#!/usr/bin/env bash

set -e

REPO_BASE="git@github.com:itme-brain"

is_windows() {
  [[ "$OS" == "Windows_NT" ]] || [[ "$(uname -s)" =~ MINGW|MSYS|CYGWIN ]]
}

if is_windows; then
  APPDATA_LOCAL="$(cmd.exe /C "echo %LOCALAPPDATA%" 2>/dev/null | tr -d '\r')"
  GIT_TARGET="$HOME/.config/git"
  VIM_TARGET="$HOME/vimfiles"
  NVIM_TARGET="$APPDATA_LOCAL/nvim"
  BASH_TARGET="$HOME/.config/bash"
else
  GIT_TARGET="$HOME/.config/git"
  VIM_TARGET="$HOME/.vim"
  NVIM_TARGET="$HOME/.config/nvim"
  BASH_TARGET="$HOME/.config/bash"
fi

names=("bash" "git" "vim" "nvim")
targets=("$BASH_TARGET" "$GIT_TARGET" "$VIM_TARGET" "$NVIM_TARGET")

repos=()
for name in "${names[@]}"; do
  repos+=("$REPO_BASE/$name.git")
done
selected=()

for i in "${!names[@]}"; do
  selected+=("false")
done

install_config() {
  local repo="$1"
  local dest="$2"

  if [ -e "$dest" ]; then
    echo "  Backing up existing: $dest -> ${dest}.bak"
    mv "$dest" "${dest}.bak"
  fi

  mkdir -p "$(dirname "$dest")"
  if ! git clone -q "$repo" "$dest" 2>&1; then
    echo "  Failed to clone $repo"
    return 1
  fi
}

draw_menu() {
  local cursor="$1"

  if [ "$2" = "redraw" ]; then
    for _ in "${names[@]}"; do
      printf "\033[A"
    done
    printf "\033[A"
  fi

  echo "  (↑/↓ navigate, space toggle, enter confirm)"
  for i in "${!names[@]}"; do
    local marker=" "
    if [ "${selected[$i]}" = "true" ]; then
      marker="x"
    fi

    if [ "$i" -eq "$cursor" ]; then
      printf "  \033[1m> [%s] %s\033[0m  ->  %s\n" "$marker" "${names[$i]}" "${targets[$i]}"
    else
      printf "    [%s] %s  ->  %s\n" "$marker" "${names[$i]}" "${targets[$i]}"
    fi
  done
}

echo "Select configs to install:"

cursor=0
draw_menu $cursor "first"

while true; do
  IFS= read -rsn1 key

  if [ "$key" = $'\x1b' ]; then
    read -rsn2 rest
    key="${key}${rest}"
  fi

  case "$key" in
    $'\x1b[A' | k)
      if [ $cursor -gt 0 ]; then
        cursor=$((cursor - 1))
      fi
      ;;
    $'\x1b[B' | j)
      if [ $cursor -lt $((${#names[@]} - 1)) ]; then
        cursor=$((cursor + 1))
      fi
      ;;
    " ")
      if [ "${selected[$cursor]}" = "true" ]; then
        selected[$cursor]="false"
      else
        selected[$cursor]="true"
      fi
      ;;
    "")
      break
      ;;
  esac

  draw_menu $cursor "redraw"
done

echo ""

any_selected=false
for i in "${!names[@]}"; do
  if [ "${selected[$i]}" = "true" ]; then
    any_selected=true
    echo "Installing ${names[$i]}..."
    install_config "${repos[$i]}" "${targets[$i]}"

    # Bash needs ~/.bashrc to source it
    if [ "${names[$i]}" = "bash" ]; then
      BASHRC="$HOME/.bashrc"
      SOURCE_LINE="source ~/.config/bash/bashrc"
      if [ -f "$BASHRC" ] && grep -qF "$SOURCE_LINE" "$BASHRC"; then
        echo "  ~/.bashrc already sources config"
      else
        echo "$SOURCE_LINE" >> "$BASHRC"
        echo "  Added source line to ~/.bashrc"
      fi
    fi

    echo ""
  fi
done

if [ "$any_selected" = "false" ]; then
  echo "Nothing selected."
fi

echo "Done."