require 'yaml'
require 'fileutils'

def copy_to_documentation(file_path,relative_path_document)
	FileUtils.mkpath("#{relative_path_document}")
	system("cp #{file_path} #{relative_path_document}")
end

def open_file_and_find_lines_to(file_path,lines_to_scan)
	text = File.open(file_path).read
	positions_lines = []
	line_num = 0
	i = 0
	text.gsub!(/\r\n?/, "\n")
	text.each_line do |line|
		line_num += 1 
		line_match = lines_to_scan[i]
		next unless line_match
		if line.match(line_match)
			positions_lines[i] = {:line_num => line_num, :line_match => line_match}
			i += 1
		end
	end
	return positions_lines
end

def add_comment_to_top(file_path_documentation,comments)
	open(file_path_documentation, 'r+') do |f|
    	line = 0
    	while (line-=1) > 0 
      		f.readline
    	end
    	pos = f.pos
    	rest = f.read 
    	f.seek(pos)
    	comments = comments.split("&")
    	comments.each do |line|
    		f.write(line+"\n")
    	end                    
    	f.write(rest)
  	end

end

def add_documentation_to_line(file_path_documentation,line,new_lines_lines)

	new_lines = 0
	open(file_path_documentation, 'r+') do |f|
	    line_num = line[:line_num]-1
	    	while (line_num-=1) > 0          # read up to the line you want to write after
	      		f.readline
	    	end
	    	pos = f.pos                     # save your position in the file
	    	rest = f.read                   # save the rest of the file
	    	f.seek(pos)                      # go back to the old position
	    	documentation = line[:documentation].split("//")
	    	documentation.each do |line|
	    		new_lines += 1
	    		f.write(line+"\n")       # write new data
	    	end                    
	    	f.write(rest)           # write rest of file
  	end
  	return new_lines + new_lines_lines
end

def init_documentation(root)
	system("rm -R #{root}/documentation/")
	documents = YAML.load_file("#{root}/config/documentation_files.yml")
	documents.each do |document|	
		begin
			document = YAML.load_file("#{root}/"+document["file"]+".yml")
			relative_path_document = document["relative_path"]
			files = document["files"]
			@absolute_path = "#{root}/"+relative_path_document.to_s
			files.each do |documentation_file|
				documentation_file = documentation_file["file"]
				file_path = @absolute_path + documentation_file["path"]+".rb"
				copy_to_documentation(file_path,"#{root}/"+"documentation"+relative_path_document)	
				file_path_documentation = "#{root}/"+"documentation"+relative_path_document+documentation_file["path"]+".rb"
				#Agregar comentarios al inicio del archivo
				comments = documentation_file["comments"]
				#Agregar documentation YARN
				body = documentation_file["body"]
				lines_to_scan = body.keys
				positions_lines = open_file_and_find_lines_to(file_path,lines_to_scan)
				new_lines = 0
				positions_lines.each_with_index do |line,index|
					line[:documentation] = body[line[:line_match]]["documentation"]
					line[:line_num] +=  new_lines
					new_lines = add_documentation_to_line(file_path_documentation,line,new_lines)
				end	
				add_comment_to_top(file_path_documentation,comments)
				puts "Terminado archivo: "+file_path_documentation.to_s
			end
		rescue Exception => e
			puts e
			next
		end
	end
end