{
  "openapi": "3.0.3",
  "info": {
    "title": "cron-explain",
    "version": "1.0.0",
    "description": "Stateless cron expression explainer. No account, no stored input, no PII."
  },
  "paths": {
    "/": {
      "get": {
        "summary": "HTML page",
        "responses": {
          "200": {
            "description": "The form and result block",
            "content": {"text/html": {"schema": {"type": "string"}}}
          }
        }
      }
    },
    "/api/explain": {
      "post": {
        "summary": "Explain a cron expression and list its next runs",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": ["expr"],
                "properties": {
                  "expr": {"type": "string"},
                  "tz": {"type": "string", "default": "UTC"},
                  "count": {"type": "integer", "default": 5, "minimum": 1, "maximum": 50}
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "A valid expression",
            "content": {"application/json": {"schema": {"type": "object"}}}
          },
          "400": {
            "description": "invalid_cron, invalid_timezone, invalid_count or invalid_json",
            "content": {"application/json": {"schema": {"type": "object"}}}
          }
        }
      }
    },
    "/api/health": {
      "get": {
        "summary": "Health status",
        "responses": {
          "200": {
            "description": "OK",
            "content": {"application/json": {"schema": {"type": "object"}}}
          }
        }
      }
    },
    "/api/stats": {
      "get": {
        "summary": "Counters from the PII-free traffic log",
        "responses": {
          "200": {
            "description": "total_calls, api_calls_7d, pageviews_7d, unique_visitors_7d",
            "content": {"application/json": {"schema": {"type": "object"}}}
          }
        }
      }
    }
  }
}