#!/usr/bin/lua

local uci = require('simple-uci').cursor()
local site = require 'gluon.site'
local util = require 'gluon.util'
local wireless = require 'gluon.wireless'
local sysconfig = require 'gluon.sysconfig'
local util = require 'gluon.util'
local olsrd = require 'gluon.olsrd'

-- Utils

function printf(...)
	print(string.format(...))
end

-- Print contents of `tbl`, with indentation.
-- `indent` sets the initial level of indentation.
-- src https://gist.github.com/xytis/5361405
function tprint (tbl, indent)
  if not indent then indent = 0 end
  for k, v in pairs(tbl) do
    formatting = string.rep('  ', indent) .. k .. ': '
    if type(v) == 'table' then
      print(formatting)
      tprint(v, indent + 1)
    else
      print(formatting .. tostring(v))
    end
  end
end

-- src https://stackoverflow.com/a/24823383/3990041
function table.slice(tbl, first, last, step)
  local sliced = {}

  for i = first or 1, last or #tbl, step or 1 do
    sliced[#sliced+1] = tbl[i]
  end

  return sliced
end

-- CLI lib

function exec_cmd(args, sub)
	if sub[args[1]] == nil then
		return cmd_err('does not exist')
	else
		local cmd = sub[args[1]]
		if cmd[3] ~= nil and #args > 1 then
			exec_cmd(table.slice(args, 2), cmd[3])
		else
			cmd[1](unpack(table.slice(args, 2)))
		end
	end
end

function list_cmd(level, sub)
	for key, cmd in pairs(sub) do
		printf('%s%s: %s', string.rep('  ', level), key, cmd[2])
		if cmd[3] ~= nil then
			list_cmd(level + 1, cmd[3])
		end
	end
end

function show_help()
	printf('Usage: %s <command>', arg[0])
	list_cmd(1, sub)
end

function cmd_err(msg, no_show_help)
	-- since argv0 is at... well... 0... even though this is lua...
	--- ...slice just returns arg without argv0 as the for starts at 1
	printf('Error: Command "%s" %s', table.concat(table.slice(arg), ' '), msg)
	if not no_show_help then
		printf('')
		show_help()
	end
	os.exit(2)
end

function dummy()
	cmd_err('requires a subcommand')
end

-- our stuff

function show_info()
	local info = olsrd.oi()
	tprint(info)
end

function olsr1_nodeinfo(...)
	if #{ ... } == 0 then
		return cmd_err('requires at least one argument (example: "all")', true)
	end

	local query = table.concat({ ... }, '/')
	local res = olsrd.olsr1_get_nodeinfo(query)
	tprint(res)
end

function olsr2_nodeinfo_raw(...)
	if #{ ... } == 0 then
		return cmd_err('requires at least one argument (example: "nhdpinfo link")', true)
	end

	local query = table.concat({ ... }, ' ')
	local res = olsrd.olsr2_get_nodeinfo_raw(query)
	print(res)
end

function olsr2_nodeinfo_json(...)
	if #{ ... } == 0 then
		return cmd_err('requires at least one argument (example: "nhdpinfo jsonraw link")', true)
	end

	local query = table.concat({ ... }, ' ')
	local res = olsrd.olsr2_get_nodeinfo(query)
	tprint(res)
end

function olsr1_neigh()
	return olsr1_nodeinfo('links')
end

function olsr2_neigh()
	return olsr2_nodeinfo('nhdpinfo jsonraw link')
end

sub = {
	info = { show_info, 'Show information about status of olsr1 and olsr2' },
	help = { show_help, 'Show help' },
	olsr1 = { dummy, 'OLSRv1 Control Commands', {
		nodeinfo = { olsr1_nodeinfo, 'OLSRv1 Nodeinfo' },
		neigh = { olsr1_neigh, 'OLSRv1 Neighbour List' },
	}	},
	olsr2 = { dummy, 'OLSRv2 Control Commands', {
		nodeinfo = { dummy, 'OLSRv2 Nodeinfo', {
			raw = { olsr2_nodeinfo_raw, 'OLSRv2 Nodeinfo Raw' },
			json = { olsr2_nodeinfo_json, 'OLSRv2 Nodeinfo JSON' }
		} },
		neigh = { olsr2_neigh, 'OLSRv2 Neighbour List' },
	}	}
}

exec_cmd(table.slice(arg), sub)