=begin
Copyright (c) 2013 Howard Jeng

Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.

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 OR COPYRIGHT HOLDERS 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.
=end

require 'RGSS/psych_mods'
require 'fileutils'
require 'zlib'
require 'pp'
require 'formatador'
module RGSS
  def self.change_extension(file, new_ext)
    return File.basename(file, '.*') + new_ext
  end

  def self.sanitize_filename(filename)
    return filename.gsub(/[^0-9A-Za-z]+/, '_')
  end

  def self.files_with_extension(directory, extension)
    return Dir.entries(directory).select { |file| File.extname(file) == extension }
  end

  def self.inflate(str)
    text = Zlib::Inflate.inflate(str)
    return text.force_encoding("UTF-8")
  end

  def self.deflate(str)
    return Zlib::Deflate.deflate(str, Zlib::BEST_COMPRESSION)
  end

  def self.dump_data_file(file, data, time, options)
    File.open(file, "wb") do |f|
      Marshal.dump(data, f)
    end
    File.utime(time, time, file)
  end

  def self.dump_yaml_file(file, data, time, options)
    File.open(file, "wb") do |f|
      Psych::dump(data, f, options)
    end
    File.utime(time, time, file)
  end

  def self.dump_save(file, data, time, options)
    File.open(file, "wb") do |f|
      data.each do |chunk|
        Marshal.dump(chunk, f)
      end
    end
    File.utime(time, time, file)
  end

  def self.dump_raw_file(file, data, time, options)
    File.open(file, "wb") do |f|
      f.write(data)
    end
    File.utime(time, time, file)
  end

  def self.dump(dumper, file, data, time, options)
    self.method(dumper).call(file, data, time, options)
  rescue
    warn "Exception dumping #{file}"
    raise
  end

  def self.load_data_file(file)
    File.open(file, "rb") do |f|
      return Marshal.load(f)
    end
  end

  def self.load_yaml_file(file)
    formatador = Formatador.new
    obj = nil
    File.open(file, "rb") do |f|
      obj = Psych::load(f)
    end
    max = 0
    return obj unless obj.kind_of?(Array)
    seen = {}
    idx =
      obj.each do |elem|
        next if elem.nil?
        if elem.instance_variable_defined?("@id")
          id = elem.instance_variable_get("@id")
        else
          id = nil
          elem.instance_variable_set("@id", nil)
        end
        next if id.nil?

        if seen.has_key?(id)
          formatador.display_line("[red]#{file}: Duplicate ID #{id}[/]")
          formatador.indent {
            formatador.indent {
              elem.pretty_inspect.split(/\n/).each do |line|
                formatador.display_line("[red]#{line}[/]")
              end
            }
            formatador.display_line
            formatador.display_line("[red]Last seen at:\n[/]")
            formatador.indent {
              elem.pretty_inspect.split(/\n/).each do |line|
                formatador.display_line("[red]#{line}[/]")
              end
            }
          }
          exit
        end
        seen[id] = elem
        max = ((id + 1) unless id < max)
      end
    obj.each do |elem|
      next if elem.nil?
      id = elem.instance_variable_get("@id")
      if id.nil?
        elem.instance_variable_set("@id", max)
        max += 1
      end
    end
    return obj
  end

  def self.load_raw_file(file)
    File.open(file, "rb") do |f|
      return f.read
    end
  end

  def self.load_save(file)
    File.open(file, "rb") do |f|
      data = []
      while not f.eof?
        o = Marshal.load(f)
        data.push(o)
      end
      return data
    end
  end

  def self.load(loader, file)
    return self.method(loader).call(file)
  rescue
    warn "Exception loading #{file}"
    raise
  end

  def self.scripts_to_text(dirs, src, dest, options)
    formatador = Formatador.new
    src_file = File.join(dirs[:data], src)
    dest_file = File.join(dirs[:yaml], dest)
    raise "Missing #{src}" unless File.exist?(src_file)
    script_entries = load(:load_data_file, src_file)
    check_time = !options[:force] && File.exist?(dest_file)
    oldest_time = File.mtime(dest_file) if check_time

