#!/usr/bin/env ruby

MERB_ENV = RAILS_ENV  = 'testing'
RAILS_ROOT = '.'

require File.dirname(__FILE__) + '/../test_helper'
require 'sass/plugin'
require 'fileutils'

class SassPluginTest < Test::Unit::TestCase
  @@templates = %w{
    complex constants parent_ref import alt
    subdir/subdir subdir/nested_subdir/nested_subdir
  }

  def setup
    FileUtils.mkdir tempfile_loc
    FileUtils.mkdir tempfile_loc(nil,"more_")
    set_plugin_opts
    Sass::Plugin.update_stylesheets
  end

  def teardown
    FileUtils.rm_r tempfile_loc
    FileUtils.rm_r tempfile_loc(nil,"more_")
  end

  def test_templates_should_render_correctly
    @@templates.each { |name| assert_renders_correctly(name) }
  end

  def test_no_update
    File.delete(tempfile_loc('basic'))
    assert Sass::Plugin.stylesheet_needs_update?('basic', template_loc, tempfile_loc)
    Sass::Plugin.update_stylesheets
    assert !Sass::Plugin.stylesheet_needs_update?('basic', template_loc, tempfile_loc)
  end

  def test_update_needed_when_modified
    sleep(1)
    FileUtils.touch(template_loc('basic'))
    assert Sass::Plugin.stylesheet_needs_update?('basic', template_loc, tempfile_loc)
    Sass::Plugin.update_stylesheets
    assert !Sass::Plugin.stylesheet_needs_update?('basic', template_loc, tempfile_loc)
  end

  def test_update_needed_when_dependency_modified
    sleep(1)
    FileUtils.touch(template_loc('basic'))
    assert Sass::Plugin.stylesheet_needs_update?('import', template_loc, tempfile_loc)
    Sass::Plugin.update_stylesheets
    assert !Sass::Plugin.stylesheet_needs_update?('import', template_loc, tempfile_loc)
  end

  def test_full_exception_handling
    File.delete(tempfile_loc('bork'))
    Sass::Plugin.update_stylesheets
    File.open(tempfile_loc('bork')) do |file|
      assert_equal("/*\nSass::SyntaxError: Undefined constant: \"!bork\".\non line 2 of #{template_loc('bork')}\n\n1: bork\n2:   :bork= !bork", file.read.split("\n")[0...6].join("\n"))
    end
    File.delete(tempfile_loc('bork'))
  end

  def test_nonfull_exception_handling
    Sass::Plugin.options[:full_exception] = false

    File.delete(tempfile_loc('bork'))
    Sass::Plugin.update_stylesheets
    assert_equal("/* Internal stylesheet error */", File.read(tempfile_loc('bork')))
    File.delete(tempfile_loc('bork'))

    Sass::Plugin.options[:full_exception] = true
  end
  
  def test_two_template_directories
    set_plugin_opts :template_location => {
      template_loc => tempfile_loc,
      template_loc(nil,'more_') => tempfile_loc(nil,'more_')
    }
    Sass::Plugin.update_stylesheets
    ['more1', 'more_import'].each { |name| assert_renders_correctly(name, 'more_') }
  end

  def test_rails_update    
    File.delete(tempfile_loc('basic'))
    assert Sass::Plugin.stylesheet_needs_update?('basic', template_loc, tempfile_loc)

    ActionController::Base.new.process

    assert !Sass::Plugin.stylesheet_needs_update?('basic', template_loc, tempfile_loc)
  end

  def test_merb_update
    begin
      require 'merb'
    rescue LoadError
      puts "\nmerb couldn't be loaded, skipping a test"
      return
    end
    
    require 'sass/plugin/merb'
    MerbHandler.send(:define_method, :process_without_sass) { |*args| }
    set_plugin_opts

    File.delete(tempfile_loc('basic'))
    assert Sass::Plugin.stylesheet_needs_update?('basic')
    
    MerbHandler.new('.').process nil, nil

    assert !Sass::Plugin.stylesheet_needs_update?('basic')
  end

  def test_doesnt_render_partials
    assert !File.exists?(tempfile_loc('_partial'))
  end

 private

  def assert_renders_correctly(name, prefix = nil)
    expected_lines = File.read(result_loc(name, prefix)).split("\n")
    actual_lines = File.read(tempfile_loc(name, prefix)).split("\n")
    expected_lines.zip(actual_lines).each_with_index do |pair, line|
      message = "template: #{name}\nline:     #{line + 1}"
      assert_equal(pair.first, pair.last, message)
    end
    if expected_lines.size < actual_lines.size
      assert(false, "#{actual_lines.size - expected_lines.size} Trailing lines found in #{name}.css: #{actual_lines[expected_lines.size..-1].join('\n')}")
    end
  end

  def template_loc(name = nil, prefix = nil)
    if name
      absolutize "#{prefix}templates/#{name}.sass"
    else
      absolutize "#{prefix}templates"
    end
  end

  def tempfile_loc(name = nil, prefix = nil)
    if name
      absolutize "#{prefix}tmp/#{name}.css"
    else
      absolutize "#{prefix}tmp"
    end
  end

  def result_loc(name = nil, prefix = nil)
    if name
      absolutize "#{prefix}results/#{name}.css"
    else
      absolutize "#{prefix}results"
    end
  end

  def absolutize(file)
    "#{File.dirname(__FILE__)}/#{file}"
  end

  def set_plugin_opts(overrides = {})
    Sass::Plugin.options = {
      :template_location => template_loc,
      :css_location => tempfile_loc,
      :style => :compact,
      :load_paths => [result_loc],
      :always_update => true,
    }.merge(overrides)
  end
end

module Sass::Plugin
  class << self
    public :stylesheet_needs_update?
  end
end

class Sass::Engine
  alias_method :old_render, :render

  def render
    raise "bork bork bork!" if @template[0] == "{bork now!}"
    old_render
  end
end

class ActionController::Base
  def sass_old_process(*args); end
end