local wifi = require('network.wlanconfig')
local netconf = require('network.netconfig')
local settings = require('util.settings')

-- NOTE: the module 'detects' command-line invocation by existence of 'arg', so we have to make sure it is not defined.
argStash = arg
arg = nil
local updater = require('script.d3d-updater')
arg = argStash

local log = require('util.logger')
local utils = require('util.utils')
local accessManager = require('util.access')
local printerAPI = require('rest.api.api_printer')

local M = {
	isApi = true
}


-- TODO: this function is also defined in 2 other places, combine them (and avoid require loops)
local function operationsAccessOrFail(request, response)
	if not accessManager.hasControl(request.remoteAddress) then
		response:setFail("No control access")
		return false
	end

	local rv, printerState = printerAPI.state(request, response, true)
	if(rv == false) then
		response:setError("Could not get printer state")
		return false
	end

	if printerState == 'buffering' or printerState == 'printing' or printerState == 'stopping' then
		response:setFail("Printer is busy, please wait")
		return false
	end

	return true
end


function M.status(request, response)
	updater.setLogger(log)
	updater.setUseCache(false)
	local success,status,msg = updater.getStatus()

	--response:addData('current_version', status.currentVersion)
	response:addData('current_version', updater.formatVersion(status.currentVersion))

	response:addData('state_code', status.stateCode)
	response:addData('state_text', status.stateText)

	if not success then
		response:setFail(msg)
		return
	end

	local canUpdate = updater.compareVersions(status.newestVersion, status.currentVersion) > 0

	--response:addData('newest_version', status.newestVersion)
	response:addData('newest_version', updater.formatVersion(status.newestVersion))
	response:addData('can_update', canUpdate)

	if status.progress then response:addData('progress', status.progress) end
	if status.imageSize then response:addData('image_size', status.imageSize) end
	response:setSuccess()
end

-- accepts: version(string) (major.minor.patch)
-- accepts: clear_gcode(bool, defaults to true) (this is to lower the chance on out-of-memory crashes, but still allows overriding this behaviour)
-- accepts: clear_images(bool, defaults to true) (same rationale as with clear_gcode)
-- note: call this with a long timeout - downloading may take a while (e.g. ~3.3MB with slow internet...)
function M.download_POST(request, response)
	local argVersion = request:get("version")
	local argClearGcode = utils.toboolean(request:get("clear_gcode"))
	local argClearImages = utils.toboolean(request:get("clear_images"))
	if argClearGcode == nil then argClearGcode = true end
	if argClearImages == nil then argClearImages = true end

	-- block access to prevent potential issues with printing (e.g. out of memory)
	if not operationsAccessOrFail(request, response) then return end

	updater.setLogger(log)

	updater.setState(updater.STATE.DOWNLOADING,"")

	local vEnt, rv, msg

	if not argVersion then
		local success,status,msg = updater.getStatus()
		if not success then
			updater.setState(updater.STATE.DOWNLOAD_FAILED, msg)
			response:setFail(msg)
			return
		else
			argVersion = updater.formatVersion(status.newestVersion)
		end
	end

	if argClearImages then
		rv,msg = updater.clear()
		if not rv then
			updater.setState(updater.STATE.DOWNLOAD_FAILED, msg)
			response:setFail(msg)
			return
		end
	end

	if argClearGcode then
		response:addData('gcode_clear',true)
		local rv,msg = printer:clearGcode()

		if not rv then
			updater.setState(updater.STATE.DOWNLOAD_FAILED, msg)
			response:setError(msg)
			return
		end
	end

	vEnt,msg = updater.findVersion(argVersion)
	if vEnt == nil then
		updater.setState(updater.STATE.DOWNLOAD_FAILED, "error searching version index (" .. msg .. ")")
		response:setFail("error searching version index (" .. msg .. ")")
		return
	elseif vEnt == false then
		updater.setState(updater.STATE.DOWNLOAD_FAILED, "no such version")
		response:setFail("no such version")
		return
	end

	rv,msg = updater.downloadImageFile(vEnt)
	if not rv then
		updater.setState(updater.STATE.DOWNLOAD_FAILED, msg)
		response:setFail(msg)
		return
	end

	response:setSuccess()
end

-- if successful, this call won't return since the device will flash its memory and reboot
function M.install_POST(request, response)
	local argVersion = request:get("version")
	log:info("API:update/install")

	if not operationsAccessOrFail(request, response) then return end

	updater.setLogger(log)
	updater.setState(updater.STATE.INSTALLING,"")
	
	local ssid = wifi.getSubstitutedSsid(settings.get('network.ap.ssid'))
	local rv,msg = netconf.enableAccessPoint(ssid)
	
	if not argVersion then
		local success,status,msg = updater.getStatus()
		if not success then
			updater.setState(updater.STATE.INSTALL_FAILED, msg)
			response:setFail(msg)
			return
		else
			argVersion = updater.formatVersion(status.newestVersion)
		end
	end

	vEnt,msg = updater.findVersion(argVersion)
	if vEnt == nil then
		updater.setState(updater.STATE.INSTALL_FAILED, "error searching version index (" .. msg .. ")")
		response:setFail("error searching version index (" .. msg .. ")")
		return
	elseif vEnt == false then
		updater.setState(updater.STATE.INSTALL_FAILED, "no such version")
		response:setFail("no such version")
		return
	end

	local rv,msg = updater.flashImageVersion(vEnt)

	if not rv then
		updater.setState(updater.STATE.INSTALL_FAILED, "installation failed (" .. msg .. ")")
		response:setFail("installation failed (" .. msg .. ")")
	else
		response:setSuccess()
	end
end

function M.clear_POST(request, response)
	updater.setLogger(log)
	local rv,msg = updater.clear()

	if rv then response:setSuccess()
	else response:setFail(msg)
	end
end

return M