{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/LucioLiu/handoff-protocol/contracts/persistence-contract.schema.json",
  "title": "Persistence contract",
  "description": "Durable artifact obligations independent of host execution mode.",
  "type": "object",
  "additionalProperties": false,
  "required": ["handoff_id", "contract_id", "authoritative_root", "targets"],
  "properties": {
    "handoff_id": {"type": "string", "minLength": 1},
    "contract_id": {"type": "string", "minLength": 1},
    "authoritative_root": {
      "type": "object",
      "additionalProperties": false,
      "required": ["root_id", "resolved_path", "resolution_evidence"],
      "properties": {
        "root_id": {"type": "string", "minLength": 1},
        "resolved_path": {"type": "string", "minLength": 1},
        "resolution_evidence": {"type": "string", "minLength": 1}
      }
    },
    "targets": {
      "type": "array",
      "minItems": 4,
      "maxItems": 4,
      "uniqueItems": true,
      "items": {"$ref": "#/$defs/target"}
    }
  },
  "allOf": [
    {
      "properties": {
        "targets": {
          "contains": {
            "properties": {"target": {"const": "employee_memory"}},
            "required": ["target"]
          },
          "minContains": 1,
          "maxContains": 1
        }
      }
    },
    {
      "properties": {
        "targets": {
          "contains": {
            "properties": {"target": {"const": "employee_worklog"}},
            "required": ["target"]
          },
          "minContains": 1,
          "maxContains": 1
        }
      }
    },
    {
      "properties": {
        "targets": {
          "contains": {
            "properties": {"target": {"const": "team_journal"}},
            "required": ["target"]
          },
          "minContains": 1,
          "maxContains": 1
        }
      }
    },
    {
      "properties": {
        "targets": {
          "contains": {
            "properties": {"target": {"const": "central_board"}},
            "required": ["target"]
          },
          "minContains": 1,
          "maxContains": 1
        }
      }
    }
  ],
  "$defs": {
    "target": {
      "type": "object",
      "additionalProperties": false,
      "required": ["target", "requirement", "writer", "verification"],
      "properties": {
        "target": {
          "enum": ["employee_memory", "employee_worklog", "team_journal", "central_board"]
        },
        "requirement": {"enum": ["required", "not_applicable"]},
        "writer": {"enum": ["recipient", "parent", "single_writer", "none"]},
        "writer_id": {"type": "string", "minLength": 1},
        "path": {"type": "string", "minLength": 1},
        "evidence_nonce": {"type": "string", "minLength": 1},
        "verification": {
          "enum": ["parent_readback", "provider_receipt", "not_applicable"]
        },
        "reason": {"type": "string", "minLength": 1}
      },
      "allOf": [
        {
          "if": {
            "properties": {"requirement": {"const": "required"}},
            "required": ["requirement"]
          },
          "then": {
            "required": ["path", "evidence_nonce"],
            "not": {
              "anyOf": [
                {"properties": {"writer": {"const": "none"}}, "required": ["writer"]},
                {"properties": {"verification": {"const": "not_applicable"}}, "required": ["verification"]}
              ]
            }
          }
        },
        {
          "if": {
            "properties": {"requirement": {"const": "not_applicable"}},
            "required": ["requirement"]
          },
          "then": {
            "properties": {
              "writer": {"const": "none"},
              "verification": {"const": "not_applicable"}
            },
            "required": ["reason"],
            "not": {
              "anyOf": [
                {"required": ["path"]},
                {"required": ["writer_id"]},
                {"required": ["evidence_nonce"]}
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "target": {"const": "central_board"},
              "requirement": {"const": "required"}
            },
            "required": ["target", "requirement"]
          },
          "then": {
            "properties": {"writer": {"enum": ["parent", "single_writer"]}}
          }
        },
        {
          "if": {
            "properties": {
              "target": {
                "enum": ["employee_memory", "employee_worklog"]
              },
              "requirement": {"const": "required"}
            },
            "required": ["target", "requirement"]
          },
          "then": {
            "properties": {
              "writer": {"const": "recipient"},
              "verification": {"const": "parent_readback"}
            }
          }
        },
        {
          "if": {
            "properties": {
              "target": {"const": "team_journal"},
              "requirement": {"const": "required"}
            },
            "required": ["target", "requirement"]
          },
          "then": {
            "properties": {
              "writer": {"const": "recipient"},
              "verification": {"const": "provider_receipt"}
            }
          }
        },
        {
          "if": {
            "properties": {
              "target": {"const": "central_board"},
              "requirement": {"const": "required"}
            },
            "required": ["target", "requirement"]
          },
          "then": {
            "properties": {
              "verification": {"const": "parent_readback"}
            }
          }
        },
        {
          "if": {
            "properties": {"writer": {"const": "single_writer"}},
            "required": ["writer"]
          },
          "then": {"required": ["writer_id"]}
        }
      ]
    }
  }
}