout": {
        "description": "The upstream request timed out.",
        "headers": {
          "X-Request-ID": {
            "$ref": "#/components/headers/RequestID"
          }
        },
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/ErrorResponse"
            },
            "example": {
              "error": {
                "code": "upstream_timeout",
                "message": "پاسخ سرویس بانکی بیش از حد طول کشید."
              },
              "requestId": "SERVER_GENERATED_REQUEST_ID"
            }
          }
        }
      }
    }
  }
}