    file_map, script_index, script_code = Hash.new(-1), [], {}

    idx = 0
    script_entries.each do |script|
      idx += 1
      magic_number, script_name, code = idx, script[1], inflate(script[2])
      script_name.force_encoding("UTF-8")

      if code.length > 0
        filename = script_name.empty? ? 'blank' : sanitize_filename(script_name)
        key = filename.upcase
        value = (file_map[key] += 1)
        actual_filename = filename + (value == 0 ? "" : ".#{value}") + RUBY_EXT
        script_index.push([magic_number, script_name, actual_filename])
        full_filename = File.join(dirs[:script], actual_filename)
        script_code[full_filename] = code
        check_time = false unless File.exist?(full_filename)
        oldest_time = [File.mtime(full_filename), oldest_time].min if check_time
      else
        script_index.push([magic_number, script_name, nil])
      end
    end

    src_time = File.mtime(src_file)
    if check_time && (src_time - 1) < oldest_time
      formatador.display_line("[yellow]Skipping scripts to text[/]") if $VERBOSE
    else
      formatador.display_line("[green]Converting scripts to text[/]") if $VERBOSE
      dump(:dump_yaml_file, dest_file, script_index, src_time, options)
      script_code.each { |file, code| dump(:dump_raw_file, file, code, src_time, options) }
    end
  end

  def self.scripts_to_binary(dirs, src, dest, options)
    formatador = Formatador.new
    src_file = File.join(dirs[:yaml], src)
    dest_file = File.join(dirs[:data], dest)
    raise "Missing #{src}" unless File.exist?(src_file)
    check_time = !options[:force] && File.exist?(dest_file)
    newest_time = File.mtime(src_file) if check_time

    index = load(:load_yaml_file, src_file)
    script_entries = []
    index.each do |entry|
      magic_number, script_name, filename = entry
      code = ''
      if filename
        full_filename = File.join(dirs[:script], filename)
        raise "Missing script file #{filename}" unless File.exist?(full_filename)
        newest_time = [File.mtime(full_filename), newest_time].max if check_time
        code = load(:load_raw_file, full_filename)
      end
      script_entries.push([magic_number, script_name, deflate(code)])
    end
    if check_time && (newest_time - 1) < File.mtime(dest_file)
      formatador.display_line("[yellow]Skipping scripts to binary[/]") if $VERBOSE
    else
      formatador.display_line("[green]Converting scripts to binary[/]") if $VERBOSE
      dump(:dump_data_file, dest_file, script_entries, newest_time, options)
    end
  end

  def self.process_file(file, src_file, dest_file, dest_ext, loader, dumper, options)
    formatador = Formatador.new
    fbase = File.basename(file, File.extname(file))
    src_time = File.mtime(src_file)
    begin
      if !options[:force] && File.exist?(dest_file) && (src_time - 1) < File.mtime(dest_file)
        formatador.display_line("[yellow]Skipping #{file}[/]") if $VERBOSE
      else
        formatador.display_line("[green]Converting #{file} to #{dest_ext}[/]") if $VERBOSE
        data = load(loader, src_file)
        dump(dumper, dest_file, data, src_time, options)
      end
    rescue ArgumentError
      formatador.display_line("[_yellow_] Could not convert #{file} due to ArgumentError")
    end
  end

  def self.convert(src, dest, options)
    f = Formatador.new
    f.display_line("[green]#{options[:files].join('|')}")
    files = options[:files]
    files ||= Dir.entries(src[:directory])
    files = files.select { |file| File.extname(file) == src[:ext] }
    files -= src[:exclude]
    files.each do |file|
      src_file = File.join(src[:directory], file)
      dest_file = File.join(dest[:directory], change_extension(file, dest[:ext]))
      process_file(file, src_file, dest_file, dest[:ext], src[:load_file],
                   dest[:dump_file], options)
    end
  end

  def self.convert_saves(base, src, dest, options)
    save_files = files_with_extension(base, src[:ext])
    save_files.each do |file|
      src_file = File.join(base, file)
      dest_file = File.join(base, change_extension(file, dest[:ext]))

      process_file(file, src_file, dest_file, dest[:ext], src[:load_save],
                   dest[:dump_save], options)
    end
  end

