--!strict
--!optimize 2
--!native

local Writer = {}
Writer.__index = Writer 

local Types = require("../Types")

function Writer.new(): Types.Writer
	local self = setmetatable({
		_cursor = 0,
		_size = 0,
		_refcursor = 1,
		_references = {},
		_data = buffer.create(0)
	}, Writer)
	
	return self
end

function Writer.Allocate(self: Types.Writer, bytes: number)
	local newsize = self._cursor+bytes
	if newsize < self._size then error("resizing buffer size is smaller than previous size") end
	
	local newdata = buffer.create(newsize)
	buffer.copy(newdata, 0, self._data)

	self._size = newsize
	self._data = newdata
end

function Writer.SetPacketID(self : Types.Writer, id: number)
	buffer.writeu8(self._data, self._cursor, id)
	self._cursor += 1
end

function Writer.Dump(self: Types.Writer)
	return self._data, next(self._references) and self._references
end

function Writer.Append(self: Types.Writer, packet: Types.Event, props)
	local solver, packetid = packet._solver, packet._packetid
	self:Allocate(solver.length(props)+1)
	self:SetPacketID(packetid)
	solver.write(self, props)
end

function Writer.WriteRequest(self: Types.Writer, packet: Types.Function, props)
	local solver = packet._request
	self:Allocate(solver.length(props)+1)
	self:SetPacketID(packet._packetid)
	solver.write(self, props)

	local value, references = self:Dump()
	self:Clear()

	return value, references
end

function Writer.WriteResponse(self: Types.Writer, packet: Types.Function, props)
	local solver = packet._response
	self:Allocate(solver.length(props)+1)
	self:SetPacketID(packet._packetid)
	solver.write(self, props)

	local value, references = self:Dump()
	self:Clear()

	return value, references
end

function Writer.Clear(self: Types.Writer)
	self._cursor = 0
	self._size = 0
	self._refcursor = 1
	self._references = {}
	self._data = buffer.create(0)
end

return Writer