#!/bin/sh

REGION=`aws configure get region`

# Fetch all distinct Lambda layers
aws lambda list-layers --region $REGION | tee lambda_layers.json |
jq -r '.Layers[].LayerArn' | sort -u |

# Loop through each layer ARN and download the latest version
while read -r LAYER_ARN; do
        # Get the latest version ARN
        VERSION_ARN=$(aws lambda list-layer-versions --layer-name $LAYER_ARN --region $REGION --max-items 1 | jq -r '.LayerVersions[0].LayerVersionArn')

        # Get the download URL for the latest version
        S3_URL=$(aws lambda get-layer-version-by-arn --arn $VERSION_ARN --region $REGION | jq -r '.Content.Location')

        # Download and save with a meaningful name
        LAYER_NAME=$(echo $LAYER_ARN | awk -F':' '{print $7}')
        wget -O "$LAYER_NAME.zip" "$S3_URL"
        unzip -d "$LAYER_NAME" "$LAYER_NAME.zip"
done