{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "base",
  "title": "Base Resource",
  "description": "Root schema for all game resources. Every resource inherits from this.",
  "type": "object",
  "required": ["id", "name"],
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^[a-z][a-z0-9_]*$",
      "description": "Unique snake_case identifier. Must be globally unique within its category."
    },
    "name": {
      "type": "string",
      "description": "Display name shown in UI and guide."
    },
    "description": {
      "type": "string",
      "description": "Flavor text or functional description."
    },
    "tags": {
      "type": "array",
      "items": { "type": "string" },
      "default": [],
      "description": "Freeform classification tags for filtering and querying."
    },
    "influences": {
      "type": "object",
      "description": "Design lineage. Notes equivalent or inspiring concepts from reference games and systems. Used for attribution and future design alignment, not read by the engine.",
      "properties": {
        "mtg": { "type": "string", "description": "Magic: The Gathering equivalent — creature type, specific cards, or mechanic." },
        "dnd": { "type": "string", "description": "Dungeons & Dragons equivalent — Monster Manual entry, stat block, or sourcebook reference." },
        "mom": { "type": "string", "description": "Master of Magic equivalent — unit, spell, or world feature." },
        "civ": { "type": "string", "description": "Civilization series equivalent — unit, improvement, terrain, or wonder." },
        "freeciv": { "type": "string", "description": "Freeciv / Fantastic Worlds equivalent." },
        "notes": { "type": "string", "description": "General design notes about what was adapted, inverted, or combined from these sources." }
      },
      "additionalProperties": false
    }
  },

  "$defs": {
    "school": {
      "type": "string",
      "enum": ["life", "death", "nature", "aether", "chaos", "generic", "all", "none"]
    },
    "ley_school": {
      "type": "string",
      "enum": ["life", "death", "nature", "aether", "chaos"]
    },
    "mana_source": {
      "type": "object",
      "required": ["school", "amount"],
      "properties": {
        "school": { "$ref": "#/$defs/school" },
        "amount": { "type": "number", "minimum": 0 }
      }
    },
    "color_rgb": {
      "type": "array",
      "items": { "type": "integer", "minimum": 0, "maximum": 255 },
      "minItems": 3,
      "maxItems": 3
    },
    "lifecycle": {
      "$id": "lifecycle",
      "type": "object",
      "description": "Full lifecycle metadata. Describes how this resource forms, evolves, and dies. The engine processes transforms; the guide renders the full chain.",
      "required": ["system", "stage"],
      "properties": {
        "system": {
          "type": "string",
          "description": "Groups resources into lifecycle families for guide display and engine processing.",
          "enum": [
            "volcanic", "river", "glacier", "reef", "forest",
            "cave", "wetland", "desert", "mountain", "coast",
            "permafrost", "lake", "ocean", "spring", "erosion"
          ]
        },
        "stage": {
          "type": "string",
          "description": "Position within the lifecycle.",
          "enum": ["birth", "young", "active", "mature", "dormant", "dying", "dead", "remnant", "terminal"]
        },
        "formed_by": {
          "type": "array",
          "description": "What creates this resource. Engine ignores this; guide uses it to trace lineage backwards.",
          "items": {
            "type": "object",
            "required": ["source", "mechanism"],
            "properties": {
              "source": {
                "type": "string",
                "description": "ID of the source resource (terrain, event, etc.)."
              },
              "mechanism": {
                "type": "string",
                "enum": ["time", "event", "climate", "accumulation", "map_gen"],
                "description": "How the formation happens."
              },
              "event_category": {
                "type": "string",
                "description": "If mechanism=event, which event category triggers formation."
              },
              "min_tier": {
                "type": "integer",
                "description": "If mechanism=event, minimum event tier required."
              },
              "condition": {
                "type": "string",
                "description": "Readable condition for when this formation path applies."
              }
            }
          }
        },
        "transforms": {
          "type": "array",
          "description": "Ordered list of possible transformations. First matching condition wins per turn.",
          "items": {
            "type": "object",
            "required": ["to", "condition"],
            "properties": {
              "to": {
                "type": "string",
                "description": "Target resource ID after transformation."
              },
              "condition": {
                "type": "string",
                "enum": ["default", "event", "climate", "accumulation", "depletion"],
                "description": "What triggers this transform. 'default' = time-based countdown (engine processes). Others = external trigger (event system, climate thresholds, resource accumulation/depletion)."
              },
              "turns": {
                "type": "integer",
                "minimum": 1,
                "description": "Duration in turns for condition=default. Scaled by world transform_rate_multiplier."
              },
              "event_category": {
                "type": "string",
                "description": "For condition=event: which event category triggers this."
              },
              "min_tier": {
                "type": "integer",
                "description": "For condition=event: minimum event tier."
              },
              "climate_field": {
                "type": "string",
                "description": "For condition=climate: which TileState field to check (temperature, moisture, surface_water, etc.)."
              },
              "climate_op": {
                "type": "string",
                "enum": ["<", "<=", ">", ">="],
                "description": "For condition=climate: comparison operator."
              },
              "climate_value": {
                "type": "number",
                "description": "For condition=climate: threshold value."
              },
              "climate_sustained_turns": {
                "type": "integer",
                "description": "For condition=climate: how many consecutive turns the condition must hold."
              },
              "chance": {
                "type": "number",
                "minimum": 0,
                "maximum": 1,
                "description": "Probability [0,1] that this transform fires when condition is met. 1.0 = always."
              },
              "description": {
                "type": "string",
                "description": "Readable explanation for the guide."
              }
            }
          }
        }
      }
    }
  }
}