require 'json'

EMCC_FLAGS = ENV["EMCC_FLAGS"] || "-O3 -D_ERROR_PRINT -s ALLOW_MEMORY_GROWTH=1 -s WASM=1"

EMCC_FLAGS = "-O0 -g4 -D_ASSERT_USED -D_ERROR_PRINT -s ALLOW_MEMORY_GROWTH=1 -s WASM=1" if ENV["DEBUG"]

c_files = FileList["../src/*.c"]

UGLIFY_JS = ENV["UGLIFY_JS"] || "terser"

exported_functions = [
	"_malloc",
	"_free",
	"_memcpy",
	"_h264bsdAlloc",
	"_h264bsdFree",
	"_h264bsdInit",
	"_h264bsdDecode",
	"_h264bsdShutdown",
	"_h264bsdNextOutputPicture",
	"_h264bsdNextOutputPictureRGBA",
	"_h264bsdPicWidth",
	"_h264bsdPicHeight",
	"_h264bsdCroppingParams",
]

exported_runtime_methods = [
	'getValue',
	'setValue'
]

EXPORT_FLAGS = "-s MODULARIZE=1  -s EXPORT_NAME=H264bsd -s EXPORTED_RUNTIME_METHODS='#{JSON.generate(exported_runtime_methods)}' -s EXPORTED_FUNCTIONS='#{JSON.generate(exported_functions)}'"

file "h264bsd_wasm.js" => c_files do
	sh "emcc #{c_files.join(' ')} #{EMCC_FLAGS} #{EXPORT_FLAGS} -o h264bsd_wasm.js"
end

directory "min"

js_files = Rake::FileList.new("*.js").exclude("h264bsd_wasm.js")
js_files.each do |fl|
	file "min/#{fl}" => [fl, "min"] do
		sh "#{UGLIFY_JS} #{fl} -c -m -o min/#{fl}"
	end
end

file "min/h264bsd_wasm.js" => ["h264bsd_wasm.js", "min"] do
	cp "h264bsd_wasm.js", "min/h264bsd_wasm.js"
	cp "h264bsd_wasm.wasm", "min/h264bsd_wasm.wasm"
end

task :clean do
	FileUtils.rm_f("h264bsd_wasm.js")
	FileUtils.rm_f("h264bsd_wasm.wasm")
	FileUtils.rm_rf("min")
end

desc "Check for prereq tools"
task :setup do
	sh("emcc --version") { |ok, res| fail("Can't find emscripten binaries.") unless ok }
	puts("Ready to go")
end

desc "Check for compress prereq tools"
task :setup_compress do
	sh("#{UGLIFY_JS} --version") { |ok, res| fail("Can't find tool for minification. Please install either UglifyJS or Terser.") unless ok }
	puts("Compress ready to go")
end

task :server do
	require 'webrick'
	WEBrick::HTTPUtils::DefaultMimeTypes['wasm'] = 'application/wasm'
	WEBrick::HTTPServer.new(:Port => 8000, :DocumentRoot => Dir.pwd).start
end

task :compress => [:build, :setup_compress, "min/h264bsd_wasm.js", "min/h264bsd_canvas.js", "min/h264bsd_decoder.js", "min/h264bsd_worker.js"]
task :build => [:setup, "h264bsd_wasm.js"]

task :test do
	sh "node test_node.js"
end

task :default => [:build]