-- (c) ProgramCrafter
-- Program that shows different banners.

local s = require('serialization')
local cmp = require('computer')
local c = require('component')
local e = require('event')

local time_change = 60
local banners = {...}
local loaded_banners = {}

if tonumber(banners[1]) then
    time_change = tonumber(banners[1])
    table.remove(banners, 1)
elseif not banners[1] then
    banners[1] = '/tmp/last_banner.dat'
end

local banners_count = #banners
local cur_banner = 1
local banner_path = banners[cur_banner]

if banners_count == 1 then time_change = math.huge end

local colors = {
    0x0000FF, 0x00FFFF, 0x00FF00, 0xFFFF00, 0xFF0000, 0xFF00FF,
    0x000000, 0x333333, 0x666666, 0x999999, 0xAAAAAA, 0xFFFFFF
}


local gpu = c.gpu
local w,h = gpu.getResolution()

local function changeColors(fcol, bcol)
    return gpu.setForeground(fcol), gpu.setBackground(bcol)
end
local function drawText(x, y, fcol, bcol, txt)
    fcol, bcol = changeColors(fcol, bcol)
    gpu.set(x, y, txt)
    changeColors(fcol, bcol)
end
local function clearScreen()
    gpu.fill(1, 1, w, h, ' ')
end

local messages = {}

local function drawMessage(msg)
    drawText(msg.x, msg.y, colors[msg.fcol or 1], colors[msg.bcol or 1], msg.text)
end
local function drawMessages()
    for _,v in pairs(messages) do drawMessage(v) end
end
local function loadMessages()
    if loaded_banners[banner_path] then
        messages = loaded_banners[banner_path]
    else
        local f = io.open(banner_path, 'r')
        if not f then return end
        messages = s.unserialize(f:read())
        f:close()
    end

    if messages.back.w then w = messages.back.w end
    if messages.back.h then h = messages.back.h end
    gpu.setResolution(w, h)
    gpu.setBackground(colors[messages.back.backcolor or 1])

    loaded_banners[banner_path] = messages
end

loadMessages()
clearScreen()
drawMessages()
while true do
    local e = {e.pull(time_change, 'interrupted')}
    if e[1] == 'interrupted' then break end

    cur_banner = cur_banner + 1
    while cur_banner > banners_count do
        cur_banner = cur_banner - banners_count
    end
    banner_path = banners[cur_banner]

    loadMessages()
    clearScreen()
    drawMessages()
end
gpu.setForeground(0xFFFFFF)
gpu.setBackground(0)
gpu.setResolution(40, 16)
clearScreen()