#!/usr/bin/env ruby
# frozen_string_literal: true

require 'liquid'
require 'fileutils'

THEME_NAME = 'iPawbMini'
# MAIN_MENU_TITLE = 'iPod mini'
MAIN_MENU_TITLE = 'iPawb mini'

DEST_DIR = File.join(__dir__, 'dist', THEME_NAME)

TEMPLATE_PATH = File.join(__dir__, 'templates')
BASE_TEMPLATE = 'base.liquid'
TEMPLATES = {
  'fms.liquid' => "wps/#{THEME_NAME}.fms",
  'sbs.liquid' => "wps/#{THEME_NAME}.sbs",
  'wps.liquid' => "wps/#{THEME_NAME}.wps"
}.freeze

THEME_CONFIG = {
  **TEMPLATES.map { |_, path| [path.split('.').last.downcase, "/.rockbox/#{path}"] }.to_h,
  'selector type' => 'bar (inverse)',
  'filetype colours' => '-',
  'font' => '/.rockbox/fonts/10-Espy Sans-Bold.fnt',
  'statusbar' => 'off',
  'scrollbar' => 'right',
  'scrollbar width' => '9',
  'battery display' => 'graphic',
  'show icons' => 'on',
  'ui viewport' => '-'
}.freeze

def new_liquid(template_path)
  Liquid::Template.parse(IO.read(File.join(TEMPLATE_PATH, template_path)))
end

base_vars = {
  'theme_name' => THEME_NAME,
  'main_menu_title' => MAIN_MENU_TITLE,
  'generated_at' => Time.now.to_s
}.freeze

FileUtils.mkdir_p(DEST_DIR)

puts "===> Generating WPS screens"
FileUtils.mkdir_p(File.join(DEST_DIR, 'wps'))
TEMPLATES.each do |src, dst|
  vars = base_vars.merge('filename' => src)
  template = new_liquid(src)
  content = template.render(**vars).strip
  assigns = template.instance_assigns.transform_values(&:chomp)
  result = new_liquid(BASE_TEMPLATE).render(
    'content' => content,
    'filename' => src,
    **vars,
    **assigns
  )

  dest_full = File.join(DEST_DIR, dst)
  puts "writing #{dest_full} ..."
  File.open(dest_full, 'w') do |f|
    f.puts result
  end
end

puts "===> Generating theme config"
FileUtils.mkdir_p(File.join(DEST_DIR, 'themes'))
File.open(File.join(DEST_DIR, 'themes', "#{THEME_NAME}.cfg"), 'w') do |f|
  f.puts "# #{THEME_NAME} Rockbox theme"
  f.puts "# Generated using gen_theme.rb at #{base_vars['generated_at']}"
  f.puts

  THEME_CONFIG.each do |key, value|
    f.puts "#{key}: #{value}"
  end
end

def copy(kind, pattern, dest_dir)
  source_files = Dir[*pattern]
  return if source_files.empty?

  puts "===> Copying #{kind}"
  FileUtils.mkdir_p(dest_dir)
  source_files.each do |source_file|
    dest_file = File.join(dest_dir, File.basename(source_file))
    puts dest_file
    FileUtils.cp(source_file, dest_file)
  end
end

copy :fonts, File.join(__dir__, 'fonts', '*.fnt'), File.join(DEST_DIR, 'fonts')
copy :images, File.join(__dir__, 'images', '*.bmp'), File.join(DEST_DIR, 'wps', THEME_NAME)