# Process handmade hero .index files into subtitles (srt files) in a specified
# directory (that must exist). Outputs all the files named to match the Resilio
# versions so they can be played alonside those files.
#
# WARNING: this code is rough, you might need to tweak it for your environment
# I tested with ruby 2.5.3
#
# This is just a rough conversion to use the annotations as subtitles for the
# entire duration until a new one is presented. (NOTE: this can be modified to
# show for a shorter time and/or fixed time -- left as an exercise for the
# reader :)  NOTE: these annotation from the .index files don't have all the same
# info as the ones on the web player as they are pure text and don't have the
# handles of the people asking the questions during Q&A.  You can see what these
# annotations look like by looking at the episode guides on the web and doing a
# search (e.g. for "4coder" at https://hero.handmade.network/episode/code).
# But, they are very useful for my purposes.
#
# To get the most up to date annotations you can query the files yourself from
# the website with wget (or something similar):
#
#   * https://hero.handmade.network/code.index
#   * https://hero.handmade.network/chat.index
#   * https://hero.handmade.network/intro-to-c.index
#   * https://hero.handmade.network/misc.index
#   * https://hero.handmade.network/ray.index
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# For more information, please refer to <http://unlicense.org/>

SRT_DIR = "srts"
FILES_TO_CONVERT = [
  "code.index",
  "ray.index",
  "chat.index",
  "misc.index",
  "intro-to-c.index"
]

@curr_file = nil
@marker = nil
@msg = ""

def hero_filename(md)
  if md[3].empty?
    "handmade_hero_#{md[1]}_#{md[2]}.srt"
  else
    "handmade_hero_#{md[1]}_#{md[2]}_#{md[3]}.srt"
  end
end

def intro_filename(md)
  if md[3].empty?
    "introduction_to_c_windows_00#{md[2]}_main.srt"
  else
    "introduction_to_c_windows_00#{md[2]}_qa.srt"
  end
end

def chat_filename(md)
  "handmade_hero_chat_#{md[2]}.srt"
end

def misc_filename(md)
  case md[0]
  when "30mlocp" then "the_thirty_million_line_problem.srt"
  when "basic_emacs" then "emacs_tutorial.srt"
  end
end

def ray_filename(md)
  "handmade_ray_#{md[2]}.srt"
end

def parse_name(line, filename)
  md = /(\D*)(\d*)(\D*)$/.match(line.split('"')[1])
  case filename
  when "code.index" then hero_filename(md)
  when "intro-to-c.index" then intro_filename(md)
  when "chat.index" then chat_filename(md)
  when "misc.index" then misc_filename(md)
  when "ray.index" then ray_filename(md)
  end
end

def new_srt_file(filename)
  @curr_file&.close
  @curr_file = File.open(File.join(SRT_DIR, filename), "w")
  @index = 1
  puts "create file: #{filename}"
end

def seconds_to_time(seconds)
  hours = seconds / 3600
  minutes = (seconds / 60) % 60
  seconds = seconds % 60
  "%02d:%02d:%02d,000" % [hours, minutes, seconds]
end

def write_subtitle(start, finish, msg)
  @curr_file.puts "#{@index}"
  @curr_file.puts "#{seconds_to_time(start)} --> #{seconds_to_time(finish)}"
  @curr_file.puts @msg
  @curr_file.puts ""

  @index += 1
end

def next_marker(line)
  _j, time, _c, *msg = line.chop.split('"') # splat/join for embedded "

  write_subtitle(@marker || 0, time.to_i, @msg) if @marker

  @marker = time.to_i
  @msg = msg.join('"')
end

def final_marker
  return unless @marker
  write_subtitle(@marker, @marker + 3000, @msg)
  @marker = nil
end

FILES_TO_CONVERT.each do |filename|
  File.open(filename).readlines.each do |line|
    if line.start_with?("name:")
      new_srt_file(parse_name(line, filename))
    elsif line.start_with?("\"")
      next_marker(line)
    elsif line.start_with?("---")
      final_marker
    end
  end
end