{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Ralpha Asset Catalogue",
  "description": "Machine-readable index of all assets in ralpha-ue5",
  "type": "object",
  "required": ["version", "generated_at", "assets"],
  "properties": {
    "version": {
      "type": "string",
      "pattern": "^\\d+\\.\\d+\\.\\d+$"
    },
    "generated_at": {
      "type": "string",
      "format": "date-time"
    },
    "asset_count": {
      "type": "integer"
    },
    "categories": {
      "type": "array",
      "items": { "type": "string" }
    },
    "assets": {
      "type": "array",
      "items": { "$ref": "#/definitions/Asset" }
    }
  },
  "definitions": {
    "Asset": {
      "type": "object",
      "required": ["id", "name", "category", "unreal_path"],
      "properties": {
        "id": {
          "type": "string",
          "description": "Stable unique identifier (snake_case)",
          "pattern": "^[a-z][a-z0-9_]*$"
        },
        "name": {
          "type": "string",
          "description": "Human-readable display name"
        },
        "category": {
          "type": "string",
          "description": "Category path (e.g., Furniture/Seating)"
        },
        "unreal_path": {
          "type": "string",
          "description": "Full Unreal asset path",
          "pattern": "^/Game/"
        },
        "tags": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Searchable tags/synonyms"
        },
        "thumbnail": {
          "type": "string",
          "description": "Relative path to thumbnail image"
        },
        "bounds": {
          "type": "object",
          "description": "Bounding box in cm",
          "properties": {
            "x": { "type": "number" },
            "y": { "type": "number" },
            "z": { "type": "number" }
          }
        },
        "pivot": {
          "type": "string",
          "enum": ["bottom_center", "center", "bottom_back", "custom"],
          "default": "bottom_center"
        },
        "placement_modes": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": ["floor", "wall", "ceiling", "surface", "hanging", "floating"]
          },
          "default": ["floor"]
        },
        "collision": {
          "type": "boolean",
          "default": true
        },
        "lods": {
          "type": "integer",
          "description": "Number of LOD levels"
        },
        "triangle_count": {
          "type": "integer",
          "description": "LOD0 triangle count"
        },
        "materials": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Material slot names"
        },
        "variants": {
          "type": "array",
          "items": { "type": "string" },
          "description": "IDs of variant assets (e.g., color options)"
        },
        "license": {
          "type": "object",
          "properties": {
            "type": {
              "type": "string",
              "enum": ["CC0", "CC-BY", "CC-BY-SA", "Megascans", "Marketplace", "Custom", "Restricted"]
            },
            "source": { "type": "string" },
            "attribution": { "type": "string" }
          }
        },
        "added_at": {
          "type": "string",
          "format": "date-time"
        }
      }
    }
  }
}