-- This is released into the public domain.
-- No warranty is provided, implied or otherwise.

-- confboot.lua : VM configuration program
-- Authors: 20kdc

-- _MMstartVM(name)
-- _MMcomList(...)
-- _MMserial(str)
-- _MMdeserial(str)
local screen = component.proxy(component.list("screen", true)())
local gpu = component.proxy(component.list("gpu", true)())
local fs = component.proxy("world")

screen.turnOn()
gpu.bind(screen.address)
gpu.setResolution(50, 15)
gpu.setForeground(0)
gpu.setBackground(0xFFFFFF)

local menu
local currentY

local currentVMId
local currentVM

local genMainMenu, genFSSelector, genEditor

function genFSSelector(cb)
 local fsName = ""
 menu = {
  {" - Select VFS -", function () end},
  {"Cancel", cb},
  {"New FS: ", function ()
   fs.makeDirectory("fs-" .. fsName)
   genFSSelector(cb)
  end, function (text)
   if text then fsName = text end
   return fsName
  end}
 }
 currentY = 2
 local fsl = fs.list("")
 table.sort(fsl)
 for k, v in ipairs(fsl) do
  if v:sub(#v) == "/" and v:sub(1, 3) == "fs-" then
   local id = v:sub(4, #v - 1)
   table.insert(menu, {id, function ()
    cb(id)
   end})
   table.insert(menu, {" Delete", function ()
    fs.remove("fs-" .. id)
    genFSSelector(cb)
   end})
  end
 end
end

local function doVMSave()
 local f = fs.open("vm-" .. currentVMId, "wb")
 if not f then error("VM Save failed...") end
 fs.write(f, _MMserial(currentVM))
 fs.close(f)
end

function genEditor()
 menu = {
--01234567890123456789012345678901234567890123456789
  {" - configuring VM: " .. currentVMId, function () end},
  {"Save & Return", function ()
   doVMSave()
   currentVM, currentVMId = nil
   genMainMenu()
  end},
  {"Save & Launch", function ()
   doVMSave()
   _MMstartVM(currentVMId)
   computer.shutdown()
  end},
  {"Delete", function ()
   fs.remove("vm-" .. currentVMId)
   currentVM, currentVMId = nil
   genMainMenu()
  end},
 } 
 currentY = 3
 for k, v in pairs(currentVM) do
  local v1 = tostring(v)
  if type(v) ~= "string" then
   v1 = "virt. ".. v[1]
  end
  table.insert(menu, {"Del. " .. v1 .. " " .. k, function ()
   currentVM[k] = nil
   genEditor()
  end})
 end
 if not currentVM["k-eeprom"] then
  table.insert(menu, {"+ Virtual EEPROM (R/W, preloaded w/ LUCcABOOT)...", function ()
   currentVM[currentVMId .. "-eeprom"] = {"eeprom", "/vc-" .. currentVMId .. ".lua", "/vd-" .. currentVMId .. ".bin", "VM BIOS", false}
   genEditor()
   -- do file copy now!
   local handleA = fs.open("/lucaboot.lua", "rb")
   local handleB = fs.open("/vc-" .. currentVMId .. ".lua", "wb")
   if not handleA then if handleB then fs.close(handleB) end return end
   if not handleB then fs.close(handleA) return end
   while true do
    local s = fs.read(handleA, 2048)
    if not s then break end
    fs.write(handleB, s)
   end
   fs.close(handleA)
   fs.close(handleB)
  end})
 end
 table.insert(menu, {"+ Virtual FS (R/W)...", function ()
  genFSSelector(function (fsa)
   if fsa then
    currentVM["fs-" .. fsa] = {"filesystem", "/fs-" .. fsa .. "/", false}
   end
   genEditor()
  end)
 end})
 table.insert(menu, {"+ Virtual FS (R/O)...", function ()
  genFSSelector(function (fsa)
   if fsa then
    currentVM[fsa .. "-fs"] = {"filesystem", fsa, true}
   end
   genEditor()
  end)
 end})
 local tx = {
  "+ Screen 50x15:",
  "+ Screen 80x24:",
  "+ Screen 160x49:"
 }
 local txw = {
  50,
  80,
  160
 }
 local txh = {
  15,
  24,
  49
 }
 for i = 1, 3 do
  local cName = currentVMId .. "-screen"
  local nt = 0
  while currentVM[cName] do
   nt = nt + 1
   cName = currentVMId .. "-" .. nt
  end
  table.insert(menu, {tx[i], function ()
   currentVM[cName] = {"screen", cName, txw[i], txh[i], 8}
   genEditor()
  end, function (text)
   if text then cName = text end
   return cName
  end})
 end
 for address, ty in _MMcomList("") do
  if (not currentVM[address]) and ty ~= "gpu" then
   table.insert(menu, {"+ Host " .. ty .. " " .. address, function ()
    currentVM[address] = ty
    genEditor()
   end})
  end
 end
end

function genMainMenu()
 local vmName = ""
 menu = {
--01234567890123456789012345678901234567890123456789
  {" - metamachine configurator -- use keyboard -   ", function () end},
  {"Shutdown", computer.shutdown},
  {"New VM: ", function ()
   local f = fs.open("vm-" .. vmName, "wb")
   if not f then return end
   fs.write(f, _MMserial({
    [vmName .. "-eeprom"] = {"eeprom", "/lucaboot.lua", "/vd-" .. vmName .. ".bin", "LUCcABOOT VM BIOS", true},
    [vmName .. "-screen"] = {"screen", vmName, 50, 15, 8}
   }))
   fs.close(f)
   genMainMenu()
  end, function (text)
   if text then vmName = text end
   return vmName
  end}
 }
 currentY = 3
 local fsl = fs.list("")
 table.sort(fsl)
 for k, v in ipairs(fsl) do
  if v:sub(#v) == "/" then
  elseif v:sub(1, 3) == "vm-" then
   local id = v:sub(4)
   table.insert(menu, #menu, {id, function ()
    local f = fs.open("vm-" .. id, "rb")
    if not f then return end
    local str = ""
    while true do
     local sb = fs.read(f, 2048)
     if not sb then break end
     str = str .. sb
    end
    currentVM = _MMdeserial(str) or {}
    fs.close(f)
    currentVMId = id
    genEditor()
   end})
  end
 end
end

----

genMainMenu()

local function draw()
 gpu.fill(1, 1, 50, 15, " ")
 local camera = math.max(0, math.min(math.floor(currentY - 7), #menu - 15))
 for i = 1, #menu do
  local pfx = "  "
  if currentY == i then
   pfx = "> "
  end
  local pox = ""
  if menu[i][3] then
   pox = menu[i][3]()
  end
  gpu.set(1, i - camera, pfx .. menu[i][1] .. pox)
 end
end

-- Final main loop.
draw()
while true do
 local t = {computer.pullSignal()}
 if t[1] == "key_down" then
  if t[4] == 200 then
   currentY = math.max(1, currentY - 1)
   draw()
  elseif t[4] == 208 then
   currentY = math.min(currentY + 1, #menu)
   draw()
  elseif t[3] == 13 then
   menu[currentY][2]()
   draw()
  elseif t[3] == 8 then
   local tx = menu[currentY][3]()
   menu[currentY][3](unicode.sub(tx, 1, unicode.len(tx) - 1))
   draw()
  elseif t[3] >= 32 then
   if menu[currentY][3] then
    menu[currentY][3](menu[currentY][3]() .. unicode.char(t[3]))
    draw()
   end
  end
 end
end