diff --git a/download_changesets.sh b/download_changesets.sh
index c22ef4b..858a2b8 100644
--- a/download_changesets.sh
+++ b/download_changesets.sh
@@ -1,39 +1,130 @@
 #!/bin/sh
 
-# script to download all changesets of one user since
-# a given date (to get ALL, set date to before their signup)
-# API currently limited to listing max. 100 changesets, 
-# therefore loop required
-
-USER=$1
-SINCE=2013-11-01T00:00:00
-
-# no user servicable parts below. run this in empty directory 
-# and you'll end up with tons of files called c1234.osc (one
-# for each changeset)
-
-T=`date -u +%Y-%m-%dT%H:%M:%S`
-export T
-EX=0
-export EX
-
-while [ $EX = 0 ]
-do
-    wget -Olist "https://api.openstreetmap.org/api/0.6/changesets?display_name=$USER&time=$SINCE,$T" 
-    T=`grep "<changeset" list | tail -1 | cut -d\" -f4`
-    T=`date +"%Y-%m-%dT%H:%M:%SZ" -u -d "$T + 1 second"`
-
-    EX=1
-    cat list | grep "<changeset" | cut -d\" -f2 | while read id
-    do
-        if [ -f c$id.osc ]
-        then
-            :
-        else
-            wget -Oc$id.osc https://api.openstreetmap.org/api/0.6/changeset/$id/download
-            EX=0
+# Usage: ./download_changesets.sh -u USERNAME [-s SINCE_DATE] [-o OUTPUT_DIR] [-l LOG_FILE] [-d]
+
+# Description: This script downloads all changesets of an OpenStreetMap user
+# since a given date. To get all, set SINCE_DATE to before their signup. The
+# API currently lists at most 100 changesets at a time, which is why we loop.
+
+# No user servicable parts below. This will create a directory called:
+# user_SINCE_DATE
+# which will contain tons of files called c1234.osc (one for each changeset)
+
+# Variables
+
+user=
+since=2005-04-09T00:00:00
+end_date=
+output_dir=
+current_time=
+has_more_changesets=1
+logfile=/dev/stdout
+dry_run=false
+
+
+# Parse command-line arguments
+while getopts ":u:s:o:l:d" opt; do
+  case $opt in
+    u) user="$OPTARG";;
+    s) since="$OPTARG";;
+    o) output_dir="$OPTARG";;
+    l) logfile="$OPTARG";;
+    d) dry_run=true;;
+    *) echo "Invalid option: -$OPTARG" >&2; exit 1;;
+  esac
+done
+
+# Check if the username is provided
+if [ -z "$user" ]; then
+    printf "Error: Username is required.\n"
+    exit 1
+fi
+
+# Set the default output directory if not provided
+if [ -z "$output_dir" ]; then
+    output_dir="${user}_${since}"
+fi
+
+# Create output directory if it doesn't exist
+if [ ! -d "$output_dir" ]; then
+    mkdir "$output_dir"
+fi
+
+# Initialize current_time variable
+current_time=$(date -u +%Y-%m-%dT%H:%M:%S)
+
+# Function to download changesets
+download_changesets() {
+    # Create a temporary file
+    temp_file=$(mktemp -t "download-changesets-$user-XXXXXX")
+
+    while [ $has_more_changesets -eq 1 ]; do
+        # Fetch the list of changesets
+        curl -s -o "$temp_file" "https://api.openstreetmap.org/api/0.6/changesets?display_name=$user&time=$since,$current_time"
+
+        # Update the current_time for the next API call
+        current_time=$(grep "<changeset" "$temp_file" | tail -1 | cut -d\" -f4)
+        current_time=$(date +"%Y-%m-%dT%H:%M:%SZ" -u -d "$current_time + 1 second")
+
+        # Break the loop if the end_date is reached
+        if [ -n "$end_date" ] && [ "$(date -d "$current_time" +%s)" -gt "$(date -d "$end_date" +%s)" ]; then
+            break
         fi
+
+        # Set has_more_changesets to 0, assuming no more changesets are available
+        has_more_changesets=0
+
+        # Process each changeset ID
+        grep "<changeset" "$temp_file" | cut -d\" -f2 | while read -r id; do
+            # Check if the changeset file already exists
+            if [ -f "$output_dir/changeset_$id.osc" ]; then
+                :
+            else
+                if [ "$dry_run" = true ]; then
+                    printf "Dry run: Changeset $id would be downloaded.\n" >> "$logfile"
+                else
+                    # Download the changeset with retries and logging
+                    attempt=0
+                    max_attempts=3
+                    while [ $attempt -lt $max_attempts ]; do
+                        printf "Downloading changeset $id (attempt $(($attempt + 1)) of $max_attempts)...\n" >> "$logfile"
+                        if curl -s -o "$output_dir/changeset_$id.osc" "https://api.openstreetmap.org/api/0.6/changeset/$id/download"; then
+                            printf "Changeset $id downloaded successfully.\n" >> "$logfile"
+                            break
+                        else
+                            printf "Failed to download changeset $id. Retrying...\n" >> "$logfile"
+                            sleep $((2 ** $attempt))
+                            attempt=$((attempt + 1))
+                        fi
+                    done
+                    
+                    # Set has_more_changesets to 1, indicating that more changesets are available
+                    has_more_changesets=1
+                fi
+            fi
+        done
     done
-done
 
-rm -f list
+    # Remove the temporary file
+    rm -f "$temp_file"
+}
+
+# Call the download_changesets function
+download_changesets
+
+# Print summary report
+total_changesets=$(find "$output_dir" -name "changeset_*.osc" | wc -l)
+total_size=$(du -sh "$output_dir" | cut -f1)
+printf "Summary:\nTotal Changesets: %s\nTotal Size: %s\n" "$total_changesets" "$total_size" >> "$logfile"
+
+# Display help message
+if [ $# -eq 0 ]; then
+    printf "Usage: ./script.sh -u USERNAME [-s SINCE_DATE] [-e END_DATE] [-o OUTPUT_DIR] [-l LOG_FILE] [-d]\n"
+    printf "Options:\n"
+    printf "  -u    Specify the OpenStreetMap username.\n"
+    printf "  -s    Specify the start date for downloading changesets (default: 2013-11-01T00:00:00).\n"
+    printf "  -o    Specify the output directory (default: USERNAME_SINCE_DATE).\n"
+    printf "  -l    Specify the log file location (default: stdout).\n"
+    printf "  -d    Enable dry-run mode, which lists changesets without downloading them.\n"
+    exit 1
+fi