require "java"
local HtmlLuan = require "java:luan.modules.HtmlLuan"
local HtmlParser = require "java:luan.modules.parsers.Html"
local URLEncoder = require "java:java.net.URLEncoder"
local JsonToString = require "java:goodjava.json.JsonToString"
local Luan = require "luan:Luan.luan"
local error = Luan.error
local ipairs = Luan.ipairs or error()
local pairs = Luan.pairs or error()
local type = Luan.type or error()
local Io = require "luan:Io.luan"
local output_of = Io.output_of or error()


local Html = {}

Html.decode = HtmlLuan.decode
Html.encode = HtmlLuan.encode
Html.javascript_encode = JsonToString.javascriptEncode

local quote = HtmlLuan.quote
Html.quote = quote

function Html.parse(text,container_tags)
	text or error "text required"
	container_tags = container_tags or {"script","style","textarea"}
	return HtmlParser.toList(text,container_tags)
end

function Html.url_encode(s)
	return URLEncoder.encode(s,"UTF-8")
end

local function output_tag(tag)
	%><<%= tag.name %><%
	for name, value in pairs(tag.attributes) do
		%> <%= name %><%
		if value ~= true then
			%>=<%= quote(value) %><%
		end
	end
	if tag.is_empty then
		%>/<%
	end
	%>><%
end

function Html.to_string(list)
	return output_of( function()
		for _, obj in ipairs(list) do
			local tp = type(obj)
			if tp == "string" then
				%><%= obj %><%
			elseif tp == "table" then
				tp = obj.type
				if tp == nil then
					error "no type in element of table for 'Html.to_string'"
				elseif tp == "comment" then
					%><!--<%= obj.text %>--><%
				elseif tp == "cdata" then
					%><![CDATA[<%= obj.text %>]]><%
				elseif tp == "tag" then
					output_tag(obj)
				elseif tp == "container" then
					local tag = obj.tag
					output_tag(tag)
					%><%= obj.text %></<%= tag.name %>><%
				else
					error "invalid element type for 'Html.to_string'"
				end
			else
				error("invalid value ("..tp..") in list for 'Html.to_string'")
			end
		end
	end )
end

return Html