{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0",
    "title": "SMS Verification API",
    "description": "A comprehensive SMS verification API using AWS SNS HTTP API with Hono server on Cloudflare Workers. **Authentication Required**: All endpoints except `/health`, `/docs`, and `/openapi.json` require API key authentication.",
    "contact": { "name": "API Support", "email": "support@example.com" },
    "license": { "name": "MIT", "url": "https://opensource.org/licenses/MIT" }
  },
  "servers": [
    {
      "url": "https://sms-verification-api.your-subdomain.workers.dev",
      "description": "Production server"
    },
    {
      "url": "https://sms-verification-api-staging.your-subdomain.workers.dev",
      "description": "Staging server"
    }
  ],
  "components": { "schemas": {}, "parameters": {} },
  "security": [{ "ApiKeyAuth": [] }, { "BearerAuth": [] }],
  "paths": {
    "/health": {
      "get": {
        "tags": ["health"],
        "summary": "Health check",
        "description": "Returns the health status of the API server",
        "responses": {
          "200": {
            "description": "Health check successful",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "status": { "type": "string", "example": "ok" },
                    "timestamp": {
                      "type": "string",
                      "example": "2024-01-01T00:00:00.000Z"
                    },
                    "server": {
                      "type": "string",
                      "example": "Hono on Cloudflare Workers"
                    }
                  },
                  "required": ["status", "timestamp", "server"]
                }
              }
            }
          }
        }
      }
    },
    "/api/send-verification": {
      "post": {
        "tags": ["verification"],
        "summary": "Send SMS verification code",
        "description": "Sends a 6-digit verification code to the specified phone number via SMS. Optionally accepts a custom code.",
        "security": [{ "ApiKeyAuth": [] }, { "BearerAuth": [] }],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "properties": {
                  "phoneNumber": {
                    "type": "string",
                    "pattern": "^\\+[1-9]\\d{1,14}$",
                    "description": "Phone number in E.164 format",
                    "example": "+1234567890"
                  },
                  "code": {
                    "type": "string",
                    "minLength": 6,
                    "maxLength": 6,
                    "pattern": "^\\d{6}$",
                    "description": "Optional custom 6-digit verification code. If not provided, a random code will be generated.",
                    "example": "123456"
                  }
                },
                "required": ["phoneNumber"]
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Verification code sent successfully",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "success": { "type": "boolean", "example": true },
                    "message": {
                      "type": "string",
                      "example": "Verification code sent successfully"
                    },
                    "messageId": {
                      "type": "string",
                      "example": "aws-message-id-123"
                    },
                    "expiresIn": {
                      "type": "number",
                      "description": "Expiration time in seconds",
                      "example": 600
                    }
                  },
                  "required": ["success", "message", "messageId", "expiresIn"]
                }
              }
            }
          },
          "400": {
            "description": "Bad request - invalid phone number or other validation error",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "error": {
                      "type": "string",
                      "example": "Validation error"
                    },
                    "details": {
                      "type": "string",
                      "example": "Additional error details"
                    }
                  },
                  "required": ["error"]
                }
              }
            }
          },
          "429": {
            "description": "Too many requests - rate limited",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "error": {
                      "type": "string",
                      "example": "Please wait before requesting another code"
                    },
                    "retryAfter": {
                      "type": "number",
                      "description": "Seconds to wait before retry",
                      "example": 30
                    }
                  },
                  "required": ["error", "retryAfter"]
                }
              }
            }
          },
          "500": {
            "description": "Internal server error",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "error": {
                      "type": "string",
                      "example": "Validation error"
                    },
                    "details": {
                      "type": "string",
                      "example": "Additional error details"
                    }
                  },
                  "required": ["error"]
                }
              }
            }
          }
        }
      }
    },
    "/api/verify-code": {
      "post": {
        "tags": ["verification"],
        "summary": "Verify SMS code",
        "description": "Verifies the submitted code against the sent verification code",
        "security": [{ "ApiKeyAuth": [] }, { "BearerAuth": [] }],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "properties": {
                  "phoneNumber": {
                    "type": "string",
                    "pattern": "^\\+[1-9]\\d{1,14}$",
                    "description": "Phone number in E.164 format",
                    "example": "+1234567890"
                  },
                  "code": {
                    "type": "string",
                    "minLength": 6,
                    "maxLength": 6,
                    "pattern": "^\\d{6}$",
                    "description": "6-digit verification code",
                    "example": "123456"
                  }
                },
                "required": ["phoneNumber", "code"]
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Phone number verified successfully",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "success": { "type": "boolean", "example": true },
                    "message": {
                      "type": "string",
                      "example": "Phone number verified successfully"
                    },
                    "verificationToken": {
                      "type": "string",
                      "example": "unique-verification-token"
                    },
                    "phoneNumber": {
                      "type": "string",
                      "pattern": "^\\+[1-9]\\d{1,14}$",
                      "description": "Phone number in E.164 format",
                      "example": "+1234567890"
                    }
                  },
                  "required": [
                    "success",
                    "message",
                    "verificationToken",
                    "phoneNumber"
                  ]
                }
              }
            }
          },
          "400": {
            "description": "Bad request - invalid code or expired",
            "content": {
              "application/json": {
                "schema": {
                  "anyOf": [
                    {
                      "type": "object",
                      "properties": {
                        "error": {
                          "type": "string",
                          "example": "Validation error"
                        },
                        "details": {
                          "type": "string",
                          "example": "Additional error details"
                        }
                      },
                      "required": ["error"]
                    },
                    {
                      "type": "object",
                      "properties": {
                        "error": {
                          "type": "string",
                          "example": "Invalid verification code"
                        },
                        "attemptsRemaining": { "type": "number", "example": 3 }
                      },
                      "required": ["error", "attemptsRemaining"]
                    }
                  ]
                }
              }
            }
          },
          "429": {
            "description": "Too many verification attempts",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "error": {
                      "type": "string",
                      "example": "Validation error"
                    },
                    "details": {
                      "type": "string",
                      "example": "Additional error details"
                    }
                  },
                  "required": ["error"]
                }
              }
            }
          },
          "500": {
            "description": "Internal server error",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "properties": {
                    "error": {
                      "type": "string",
                      "example": "Validation error"
                    },
                    "details": {
                      "type": "string",
                      "example": "Additional error details"
                    }
                  },
                  "required": ["error"]
                }
              }
            }
          }
        }
      }
    }
  }
}