-- 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.

-- lucaboot.lua : Fake EEPROM for VM.
-- Authors: 20kdc

-- LUCcABOOT v0
-- awful name I know

local eprox = component.proxy(component.list("eeprom", true)())
computer.getBootAddress = eprox.getData
computer.setBootAddress = eprox.setData
eprox = nil

local logo = {
 "               ⣀▄⣀               ",
 "           ⣀▄⠶▀⠉ ⠉█⠶▄⣀           ",
 "       ⣀▄⠶▀⠉     ◢◤  ⠉▀⠶▄⣀       ",
 "   ⣀▄⠶▀⠉        ◢◤       ⠉▀⠶▄⣀   ",
 " ◢⠿⣭⣀      meta ◯ machine   ⣀⣭⠿◣ ",
 " █  ⠉▀⠶▄⣀      ◢◤       ⣀▄⠶▀⠉  █ ",
 " █      ⠉▀⠶▄⣀ ◢◤    ⣀▄⠶▀⠉  ⣀▄⠶ █ ",
 " █⣀         ⠉▀⠿▄▄▄⠶▀⠉      ⠉  ⣀█ ",
 "  ⠉▀⠶▄⣀         █         ⣀▄⠶▀⠉  ",
 "      ⠉▀⠶▄⣀     █     ⣀▄⠶▀⠉      ",
 "          ⠉▀⠶▄⣀ █ ⣀▄⠶▀⠉          ",
 "              ⠉▀▀▀⠉              ", -- 12
 "  metamachine virtual computing  ",
 " Press F3 to enter boot manager. ",
 "                                 "
}
local gpuA = component.list("gpu", true)()
local screenA = component.list("screen", true)()
local bootManager = false
if gpuA and screenA then
 local gpuP = component.proxy(gpuA)
 gpuP.bind(screenA)
 gpuP.setResolution(33, 15)
 local targetUptime = computer.uptime()
 for j = 0, 10 do
  targetUptime = targetUptime + 0.1
  local ej = j
  if j > 5 then
   -- 5 * 50 = 250
   ej = 5 - (j - 5)
   ej = ej * 50
  elseif j == 5 then
   targetUptime = targetUptime + 4
   ej = 255
  else
   ej = ej * 50
  end
  gpuP.setForeground(ej + (ej * 0x100) + (ej * 0x10000))
  gpuP.setBackground(0)
  for i = 1, #logo do
   gpuP.set(1, i, logo[i])
  end
  while true do
   local tl = targetUptime - computer.uptime()
   if tl <= 0.01 then break end
   local v = {computer.pullSignal(tl)}
   if v[1] == "key_down" then
    if v[4] == 61 then
     -- boot manager
     bootManager = true
     logo[14] = "  - Entering boot manager now. -  "
     break
    end
   end
  end
 end
 gpuP.setForeground(0xFFFFFF)
 gpuP.setBackground(0)
 local selY = 1
 while bootManager do
  gpuP.fill(1, 1, 33, 15, " ")
  local y = 1
  local mapping = {}
  for a in component.list("filesystem", true) do
   local pfx = " "
   if selY == y then
    pfx = ">"
   end
   if computer.getBootAddress() == a then
    pfx = pfx .. "*"
   else
    pfx = pfx .. " "
   end
   mapping[y] = a
   gpuP.set(1, y, pfx .. a .. ":" .. (component.invoke(a, "getLabel") or ""))
   y = y + 1
  end
  while true do
   local v = {computer.pullSignal()}
   if v[1] == "key_down" then
    if v[4] == 200 then
     selY = math.max(1, selY - 1)
     break
    elseif v[4] == 208 then
     selY = math.min(selY + 1, y - 1)
     break
    elseif v[3] == 13 then
     computer.setBootAddress(mapping[selY] or "")
     bootManager = nil
     break
    end
   end
  end
 end
end
local lr = "(no inits)"
local function boot(fsa)
 local dat = component.proxy(fsa)
 local fh = dat.open("/init.lua", "rb")
 if fh then
  local ttl = ""
  while true do
   local chk = dat.read(fh, 2048)
   if not chk then break end
   ttl = ttl .. chk
  end
  local fn, r = load(ttl, "=init.lua", "t")
  if not fn then
   lr = r
   dat.close(fh)
  else
   dat.close(fh)
   computer.setBootAddress(fsa)
   fn()
   error("Returned from init")
  end
 end
end
if component.type(computer.getBootAddress()) then
 boot(computer.getBootAddress())
end
for a in component.list("filesystem", true) do
 boot(a)
end
error("No available operating systems. " .. lr)