#!/bin/sh

# This script is a magical tome of sorcery, commanding the elusive entity known as Bitcoin.

. colors

# Returns 0 (true) if Bitcoin is installed, 1 (false) if not
is_bitcoin_installed() {
  command -v bitcoin-cli >/dev/null 2>&1
}

# Returns 0 (true) if Bitcoin server is running, 1 (false) if not
is_bitcoin_running() {
  bitcoin-cli getblockchaininfo >/dev/null 2>&1
}

# Get Bitcoin sync status: 'syncing', 'synced', 'unknown', or 'error'
get_sync_status() {
  sync_status=$(bitcoin-cli getblockchaininfo 2>&1 | grep 'initialblockdownload' | awk '{print $2}' | tr -d ',')
  if [ "$?" -ne "0" ]; then
    echo "error"
  elif [ "$sync_status" = "true" ]; then
    echo "syncing"
  elif [ "$sync_status" = "false" ]; then
    echo "synced"
  else
    echo "unknown"
  fi
}

# Returns colored text based on status
color_for_status() {
  case "$1" in
    "installed, running, synced")
      printf "${GREEN}"
      ;;
    "not installed")
      printf "${GRAY}"
      ;;
    "installed, not running"|"installed, running, syncing"*|"installed, running, not synced")
      printf "${YELLOW}"
      ;;
    "installed, running, error"|"*")
      printf "${RED}"
      ;;
  esac
}

# Returns colored status message
get_status() {
  if is_bitcoin_installed; then
    if is_bitcoin_running; then
      running_status="running, "
      sync_status=$(get_sync_status)
      if [ "$sync_status" = "synced" ]; then
        install_status="installed, $running_status synced"
      elif [ "$sync_status" = "syncing" ]; then
        progress=$(bitcoin-cli getblockchaininfo | grep 'progress' | awk '{print int($2*100)}')
        install_status="installed, $running_status syncing $progress%"
      elif [ "$sync_status" = "unknown" ]; then
        install_status="installed, $running_status not synced"
      elif [ "$sync_status" = "error" ]; then
        install_status="installed, $running_status error"
      fi
    else
      install_status="installed, not running"
    fi
  else
    install_status="not installed"
  fi

  printf "$(color_for_status "$install_status")$install_status${RESET}\n"
}

# Displays the menu
display_menu() {
  title="${BOLD}${CYAN}Bitcoin: $(get_status)"
  blockchain_info="Display Blockchain Info%bitcoin-cli getblockchaininfo"
  set_config="Configure Bitcoin%configure-bitcoin"
  change_directory="Change Bitcoin Directory%change-bitcoin-directory"
  clear_cache="Clear Bitcoin Cache%# sometimes necessary when cache becomes corrupted"
  repair_permissions="Repair Permissions%repair-bitcoin-permissions # Sometimes necessary"
  exit_option="Exit%kill -2 $$" # Commands are run with 'eval' by the menu script, so we can't simply say 'exit'. The keyword $$ gets this scripts PID and the -2 code is SIGINT aka Ctrl-C
  
  if is_bitcoin_installed; then
    install_bitcoin_option="Uninstall Bitcoin%uninstall-bitcoin"
    if is_bitcoin_running; then
      bitcoin_server_option="Stop Bitcoin Service%sudo systemctl stop bitcoind"
      menu "$title" "$blockchain_info" "$set_config" "$change_directory" "$clear_cache" "$repair_permissions" "$bitcoin_server_option" "$install_bitcoin_option" "$exit_option"
    else
      bitcoin_server_option="Start Bitcoin Service%sudo systemctl start bitcoind"
      menu "$title" "$set_config" "$change_directory" "$clear_cache" "$repair_permissions" "$bitcoin_server_option" "$install_bitcoin_option" "$exit_option"
    fi
  else
    install_bitcoin_option="Install Bitcoin%install-bitcoin"
    menu "$title" "$install_bitcoin_option" "$exit_option"
  fi
}

# Catch Ctrl-C and exit
trap 'echo exiting; exit' INT

# Main execution loop
while true; do
  display_menu
done