#!/usr/bin/env ruby
require 'RGSS'
require 'optparse'

$logging = false
opts = {}
OptionParser.new do |options|
    options.banner = "This tool allows to parse RPG Maker project to .txt files and back.\n\nUsage: rvpacker-txt COMMAND [options]\n\nCOMMANDS:\n    read - Parses RPG Maker game files to .txt\n    write - Writes parsed files back to their initial form\nOPTIONS:\n"

    options.on('-d', '--input-dir DIRECTORY', 'Input directory of RPG Maker project.',
               'Must contain "Data" or "original" folder to read,',
               'and additionally "translation" with "maps" and  "other" subdirectories to write.') do |dir|
        opts[:input_dir] = dir
    end

    options.on('-l', '--log', 'Log information while processing.') do
        $logging = true
    end

    options.on('-s', '--shuffle NUMBER', 'At value 1: Shuffles all lines in strings, at value 2: shuffles all lines and words in strings.') do |number|
        opts[:shuffle] = number
    end

    options.on_tail('-h', '--help', 'Show help message.') do
        puts options
        exit
    end
end.parse!(ARGV)

if ARGV.empty?
    puts 'COMMAND argument is required.'
    exit
end

opts[:action] = ARGV.shift

unless %w[read write].include?(opts[:action])
    puts 'Invalid command. Allowed commands are: read, write.'
    exit
end

project_types = { 'vx' => :vx, 'ace' => :ace, 'xp' => :xp }

directory = opts[:input_dir]
raise "#{directory} not found" unless File.exist?(directory)

data_folder = Dir.foreach(directory).find { |filename| filename.downcase == 'original' }
data_folder = Dir.foreach(directory).find { |filename| filename.downcase == 'data' } if data_folder.nil?
raise '"Data" or "original" directory not found within input directory.' if data_folder.nil?

types = %w[vx ace xp]

type = types.find do |_type|
    case _type
        when 'xp'
            break project_types[_type] if File.exist?(File.join(directory, data_folder, 'System.rxdata'))
        when 'vx'
            break project_types[_type] if File.exist?(File.join(directory, data_folder, 'System.rvdata'))
        when 'ace'
            break project_types[_type] if File.exist?(File.join(directory, data_folder, 'System.rvdata2'))
        else
            break nil
    end
end

raise 'Couldn\'t determine project engine.' if type.nil?

RGSS.serialize(type, opts[:action], directory)