#!/bin/bash
# ================================================
# SHELL->PRELANG->INIT ===========================
# ================================================

# ------------------------------------------------
# UTILITY ----------------------------------------
# ------------------------------------------------
_fatal_error() {
  echo "fatal: $@"
  exit 1
}

_command_exists() {
  (command -v $1 >/dev/null 2>&1)
}

_require_command() {
  if ( ! `_command_exists $1` ) ; then
    _fatal_error "Prelang init script requires '$1' but it is not installed."
  fi
}

_topic() {
  echo "-----> $@"
}

_execute_sucessfully_or_exit() {
  # Raw execution of the command
  $@

  # Check exit status
  if [[ $? != 0 ]] ; then
    _fatal_error "Command '$@' failed."
  fi
}

_git_commit_all_with_message() {
  git add .
  git commit --all --message="$1" --author="Prelang Builder <builder@prelang.com>"
}

_git_push() {
  # FIX: Make sure the user is on master
  git push origin master
}

_prompt() {
  echo -e -n "\033[1;32m"
  echo -n $1" (y/n): "
  echo -e -n '\033[0m'
  read answer

  if [[ $answer == "y" ]] ; then
    return 0
  fi
  return 1
}

_sleep_and_open_rails_url() {
  _rails_url="http://localhost:3000"

  # FIX: Make a better way to check if the Rails server is running.
  sleep 7

  if [[ `uname` == "Darwin" ]] ; then
    open $_rails_url
  elif [[ `uname` == "Linux" ]] ; then
    if ( `_command_exists xdg-open` ) ; then
      xdg-open $_rails_url
    fi
  fi
}

_source_rvm_if_exists() {
  # In case RVM already is sourced don't source it.
  # FIX: Not sure this can happen since we're launching from a shebang script.
  if ( ! `_command_exists $1` ) ; then
    return 0
  fi

  # Source RVM if it exists
  if [[ -f $HOME/.rvm/scripts/rvm ]] ; then
    source $HOME/.rvm/scripts/rvm
  fi
}

# ------------------------------------------------
# MAIN -------------------------------------------
# ------------------------------------------------
_source_rvm_if_exists

_require_command "git"

# FIX: Check for non-Prelang Builder commits

# Run "bundle install"
# --------------------
_require_command "bundle"
_topic "Running 'bundle install' to fetch and install required Ruby Gems"
_execute_sucessfully_or_exit bundle install

# FIX: Do we need this commit?
_git_commit_all_with_message "Executed 'bundle install' to fetch and install required Ruby Gems"

# Require "rake" for next few commands
_require_command "rake"

# Run "rake db:create"
# --------------------
_topic "Running 'rake db:create' to create a development database"
_execute_sucessfully_or_exit rake db:create

# Run "rake db:migrate"
# --------------------
_topic "Running 'rake db:migrate' to migrate to the proper database schema"
_execute_sucessfully_or_exit rake db:migrate

# Track schema.rb
_git_commit_all_with_message "Executed 'rake db:migrate' to migrate all generated migrations which created schema.rb"

# Clean up
# --------
#_prompt "Would you like to keep this script (./prelang-init) in your repository? This will allow you to run it later if you need to reinitialize your Rails project."

#if [[ $? != 0 ]] ; then
  #_topic "Removing 'prelang-init' script"

  #if ( ! test -f ./prelang-init ) ; then
    #_fatal_error "'./prelang-init' does not exist."
  #fi
    
  #_execute_sucessfully_or_exit git rm ./prelang-init
  #_git_commit_all_with_message "Removed 'prelang-init' script after successful execution"
#fi

# Push
# ----
_topic "Pushing git repository changes back to origin"
_git_push

# Rails Server
# ------------
_prompt "Would you like to start the Rails server and open your running Rails application in a browser?"

if [[ $? == 0 ]] ; then
  _sleep_and_open_rails_url &

  # FIX: Will this be using the correct Rails? RVM?
  rails server
fi