local mfs=dofile("/lib/mfs.lua")
local pkg_url="https://git.osmarks.tk/heavpoot/packages1/raw/branch/master/"
local res={}
local cache={}
function res.set_pkg_url(x)
	pkg_url=x
end

function res.get_pkg_url()
	return pkg_url
end

function hget(x)
	local f=http.get(x)
	if not f then return nil end
	local i=f.readAll()
	f.close()
	return i
end

function res.pkgmeta(p)
	local mt=hget(pkg_url..p.."/pkgmeta.ltn")
	if not mt then error("Package "..p.." does not have a pkgmeta.ltn!") end
	return textutils.unserialize(mt)
end

function res.pkginst(p)
	mt=res.pkgmeta(p)
	local packinfo=mfs.load(".packinfo")
	if not packinfo[p] then packinfo[p]={} end
	packinfo[p].version=mt.version or "0.1.0"
	mfs.save(".packinfo",packinfo)
	if mt.files then
		for i,thing in pairs(mt.files) do
			mfs.mmkdir("/"..i)
			for _,v in pairs(thing) do
				mfs.write("/"..i.."/"..v,hget(pkg_url..p.."/"..i.."/"..v))
			end
		end
	end
end

function res.pkguinst(p)
	mt=res.pkgmeta(p)
	local packinfo=mfs.load(".packinfo")
	if not packinfo[p] then return end
	packinfo[p]=nil
	mfs.save(".packinfo",packinfo)
	if mt.files then
		for i,thing in pairs(mt.files) do
			for _,v in pairs(thing) do
				fs.delete("/"..i.."/"..v)
			end
		end
	end
end

function res.pkginstmulti(pkgs)
	local tmp={}
	for i=1,#pkgs do
		tmp[i]=function() res.pkginst(pkgs[i]) end
	end
	parallel.waitForAll(unpack(tmp))
end

function res.dependencies(p,toplvl,x)
	toplvl=toplvl or true
	if toplvl then
		cache.vi=mfs.load(".packinfo")
	end
	x=x or {}
	if x[p]~=nil then return end
	local mt=res.pkgmeta(p)
	if cache.vi[p] then
		if mt.version==cache.vi[p].version then
			x[p]=0
			return
		end
	end
	x[p]=1
	for _,v in pairs(mt.dependencies)do
		if type(v)=="string" then
			res.dependencies(v,false,x)
		else
			res.dependencies(v.name,false,x)
		end
	end
	if toplvl then
		local res={}
		for i,v in pairs(x) do
			if v==1 then
				res[#res+1]=i
			end
		end
		return res
	end
end

return res