var geometry = 
    /* color: #ffc82d */
    /* shown: false */
    ee.Geometry.Polygon(
        [[[36.803785364345735, 37.6022824651851],
          [36.84292415829105, 37.569634979372736],
          [36.8896160528223, 37.548134235962486],
          [36.96171383114261, 37.54377889953015],
          [36.99741939754886, 37.565280899470345],
          [36.97819332333011, 37.58759286852694],
          [36.92600826473636, 37.59820231254613],
          [36.886182825283235, 37.60473044936202],
          [36.84910396786136, 37.60527443490601],
          [36.81889156551761, 37.605818416471855],
          [36.809278528408235, 37.60527443490601]]]);
var area = ee.FeatureCollection(geometry);

Map.centerObject(geometry)
// print image dates from 
var sentinel_id = "COPERNICUS/S2_SR_HARMONIZED"

var pre_quake_start = "2023-01-15"
var pre_quake_end = "2023-01-25"

var post_quake_start = "2023-02-07"
var post_quake_end = "2023-02-12"

var imagery = ee.ImageCollection(sentinel_id)
  
  // .filterDate(pre_quake_end, post_quake_start)
  // .filterBounds(geometry)


var pre_quake = ee.ImageCollection(
  imagery.filterDate(pre_quake_start, pre_quake_end).filterBounds(area)
)
var post_quake = ee.ImageCollection(
  imagery.filterDate(post_quake_start, post_quake_end).filterBounds(area)
)

print(pre_quake.first().date())
print(post_quake.first().date())

Map.centerObject(area);

function maskS2sr(image) {
  // Bits 10 and 11 are clouds and cirrus, respectively.
  var cloudBitMask = ee.Number(2).pow(10).int();
  var cirrusBitMask = ee.Number(2).pow(11).int();
  // Get the pixel QA band.
  var qa = image.select('QA60');
  // All flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
      .and(qa.bitwiseAnd(cirrusBitMask).eq(0));
  // Return the masked image, scaled to TOA reflectance, without the QA bands.
  return image.updateMask(mask)
      .copyProperties(image, ["system:time_start"]);
}


var pre_quake_CM = pre_quake.map(maskS2sr);
var post_quake_CM = post_quake.map(maskS2sr);

var pre_mos = pre_quake.mosaic().clip(area);
var post_mos = post_quake.mosaic().clip(area);

var vis = {bands: ['B4', 'B3', 'B2'], max: 2000, gamma: 1.5};

Map.addLayer(pre_mos, vis,'Pre-quake image');
Map.addLayer(post_mos, vis,'Post-quake image');

print(pre_mos)
print(post_mos)

Export.image.toDrive({
  image: pre_mos.visualize(vis),
  description: 'export_premos',
  folder: 'earthengine',
  scale: 10, 
  maxPixels:1e10,
  region: geometry,
});

Export.image.toDrive({
  image: post_mos.visualize(vis),
  description: 'export_postmos',
  folder: 'earthengine',
  scale: 10, 
  maxPixels:1e10,
  region: geometry,
});