class UnityTestRunnerGenerator

  def run(input_file, output_file, additional_includes=[], tab='  ')
    @tab = tab
    tests = []
    includes = []
    used_mocks = []
    
    module_name = File.basename(input_file)
    
    File.open(input_file, 'r') do |input|
      tests = find_tests(input)
      includes = find_includes(input)
      used_mocks = find_mocks(includes)
    end

    File.open(output_file, 'w') do |output|
      create_header(output, used_mocks, additional_includes)
      create_externs(output, tests, used_mocks)
      create_mock_management(output, used_mocks)
      create_runtest(output, used_mocks)
      create_main(output, module_name, tests)
    end
    
    all_files_used = [input_file, output_file]
    all_files_used += includes.map {|filename| filename + '.c'} unless includes.empty?
    all_files_used += additional_includes unless additional_includes.empty?
    return all_files_used.uniq
  end
  
  def find_tests(input_file)
    input_file.rewind
    tests = []
    source = input_file.read()
    source = source.gsub(/\/\/.*$/, '') #remove line comments
    source = source.gsub(/\/\*.*?\*\//m, '') #remove block comments
    lines = source.split(/(^\s*\#.*$)  # Treat preprocessor directives as a logical line
                              | (;|\{|\}) /x) # Match ;, {, and } as end of lines
    lines.each do |line|
      if line =~ /^\s*void\s+test(.*?)\s*\(\s*void\s*\)/
        tests << "test" + $1
      end
    end
    return tests
  end

  def find_includes(input_file)
    input_file.rewind
    includes = []
    input_file.readlines.each do |line|
      scan_results = line.scan(/^#include\s+\"\s*(.+)\.h\s*\"/)
      includes << scan_results[0][0] if (scan_results.size > 0)
    end
    return includes
  end
  
  def find_mocks(includes)
    mock_headers = []
    includes.each do |include_file|
      mock_headers << include_file if include_file.include? "Mock"
    end
    return mock_headers  
  end
  
  def create_header(output, mocks, additional_includes=[])
    output.puts('/* AUTOGENERATED FILE. DO NOT EDIT. */')
    output.puts('#include "unity.h"')
    additional_includes.each do |includes|
      output.puts("#include \"#{includes}.h\"")
    end
    mocks.each do |mock|
      output.puts("#include \"#{mock}.h\"")
    end
    output.puts('#include <setjmp.h>')
    output.puts('#include <stdio.h>')
    output.puts('')
    output.puts('jmp_buf AbortFrame;')
    output.puts('')    
    output.puts('char MessageBuffer[50];')
  end
  
  
  def create_externs(output, tests, mocks)
    output.puts('')

    output.puts("extern void setUp(void);")
    output.puts("extern void tearDown(void);")

    output.puts('')

    tests.each do |test|
      output.puts("extern void #{test}(void);")
    end
    
    output.puts('')
  end
  
  
  def create_mock_management(output, mocks)
    unless (mocks.empty?)
      output.puts("static void CMock_Init(void)")
      output.puts("{")
      mocks.each do |mock|
        output.puts("#{@tab}#{mock}_Init();")
      end
      output.puts("}\n")

      output.puts("static void CMock_Verify(void)")
      output.puts("{")
      mocks.each do |mock|
        output.puts("#{@tab}#{mock}_Verify();")
      end
      output.puts("}\n")

      output.puts("static void CMock_Destroy(void)")
      output.puts("{")
      mocks.each do |mock|
        output.puts("#{@tab}#{mock}_Destroy();")
      end
      output.puts("}\n")
    end
  end
  
  
  def create_runtest(output, used_mocks)
    output.puts("static void runTest(UnityTestFunction test)")
    output.puts("{")
    output.puts("#{@tab}if (TEST_PROTECT())")
    output.puts("#{@tab}{")
    output.puts("#{@tab}#{@tab}CMock_Init();") unless (used_mocks.empty?) 
    output.puts("#{@tab}#{@tab}setUp();")
    output.puts("#{@tab}#{@tab}test();")
    output.puts("#{@tab}#{@tab}CMock_Verify();") unless (used_mocks.empty?)
    output.puts("#{@tab}}")
    output.puts("#{@tab}CMock_Destroy();") unless (used_mocks.empty?)
    output.puts("#{@tab}tearDown();")
    output.puts("}")
  end
  
  
  def create_main(output, module_name, tests)
    output.puts()
    output.puts()
    output.puts("int main(void)")
    output.puts("{")
    output.puts("#{@tab}Unity.TestFile = \"#{module_name}\";")
    output.puts("#{@tab}UnityBegin();")
    output.puts()

    output.puts("#{@tab}// RUN_TEST calls runTest")  	
    tests.each do |test|
      output.puts("#{@tab}RUN_TEST(#{test});")
    end

    output.puts()
    output.puts("#{@tab}UnityEnd();")
    output.puts("#{@tab}return 0;")
    output.puts("}")
  end

end


if ($0 == __FILE__)
  usage = "usage: ruby #{__FILE__} input_test_file output_test_runner"
  
  if !ARGV[0]
    puts usage
    exit 1
  end
  
  ARGV[1] = ARGV[0].gsub(".c","_sRunner.c") if (!ARGV[1])
  
  UnityTestRunnerGenerator.new
  UnityTestRunnerGenerator.run(ARGV[0], ARGV[1])
end