#!/usr/bin/env sh
# shellcheck disable=SC2016
if [ ! -f "git-pad" ] || { [ ! -f "autocompletion.bash" ] && [ ! -f "autocompletion.zsh" ] && [ ! -f "autocompletion.fish" ]; } ; then
  echo '!E: Not in git-pad directory';
  exit 1
fi

if [ $# -eq 0 ]; then
    # On Windows/Git Bash, $SHELL may be unset or a Windows path
    # so detect the shell via version variables instead
    if [ -n "${ZSH_VERSION:-}" ]; then
        exec /usr/bin/env sh $0 zsh;
    elif [ -n "${BASH_VERSION:-}" ]; then
        exec /usr/bin/env sh $0 bash;
    else
        exec /usr/bin/env sh $0 "$(basename "${SHELL:-unknown}")";
    fi
else
    shell_name=$1
fi

# On Windows, $HOME may be unset
if [ -z "${HOME:-}" ]; then
    HOME="$(cd ~ && pwd)"
fi

# Start the validation and installation
id="## git-pad"

case "$shell_name" in
  bash | zsh)
        rc="$HOME/.${shell_name}rc"

        block='
'"$id"'
PATH=$PATH:'"$PWD"'
export PATH
. '"$PWD"'/autocompletion.'"$shell_name"
        ;;

  fish)
        ln -s "$PWD/autocompletion.fish" "$HOME/.config/fish/completions/git-pad.fish"
        rc="$HOME/.config/fish/config.fish"

        block='
'"$id"'
fish_add_path '"$PWD"
        ;;

  *) echo "Unsupported shell: $shell_name"; exit 1 ;;
esac

if grep -q "$id" "$rc" 2>/dev/null; then
  echo '!W: Looks like it is already installed'
  echo '--------------------------------------'
  grep -C 5 "$id" "$rc"
else
  echo "$block" >> "$rc" && echo "Installed successfully. Restart your shell."
fi