#!/usr/bin/env bash
set -euo pipefail

usage() {
  cat <<'EOF'
Usage:
  ./scripts/init.sh <new-module-path>

Example:
  ./scripts/init.sh github.com/yourname/yourrepo

What it does:
  - updates go.mod module path
  - replaces old module imports across text files
  - runs go mod tidy
EOF
}

if [[ $# -ne 1 ]]; then
  usage
  exit 1
fi

new_module="$1"
script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
repo_root="$(cd "$script_dir/.." && pwd)"
cd "$repo_root"

if [[ ! -f go.mod ]]; then
  echo "go.mod not found in repository root"
  exit 1
fi

old_module="$(awk 'NR==1 && $1 == "module" { print $2 }' go.mod)"
if [[ -z "$old_module" ]]; then
  echo "failed to detect current module path from go.mod"
  exit 1
fi

if [[ "$new_module" == "$old_module" ]]; then
  echo "module path is already set to: $new_module"
  exit 0
fi

echo "Updating module path:"
echo "  old: $old_module"
echo "  new: $new_module"

while IFS= read -r file; do
  [[ -n "$file" ]] || continue
  perl -0pi -e "s@\Q${old_module}/\E@${new_module}/@g" "$file"
done < <(rg -l --hidden --glob '!**/.git/**' --glob '!**/.idea/**' "${old_module}/" . || true)

go mod edit -module "$new_module"
go mod tidy

atlas_tool_dir="$repo_root/tools/atlas-loader"
if [[ -f "$atlas_tool_dir/go.mod" ]]; then
  (
    cd "$atlas_tool_dir"
    go mod edit -droprequire "$old_module"
    go mod edit -require "$new_module@v0.0.0"
    go mod edit -dropreplace "$old_module"
    go mod edit -replace "$new_module=../.."
    go mod tidy
  )
fi

echo "Initialization complete."