# ==========================================
#   Unity Project - A Test Framework for C
#   Copyright (c) 2007 Mike Karlesky, Mark VanderVoord, Greg Williams
#   [Released under MIT License. Please refer to license.txt for details]
# ==========================================

# This script creates all the files with start code necessary for a new module.
# A simple module only requires a source file, header file, and test file.
# Triad modules require a source, header, and test file for each triad type (like model, conductor, and hardware).

require 'rubygems'
require 'fileutils'
require 'pathname'

# TEMPLATE_TST
TEMPLATE_TST ||= '#include "unity.h"

%2$s#include "%1$s.h"

void setUp(void)
{
}

void tearDown(void)
{
}

void test_%1$s_NeedToImplement(void)
{
    TEST_IGNORE_MESSAGE("Need to Implement %1$s");
}
'.freeze

# TEMPLATE_SRC
TEMPLATE_SRC ||= '%2$s#include "%1$s.h"
'.freeze

# TEMPLATE_INC
TEMPLATE_INC ||= '#ifndef %3$s_H
#define %3$s_H
%2$s

#endif // %3$s_H
'.freeze

class UnityModuleGenerator
  ############################
  def initialize(options = nil)
    @options = UnityModuleGenerator.default_options
    case options
    when NilClass then @options
    when String   then @options.merge!(UnityModuleGenerator.grab_config(options))
    when Hash     then @options.merge!(options)
    else raise 'If you specify arguments, it should be a filename or a hash of options'
    end

    # Create default file paths if none were provided
    @options[:path_src] = "#{__dir__}/../src/"   if @options[:path_src].nil?
    @options[:path_inc] = @options[:path_src]    if @options[:path_inc].nil?
    @options[:path_tst] = "#{__dir__}/../test/"  if @options[:path_tst].nil?
    @options[:path_src] += '/'                unless @options[:path_src][-1] == 47
    @options[:path_inc] += '/'                unless @options[:path_inc][-1] == 47
    @options[:path_tst] += '/'                unless @options[:path_tst][-1] == 47

    # Built in patterns
    @patterns = {
      'src'  =>  {
        '' =>  { inc: [] }
      },
      'test' =>  {
        '' =>  { inc: [] }
      },
      'dh'   =>  {
        'Driver'    =>  { inc: [create_filename('%1$s', 'Hardware.h')] },
        'Hardware'  =>  { inc: [] }
      },
      'dih'  =>  {
        'Driver'    =>  { inc: [create_filename('%1$s', 'Hardware.h'), create_filename('%1$s', 'Interrupt.h')] },
        'Interrupt' =>  { inc: [create_filename('%1$s', 'Hardware.h')] },
        'Hardware'  =>  { inc: [] }
      },
      'mch'  =>  {
        'Model'     =>  { inc: [] },
        'Conductor' =>  { inc: [create_filename('%1$s', 'Model.h'), create_filename('%1$s', 'Hardware.h')] },
        'Hardware'  =>  { inc: [] }
      },
      'mvp'  =>  {
        'Model'     =>  { inc: [] },
        'Presenter' =>  { inc: [create_filename('%1$s', 'Model.h'), create_filename('%1$s', 'View.h')] },
        'View'      =>  { inc: [] }
      }
    }
  end

  ############################
  def self.default_options
    {
      pattern: 'src',
      includes: {
        src: [],
        inc: [],
        tst: []
      },
      update_svn: false,
      boilerplates: {},
      test_prefix: 'Test',
      mock_prefix: 'Mock'
    }
  end

  ############################
  def self.grab_config(config_file)
    options = default_options
    unless config_file.nil? || config_file.empty?
      require 'yaml'
      yaml_guts = YAML.load_file(config_file)
      options.merge!(yaml_guts[:unity] || yaml_guts[:cmock])
      raise "No :unity or :cmock section found in #{config_file}" unless options
    end
    options
  end

  ############################
  def files_to_operate_on(module_name, pattern = nil)
    # strip any leading path information from the module name and save for later
    subfolder = File.dirname(module_name)
    module_name = File.basename(module_name)

    # create triad definition
    prefix = @options[:test_prefix] || 'Test'
    triad = [{ ext: '.c', path: @options[:path_src], prefix: '', template: TEMPLATE_SRC, inc: :src, boilerplate: @options[:boilerplates][:src] },
             { ext: '.h', path: @options[:path_inc], prefix: '',     template: TEMPLATE_INC, inc: :inc, boilerplate: @options[:boilerplates][:inc] },
             { ext: '.c', path: @options[:path_tst], prefix: prefix, template: TEMPLATE_TST, inc: :tst, boilerplate: @options[:boilerplates][:tst] }]

    # prepare the pattern for use
    pattern = (pattern || @options[:pattern] || 'src').downcase
    patterns = @patterns[pattern]
    raise "ERROR: The design pattern '#{pattern}' specified isn't one that I recognize!" if patterns.nil?

