module GCPS2TILES

# File lib/gcps2tiles.rb, line 25
def self.create_tile_files(options)
  python_path = options['python_path']
  gdal2tiles_path = options['gdal2tiles_path']
  output_dir_path = options['output_dir_path']
  vrt_file_path = create_vrt_file(options)
  program = "#{python_path} #{gdal2tiles_path} --s_srs epsg:3857 #{vrt_file_path} #{output_dir_path}"
  print 'run '.colorize(:blue)
  puts program.colorize(:light_blue)
  x = Open3.popen3(program) do |i, o, e, w|
    o.each_char{ |char| print char }
    e.each_char{ |char| print char }
    p w
  end
  p x.value
end

# File lib/gcps2tiles.rb, line 9
def self.create_vrt_file(options)
  gcps = GCPs.new(options['gcps_file_path']).csv.map { |row|
    [row[:pixelx].to_f, -row[:pixely].to_f, row[:mapx].to_f, row[:mapy].to_f].join(' ')
  }.map { |gcp|
    "-gcp #{gcp}"
  }.join(' ')
  gdal_translate_path = options['gdal_translate_path']
  image_file_path = options['image_file_path']
  vrt_file_path = Tempfile.open(File.basename(image_file_path, File.extname(image_file_path)) + '.vrt'){ |f| f.to_path }
  program = "#{gdal_translate_path} -of VRT #{gcps} #{image_file_path} #{vrt_file_path}"
  print 'run '.colorize(:blue)
  puts program.colorize(:light_blue)
  status, = systemu(program)
  return vrt_file_path if status.success?
end

# File lib/gcps2tiles.rb, line 41
def self.execute(options)
  p options
  # %w(gdal_translate gdalwarp gdal2tiles python cs2cs).map{ |program|
  #   options["#{program}_path"]
  # }.each{ |program|
  #   which(program)
  # }

  create_tile_files(options)
end