{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "feasibility.schema.v0.2",
  "title": "FeasibilityReport",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "edge_id", "judged_at", "metadata_version",
    "is_runnable", "blockers", "warnings",
    "x_mapping", "y_mapping", "z_summary"
  ],
  "allOf": [
    {
      "description": "02 §10 invariant: is_runnable=false ⇒ blockers MUST be non-empty (a not-runnable edge always carries at least one failure code).",
      "if": {"properties": {"is_runnable": {"const": false}}},
      "then": {"properties": {"blockers": {"minItems": 1}}}
    }
  ],
  "properties": {
    "edge_id": {"type": "string"},
    "judged_at": {"type": "string"},
    "metadata_version": {
      "type": "string",
      "description": "v7 field index version, e.g. 'v7-2026-05'. Renamed from v3_field_index_version (the v3 referred to legacy dataset; switched to v7)."
    },

    "is_runnable": {"type": "boolean"},
    "blockers": {"type": "array", "items": {"type": "string"}},
    "warnings": {"type": "array", "items": {"type": "string"}},

    "x_mapping": {"$ref": "#/$defs/role_mapping_check"},
    "y_mapping": {"$ref": "#/$defs/role_mapping_check"},

    "z_summary": {
      "type": "object",
      "additionalProperties": false,
      "required": ["n_total", "n_mapped", "n_fuzzy", "n_unmapped"],
      "description": "n_mapped + n_fuzzy + n_unmapped must equal n_total. Counts follow 02 §7.2 fuzzy/unmapped split rule by reason.",
      "properties": {
        "n_total": {"type": "integer"},
        "n_mapped": {"type": "integer"},
        "n_fuzzy": {"type": "integer"},
        "n_unmapped": {"type": "integer"}
      }
    },

    "inferred_equation_type": {"type": ["string", "null"]},
    "candidate_estimator": {"type": ["string", "null"]},
    "reasoning": {"type": "string"},
    "data_gap": {
      "anyOf": [
        {"type": "null"},
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["x_concept", "x_reason", "y_concept", "y_reason"],
          "properties": {
            "x_concept": {"type": "string"},
            "x_reason": {"type": "string"},
            "y_concept": {"type": "string"},
            "y_reason": {"type": "string"},
            "recommended_v7_extensions": {
              "type": "array",
              "items": {"type": "string"},
              "description": "Renamed from recommended_v3_extensions; this references HPP field index extensions consistent with v7 dataset naming."
            }
          }
        }
      ]
    },
    "longitudinal": {
      "description": "Additive E3-longitudinal substrate (independent of inferred_equation_type). null when no role resolves to v7. status 'ok' (>=2 research_stage timepoints) signals the planner that a within-subject change / longitudinal dose_response is runnable.",
      "anyOf": [
        {"type": "null"},
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["equation_type", "timepoints", "n_timepoints", "status"],
          "properties": {
            "equation_type": {"const": "E3-longitudinal"},
            "timepoints": {"type": "array", "items": {"type": "string"}},
            "n_timepoints": {"type": "integer"},
            "candidate_estimator": {"type": ["string", "null"], "enum": ["e3_change", "e3_lmm", null]},
            "status": {"type": "string", "enum": ["ok", "degraded", "not_runnable"]},
            "missing": {"type": "array", "items": {"type": "string"}}
          }
        }
      ]
    }
  },
  "$defs": {
    "role_mapping_check": {
      "type": "object",
      "additionalProperties": false,
      "required": ["status", "dataset", "field", "exists_in_v7", "is_container", "value_filter_required"],
      "properties": {
        "status": {
          "type": ["string", "null"],
          "enum": ["exact", "close", "tentative", "missing", null],
          "description": "02 §7.2 mapping status. {exact,close,tentative} are mappable; 'missing'/null fail V1."
        },
        "dataset": {"type": ["string", "null"]},
        "field": {"type": ["string", "null"]},
        "exists_in_v7": {
          "type": "boolean",
          "description": "Renamed from exists_in_v3; verifies dataset.field exists in pseudo_dataset_v8."
        },
        "is_container": {"type": "boolean"},
        "value_filter_required": {"type": "boolean"},
        "value_filter_present": {"type": ["boolean", "null"]},
        "inferred_value_filter": {"type": ["string", "null"]},
        "v7_match_count_expected": {
          "type": ["integer", "null"],
          "description": "Planner pre-estimate of v7 value_filter match count; 0 on placeholder containers like medical_conditions (medications excluded per validation agent scope)."
        }
      }
    }
  }
}