local config = require "config"
local permset = require "permset"
local listview = require "listview"
local winhlp = require "winhlp"

-- list of allowed item names, will be requested
local allowed_items = permset.new(".allowed_items")

local main_me = {}
if config.has_me then
    main_me = peripheral.wrap(config.main_system_ae_bridge_side)
end

local colony = peripheral.wrap(config.colony_interface_side)

local frame = term.current()

local function setTerm(termlike)
    frame = termlike
    listview.setTerm(frame)
end

local function fetch(wait_for)
    local reqs = colony.getRequests()
    local me_items = nil
    if config.has_me then
        me_items = main_me.listItems()
    end
    local currentIdx = 1
    for i, req in pairs(reqs) do
        local found = false
        if me_items then
            local left_amount = req.count
            for j, it in pairs(req.items) do
                for k, have_it in pairs(me_items) do
                    -- TODO: check NBT
                    if have_it.name == it.name then
                        found = true
                        listview.updateItemAt(currentIdx, {req=req, answer=have_it})
                        currentIdx = currentIdx + 1
                        if left_amount > 0 and permset.has(allowed_items, it.name) then
                            local export_amount = math.min(have_it.amount, left_amount)
                            left_amount = left_amount - export_amount
                            main_me.exportItem({name=it.name, count=export_amount}, config.main_me_inventory_side)
                        end
                    end
                end
            end
        end
        if found == false then
            listview.updateItemAt(currentIdx, {req=req, answer=nil})
            currentIdx = currentIdx + 1
        end
        wait_for(config.step_sleep_time)
    end
    listview.clearFrom(currentIdx)
end

local function drawLine(termlike, obj)
    termlike.setBackgroundColor(colors.black)
    termlike.setTextColor(colors.white)
    termlike.write(obj.req.name)
    termlike.write("  ")
    if obj.answer == nil then
        termlike.setTextColor(colors.orange)
        local padding = winhlp.alignRight(termlike, 5)
        termlike.write(string.format("%" .. padding+5 .. "s", " N/A "))
    else
        if permset.has(allowed_items, obj.answer.name) then
            termlike.setTextColor(colors.green)
        else
            termlike.setTextColor(colors.yellow)
        end
        termlike.write(obj.answer.name)
        termlike.setTextColor(colors.white)
        local padding = winhlp.alignRight(termlike, 5)
        termlike.write(string.format("%" .. padding+2 .. "s", " ["))
        if permset.has(allowed_items, obj.answer.name) then
            termlike.setTextColor(colors.green)
            termlike.write("X")
            termlike.setTextColor(colors.white)
        else
            termlike.write(" ")
        end
        termlike.write("] ")
    end
end
listview.setDrawLineFunc(drawLine)

local function displayTab(self)
    listview.updatePage(self.scrollPos)
end

local function onTouch(self, touch_x, touch_y)
    local tw, th = self.window.getSize()
    if touch_x > tw-5 then
        local obj = listview.itemAt(touch_y)
        if obj ~= nil and obj.answer ~= nil then
            if permset.has(allowed_items, obj.answer.name) then
                permset.remove(allowed_items, obj.answer.name)
            else
                permset.add(allowed_items, obj.answer.name)
            end
            listview.updatePartial(function (item) return item.answer ~= nil and item.answer.name == obj.answer.name end)
            return true
        end
    end
    return false
end


return {
    name="requests",
    setTerm=setTerm,
    fetch=fetch,
    displayTab=displayTab,
    onTouch=onTouch,
}