{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "radar-chart-schema",
  "title": "Radar Chart Schema",
  "description": "Intermediate representation for radar (spider) chart diagrams. LLM extracts data from natural language into this format, then rendering pipeline generates HTML/SVG from it.",
  "type": "object",
  "required": ["diagramType", "title", "axes", "series"],
  "additionalProperties": false,
  "properties": {
    "diagramType": {
      "type": "string",
      "const": "radar",
      "description": "Identifies this JSON as a radar chart. Must always be 'radar'."
    },
    "title": {
      "$ref": "schema-shared.json#/$defs/sanitizedString",
      "maxLength": 200,
      "description": "Chart title, displayed at the top of the rendered page.",
      "examples": ["Team Skills Comparison", "Team Skills Comparison (CN)"]
    },
    "subtitle": {
      "$ref": "schema-shared.json#/$defs/sanitizedString",
      "maxLength": 300,
      "description": "Optional subtitle shown below the title.",
      "examples": ["Out of 10", "Score out of 10"]
    },
    "style": {
      "$ref": "schema-shared.json#/$defs/styleEnum",
      "description": "Visual style preset. Each style has its own template and design rules.",
      "default": "dark-professional"
    },
    "format": {
      "$ref": "schema-shared.json#/$defs/formatEnum",
      "description": "Output format. HTML is the default. Radar charts do not support Mermaid output.",
      "default": "html"
    },
    "axes": {
      "type": "array",
      "description": "Dimension axes radiating from the center. Each axis represents one evaluation dimension.",
      "items": {
        "$ref": "#/$defs/axisItem"
      },
      "minItems": 3,
      "maxItems": 12
    },
    "series": {
      "type": "array",
      "description": "Data series. Each series is rendered as a filled polygon overlaid on the grid.",
      "items": {
        "$ref": "#/$defs/seriesItem"
      },
      "minItems": 1,
      "maxItems": 6
    },
    "scaleLevels": {
      "type": "integer",
      "minimum": 2,
      "maximum": 10,
      "default": 5,
      "description": "Number of concentric polygon layers in the grid. Default is 5."
    },
    "legend": {
      "$ref": "schema-shared.json#/$defs/legendConfig",
      "description": "Legend configuration. Auto-generated from series names if not provided."
    },
    "colors": {
      "$ref": "schema-shared.json#/$defs/colorsOverride",
      "description": "Optional color overrides for the style's environment colors (background, text, etc.). Does NOT affect data polygon colors — use series[].color for that."
    },
    "metadata": {
      "$ref": "schema-shared.json#/$defs/metadata",
      "description": "Optional metadata. author field is for internal tracking only and MUST NOT be rendered into the output."
    }
  },
  "$defs": {
    "axisItem": {
      "type": "object",
      "required": ["label"],
      "additionalProperties": false,
      "description": "A single dimension axis with a label and optional max value.",
      "properties": {
        "label": {
          "$ref": "schema-shared.json#/$defs/sanitizedString",
          "maxLength": 30,
          "description": "Axis dimension label displayed outside the perimeter.",
          "examples": ["Frontend", "Backend", "DevOps", "Design", "Testing"]
        },
        "maxValue": {
          "type": "number",
          "exclusiveMinimum": 0,
          "description": "Maximum value for this axis. If specified, must be specified for ALL axes (all-or-nothing). If omitted for all axes, auto-calculated from series data."
        }
      }
    },
    "seriesItem": {
      "type": "object",
      "required": ["name", "data"],
      "additionalProperties": false,
      "description": "A data series rendered as a filled polygon on the radar grid.",
      "properties": {
        "name": {
          "$ref": "schema-shared.json#/$defs/sanitizedString",
          "maxLength": 100,
          "description": "Series name displayed in the legend.",
          "examples": ["Dev A", "Developer 1"]
        },
        "color": {
          "type": "string",
          "pattern": "^#[0-9a-fA-F]{6}$",
          "description": "Optional color override for this series polygon. Must be 6-digit hex (#RRGGBB). If omitted, uses the chart palette."
        },
        "fillOpacity": {
          "type": "number",
          "minimum": 0.0,
          "maximum": 0.5,
          "default": 0.15,
          "description": "Fill opacity of the data polygon. Range 0.0 (transparent) to 0.5 (semi-opaque). Default 0.15."
        },
        "data": {
          "type": "array",
          "description": "Data values for each axis. Length must exactly match axes.length.",
          "items": {
            "type": "number",
            "minimum": 0,
            "description": "Value for this axis. Must be >= 0 and <= axes[i].maxValue."
          },
          "minItems": 3,
          "maxItems": 12
        }
      }
    }
  }
}