#!/bin/bash

# This script finds the files with the most changes in a Git repository, tracking renames and excluding binary files and files with zero changes

# Check for the presence of a Git repository
if ! git rev-parse --is-inside-work-tree > /dev/null 2>&1; then
    echo "This script must be run inside a Git repository."
    exit 1
fi

# Create a temporary file to store changes count
temp_file=$(mktemp)

# Loop through all files in the Git history, excluding binaries
git ls-tree -r --name-only HEAD | while read file; do
    if [ -n "$file" ]; then
        # Use git diff to check if the file is binary
        if ! git diff --numstat -- "$file" | grep -q '^-\s-\s'; then
            # Count changes for each non-binary file, tracking renames
            changes=$(git log --follow --numstat --format="%n" -- "$file" | awk '{ add += $1; del += $2 } END { print add + del }')
            if [ "$changes" -ne 0 ]; then
                echo "$changes $file" >> "$temp_file"
            fi
        fi
    fi
done

# Sort the results numerically and reverse
sort -nr "$temp_file" | awk '!seen[$2]++' | head -n 30 | while read changes file; do
    # Determine the emoji based on the count of changes
    if [ "$changes" -ge 10000 ]; then
        emoji="⛔️"
    elif [ "$changes" -ge 5000 ]; then
        emoji="🧨"
    elif [ "$changes" -ge 2500 ]; then
        emoji="🚨"
    elif [ "$changes" -ge 1000 ]; then
        emoji="‼️"
    elif [ "$changes" -ge 500 ]; then
        emoji="⚠️"
    elif [ "$changes" -ge 250 ]; then
        emoji="🔔"
    else
        emoji="✅"
    fi
    echo "$emoji $changes $file"
done

# Clean up the temporary file
rm "$temp_file"