{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://dills122.github.io/footy-data-kit/schemas/football-data.schema.json",
  "title": "FootballData",
  "description": "Merged English football season dataset. Season records contain a seasonInfo summary and zero or more tierN league-table records.",
  "type": "object",
  "required": ["seasons"],
  "additionalProperties": false,
  "properties": {
    "metadata": {
      "$ref": "#/definitions/DatasetMetadata"
    },
    "clubs": {
      "$ref": "#/definitions/ClubsMap",
      "description": "Optional embedded club metadata. Release assets normally publish club metadata as a sidecar file instead."
    },
    "seasons": {
      "$ref": "#/definitions/SeasonsMap"
    }
  },
  "definitions": {
    "DatasetMetadata": {
      "type": "object",
      "description": "Build provenance for a generated FootballData export.",
      "additionalProperties": false,
      "properties": {
        "schemaVersion": {
          "type": "integer",
          "description": "Version of the generated dataset contract."
        },
        "generator": {
          "type": ["string", "null"],
          "description": "Generator or merge command that produced this export."
        },
        "generatedAt": {
          "type": ["string", "null"],
          "format": "date-time",
          "description": "ISO timestamp for the data generation run."
        },
        "gitSha": {
          "type": ["string", "null"],
          "description": "Git commit SHA used for the data generation run."
        },
        "sourceFiles": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Input files used to build the export."
        },
        "buildOptions": {
          "type": "object",
          "additionalProperties": {
            "type": ["string", "number", "boolean", "null"]
          },
          "description": "Selected build options captured as primitive values."
        }
      }
    },
    "SeasonsMap": {
      "type": "object",
      "description": "Map of starting season year to season data. For example, 2025 means the 2025-26 season.",
      "patternProperties": {
        "^\\d{4}$": {
          "$ref": "#/definitions/SeasonData"
        }
      },
      "additionalProperties": false
    },
    "SeasonData": {
      "type": "object",
      "description": "A single season. Wartime or abandoned placeholder seasons may contain only seasonInfo.",
      "required": ["seasonInfo"],
      "properties": {
        "seasonInfo": {
          "$ref": "#/definitions/SeasonInfo"
        }
      },
      "patternProperties": {
        "^tier\\d+$": {
          "$ref": "#/definitions/TierData"
        }
      },
      "additionalProperties": false
    },
    "SeasonInfo": {
      "type": "object",
      "description": "Season-level summary. promoted and relegated describe movement into and out of the next season's top flight.",
      "required": ["season", "table", "relegated", "promoted"],
      "additionalProperties": false,
      "properties": {
        "season": {
          "type": "integer",
          "description": "Starting year for the season."
        },
        "table": {
          "type": "array",
          "maxItems": 0,
          "description": "Always empty. seasonInfo is a summary object, not a league table."
        },
        "relegated": {
          "$ref": "#/definitions/StringList"
        },
        "promoted": {
          "$ref": "#/definitions/StringList"
        },
        "seasonSlug": {
          "type": ["string", "null"]
        },
        "sourceUrl": {
          "type": ["string", "null"],
          "format": "uri"
        },
        "tableCount": {
          "type": ["integer", "null"]
        },
        "competitionStatus": {
          "type": ["string", "null"]
        },
        "warSuspensionLabel": {
          "type": ["string", "null"]
        },
        "officialLeagueTables": {
          "type": ["boolean", "null"]
        },
        "officialCompetitionsSuspended": {
          "type": ["boolean", "null"]
        },
        "officialCompetitionsAbandoned": {
          "type": ["boolean", "null"]
        },
        "regionalBridgeSeason": {
          "type": ["boolean", "null"]
        },
        "promotionRelegationApplies": {
          "type": ["boolean", "null"]
        },
        "specialCompetitions": {
          "$ref": "#/definitions/StringList"
        },
        "leagueStructureSpecialCases": {
          "type": "array",
          "description": "Known structural exceptions for a season, such as parallel regional leagues or restructure placement rules.",
          "items": {
            "$ref": "#/definitions/LeagueStructureSpecialCase"
          }
        },
        "notes": {
          "type": ["string", "null"]
        }
      }
    },
    "LeagueStructureSpecialCase": {
      "type": "object",
      "description": "A documented league-structure exception attached to a season summary.",
      "required": ["type", "levels", "tierKeys"],
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string"
        },
        "levels": {
          "type": "array",
          "items": {
            "type": "integer"
          }
        },
        "tierKeys": {
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^tier\\d+$"
