local holoAPI = {}

local holow
local holoh
local h = {}

local component = require("component")
local term = require("term")

function holoAPI.setHolo(hn, hwidth)
  h = {}
  for _, addr in ipairs(hn) do
    local realAddr = component.get(addr)
    table.insert(h, component.proxy(realAddr))
  end

  holow = hwidth
  holoh = (#hn)/holow
end

function holoAPI.holoClean()
  for i = 1 , #h do
    h[i].clear()
  end
end

function holoAPI.holoSetPat(pat)
  for i = 1, #h do
    for j = 1, 3 do
      h[i].setPaletteColor(j, pat[j])
    end
    term.clear()
    term.setCursor(12,1)
    term.write('processing..' .. math.floor(#h/i)*100 .. '%')
    os.sleep()
  end
end

function holoAPI.holoCleanWithPat(pat)
  for i = 1, #h do
    h[i].clear()
    for j = 1, 3 do
      h[i].setPaletteColor(j, pat[j])
    end
    os.sleep()
  end
end

function holoAPI.draw( x, y, z, c)
  local modx = 48-math.fmod(x-1,48)
  local mody = 32-math.fmod(y-1,32)

  local hx   = math.floor((x-1)/48)+1
  local hy   = math.floor((y-1)/32)

  h[hy*holow+hx].set(modx, mody, z, c)
end


function holoAPI.showpic(fileName)
  local img = require( fileName )
  os.sleep()
  holoAPI.holoCleanWithPat( img.pat )
  term.clear()
  local offx = math.floor((holow*48-img.x)/2)
  local offy = math.floor((holoh*32-img.y)/2)
  for y=1, img.y do
    for x=1,img.x do
      holoAPI.draw(x+offx,y+offy,1,img.img[((y-1)*img.x+x)])
    end
  end

  local sx = math.floor((50-#img.subtitle/3*2)/2) + 1
  term.clear()
  term.setCursor(sx, 1)
  term.write(img.subtitle)
end

return holoAPI