local Luan = require "luan:Luan"
local load = Luan.load
local try = Luan.try
local Io = require "luan:Io"
local print = Io.print
local Http = require "luan:web/Http"
local String = require "luan:String"
local Html = require "luan:Html"

local function lines(s)
	local matcher = s.gmatch "([^\n]*)\n|([^\n])+$"
	return function()
		local m1, m2 = matcher()
		return m1 or m2
	end
end

local function print_with_line_numbers(s)
	i = 1
	for line in lines(s) do
		print(i,line)
		i = i + 1
	end
end

local function form()
	Html.simply_html_page{
		head = function() %>
			<title>Run Luan Code</title>
<%		end;
		body = function() %>
			<center margin-top=10>
				<h3>Run Luan Code</h3>
			</center>
			<form name="form0" method="post">
				<input type="hidden" name="content_type" value="text/plain" />
				<center>
					<textarea name="code" rows="20" cols="90" wrap="off" autofocus></textarea>
				</center>
				<center margin-top=5>
					<input type="submit" value="Execute Luan Code" textcolor="white" bgcolor="#337ab7"/>
				</center>
			</form>
<%		end;
	}
end

function service()
	Io.stdout = Http.response.text_writer()
	local code = Http.request.parameters.code
	if code == nil then
		form()
		return
	end
	local content_type = Http.request.parameters.content_type
	if content_type ~= nil then
		Http.response.content_type = content_type
	end
	local env = {
		request = Http.request;
		response = Http.response;
	}
	try {
		function()
			local run = load(code,"<web_run>",env)
			run()
		end;
		catch = function(e)
			Http.response.content_type = "text/plain"
			print(e)
			print()
			print()
			print_with_line_numbers(code)
		end;
	}
end