#!/usr/bin/env bash
# Generate version lockfile for reproducible installations

set -euo pipefail

DOTFILES_DIR="$HOME/dotfiles"
LOCKFILE="$DOTFILES_DIR/Brewfile.lock"
TEMP_LOCK="/tmp/Brewfile.lock.new"

# Colors
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'

echo -e "${BLUE}Generating version lockfile...${NC}"

# Create new lockfile
cat > "$TEMP_LOCK" << EOF
# Brewfile Lock - Version snapshot for reproducibility
# Generated: $(date)
# System: $(sw_vers -productVersion)

EOF

# Get versions of installed packages
echo -e "${YELLOW}Capturing package versions...${NC}"

echo "# Critical formulae" >> "$TEMP_LOCK"
brew list --versions --formula | sort >> "$TEMP_LOCK"

echo "" >> "$TEMP_LOCK"
echo "# Casks" >> "$TEMP_LOCK"
brew list --versions --cask | sort >> "$TEMP_LOCK"

# Show differences if lockfile exists
if [[ -f "$LOCKFILE" ]]; then
    echo -e "${YELLOW}Changes since last lock:${NC}"
    if ! diff "$LOCKFILE" "$TEMP_LOCK" > /dev/null; then
        diff "$LOCKFILE" "$TEMP_LOCK" || true
    else
        echo "No changes detected"
    fi
fi

# Replace lockfile
mv "$TEMP_LOCK" "$LOCKFILE"

echo -e "${GREEN}✅ Lockfile updated: $LOCKFILE${NC}"
echo -e "${YELLOW}💡 Commit this file to track version changes${NC}"