{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://whynot.design/ir/schema/component.schema.json",
  "title": "whynot IR — Component Contract",
  "description": "Technology-neutral contract for one component in the whynot designbook. Extracted one-way from the canonical React designbook (WHYNOT-WP-0002). Adapters consume this to scaffold stubs and detect drift; they never write back to it.",
  "type": "object",
  "additionalProperties": false,
  "required": ["name", "group", "description", "props"],
  "properties": {
    "name": {
      "type": "string",
      "description": "Canonical component name in PascalCase (e.g. \"Button\"). The Lit adapter maps this to the <wn-button> tag.",
      "pattern": "^[A-Z][A-Za-z0-9]*$"
    },
    "tag": {
      "type": "string",
      "description": "Suggested custom-element tag for web-component adapters (e.g. \"wn-button\"). Advisory; an adapter owns its own naming.",
      "pattern": "^[a-z][a-z0-9-]*$"
    },
    "group": {
      "type": "string",
      "description": "Grouping from the designbook manifest (e.g. \"atoms\", \"chrome\", \"form\"). Mirrors src/elements/<group>.js in the Lit adapter."
    },
    "description": {
      "type": "string",
      "description": "One- or two-sentence purpose, sourced from the React component's .prompt.md docs."
    },
    "props": {
      "type": "array",
      "description": "Public inputs. Each prop carries its React identity AND its projection onto an HTML attribute, so attribute-driven stacks (Lit, Vue, plain HTML) are first-class.",
      "items": { "$ref": "#/$defs/prop" }
    },
    "slots": {
      "type": "array",
      "description": "Named/default content slots.",
      "items": { "$ref": "#/$defs/slot" }
    },
    "events": {
      "type": "array",
      "description": "Events the component emits.",
      "items": { "$ref": "#/$defs/event" }
    },
    "variants": {
      "type": "array",
      "description": "Variant axes — each axis is a named dimension with discrete values (e.g. axis \"variant\" = [primary, secondary]). Usually derived from an enum prop.",
      "items": { "$ref": "#/$defs/variantAxis" }
    },
    "docsRef": {
      "type": "string",
      "description": "Path (relative to repo root) to the source docs in designbook/, e.g. designbook/components/atoms/Button/Button.prompt.md."
    },
    "exemplarRef": {
      "type": "string",
      "description": "Path (relative to repo root) to the reference render under ir/exemplars/, e.g. ir/exemplars/Button.html. Parity (T08) diffs the adapter's render against this."
    }
  },
  "$defs": {
    "prop": {
      "type": "object",
      "additionalProperties": false,
      "required": ["name", "type", "attribute"],
      "properties": {
        "name": {
          "type": "string",
          "description": "React prop name, camelCase (e.g. \"iconEnd\")."
        },
        "type": {
          "type": "string",
          "description": "Neutral type. \"enum\" pairs with `enum`. Non-attribute-portable shapes use \"object\", \"function\", or \"node\" and MUST set portable:false.",
          "enum": ["string", "number", "boolean", "enum", "object", "function", "node"]
        },
        "attribute": {
          "description": "HTML attribute name an attribute-driven adapter binds this prop to (kebab-case), e.g. \"icon-end\". `false` means the prop is intentionally not exposed as an attribute (property-only or non-portable).",
          "oneOf": [
            { "type": "string", "pattern": "^[a-z][a-z0-9-]*$" },
            { "type": "boolean", "const": false }
          ]
        },
        "enum": {
          "type": "array",
          "description": "Allowed values when type is \"enum\".",
          "items": { "type": "string" }
        },
        "default": {
          "description": "Default value as authored in the React source. Type matches `type`."
        },
        "required": {
          "type": "boolean",
          "default": false,
          "description": "Whether the consumer must supply this prop."
        },
        "portable": {
          "type": "boolean",
          "default": true,
          "description": "False marks props that do not map cleanly to an HTML attribute (objects, render props, callbacks). Adapters MUST surface non-portable props as drift, never silently drop them (see open risks)."
        },
        "description": {
          "type": "string"
        }
      },
      "allOf": [
        {
          "if": { "properties": { "type": { "const": "enum" } } },
          "then": { "required": ["enum"] }
        }
      ]
    },
    "slot": {
      "type": "object",
      "additionalProperties": false,
      "required": ["name"],
      "properties": {
        "name": {
          "type": "string",
          "description": "Slot name; use \"default\" for the unnamed default slot."
        },
        "description": { "type": "string" },
        "required": { "type": "boolean", "default": false }
      }
    },
    "event": {
      "type": "object",
      "additionalProperties": false,
      "required": ["name"],
      "properties": {
        "name": {
          "type": "string",
          "description": "Emitted event name as dispatched by the component, e.g. \"wn-dismiss\"."
        },
        "description": { "type": "string" },
        "detail": {
          "type": "string",
          "description": "Free-text description of the event's detail payload shape."
        }
      }
    },
    "variantAxis": {
      "type": "object",
      "additionalProperties": false,
      "required": ["axis", "values"],
      "properties": {
        "axis": {
          "type": "string",
          "description": "Name of the variant dimension, usually the driving prop name (e.g. \"variant\", \"size\")."
        },
        "values": {
          "type": "array",
          "minItems": 1,
          "items": { "type": "string" },
          "description": "Discrete values along this axis."
        },
        "default": {
          "type": "string",
          "description": "Default value for the axis."
        }
      }
    }
  }
}