-- Copyright (C) 2018-2021 by KittenOS NEO contributors
--
-- Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
--
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
-- THIS SOFTWARE.

return function (
 gpus, screens,
 getMonitorSettings, settings, sRattle, saveSettings,
 announceFreeMonitor, pid, claimed, sendSig,
 monitorClaims, monitorPool, currentGPUUsers, currentGPUBinding,
 address
)
 neo.ensureType(address, "string")
 for k, monitor in ipairs(monitorPool) do
  if monitor.address == address then
   -- find GPU
   local gpu, bestStats = nil, {-math.huge, -math.huge, -math.huge}
   for a, _ in pairs(currentGPUBinding) do
    currentGPUBinding[a] = nil
   end
   for v in gpus() do
    v.bind(monitor.address, false)
    local w, h = v.maxResolution()
    local quality = w * h * v.maxDepth()
    local users = (currentGPUUsers[v.address] or 0)
    local gquality = 0
    for scr in screens() do
     v.bind(scr.address, false)
     w, h = v.maxResolution()
     local squality = w * h * v.maxDepth()
     gquality = math.max(gquality, squality)
    end
    local stats = {quality, -users, -gquality}
    for i = 1, #stats do
     if stats[i] > bestStats[i] then
      gpu = v
      bestStats = stats
      break
     elseif stats[i] < bestStats[i] then
      break
     end
    end
   end
   -- setup monitor
   if gpu then
    monitor.setPrecise(true)
    monitor.turnOn()
    gpu.bind(address, false)
    currentGPUBinding[gpu.address] = address
    local maxW, maxH = gpu.maxResolution()
    local maxD = gpu.maxDepth()
    local w, h, d, t = getMonitorSettings(address)
    w, h, d = math.min(w, maxW), math.min(h, maxH), math.min(d, maxD)
    if monitor.setTouchModeInverted then
     monitor.setTouchModeInverted(t == "yes")
    else
     t = "no"
    end
    settings["scr.w." .. monitor.address] = tostring(w)
    settings["scr.h." .. monitor.address] = tostring(h)
    settings["scr.d." .. monitor.address] = tostring(d)
    settings["scr.t." .. monitor.address] = t
    sRattle("scr.w." .. monitor.address, tostring(w))
    sRattle("scr.h." .. monitor.address, tostring(h))
    sRattle("scr.d." .. monitor.address, tostring(d))
    sRattle("scr.t." .. monitor.address, t)
    gpu.setResolution(w, h)
    gpu.setDepth(d)
    pcall(saveSettings)
    -- finish up
    gpu = gpu.address
    currentGPUUsers[gpu] = (currentGPUUsers[gpu] or 0) + 1
    local disclaimer = function (wasDevLoss)
     -- we lost it
     monitorClaims[address] = nil
     claimed[address] = nil
     if not wasDevLoss then
      currentGPUUsers[gpu] = currentGPUUsers[gpu] - 1
      table.insert(monitorPool, monitor)
      announceFreeMonitor(address, pid)
     else
      sendSig("lost", address)
     end
    end
    claimed[address] = disclaimer
    monitorClaims[address] = {gpu, disclaimer}
    table.remove(monitorPool, k)
    return function ()
     for v in gpus() do
      if v.address == gpu then
       local didBind = false
       if currentGPUBinding[gpu] ~= address then
        v.bind(address, false)
        didBind = true
       end
       currentGPUBinding[gpu] = address
       return v, didBind
      end
     end
    end, monitor
   end
  end
 end
end