{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://example.com/user-profile.json",
  "title": "User Profile Schema",
  "description": "A comprehensive user profile schema using allOf with multiple constraints",
  "type": "object",
  "allOf": [
    {
      "description": "Basic user information constraints",
      "type": "object",
      "properties": {
        "id": {
          "type": "integer",
          "minimum": 1
        },
        "username": {
          "type": "string",
          "minLength": 3,
          "maxLength": 30
        }
      },
      "required": ["id", "username"]
    },
    {
      "description": "Personal details constraints",
      "type": "object",
      "properties": {
        "firstName": {
          "type": "string",
          "minLength": 1,
          "maxLength": 50
        },
        "lastName": {
          "type": "string",
          "minLength": 1,
          "maxLength": 50
        },
        "age": {
          "type": "integer",
          "minimum": 13,
          "maximum": 120
        }
      },
      "required": ["firstName", "lastName"]
    },
    {
      "description": "Contact information constraints",
      "type": "object",
      "properties": {
        "email": {
          "type": "string",
          "format": "email"
        },
        "phone": {
          "type": "string",
          "pattern": "^\\+?[1-9]\\d{1,14}$"
        }
      },
      "required": ["email"]
    },
    {
      "description": "Address constraints",
      "type": "object",
      "properties": {
        "address": {
          "type": "object",
          "properties": {
            "street": {
              "type": "string",
              "minLength": 1
            },
            "city": {
              "type": "string",
              "minLength": 1
            },
            "postalCode": {
              "type": "string",
              "pattern": "^[A-Z0-9\\s-]{3,10}$"
            },
            "country": {
              "type": "string",
              "enum": [
                "US",
                "CA",
                "GB",
                "DE",
                "FR",
                "AU",
                "JP",
                "BR",
                "IN",
                "MX"
              ]
            }
          },
          "required": ["street", "city", "country"]
        }
      }
    },
    {
      "description": "Account status and role constraints",
      "type": "object",
      "properties": {
        "status": {
          "type": "string",
          "enum": ["active", "inactive", "suspended", "pending"]
        },
        "role": {
          "type": "string",
          "enum": ["user", "moderator", "admin", "superuser"]
        },
        "verified": {
          "type": "boolean"
        }
      },
      "required": ["status", "role"]
    },
    {
      "description": "Timestamps constraints",
      "type": "object",
      "properties": {
        "createdAt": {
          "type": "string",
          "format": "date-time"
        },
        "lastLoginAt": {
          "type": "string",
          "format": "date-time"
        },
        "updatedAt": {
          "type": "string",
          "format": "date-time"
        }
      },
      "required": ["createdAt"]
    },
    {
      "description": "Preferences and settings constraints",
      "type": "object",
      "properties": {
        "preferences": {
          "type": "object",
          "properties": {
            "theme": {
              "type": "string",
              "enum": ["light", "dark", "auto"]
            },
            "language": {
              "type": "string",
              "pattern": "^[a-z]{2}(-[A-Z]{2})?$"
            },
            "timezone": {
              "type": "string",
              "pattern": "^[A-Za-z_/]+$"
            },
            "notifications": {
              "type": "object",
              "properties": {
                "email": {
                  "type": "boolean"
                },
                "sms": {
                  "type": "boolean"
                },
                "push": {
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        }
      }
    },
    {
      "description": "Profile completeness constraints",
      "type": "object",
      "properties": {
        "profileCompletion": {
          "type": "number",
          "minimum": 0,
          "maximum": 100
        },
        "avatar": {
          "type": "string",
          "format": "uri"
        }
      }
    },
    {
      "description": "Social media links constraints",
      "type": "object",
      "properties": {
        "socialLinks": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "platform": {
                "type": "string",
                "enum": [
                  "twitter",
                  "linkedin",
                  "github",
                  "facebook",
                  "instagram"
                ]
              },
              "url": {
                "type": "string",
                "format": "uri"
              }
            },
            "required": ["platform", "url"],
            "additionalProperties": false
          },
          "maxItems": 5,
          "uniqueItems": true
        }
      }
    },
    {
      "description": "Security constraints",
      "type": "object",
      "properties": {
        "twoFactorEnabled": {
          "type": "boolean"
        },
        "lastPasswordChange": {
          "type": "string",
          "format": "date-time"
        },
        "loginAttempts": {
          "type": "integer",
          "minimum": 0,
          "maximum": 10
        }
      }
    },
    {
      "description": "Subscription and billing constraints",
      "type": "object",
      "properties": {
        "subscription": {
          "type": "object",
          "properties": {
            "plan": {
              "type": "string",
              "enum": ["free", "basic", "premium", "enterprise"]
            },
            "status": {
              "type": "string",
              "enum": ["active", "cancelled", "expired", "trialing"]
            },
            "expiresAt": {
              "type": "string",
              "format": "date-time"
            }
          },
          "required": ["plan", "status"]
        }
      }
    },
    {
      "description": "Activity tracking constraints",
      "type": "object",
      "properties": {
        "activityScore": {
          "type": "number",
          "minimum": 0,
          "maximum": 1000
        },
        "tags": {
          "type": "array",
          "items": {
            "type": "string",
            "minLength": 1,
            "maxLength": 20
          },
          "maxItems": 10,
          "uniqueItems": true
        }
      }
    }
  ],
  "additionalProperties": false
}