{
  "schemaVersion": 1,
  "slug": "cat-age-calculator",
  "category": "health",
  "kind": "implementation",
  "independentValidation": false,
  "implementationHash": "c5318fdf0b5880d6f95653749a7758a6d67d98cf2bdbba46622b6277c9ba51d6",
  "provenance": "Generated from the calculation contract used by the published page. Publication is not external validation.",
  "sourceFiles": [
    "data/calculators/cat-age-calculator.json",
    "src/engine.js"
  ],
  "runtimeSource": "/sources/engine.txt",
  "runtimeHash": "5c888d8898afbdee36267bb9977829e1e2ac568f6677c8ee87469c139864645c",
  "scope": "The compute function records implemented equations, constants, lookup tables and custom rules. Inputs record defaults and allowed values; outputs record precision and units. Defaults are examples, not recommendations. General background references are not evidence for this specific algorithm.",
  "publishedFormula": {
    "formula": "H = 15a (a ≤ 1);  H = 15 + 9(a − 1) (1 < a ≤ 2);  H = 24 + 4(a − 2) (a > 2)",
    "vars": [
      [
        "H",
        "Equivalent human years"
      ],
      [
        "a",
        "Cat age in years"
      ]
    ],
    "note": "a includes cat months divided by 12; year 1 = 15, year 2 adds 9, later years add 4."
  },
  "externalEvidence": null,
  "contract": {
    "compute": "const mergedResult=(()=>{if((true&&![\"age\", \"birthdate\"].includes(String(ageInput))))return{__error:'inputError'};\nif(([\"age\"].includes(String(ageInput))&&(!Number.isFinite(catYears)||catYears<0||catYears>30))||([\"age\"].includes(String(ageInput))&&(!Number.isFinite(catMonths)||catMonths<0||catMonths>11)))return{__error:'inputError'};\nconst parse=s=>{const d=new Date(s+'T00:00:00Z');return /^\\d{4}-\\d{2}-\\d{2}$/.test(s)&&Number.isFinite(d.getTime())&&d.toISOString().slice(0,10)===s?d:null;};let age;if(ageInput==='birthdate'){const b=parse(birthDate),t=parse(today);if(!b||!t||b>t)return{__error:'inputError'};age=(t-b)/86400000/365.2425;}else if(ageInput==='age'){if(!Number.isFinite(catYears)||catYears<0||catYears>30||!Number.isInteger(catMonths)||catMonths<0||catMonths>11)return{__error:'inputError'};age=catYears+catMonths/12;}else return{__error:'inputError'};const humanYears=age<=.5?age*20:age<=1?10+(age-.5)*10:age<=2?15+(age-1)*9:24+(age-2)*4;const lifeStage=age<1?'Kitten':age<7?'Young adult cat':age<=10?'Mature adult cat':'Senior cat';return{humanYears,catAgeYears:age,lifeStage};\n})();return mergedResult.__error?{\"humanYears\":null,\"lifeStage\":null,\"catAgeYears\":null,...mergedResult}:mergedResult;",
    "inputs": [
      {
        "name": "ageInput",
        "type": "select",
        "default": "age",
        "options": [
          {
            "value": "age"
          },
          {
            "value": "birthdate"
          }
        ]
      },
      {
        "name": "catYears",
        "type": "number",
        "default": 5,
        "min": 0,
        "max": 30,
        "step": 0.01,
        "slider": true,
        "showWhen": {
          "ageInput": [
            "age"
          ]
        },
        "requiredValue": true,
        "strictRange": true
      },
      {
        "name": "catMonths",
        "type": "number",
        "default": 0,
        "min": 0,
        "max": 11,
        "step": 1,
        "slider": true,
        "showWhen": {
          "ageInput": [
            "age"
          ]
        },
        "requiredValue": true,
        "strictRange": true
      },
      {
        "name": "birthDate",
        "type": "date",
        "default": "2018-05-01",
        "step": 1,
        "showWhen": {
          "ageInput": [
            "birthdate"
          ]
        },
        "requiredValue": true,
        "preserveEmpty": true
      },
      {
        "name": "today",
        "type": "date",
        "default": "@today",
        "step": 1,
        "showWhen": {
          "ageInput": [
            "birthdate"
          ]
        },
        "requiredValue": true,
        "preserveEmpty": true
      }
    ],
    "outputs": [
      {
        "name": "humanYears",
        "precision": 1,
        "unit": "years"
      },
      {
        "name": "lifeStage",
        "precision": 0,
        "unit": "",
        "type": "text"
      },
      {
        "name": "catAgeYears",
        "precision": 2,
        "unit": "years"
      }
    ],
    "interpret": null
  }
}