#!/usr/bin/env bash
set -euo pipefail
ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
source "$ROOT/lib.sh"

need_cmd brew

#──────────────────────────────────────────────────────────────
# STATE: Preferred login shell (edit this value)
#──────────────────────────────────────────────────────────────
LOGIN_SHELL="bash"  # Options: bash, zsh

#──────────────────────────────────────────────────────────────
# LOGIC: Idempotent shell configuration
#──────────────────────────────────────────────────────────────

# Resolve shell path
case "$LOGIN_SHELL" in
  bash)
    shell_path="$(brew --prefix)/bin/bash"
    ;;
  zsh)
    shell_path="$(brew --prefix)/bin/zsh"
    ;;
  *)
    warn "Unknown shell: $LOGIN_SHELL"
    exit 1
    ;;
esac

log "Ensuring login shell is $shell_path"

# Check if shell is in /etc/shells
if ! grep -qxF "$shell_path" /etc/shells; then
  log "Adding $shell_path to /etc/shells"
  echo "$shell_path" | sudo tee -a /etc/shells >/dev/null
fi

# Change shell if different
if [[ "$SHELL" != "$shell_path" ]]; then
  log "Changing login shell to $shell_path"
  chsh -s "$shell_path"
else
  log "Login shell already set to $shell_path"
fi

log "Login shell configured"