#!/usr/bin/env lua

local function ERR(msg) print(msg) end

local ok, lfs = pcall(require, 'lfs')
if not ok then
	ERR('This script requires lfs, the Lua filesystem library')
	os.exit(1)
end

local D3D_REPO_FIRMWARE_NAME = 'doodle3d-firmware'
local D3D_REPO_CLIENT_NAME = 'doodle3d-client'
local D3D_REPO_PRINT3D_NAME = 'print3d'

local paths = {}

local M = {}


local function detectOpenWrtRoot()
	local f = io.open('Makefile', 'r')
	local line = f and f:read('*line')
	local rv = (line and line:find('# Makefile for OpenWrt') == 1) and true or false

	if f then f:close() end
	return rv
end

-- returns uri (file path) of the wifibox feed, nil if not found or nil+msg on error
-- recognized feed names are 'wifibox' and 'doodle3d' (case-insensitive)
local function getWifiboxFeedRoot(feedsFile)
	local typ, nam, uri = nil, nil, nil
	local lineNo = 1
	local f = io.open(feedsFile, 'r')

	if not f then return nil, "could not open '" .. feedsFile .. '"' end

	for line in f:lines() do
		typ, nam, uri = line:match('^([^%s]+)%s+([^%s]+)%s+([^%s]+)$')

		if not (typ and nam and uri) then
			f:close()
			return uri or nil, "could not parse line " .. feedsFile .. "#" .. lineNo
		end

		local commented = (typ:find('#') == 1)
		if not commented and (nam:lower() == 'wifibox' or nam:lower() == 'doodle3d') then
			break
		else
			typ, nam, uri = nil, nil, nil
		end

		lineNo = lineNo + 1
	end

	if uri and not (typ == 'src-link' or typ == 'src-cpy') then return nil, "d3d feed has wrong type '" .. typ .. "', use 'src-link' or 'src-cpy'" end

	f:close()
	return uri
end

-- TODO: pass table to functions to fill in? if they all return either true or nil+msg, that could be used for display of ok/msg
-- returns true on success, false on error, and displays meaningful messages
--local function runCheck(msg, processFunc)
--	io.stdout:write(msg .. "... ")
--	return processFunc(--[[ hmm ]]--)
--end



local function main()
	print("Doodle3D release script")
--	local opts = parseOptions(arg)
--
--	if opts['wrt-root'] then changedir(opts['wrt-root']) end
--	if opts['cache-dir'] then paths.cache = opts['cache-dir'] end


	io.stdout:write("Checking if working directory is the OpenWrt root... ")
	local isOpenWrtRoot = detectOpenWrtRoot()
	if isOpenWrtRoot then
		print("ok")
	else
		print("unrecognized directory, try changing directories or using -wrt-root")
		os.exit(1)
	end

	io.stdout:write("Looking for Doodle3D feed path... ")
	local d3dFeed,msg = getWifiboxFeedRoot('feeds.conf')
	if d3dFeed then
		print("found " .. d3dFeed)
	else
		if msg then print("not found: " .. msg) else print("not found") end
		os.exit(1)
	end

	paths.firmware = d3dFeed .. '/' .. D3D_REPO_FIRMWARE_NAME
	paths.client = d3dFeed .. '/' .. D3D_REPO_CLIENT_NAME
	paths.print3d = d3dFeed .. '/' .. D3D_REPO_PRINT3D_NAME

	-- if empty, try to set something sensible
	if not paths.cache or paths.cache == '' then
		paths.cache = '/tmp/d3d-release-dir'
	end

	-- check if paths.cache is writable

	os.exit(1)
end


--- Only execute the main function if an arg table is present, this enables usage both as module and as standalone script.
if arg ~= nil then main() end

return M