{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://lowlysre.github.io/gh-pixel-editor/spec/sprite.schema.json",
  "title": "Pixel sprite",
  "description": "A pixel sprite for terminals with 256 colours. See https://lowlysre.github.io/gh-pixel-editor/",
  "type": "object",
  "required": ["version", "name", "rows", "legend"],
  "additionalProperties": false,
  "properties": {
    "version": { "const": 1 },
    "name": { "type": "string", "pattern": "^[a-z][a-z0-9-]*$" },
    "mirror": {
      "type": "boolean",
      "default": false,
      "description": "Rows are the left half; the right half is their mirror."
    },
    "rows": {
      "type": "array",
      "minItems": 1,
      "items": { "type": "string", "minLength": 1, "pattern": "^[^\\s]+$" },
      "description": "One character per pixel. '.' is transparent. Rows pad with their last character."
    },
    "legend": { "$ref": "#/$defs/legend" },
    "lighting": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "dither": { "type": "number", "minimum": 0, "default": 0.9 },
        "rim": { "type": "number", "minimum": 0, "default": 1.6 }
      }
    },
    "tiers": {
      "type": "object",
      "propertyNames": { "pattern": "^[1-9][0-9]*$" },
      "additionalProperties": { "$ref": "#/$defs/legend" },
      "description": "Palette variants. Each tier replaces only the legend entries it lists."
    }
  },
  "$defs": {
    "color": { "type": "integer", "minimum": 0, "maximum": 255 },
    "legend": {
      "type": "object",
      "propertyNames": { "pattern": "^[^\\s.]$" },
      "additionalProperties": {
        "oneOf": [
          { "$ref": "#/$defs/color" },
          {
            "type": "array",
            "minItems": 1,
            "maxItems": 16,
            "items": { "$ref": "#/$defs/color" },
            "description": "Ramp, dark to bright. The renderer lights it."
          }
        ]
      }
    }
  }
}