    # single file patterns (currently just 'test') can reject the other parts of the triad
    triad.select! { |v| v[:inc] == :tst } if pattern == 'test'

    # Assemble the path/names of the files we need to work with.
    files = []
    triad.each do |cfg|
      patterns.each_pair do |pattern_file, pattern_traits|
        submodule_name = create_filename(module_name, pattern_file)
        filename = cfg[:prefix] + submodule_name + cfg[:ext]
        files << {
          path: (Pathname.new("#{cfg[:path]}#{subfolder}") + filename).cleanpath,
          name: submodule_name,
          template: cfg[:template],
          boilerplate: cfg[:boilerplate],
          includes: case (cfg[:inc])
                    when :src then (@options[:includes][:src] || []) | (pattern_traits[:inc].map { |f| format(f, module_name) })
                    when :inc then (@options[:includes][:inc] || [])
                    when :tst then (@options[:includes][:tst] || []) | (pattern_traits[:inc].map { |f| format("#{@options[:mock_prefix]}#{f}", module_name) })
                    end
        }
      end
    end

    files
  end

  ############################
  def create_filename(part1, part2 = '')
    if part2.empty?
      case (@options[:naming])
      when 'bumpy' then part1
      when 'camel' then part1
      when 'snake' then part1.downcase
      when 'caps'  then part1.upcase
      else              part1
      end
    else
      case (@options[:naming])
      when 'bumpy' then part1 + part2
      when 'camel' then part1 + part2
      when 'snake' then part1.downcase + '_' + part2.downcase
      when 'caps'  then part1.upcase + '_' + part2.upcase
      else              part1 + '_' + part2
      end
    end
  end

  ############################
  def generate(module_name, pattern = nil)
    files = files_to_operate_on(module_name, pattern)

    # Abort if all of the module files already exist
    all_files_exist = true
    files.each do |file|
      all_files_exist = false unless File.exist?(file[:path])
    end
    raise "ERROR: File #{files[0][:name]} already exists. Exiting." if all_files_exist

    # Create Source Modules
    files.each_with_index do |file, _i|
      # If this file already exists, don't overwrite it.
      if File.exist?(file[:path])
        puts "File #{file[:path]} already exists!"
        next
      end
      # Create the path first if necessary.
      FileUtils.mkdir_p(File.dirname(file[:path]), verbose: false)
      File.open(file[:path], 'w') do |f|
        f.write("#{file[:boilerplate]}\n" % [file[:name]]) unless file[:boilerplate].nil?
        f.write(file[:template] % [file[:name],
                                   file[:includes].map { |ff| "#include \"#{ff}\"\n" }.join,
                                   file[:name].upcase])
      end
      if @options[:update_svn]
        `svn add \"#{file[:path]}\"`
        if $!.exitstatus.zero?
          puts "File #{file[:path]} created and added to source control"
        else
          puts "File #{file[:path]} created but FAILED adding to source control!"
        end
      else
        puts "File #{file[:path]} created"
      end
    end
    puts 'Generate Complete'
  end

  ############################
  def destroy(module_name, pattern = nil)
    files_to_operate_on(module_name, pattern).each do |filespec|
      file = filespec[:path]
      if File.exist?(file)
        if @options[:update_svn]
          `svn delete \"#{file}\" --force`
          puts "File #{file} deleted and removed from source control"
        else
          FileUtils.remove(file)
          puts "File #{file} deleted"
        end
      else
        puts "File #{file} does not exist so cannot be removed."
      end
    end
    puts 'Destroy Complete'
  end
end

############################
# Handle As Command Line If Called That Way
if $0 == __FILE__
  destroy = false
  options = {}
  module_name = nil

  # Parse the command line parameters.
  ARGV.each do |arg|
    case arg
    when /^-d/            then destroy = true
    when /^-u/            then options[:update_svn] = true
    when /^-p\"?(\w+)\"?/ then options[:pattern] = Regexp.last_match(1)
    when /^-s\"?(.+)\"?/  then options[:path_src] = Regexp.last_match(1)
    when /^-i\"?(.+)\"?/  then options[:path_inc] = Regexp.last_match(1)
    when /^-t\"?(.+)\"?/  then options[:path_tst] = Regexp.last_match(1)
    when /^-n\"?(.+)\"?/  then options[:naming] = Regexp.last_match(1)
    when /^-y\"?(.+)\"?/  then options = UnityModuleGenerator.grab_config(Regexp.last_match(1))
    when /^(\w+)/
      raise "ERROR: You can't have more than one Module name specified!" unless module_name.nil?

      module_name = arg
    when /^-(h|-help)/
      ARGV = [].freeze
    else
      raise "ERROR: Unknown option specified '#{arg}'"
    end
  end

  unless ARGV[0]
    puts ["\nGENERATE MODULE\n-------- ------",
          "\nUsage: ruby generate_module [options] module_name",
          "  -i\"include\" sets the path to output headers to 'include' (DEFAULT ../src)",
          "  -s\"../src\"  sets the path to output source to '../src'   (DEFAULT ../src)",
          "  -t\"C:/test\" sets the path to output source to 'C:/test'  (DEFAULT ../test)",
          '  -p"MCH"     sets the output pattern to MCH.',
          '              dh   - driver hardware.',
          '              dih  - driver interrupt hardware.',
          '              mch  - model conductor hardware.',
          '              mvp  - model view presenter.',
          '              src  - just a source module, header and test. (DEFAULT)',
          '              test - just a test file.',
          '  -d          destroy module instead of creating it.',
          '  -n"camel"   sets the file naming convention.',
          '              bumpy - BumpyCaseFilenames.',
          '              camel - camelCaseFilenames.',
          '              snake - snake_case_filenames.',
          '              caps  - CAPS_CASE_FILENAMES.',
          '  -u          update subversion too (requires subversion command line)',
          '  -y"my.yml"  selects a different yaml config file for module generation',
          ''].join("\n")
    exit
  end

  raise 'ERROR: You must have a Module name specified! (use option -h for help)' if module_name.nil?

  if destroy
    UnityModuleGenerator.new(options).destroy(module_name)
  else
    UnityModuleGenerator.new(options).generate(module_name)
  end

end
