{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://covibes.dev/asp/schemas/changeset.schema.json",
  "title": "ChangeSet",
  "description": "A content-addressed delta over a SnapshotRef/Baseline. ASP Core v1.0 reuses this immutable candidate input without a Core-only schema fork. before/after are blob content-hashes, never inline bytes. The after-state is baseline overlaid with these changes. Hosts normalize accepted EditPlans into this invariant before validation and apply.",
  "type": "object",
  "required": ["baseline", "changes"],
  "additionalProperties": false,
  "properties": {
    "baseline": { "$ref": "#/$defs/baseline", "description": "v1.0 field alias for the canonical SnapshotRef object." },
    "changes": {
      "type": "array",
      "items": { "$ref": "#/$defs/change" }
    }
  },
  "$defs": {
    "snapshotRef": {
      "type": "object",
      "title": "SnapshotRef",
      "required": ["rev"],
      "additionalProperties": false,
      "properties": {
        "rev": { "type": "string", "description": "Content-addressed tree hash, e.g. git:tree:9f3a1c." },
        "dirty": { "type": "string", "description": "Digest of the uncommitted overlay, if any." },
        "stampedAt": { "type": "string", "format": "date-time" }
      }
    },
    "baseline": {
      "$ref": "#/$defs/snapshotRef",
      "description": "Transitional schema alias for SnapshotRef used by v1.0 fixtures and compatibility payloads."
    },
    "blobRef": {
      "type": "string",
      "pattern": "^blob:[a-z0-9]+:[0-9a-f]+$",
      "description": "Content hash, e.g. blob:sha256:bb…"
    },
    "change": {
      "type": "object",
      "required": ["path", "kind"],
      "additionalProperties": false,
      "properties": {
        "path": { "type": "string" },
        "kind": { "enum": ["create", "modify", "delete", "rename"] },
        "from": { "type": "string", "description": "Prior path, for kind = rename." },
        "before": { "$ref": "#/$defs/blobRef", "description": "Required for modify/delete/rename." },
        "after": { "$ref": "#/$defs/blobRef", "description": "Required for create/modify. On a content-changing rename, the new content blob; a pure rename may omit it (after === before)." }
      },
      "allOf": [
        { "if": { "properties": { "kind": { "const": "create" } } }, "then": { "required": ["after"] } },
        { "if": { "properties": { "kind": { "const": "modify" } } }, "then": { "required": ["before", "after"] } },
        { "if": { "properties": { "kind": { "const": "delete" } } }, "then": { "required": ["before"] } },
        { "if": { "properties": { "kind": { "const": "rename" } } }, "then": { "required": ["from", "before"] } }
      ]
    }
  }
}