{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/DY-2026/GameDesignOS/main/contracts/evidence-ledger.schema.json",
  "title": "GameDesignOS v1 Evidence Ledger",
  "oneOf": [
    { "$ref": "#/$defs/ledger" },
    { "$ref": "#/$defs/single_evidence" }
  ],
  "$defs": {
    "ledger": {
      "type": "object",
      "required": ["schema_version", "workspace_id", "evidence"],
      "additionalProperties": false,
      "properties": {
        "schema_version": { "type": "string", "const": "1.0.0" },
        "workspace_id": { "type": "string", "minLength": 1 },
        "evidence": {
          "type": "array",
          "items": { "$ref": "#/$defs/evidence" }
        }
      }
    },
    "single_evidence": {
      "allOf": [
        { "$ref": "#/$defs/evidence" },
        { "required": ["schema_version"] }
      ]
    },
    "evidence": {
      "type": "object",
      "required": [
        "evidence_id",
        "source_type",
        "source_status",
        "summary",
        "confidence",
        "decision_impact",
        "used_by_decisions",
        "used_by_assumptions",
        "unsupported_claims"
      ],
      "additionalProperties": false,
      "properties": {
        "schema_version": { "type": "string", "const": "1.0.0" },
        "evidence_id": { "type": "string", "pattern": "^EVD-[A-Z0-9-]{3,}$" },
        "source_type": {
          "enum": ["screenshot", "video", "playtest", "interview", "data", "benchmark", "inference", "experience", "other"]
        },
        "source_status": {
          "enum": ["private", "synthetic", "public", "cleared", "needs_review"]
        },
        "summary": { "type": "string", "minLength": 1 },
        "confidence": { "enum": ["low", "medium", "high"] },
        "decision_impact": { "type": "string" },
        "used_by_decisions": {
          "type": "array",
          "items": { "type": "string", "pattern": "^DEC-[A-Z0-9-]{3,}$" },
          "uniqueItems": true
        },
        "used_by_assumptions": {
          "type": "array",
          "items": { "type": "string", "pattern": "^ASM-[A-Z0-9-]{3,}$" },
          "uniqueItems": true
        },
        "unsupported_claims": {
          "type": "array",
          "items": { "type": "string", "minLength": 1 }
        }
      }
    }
  }
}