  # [version] one of :ace, :vx, :xp
  # [direction] one of :data_bin_to_text, :data_text_to_bin, :save_bin_to_text,
  #             :save_text_to_bin, :scripts_bin_to_text, :scripts_text_to_bin,
  #             :all_text_to_bin, :all_bin_to_text
  # [directory] directory that project file is in
  # [options] :force - ignores file dates when converting (default false)
  #           :round_trip - create yaml data that matches original marshalled data skips
  #                         data cleanup operations (default false)
  #           :line_width - line width form YAML files, -1 for no line width limit
  #                         (default 130)
  #           :table_width - maximum number of entries per row for table data, -1 for no
  #                          table row limit (default 20)
  def self.serialize(version, direction, directory, options = {})
    raise "#{directory} not found" unless File.exist?(directory)

    setup_classes(version, options)
    options = options.clone()
    options[:sort] = true if [:vx, :xp].include?(version)
    options[:flow_classes] = FLOW_CLASSES
    options[:line_width] ||= 130

    table_width = options[:table_width]
    RGSS::reset_const(Table, :MAX_ROW_LENGTH, table_width ? table_width : 20)

    base = File.realpath(directory)

    dirs = {
      :base => base,
      :data => get_data_directory(base, options[:files]),
      :yaml => get_yaml_directory(base),
      :script => get_script_directory(base)
    }

    dirs.values.each do |d|
      FileUtils.mkdir(d) unless File.exist?(d)
    end

    exts = {
      :ace => ACE_DATA_EXT,
      :vx => VX_DATA_EXT,
      :xp => XP_DATA_EXT
    }

    yaml_scripts = SCRIPTS_BASE + YAML_EXT
    yaml = {
      :directory => dirs[:yaml],
      :exclude => [yaml_scripts],
      :ext => YAML_EXT,
      :load_file => :load_yaml_file,
      :dump_file => :dump_yaml_file,
      :load_save => :load_yaml_file,
      :dump_save => :dump_yaml_file
    }

    scripts = SCRIPTS_BASE + exts[version]
    data = {
      :directory => dirs[:data],
      :exclude => [scripts],
      :ext => exts[version],
      :load_file => :load_data_file,
      :dump_file => :dump_data_file,
      :load_save => :load_save,
      :dump_save => :dump_save
    }

    convert_saves = options[:database][:saves]
    convert_scripts = options[:database][:scripts]

    case direction
      # below were not used in rv packer
    when :data_bin_to_text
      convert(data, yaml, options)
      scripts_to_text(dirs, scripts, yaml_scripts, options) if convert_scripts
    when :data_text_to_bin
      convert(yaml, data, options)
      scripts_to_binary(dirs, yaml_scripts, scripts, options) if convert_scripts
    when :save_bin_to_text
      convert_saves(base, data, yaml, options) if convert_saves
    when :save_text_to_bin
      convert_saves(base, yaml, data, options) if convert_saves
    when :scripts_bin_to_text
      scripts_to_text(dirs, scripts, yaml_scripts, options) if convert_scripts
    when :scripts_text_to_bin
      scripts_to_binary(dirs, yaml_scripts, scripts, options) if convert_scripts
      # below are only options used by fusionpacker
    when :all_bin_to_text
      convert(data, yaml, options)
      scripts_to_text(dirs, scripts, yaml_scripts, options) if convert_scripts
      convert_saves(base, data, yaml, options) if convert_saves
    when :all_text_to_bin
      convert(yaml, data, options)
      scripts_to_binary(dirs, yaml_scripts, scripts, options) if convert_scripts
      convert_saves(base, yaml, data, options) if convert_saves
    else
      raise "Unrecognized direction :#{direction}"
    end
  end
end