local config = require "config"

-- index of current tab
local current_tab = config.initial_tab
-- display working state
local currently_working = true
-- current start index to view requests
local page_start_idx = 1
-- schedule immediate reload
local immediate_reload = false

local tabs = {
    -- to display requests and answer with an ME interface
    [1]=require "requests",
    -- to display colony work orders
    [2]=require "orders",
}


local function display()
    local tw,th = term.getSize()
    term.setCursorBlink(false)
    term.setBackgroundColor(colors.black)
    term.clear()

    term.setCursorPos(1,1)
    term.setBackgroundColor(colors.yellow)
    term.setTextColor(colors.black)
    term.clearLine()

    term.write(" " .. string.upper(tabs[current_tab].name) .. " ")
    if currently_working == false then
        term.setCursorPos(tw-8,1)
        term.write(" R ")
    end
    term.setCursorPos(tw-5,1)
    term.write(" ^  v ")
    term.setBackgroundColor(colors.black)

    tabs[current_tab].display(page_start_idx)

    if currently_working then
        local cx,cy = term.getCursorPos()
        term.setCursorPos(1,cy+2)
        term.setCursorBlink(true)
        term.setTextColor(colors.gray)
        term.write("Working... ")
    end
end


local function page_down(th)
    page_start_idx = page_start_idx+th-3
end


local function page_up(th)
    page_start_idx = math.max(1, page_start_idx-th+3)
end


local function on_touch(touch_x, touch_y)
    local tw,th = term.getSize()
    if touch_y == 1 then
        if touch_x < (#tabs[current_tab].name + 2) then
            current_tab = current_tab + 1
            if current_tab > #tabs then
                current_tab = 1
            end
            return true
        elseif currently_working == false and touch_x > tw-9 and touch_x < tw-5 then
            -- reload button
            immediate_reload = true
            return true
        elseif touch_x > tw-6 and touch_x < tw-2 then
            page_up(th)
            return true
        elseif touch_x > tw-3 and touch_x <= tw then
            page_down(th) 
            return true
        end
    elseif tabs[current_tab].on_touch(touch_x, touch_y) then
        return true
    end
    return false
end


local function wait_for(time_secs)
    display()
    local timer_id = os.startTimer(time_secs)
    while true do
        local event_data = {os.pullEvent()}
        if event_data[1] == "monitor_touch" or (event_data[1] == "mouse_click" and event_data[2] == 1) then
            if on_touch(event_data[3], event_data[4]) then
                display()
            end
            if immediate_reload == true then
                os.cancelTimer(timer_id)
                immediate_reload = false
                break
            end
        elseif event_data[1] == "timer" then
            if event_data[2] == timer_id then
                break
            end
        end
    end
end


if peripheral.isPresent(config.monitor_side) then
    monitor = peripheral.wrap(config.monitor_side)
    monitor.setTextScale(config.monitor_scale)
    term.redirect(monitor)
end

while true do
    currently_working = true
    for i, tab in pairs(tabs) do
        tab.fetch(wait_for)
    end
    currently_working = false
    wait_for(config.round_sleep_time)
end