{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://isdf.dev/schemas/v0.1.0/ud.schema.json",
  "title": "Universal Document (UD) — iSDF v0.1.0",
  "description": "JSON Schema for Universal Document Reviewable (UDR) and Universal Document Sealed (UDS) files.",
  "type": "object",
  "required": ["ud_version", "state", "metadata", "manifest", "blocks"],
  "additionalProperties": false,

  "properties": {

    "ud_version": {
      "type": "string",
      "pattern": "^\\d+\\.\\d+\\.\\d+$",
      "description": "Semantic version of the iSDF spec this document conforms to."
    },

    "state": {
      "type": "string",
      "enum": ["UDR", "UDS"],
      "description": "UDR = editable. UDS = sealed and immutable."
    },

    "metadata": {
      "type": "object",
      "required": ["id", "title", "created_at", "updated_at", "created_by", "revoked"],
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "string",
          "format": "uuid",
          "description": "UUID v4 unique identifier for this document."
        },
        "title": {
          "type": "string",
          "minLength": 1
        },
        "created_at": {
          "type": "string",
          "format": "date-time"
        },
        "updated_at": {
          "type": "string",
          "format": "date-time"
        },
        "created_by": {
          "type": "string",
          "minLength": 1
        },
        "organisation": {
          "type": "string"
        },
        "document_type": {
          "type": "string"
        },
        "tags": {
          "type": "array",
          "items": { "type": "string" }
        },
        "expiry": {
          "type": "string",
          "format": "date-time"
        },
        "revoked": {
          "type": "boolean"
        },
        "revocation_url": {
          "type": "string",
          "format": "uri"
        }
      }
    },

    "manifest": {
      "type": "object",
      "required": ["base_language", "language_manifest", "clarity_layer_manifest", "permissions"],
      "additionalProperties": false,
      "properties": {

        "base_language": {
          "type": "string"
        },

        "language_manifest": {
          "type": "array",
          "minItems": 1,
          "items": {
            "type": "object",
            "required": ["code", "label"],
            "additionalProperties": false,
            "properties": {
              "code": { "type": "string" },
              "label": { "type": "string" },
              "direction": {
                "type": "string",
                "enum": ["ltr", "rtl"],
                "default": "ltr"
              }
            }
          }
        },

        "clarity_layer_manifest": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["id", "label"],
            "additionalProperties": false,
            "properties": {
              "id": {
                "type": "string",
                "pattern": "^[a-z0-9_-]+$"
              },
              "label": { "type": "string" }
            }
          }
        },

        "permissions": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "allow_copy": { "type": "boolean" },
            "allow_print": { "type": "boolean" },
            "allow_export": { "type": "boolean" },
            "require_auth": { "type": "boolean" },
            "audience": {
              "type": "array",
              "items": { "type": "string" }
            }
          }
        }
      }
    },

    "blocks": {
      "type": "array",
      "minItems": 0,
      "items": {
        "type": "object",
        "required": ["id", "type", "base_content"],
        "additionalProperties": false,
        "properties": {
          "id": {
            "type": "string",
            "minLength": 1
          },
          "type": {
            "type": "string",
            "enum": ["paragraph", "heading", "table", "list", "image", "code", "divider", "custom"]
          },
          "base_content": {
            "type": "object"
          },
          "clarity": {
            "type": "object",
            "additionalProperties": {
              "type": "object",
              "additionalProperties": { "type": "string" }
            }
          },
          "translations": {
            "type": "object",
            "additionalProperties": { "type": "string" }
          },
          "hidden": {
            "type": "boolean",
            "default": false
          },
          "audience": {
            "type": "array",
            "items": { "type": "string" }
          },
          "provenance": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
              "source": { "type": "string" },
              "imported_from": { "type": "string" },
              "imported_at": { "type": "string", "format": "date-time" }
            }
          }
        }
      }
    },

    "clarity_layers": {
      "type": "object",
      "description": "Document-level enrichment layers added by UD utilities (summaries, classification, accessibility reports, media sync, etc.)."
    },

    "provenance": {
      "type": "object",
      "description": "Provenance metadata added by UD utilities and converters."
    },

    "media_sync": {
      "type": "object",
      "description": "Media synchronisation data added by UD Media Sync utility."
    },

    "media_sync_advanced": {
      "type": "object",
      "description": "Advanced media synchronisation data added by UD Media Sync Advanced utility."
    },

    "classification": {
      "type": "string",
      "description": "Security classification assigned by UD Classify utility."
    },

    "contract_intelligence": {
      "type": "object",
      "description": "Structured contract analysis produced by UD Contract Intelligence utility."
    },

    "seal": {
      "type": "object",
      "required": ["sealed_at", "sealed_by", "hash", "chain_of_custody"],
      "additionalProperties": false,
      "properties": {
        "sealed_at": { "type": "string", "format": "date-time" },
        "sealed_by": { "type": "string" },
        "hash": {
          "type": "string",
          "pattern": "^[a-f0-9]{64}$"
        },
        "signature": { "type": "string" },
        "verification_url": { "type": "string", "format": "uri" },
        "blockchain": { "type": ["string", "null"] },
        "chain_of_custody": {
          "type": "array",
          "minItems": 1,
          "items": {
            "type": "object",
            "required": ["event", "actor", "timestamp"],
            "additionalProperties": false,
            "properties": {
              "event": {
                "type": "string",
                "enum": ["created", "edited", "reviewed", "approved", "sealed", "shared", "revoked"]
              },
              "actor": { "type": "string" },
              "timestamp": { "type": "string", "format": "date-time" },
              "note": { "type": "string" }
            }
          }
        }
      }
    }
  },

  "if": {
    "properties": { "state": { "const": "UDS" } }
  },
  "then": {
    "required": ["seal"]
  },
  "else": {
    "properties": {
      "seal": { "not": {} }
    }
  }
}