#!/bin/bash

#/ NAME
#/     proxy -- proxies deploy using a gateway host
#/
#/ SYNOPSIS
#/     
#/     proxy gateway version deploy_command args 
#/     proxy git_url git_spec gateway version deploy_command args 
#/

# figure out the project root under which bin, lib live
shome="$(cd -P -- "$(dirname -- "$BASH_SOURCE")/.." && pwd -P)"

# load a jason bourne library
source "$shome/libexec/_treadstone"
get_started

function git_branch_head {
  local ver_repo="$1"; shift

  local git_branch=""
  local git_head="$ver_repo"
  if [[ "$ver_repo" = "HEAD" ]]; then
    git_branch="$(git symbolic-ref HEAD 2>&- | sed 's#^refs/heads/##' || true)"

    git_head="$(git rev-parse HEAD)"
    if [[ -z $git_head ]]; then
      echo "ERROR: could not find the SHA for HEAD" 1>&2
      return 1
    fi
  fi

  echo "$git_branch:$git_head"
}

function clone_proxy {
  local ver_repo=$2
  export _AO_PROXIED=1
  rm -rf $shome/.tmp/deploy
  local git_url="$(git config --list | grep remote.origin.url | cut -d= -f2-)"
  git clone -q $shome $shome/.tmp/deploy
  cd $shome/.tmp/deploy
  local git_spec="$(git_branch_head "$ver_repo")"
  git checkout -q "${git_head##*:}"
  exec $shome/.tmp/deploy/sbin/proxy "$git_url" "$git_spec" "$@"
}

: ${_AO_PROXIED:=}
if [[ -z "$_AO_PROXIED" ]]; then
  clone_proxy "$@"
fi

# entry point
function main {
  local git_url="$1"; shift
  local git_spec="$1"; shift
  local hst_gateway="$1"; shift
  local ver_repo="$1"; shift
  case "$hst_gateway" in 
    *)
      local pth_rvmrun="${_AO_RUBY_LOADER:-}"
      : ${pth_rvmrun:=$(ruby -ryaml -e 'puts YAML.load(File.read(ARGV[0]))[ARGV[1]]' $_AO_HOME/config/deploy.yml ruby_loader)}
      local nm_ruby="$(ruby -ryaml -e 'puts YAML.load(File.read(ARGV[0]))[ARGV[1]]' $_AO_HOME/config/deploy.yml app_ruby)"

      local tmp_remote="$(ssh $hst_gateway mktemp -t XXXXXXXXX)"
      scp -q $shome/sbin/remote-helper $hst_gateway:$tmp_remote
      ssh -t $hst_gateway "$pth_rvmrun" "$nm_ruby" bash "$tmp_remote" "$USER" "$git_url" "$git_spec" "$@"
      ssh $hst_gateway rm -f $tmp_remote
      ;;
  esac
}

require sub "$BASH_SOURCE" "$@"