#!/usr/bin/env ruby
require File.dirname(__FILE__) + '/../config/boot'
require 'rubygems'
require 'activesupport'
require 'pathname'
require 'digest/md5'

project_name = ARGV[0]
fail("Usage:  #{File.basename(__FILE__)} new_project_name")     unless project_name
fail("Project name must only contain [a-z0-9_]")                unless project_name =~ /^[a-z0-9_]+$/

base_directory = Pathname.new(File.join(File.dirname(__FILE__), '..', '..')).realpath
project_directory = base_directory + project_name
fail("Project directory (#{project_directory}) already exists") if project_directory.exist?

template_url  = "git://github.com/dancroak/heroku_suspenders.git"
changeme      = "rebirth"
changesession = "CHANGESESSION"
changetitle   = "Rebirth"

def run(cmd)
  puts "Running '#{cmd}'"
  out = `#{cmd}`
  if $? != 0 
    fail "Command #{cmd} failed: #$?\n#{out}" 
  end
  out
end

def search_and_replace(file, search, replace)
  if File.file?(file)
    contents = File.read(file)
    if contents[search]
      puts "Replacing #{search} with #{replace} in #{file}"
      contents.gsub!(search, replace)
      File.open(file, "w") { |f| f << contents }
    end
  end
end

def not_installed?(gem_name)
  gems = Gem.source_index.find_name(gem_name)
  gems.detect { |gem| gem.name == gem_name }.nil?
end

def installed?(gem_name)
  installed_gems = Gem.source_index.find_name(gem_name)
  installed_gems.any?
end

run("cp -r . #{project_directory}")
Dir.chdir(project_directory) or fail("Couldn't change to #{project_directory}")
run("git init")
run("git remote add heroku_suspenders #{template_url}")

Dir.glob("#{project_directory}/**/*").each do |file|
  search_and_replace(file, changeme,    project_name)
  search_and_replace(file, changetitle, project_name.titleize)
end

Dir.glob("#{project_directory}/**/session_store.rb").each do |file|
  datestring = Time.now.strftime("%j %U %w %A %B %d %Y %I %M %S %p %Z")
  search_and_replace(file, changesession, Digest::MD5.hexdigest("#{project_name} #{datestring}"))
end

run("git mv public/stylesheets/screen.css public/stylesheets/#{project_name}.css")
run("sudo chmod 0666 public/stylesheets/#{project_name}.css")

run("git add .")
run("git commit -m 'New Heroku Suspenders app'")

unless installed?("rails")
  run "sudo gem install rails"
end

# can't vendor nokogiri because it has native extensions
unless installed?("nokogiri")
  run "sudo gem install nokogiri --version='1.3.3'"
end

# need to install heroku gem for the 'heroku' commands
unless installed?("heroku")
  run "sudo gem install heroku"
end

unless installed?("sqlite3-ruby")
  run "sudo gem install sqlite3-ruby"
end

# can't install rubaidh-google_analytics via rake gems:install because
# it is a production gem and we don't have a production database
unless installed?("rubaidh-google_analytics")
  run "sudo gem install rubaidh-google_analytics --version='1.1.4'"
end

run("sudo touch log/development.log")
run("sudo chmod 0666 log/development.log")
run("sudo touch log/test.log")
run("sudo chmod 0666 log/test.log")
run("sudo touch log/cucumber.log")
run("sudo chmod 0666 log/cucumber.log")

run("rake db:migrate RAILS_ENV=development")
run("rake db:migrate RAILS_ENV=test")
run("rake db:migrate RAILS_ENV=cucumber")

puts
puts "Next: run the tests, configure Heroku, deploy!"
puts
puts "cd ../#{project_name} && rake && rake heroku:setup"