#!/usr/bin/env bash

set -Eeuo pipefail

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" 2>/dev/null && pwd -P || true)"
if [[ -n "$SCRIPT_DIR" && -e "$SCRIPT_DIR/.git" ]]; then
  APP_PATH="${APP_PATH:-$SCRIPT_DIR}"
else
  APP_PATH="${APP_PATH:-$HOME/.dotfiles}"
fi
readonly APP_PATH
readonly MANAGED_START='# >>> dotfiles >>>'
readonly MANAGED_END='# <<< dotfiles <<<'

remove_managed_link() {
  local target=$1 expected=$2
  if [[ -L "$target" && "$(readlink "$target")" == "$expected" ]]; then
    rm -- "$target"
    printf 'Removed %s\n' "$target"
  fi
}

remove_managed_block() {
  local file=$1 temp
  [[ -f "$file" ]] || return
  temp=$(mktemp)
  awk -v start="$MANAGED_START" -v end="$MANAGED_END" '
    $0 == start { managed = 1; next }
    $0 == end { managed = 0; next }
    !managed { print }
  ' "$file" > "$temp"
  cat "$temp" > "$file"
  rm -f "$temp"
}

remove_managed_link "$HOME/.vimrc" "$APP_PATH/.vimrc"
remove_managed_link "$HOME/.tmux.conf" "$APP_PATH/.tmux.conf"
remove_managed_block "$HOME/.bashrc"

printf '%s\n' 'Dotfile links and the managed Bash block were removed.'
printf '%s\n' 'The repository, Vim data/plugins, TPM, and backups were retained.'