class SRTParse

# File lib/mutasrt.rb, line 12
def duration(line)
        timestamp = line.split("-->")
        time_from = timestamp.first.gsub(/,/,".").split(":").last.to_f.round()
        time_to = timestamp.last.gsub(/,/,".").split(":").last.to_f.round()
        duration = time_to - time_from + (time_to < time_from ? 60 : 0)
        return duration
end

# File lib/mutasrt.rb, line 2
def find_avarages(results)
        #find avarage symbols per line
        results["average_symbols_per_line"] = (results["number_of_symbols"].to_f/results["number_of_lines"]).round(2)
        #find avarage symbols per sentence
        results["average_symbols_per_sentence"] = (results["number_of_symbols"].to_f/results["number_of_sentences"]).round(2)
        #find avarage duration
        results["average_duration"] = (results["duration"]/results["number_of_subtitles"]).round(2)
        return results
end

# File lib/mutasrt.rb, line 20
def max_symbols_per_line(line, max_symbols)
        current_line_symbols = line.scan(/[[:punct:]]/).count
        if current_line_symbols > max_symbols then
                return current_line_symbols
        else
                return max_symbols
        end
end

# File lib/mutasrt.rb, line 29
def parse_file(path_to_file)
        #define Hash and vars
        results = Hash.new(0)
        lines_after_blank = 0
        
        #reading file line by line
        File.open(path_to_file, "r") do |infile|
                infile.each_line do |line|
                        #if line is blank null the num after blank
                        if line =~ /^[\s]*$\n/ then
                                lines_after_blank = 0
                                next
                        end #if
                        
                        case lines_after_blank
                        when 0 then #when line is the number of subtitle
                                results["number_of_subtitles"] = line.to_i
                        when 1 then #when line is the time from-to
                                results["duration"] += duration(line)
                        else #when line is text
                                results["number_of_words"] += line.gsub(/[[:punct:]]/, '').split.length
                                results["number_of_symbols"] += line.scan(/[[:punct:]]/).count
                                results["number_of_lines"] += 1
                                results["max_symbols_per_line"] = max_symbols_per_line( line, results["max_symbols_per_line"])
                                results["number_of_sentences"] += line.scan(/[^\.!?]+[\.!?]/).count
                        end #end of case
                        lines_after_blank += 1
                end #infile
        end #fopen
        #finished reading file line by line
        return find_avarages(results)
end