#!/usr/bin/lua
--[[

	Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
	Copyright (C) 2021 Darryl Quinn
	See Contributors file for additional contributors

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation version 3 of the License.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.	If not, see <http://www.gnu.org/licenses/>.

	Additional Terms:

	Additional use restrictions exist on the AREDN(TM) trademark and logo.
		See AREDNLicense.txt for more info.

	Attributions to the AREDN Project must be retained in the source code.
	If importing this code into a new or existing project attribution
	to the AREDN project must be added to the source code.

	You must not misrepresent the origin of the material contained within.

	Modified versions must be modified to attribute to the original source
	and be marked in reasonable ways as differentiate it from the original
	version

--]]

require("uci")
require("aredn.uci")
require("aredn.utils")
require("aredn.http")
local aredn_olsr = require("aredn.olsr")
local aredn_info = require("aredn.info")
require("nixio")
local json = require("luci.jsonc")
require("iwinfo")

-- Function extensions
os.capture = capture


_G.switch = function(param, case_table)
    local case = case_table[param]
    if case then return case() end
    local def = case_table['default']
    return def and def() or nil
end

function addQueryStringData(qs, qsset)
	local res = {}
	res['raw'] = qs
	if res['raw'] ~= nil then
		res['params'] = qsset
	end
	return res	
end

-- ==== MAIN =====
local request={}
local response={}
local topic=nil

-- PRE-PROCESS INCOMING REQUEST
local qsset={}
local qs=""
local method=""

if (arg[1]==nil) then			-- FROM CGI
	method=nixio.getenv("REQUEST_METHOD")
	qs=nixio.getenv("QUERY_STRING")
	qsset=parseQueryString(qs)
else 							-- FROM CMDLINE: ./apiprotected GET topic=setup_basic
	method=arg[1]
	qsset=parseQueryString(arg[2])
end

request['method']=method
request['authorization']=nixio.getenv("HTTP_AUTHORIZATION")
request['content_type']=nixio.getenv("CONTENT_TYPE")
request['query_string'] = addQueryStringData(qs, qsset)

-- ADD additional elements by METHOD type
if method=='GET' then			-- READ	
	topic=request['query_string']['params']['topic']
elseif method=='OPTIONS' then			-- OPTIONS
	-- skip
elseif method=='POST' then		-- UPDATE
	request['content_length']=nixio.getenv("CONTENT_LENGTH")
	rawcontent=io.read("*all")
	request['content']=json.parse(rawcontent)
	topic = request['content']['topic']
elseif method=='PUT' then		-- CREATE
	request['content_length']=nixio.getenv("CONTENT_LENGTH")
	request['content']=io.read("*all")
elseif method=='DELETE' then	-- DELETE
	local x=true
else
	request['content_length']=nixio.getenv("CONTENT_LENGTH")
	request['content']=io.read("*all")
end



-- -------------------------------------------------
function getController(t, req)
	cname = "aredn.controller." .. t
	-- TODO: need to catch errors on non-existent controllers below
	local status, c = pcall(require, cname)
	if (status) then
		return c:new(req)
	else
		return nil
	end
end


-- determine the proper controller
if topic then
	local controller = getController(topic, request)	-- setup.basic, setup.meshrf, etc
	if (controller) then
		response=controller:process()
	else
		response['error']="Controller '" .. topic .. "' not found"
		response['success']=false
	end
end

-- Output the HTTP header for JSON
-- json_header()
json_header()

-- Output the info table as json
print(json.stringify(response,true))