          }
        },
        "notes": {
          "type": ["string", "null"]
        }
      }
    },
    "TierData": {
      "type": "object",
      "description": "League-table data for one tier in a season.",
      "required": ["season", "table", "relegated", "promoted"],
      "additionalProperties": false,
      "properties": {
        "season": {
          "type": "integer"
        },
        "table": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/LeagueTableEntry"
          }
        },
        "relegated": {
          "$ref": "#/definitions/StringList"
        },
        "promoted": {
          "$ref": "#/definitions/StringList"
        },
        "metadata": {
          "$ref": "#/definitions/TierMetadata"
        },
        "divisions": {
          "type": "array",
          "description": "Parallel league tables that share this pyramid level.",
          "items": {
            "$ref": "#/definitions/TierDivisionData"
          }
        }
      }
    },
    "TierDivisionData": {
      "type": "object",
      "description": "One league table inside a parallel tier.",
      "required": ["season", "table", "relegated", "promoted"],
      "additionalProperties": false,
      "properties": {
        "season": {
          "type": "integer"
        },
        "table": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/LeagueTableEntry"
          }
        },
        "relegated": {
          "$ref": "#/definitions/StringList"
        },
        "promoted": {
          "$ref": "#/definitions/StringList"
        },
        "metadata": {
          "$ref": "#/definitions/TierMetadata"
        }
      }
    },
    "LeagueTableEntry": {
      "type": "object",
      "description": "One final league-table row.",
      "required": [
        "pos",
        "team",
        "played",
        "won",
        "drawn",
        "lost",
        "goalsFor",
        "goalsAgainst",
        "goalDifference",
        "goalAverage",
        "points",
        "notes",
        "wasRelegated",
        "wasPromoted",
        "isExpansionTeam",
        "wasReElected",
        "wasReprieved",
        "outcomeStatus"
      ],
      "additionalProperties": false,
      "properties": {
        "pos": {
          "type": "integer",
          "minimum": 1
        },
        "team": {
          "type": "string"
        },
        "played": {
          "type": "integer",
          "minimum": 0
        },
        "won": {
          "type": "integer",
          "minimum": 0
        },
        "drawn": {
          "type": "integer",
          "minimum": 0
        },
        "lost": {
          "type": "integer",
          "minimum": 0
        },
        "goalsFor": {
          "type": "integer"
        },
        "goalsAgainst": {
          "type": "integer"
        },
        "goalDifference": {
          "type": ["integer", "null"]
        },
        "goalAverage": {
          "type": ["number", "null"]
        },
        "points": {
          "type": "integer"
        },
        "notes": {
          "type": ["string", "null"]
        },
        "wasRelegated": {
          "type": "boolean"
        },
        "wasPromoted": {
          "type": "boolean"
        },
        "isExpansionTeam": {
          "type": "boolean"
        },
        "wasReElected": {
          "type": "boolean"
        },
        "wasReprieved": {
          "type": "boolean"
        },
        "outcomeStatus": {
          "type": ["string", "null"],
          "description": "Administrative or exceptional row outcome, such as expelled, folded, resigned, failed-re-election-and-demoted, reprieved, or relegated-after-points-deduction. Null for ordinary rows."
        }
      }
    },
    "TierMetadata": {
      "type": "object",
      "description": "Source and table-selection metadata for a tier record.",
      "additionalProperties": false,
      "properties": {
        "source": {
          "type": "string"
        },
        "sourceUrl": {
          "type": ["string", "null"],
          "format": "uri"
        },
        "seasonSlug": {
          "type": ["string", "null"]
        },
        "leagueId": {
          "type": ["string", "null"]
        },
        "title": {
          "type": ["string", "null"]
        },
        "leagueLevel": {
          "type": ["integer", "null"]
        },
        "structure": {
          "type": ["string", "null"],
          "enum": ["single-league", "parallel-leagues", null]
        },
        "parallelGroup": {
          "type": ["string", "null"]
        },
        "divisionKey": {
          "type": ["string", "null"]
        },
        "divisionCount": {
          "type": ["integer", "null"]
        },
        "tableIndex": {
          "type": ["integer", "null"]
        },
        "tableCount": {
          "type": ["integer", "null"]
        },
        "tierKey": {
          "type": ["string", "null"],
          "pattern": "^tier\\d+$"
        }
      }
    },
    "ClubsMap": {
      "type": "object",
      "patternProperties": {
        "^[a-z0-9][a-z0-9 -]*$": {
          "$ref": "club-metadata.schema.json#/definitions/ClubMetadata"
        }
      },
      "additionalProperties": false
    },
    "StringList": {
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  }
}