local component = require("component")
local internet = require("internet")
local sides = require("sides")
local robot = require("robot")

-- from: http://regex.info/code/JSON.lua
JSON = (loadfile "JSON.lua")()

local chat_id = "XXXXXXXXX"
local token = "XXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
local method = "sendMessage"
local url = "https://api.telegram.org/bot" .. token .. "/" .. method

local row_width = 12
local slot = 2
local ic = component.inventory_controller
local data_table = {}
local running = true

local function get_drawer_data(side)
  local slot_data = ic.getStackInSlot(side, slot)
  if slot_data then
    local item_data = {}
    item_data.name = slot_data.name
    item_data.label = slot_data.label
    item_data.size = slot_data.size
    
    data_table[slot_data.name] = item_data
  end
end

local function right() 
  robot.turnRight();
  robot.forward();
  robot.turnLeft();
end

local function left() 
  robot.turnLeft();
  robot.forward();
  robot.turnRight();
end

local function scan_row(direction, times, fn)
  local mf = nil
  if direction == sides.left then
    mf = left
  elseif direction == sides.right then 
    mf = right
  end
  
  for i=0,times-1 do 
    fn()
    mf()
  end
end

local function form_report()
  local outcome = "Report on " .. os.date() .. "@MLC (Minecraft Local Time)"
  for k,v in pairs(data_table) do
    outcome = outcome .. "\n" .. v.label .. " - " .. v.size
  end
  outcome = outcome .. "\n\nNext update in 1 hour"
  return outcome
end

local function send_data(data)  
  local j_data = {}
  j_data.chat_id = chat_id
  j_data.text = data
  
  local r_headers = {}
  r_headers["Content-Type"] = "application/json"

  local raw_json_text = JSON:encode(j_data)
  local handle = internet.request(url, raw_json_text, r_headers, "POST")
end

local function main()
  local iterations = 0
  while running do
    print("Iteraion", iterations)
    iterations = iterations + 1
    
    scan_row(sides.right, row_width, function() get_drawer_data(sides.front) end)
    robot.up()
    scan_row(sides.left, row_width, function() get_drawer_data(sides.front) end)
    robot.up()
    scan_row(sides.right, row_width, function() get_drawer_data(sides.front) end)
    robot.up()
    scan_row(sides.left, row_width, function() get_drawer_data(sides.front) end)
    robot.down()
    robot.down()
    robot.down()
    
    local report = form_report()
    send_data(report)
    print("Sleeping for 1 hour...")
    os.sleep(60 * 60)
    data_table = {}
  end
end

main()