#!/usr/bin/env bash
#
# Main entry script for dotbare, used to route command to appropriate scripts
#
# @params
# Globals
#   ${mydir}: string, directory of the executing script, used for sourcing helpers
# Arguments
#   action_command: sub commands dotbare should run
#     General git command: log, status etc
#     dotbare specific commands: fadd | frm | fpop | freset | fcheckout | help etc
#   option flags:
#     check sub commands for available option flags

mydir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source "${mydir}"/helper/set_variable.sh

function usage() {
  echo -e "Usage: dotbare [-h] [-v] [COMMANDS] [OPTIONS] ...

Interactively manage dotfiles with the help of fzf and git bare repository.
To see all dotbare specific COMMANDS, run dotbare without any arguments.

Optional arguments:
  -h, --help\t\tshow this help message and exit.
  -v, --version\t\tshow dotbare current version.
  -g, --git\t\tuse dotbare as a generic fuzzy git tool and operate in current git directory.

Available commands:
  All git commands are available, treat dotbare as git.
  fadd      \t\tstage files/directories interactively.
  fbackup   \t\tperform backup for tracked files.
  fcheckout \t\tcheckout branch/files/commit interactively.
  fedit     \t\tinteractively select files/commit and edit.
  fgrep     \t\tgrep within tracked files.
  finit     \t\tinitialise dotbare or migrate dotfiles to a new machine.
  flog      \t\tmanage commits interactively.
  freset    \t\treset(unstage) files or commit interactively.
  fstash    \t\tmanage stash interactively.
  fstat     \t\tinteractive menu to toggle stage/unstage.
  funtrack  \t\tuntrack files interactively.
  fupgrade  \t\tupdate dotbare to the latest master."
}

function list_dotbare_commands() {
  find "${mydir}"/scripts/* -type f -print0 \
    | xargs -I __ -0 basename __ \
    | fzf --no-multi --header='Available commands' --preview="${mydir}/dotbare {} -h" \
    | xargs -I __ "${mydir}"/dotbare __ -h
}

function execute_dotbare() {
  [[ "$#" -eq 0 ]] \
    && list_dotbare_commands \
    && exit 0

  if [[ -x "${mydir}/scripts/$1" ]]; then
    exec "${mydir}/scripts/$1" "${@:2}"
  fi
}

# if no argument, display all possible actions
if [[ "$#" -eq 0 ]]; then
  list_dotbare_commands
  exit 0
fi

[[ "$*" == 'add --all' ]] && \
  echo 'If you intend to stage all modified file, run dotbare add -u' && \
  echo "dotbare disabled add --all option as this will stage every single file in ${DOTBARE_TREE}" && \
  exit 1

case "$1" in
  --help|-h)
    usage
    exit 0
    ;;
  -v|--version)
    echo "Current dotbare version: ${DOTBARE_VERSION}"
    exit 0
    ;;
  -g|--git)
    if git rev-parse --is-inside-work-tree &>/dev/null; then
      DOTBARE_TREE=$(git rev-parse --show-toplevel)
      DOTBARE_DIR="${DOTBARE_TREE}/.git"
      shift
      case "$1" in
        fbackup|finit|fupgrade)
          echo "dotbare $1 is not supported when using dotbare as a generic fuzzy git tool" >&2
          exit 1
          ;;
        *)
          execute_dotbare "$@"
          ;;
      esac
    else
      echo "Not in a git directory" >&2
      exit 1
    fi
    ;;
  *)
    execute_dotbare "$@"
    ;;
esac

git --git-dir="${DOTBARE_DIR}" --work-tree="${DOTBARE_TREE}" "$@"