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const list = ee.List(['Ia', 'Ib', 'II', 'III', 'IV', 'V', 'VI', 'Not Reported', 'Not Applicable', 'Not Assigned',

'World Heritage Site (natural or mixed)', 'Ramsar Site, Wetland of International Importance']);

let featureCollection = ee.FeatureCollection(imageCollectionName).filterBounds(geometry).map(function (feature) {

    var heritageIndex = list.indexOf(feature.get('DESIG_ENG'));

    var mappedFeature = ee.Algorithms.If(heritageIndex.eq(ee.Number(10)), feature.set('IUCN_NUM', ee.Number(10)),

        ee.Algorithms.If(heritageIndex.eq(ee.Number(11)), feature.set('IUCN_NUM', ee.Number(11)), feature.set('IUCN_NUM',

            ee.Number(list.indexOf(feature.get('IUCN_CAT'))))));

    return mappedFeature;

});



const calculateArea = function (feature, first) {

  let area = feature.geometry().intersection(geometry, ee.ErrorMargin(1)).area(ee.ErrorMargin(1)).divide(1000 * 1000);

  return ee.Number(first).add(area);

}

const calculateUnion = function (feature, first) {

  return feature.geometry().intersection(geometry, ee.ErrorMargin(1)).union(first, ee.ErrorMargin(1));

}



let areaList = [];

for (let i = 0; i <= 11; i++) {

  let collection = featureCollection.filter(ee.Filter.eq('IUCN_NUM', i));

  let area = collection.iterate(calculateArea, ee.Number(0));

  areaList.push({

      "value": area.getInfo(),

      "category": i

  });

}

// since protected areas of different types partially overlap, we calculate union of all geometries and then the area of the union which then gives the total protected area. 

const unionGeometry = featureCollection.iterate(calculateUnion, featureCollection.first().geometry().intersection(geometry, ee.ErrorMargin(1)));

const area = ee.Geometry(unionGeometry).area(ee.ErrorMargin(1)).divide(1000 * 1000);



areaList.push({

  "value": area.getInfo(),

  "category": 'totalProtectedArea'

});

areaList.push({

  "value": geometry.area(ee.ErrorMargin(1)).divide(1000 * 1000).getInfo(),

  "category": 'totalArea'

});



const collect = function (feature, first) {

  let dict = ee.Dictionary({

      "ORIG_NAME": feature.get('ORIG_NAME'),

      "DESIG": feature.get('DESIG'),

      "DESIG_ENG": feature.get('DESIG_ENG'),

      "DESIG_TYPE": feature.get('DESIG_TYPE'),

      "IUCN_CAT": feature.get('IUCN_CAT'),

      "GOV_TYPE": feature.get('GOV_TYPE'),

      "MANG_AUTH": feature.get('MANG_AUTH'),

      "MANG_PLAN": feature.get('MANG_PLAN'),

      "OWN_TYPE": feature.get('OWN_TYPE'),

      "STATUS": feature.get('STATUS'),

      "STATUS_YR": feature.get('STATUS_YR'),

      "REP_AREA": feature.get('REP_AREA'),

      "feature": feature

  });

  return ee.List(first).add(dict);

}

const areas = featureCollection.iterate(collect, ee.List([]));

// TODO: result is in  { statistics: areaList, info: areas }