# Make themes a unique array
typeset -Ua themes

if [[ "${(t)ZSH_THEME_RANDOM_CANDIDATES}" = array && ${#ZSH_THEME_RANDOM_CANDIDATES[@]} -gt 0 ]]; then
  # Use ZSH_THEME_RANDOM_CANDIDATES if properly defined
  themes=($ZSH_THEME_RANDOM_CANDIDATES)
else
  # Look for themes in $ZSH_CUSTOM and $ZSH and add only the theme name (:t)
  themes=(
    "$ZSH_CUSTOM"/*.zsh-theme(N:t:r)
    "$ZSH_CUSTOM"/themes/*.zsh-theme(N:t:r)
    "$ZSH"/themes/*.zsh-theme(N:t:r)
  )
fi

# Choose a theme out of the pool of candidates
N=${#themes[@]}
(( N = (RANDOM%N) + 1 ))
RANDOM_THEME="${themes[$N]}"
unset N themes

# Source theme
if [[ -f "$ZSH_CUSTOM/$RANDOM_THEME.zsh-theme" ]]; then
  source "$ZSH_CUSTOM/$RANDOM_THEME.zsh-theme"
elif [[ -f "$ZSH_CUSTOM/themes/$RANDOM_THEME.zsh-theme" ]]; then
  source "$ZSH_CUSTOM/themes/$RANDOM_THEME.zsh-theme"
elif [[ -f "$ZSH/themes/$RANDOM_THEME.zsh-theme" ]]; then
  source "$ZSH/themes/$RANDOM_THEME.zsh-theme"
else
  echo "[oh-my-zsh] Random theme '${RANDOM_THEME}' not found"
  return 1
fi

echo "[oh-my-zsh] Random theme '${RANDOM_THEME}' loaded"