class Pikabu

# File lib/pikabu.rb, line 8
def initialize(file_path="", line_num=nil)
  @file_path = file_path
  @line_num = line_num
  check_file_path
end

# File lib/pikabu.rb, line 59
def capture_stdout
  stdin, stdout, stderr = Open3.popen3("ruby #{@file_path}")
  @error = stderr.readlines 
    if @error == []
        puts "\nYou clever chicken! Pikabu detected no errors in your script!" 
        puts "\n"
        exec "rm #{@current_path}"
        return
     else
        m =  /.rb:(\d+)/.match(@error.first)
        @line_num = m[1].to_i
        puts "\nPikabu detected an error on line #{@line_num} of #{@file_path}"
    end
  peek  
end

# File lib/pikabu.rb, line 14
def check_file_path
  begin
    load_paths
    check_line_num
  rescue LoadError, Errno::ENOENT, TypeError => e
    print_help
  end
end

# File lib/pikabu.rb, line 23
def check_line_num
  if @line_num == nil
    capture_stdout
  elsif (@line_num.to_i>@length) || (@line_num.to_i<0) || (@line_num.to_i.to_s!=@line_num)
    puts "Please try again with a line number between 0 and #{@length}"
  else 
    @line_num = @line_num.to_i+1
    peek
  end 
end

# File lib/pikabu.rb, line 34
def load_paths
  @file = File.open(@file_path)
  @length = File.readlines(@file_path).size
  @pwd = FileUtils.pwd()
  new_file
end

# File lib/pikabu.rb, line 41
def new_file
  path_array = @file_path.split("/")
  if path_array.length==1
    @current_path = "#{@pwd}/pikabu_temp.rb"
 else
  var = path_array[0..-2].join('/')
  @current_path = "#{@pwd}/#{var}/pikabu_temp.rb"
 end 
 @f = File.new("#{@current_path}", "w")
end

# File lib/pikabu.rb, line 96
def peek
  @f.write ("require 'pry'\n")
  write_head
  @f << "binding.pry\n"
  write_tail
  @f.rewind
  system "ruby #{@current_path};rm #{@current_path}"
end

# File lib/pikabu.rb, line 52
def print_help
  puts 'Welcome to Pikabu!'
  puts 'Please use one of the following commands:'
  puts 'pikabu [file.rb]         : places a binding.pry if there is an error in your file'
  puts 'pikabu [file.rb] [line #]: places a binding.pry on the line number you specify'
end

# File lib/pikabu.rb, line 75
def write_head 
  line = 0
  @file.each do |l|
    if line < (@line_num-1)
      @f.write(l)
      line+=1
    end 
  end 
end

# File lib/pikabu.rb, line 85
def write_tail
  line = 0
  file = File.open(@file_path)
  file.each do |l|
      if line >= (@line_num-1)
        @f << l
      end 
      line+=1
    end 
  end