-- ui.lua  (run on your UI-side computer)

-- ========================================================
-- Peripheral wrapping
-- ========================================================
rednet.open("left")
local monitor = assert(peripheral.wrap("back"), "Monitor not found")

-- ========================================================
-- Formatting
-- ========================================================
local function formatK(val)
  if not val then return "-" end
  if val >= 1000 then
    return string.format("%dk", math.floor(val/1000))
  else
    return tostring(val)
  end
end

local function formatTimeTicks(ticks)
  if not ticks or ticks == "-" or ticks == math.huge then return "-" end
  local seconds = math.floor(ticks/20 + 0.5)
  local h = math.floor(seconds/3600)
  local m = math.floor((seconds % 3600)/60)
  local s = seconds % 60
  return string.format("%02d:%02d:%02d", h, m, s)
end

-- ========================================================
-- Monitor UI (main, with percentage thresholds)
-- ========================================================
local function monitorUI(data)
  monitor.setBackgroundColor(colors.black)
  monitor.clear()
  monitor.setTextScale(1)

  local w, _ = monitor.getSize()

  -- top line: accumulator % on left, ON/OFF on right
  monitor.setCursorPos(1, 1)
  monitor.setTextColor(colors.white)
  monitor.write(string.format("Accumulator: %.1f%%", data.accPct))
  monitor.setCursorPos(w - 2, 1)
  monitor.setTextColor(data.generatorOn and colors.lime or colors.red)
  monitor.write(data.generatorOn and "ON" or "OFF")

  -- rate & ETA
  monitor.setCursorPos(1, 3)
  monitor.setTextColor(colors.white)
  monitor.write("Rate: " .. tostring(math.floor(data.avgFEperTick + 0.5)) .. " FE/t")
  monitor.setCursorPos(1, 4)
  monitor.write(data.etaLabel .. " " .. formatTimeTicks(data.etaTicks))

  -- thresholds as percentages
  local minPct = data.minEnergy / data.totalCapacity * 100
  local maxPct = data.maxEnergy / data.totalCapacity * 100
  monitor.setCursorPos(1, 6)
  monitor.setTextColor(colors.lightGray)
  monitor.write(string.format(
    "Thresholds: Min: %.1f%%   Max: %.1f%%",
    minPct, maxPct
  ))

  -- battery banks
  local y = 8
  monitor.setTextColor(colors.lightGray)
  monitor.setCursorPos(1, y)
  monitor.write(string.format("Bank 0: %s/%s", formatK(data.accEnergy),  formatK(data.accCapacity)))
  monitor.setCursorPos(1, y + 1)
  monitor.write(string.format("Bank 1: %s/%s", formatK(data.acc0Energy), formatK(data.acc0Capacity)))
  monitor.setCursorPos(1, y + 2)
  monitor.write(string.format("Bank 2: %s/%s", formatK(data.acc1Energy), formatK(data.acc1Capacity)))
  monitor.setCursorPos(1, y + 3)
  monitor.write(string.format("Bank 3: %s/%s", formatK(data.capBankEnergy), formatK(data.capBankCap)))
end

-- ========================================================
-- Receive & render loop
-- ========================================================
while true do
  local _, data = rednet.receive("generator_status")
  monitorUI(data)
end