local Config = require('config')
local Craft  = require('turtle.craft')
local itemDB = require('itemDB')
local Util   = require('util')

local os     = _G.os
local term   = _G.term
local turtle = _G.turtle

local Milo = {
	RECIPES_FILE  = 'usr/config/recipes.db',
	RESOURCE_FILE = 'usr/config/resources.db',

	STATUS_INFO    = 'info',
	STATUS_WARNING = 'warning',
	STATUS_ERROR   = 'error',

	tasks = { },
	craftingStatus = { },
}

function Milo:init(context)
	self.context = context
end

function Milo:getContext()
	return self.context
end

function Milo:pauseCrafting()
	self.craftingPaused = true
	Milo:showError('Crafting Paused')
end

function Milo:resumeCrafting()
	self.craftingPaused = false
end

function Milo:isCraftingPaused()
	return self.craftingPaused
end

function Milo:getState(key)
	if not self.state then
		self.state = { }
		Config.load('milo.state', self.state)
	end
	return self.state[key]
end

function Milo:setState(key, value)
	if not self.state then
		self.state = { }
		Config.load('milo.state', self.state)
	end
	self.state[key] = value
	Config.update('milo.state', self.state)
end

function Milo:uniqueKey(item)
	return table.concat({ item.name, item.damage, item.nbtHash }, ':')
end

function Milo:getCraftingStatus()
	return self.craftingStatus
end

function Milo:resetCraftingStatus()
	self.craftingStatus = { }
	self.context.inventoryAdapter.activity = { }
end

function Milo:updateCraftingStatus(list)
	for k,v in pairs(list) do
		self.craftingStatus[k] = v
	end
end

function Milo:registerTask(task)
	table.insert(self.tasks, task)
end

function Milo:showError(msg)
	--term.clear()
	self.context.jobList:showError(msg)
	--print(msg)
	--print('rebooting in 5 secs')
	--os.sleep(5)
	--os.reboot()
end

function Milo:getItem(items, inItem, ignoreDamage, ignoreNbtHash)
	for _,item in pairs(items) do
		if item.name == inItem.name and
			(ignoreDamage or item.damage == inItem.damage) and
			(ignoreNbtHash or item.nbtHash == inItem.nbtHash) then
			return item
		end
	end
end

function Milo:getItemWithQty(res, ignoreDamage, ignoreNbtHash)
	local items = self:listItems()
	local item = self:getItem(items, res, ignoreDamage, ignoreNbtHash)

	if item and (ignoreDamage or ignoreNbtHash) then
		local count = 0

		for _,v in pairs(items) do
			if item.name == v.name and
				(ignoreDamage or item.damage == v.damage) and
				(ignoreNbtHash or item.nbtHash == v.nbtHash) then
				count = count + v.count
			end
		end
		item.count = count
	end

	return item
end

function Milo:clearGrid()
	local function clear()
		turtle.eachFilledSlot(function(slot)
			self.context.inventoryAdapter:insert(slot.index, slot.count, nil, slot)
		end)

		for i = 1, 16 do
			if turtle.getItemCount(i) ~= 0 then
				return false
			end
		end
		return true
	end
	return clear() or clear()
end

function Milo:eject(item, qty)
	local s, m = pcall(function()
		self.context.inventoryAdapter:provide(item, qty)
		turtle.emptyInventory()
	end)
	if not s and m then
		debug(m)
	end
end

function Milo:mergeResources(t)
	for _,v in pairs(self.context.resources) do
		local item = self:getItem(t, v)
		if item then
			Util.merge(item, v)
		else
			item = Util.shallowCopy(v)
			item.count = 0
			table.insert(t, item)
		end
	end

	for k in pairs(Craft.recipes) do
		local v = itemDB:splitKey(k)
		local item = self:getItem(t, v)
		if not item then
			item = Util.shallowCopy(v)
			item.count = 0
			table.insert(t, item)
		end
		item.has_recipe = true
	end

	for _,v in pairs(t) do
		if not v.displayName then
			v.displayName = itemDB:getName(v)
		end
		v.lname = v.displayName:lower()
	end
end

function Milo:saveResources()
	local t = { }

	for k,v in pairs(self.context.resources) do
		v = Util.shallowCopy(v)
		local keys = Util.transpose({ 'auto', 'low', 'limit',
									'ignoreDamage', 'ignoreNbtHash',
									 'rsControl', 'rsDevice', 'rsSide' })

		for _,key in pairs(Util.keys(v)) do
			if not keys[key] then
				v[key] = nil
			end
		end
		if not Util.empty(v) then
			t[k] = v
		end
	end

	Util.writeTable(self.RESOURCE_FILE, t)
end

-- Return a list of everything in the system
function Milo:listItems()
	for _ = 1, 5 do
		self.items = self.context.inventoryAdapter:listItems()
		if self.items then
			break
		end
--	    jobList:showError('Error - retrying in 3 seconds')
		os.sleep(3)
	end
	if not self.items then
		self:showError('Error - rebooting in 5 seconds')
	end

	return self.items
end

function Milo:addCraftingRequest(item, craftList, count)
	local key = self:uniqueKey(item)
	local request = craftList[key]
	if not craftList[key] then
		request = { name = item.name, damage = item.damage, nbtHash = item.nbtHash, count = 0 }
		request.displayName = itemDB:getName(request)
		craftList[key] = request
	end
	request.count = request.count + count
	return request
end

-- Craft
function Milo:craftItem(recipe, items, originalItem, craftList, count)
	local missing = { }
	local toCraft = Craft.getCraftableAmount(recipe, count, items, missing)
	if missing.name then
		originalItem.status = string.format('%s missing', itemDB:getName(missing.name))
		originalItem.statusCode = self.STATUS_WARNING
	end

	local crafted = 0

	if toCraft > 0 then
		crafted = Craft.craftRecipe(recipe, toCraft, self.context.inventoryAdapter)
		self:clearGrid()
		items = self:listItems()
		count = count - crafted
	end

	if count > 0 and items then
		local ingredients = Craft.getResourceList4(recipe, items, count)
		for _,ingredient in pairs(ingredients) do
			if ingredient.need > 0 then
				local item = self:addCraftingRequest(ingredient, craftList, ingredient.need)
				if Craft.findRecipe(item) then
					item.status = string.format('%s missing', itemDB:getName(ingredient))
					item.statusCode = self.STATUS_WARNING
				else
					item.status = 'no recipe'
					item.statusCode = self.STATUS_ERROR
				end
			end
		end
	end
	return crafted
end

-- Craft as much as possible regardless if all ingredients are available
function Milo:forceCraftItem(inRecipe, items, originalItem, craftList, inCount)
	local summed = { }
	local throttle = Util.throttle()

	local function sumItems(recipe, count)
		count = math.ceil(count / recipe.count)
		local craftable = count

		for key,iqty in pairs(Craft.sumIngredients(recipe)) do
			throttle()
			local item = itemDB:splitKey(key)
			local summedItem = summed[key]
			if not summedItem then
				summedItem = Util.shallowCopy(item)
				summedItem.recipe = Craft.findRecipe(item)
				summedItem.count = Craft.getItemCount(items, key)
				summedItem.need = 0
				summedItem.used = 0
				summedItem.craftable = 0
				summed[key] = summedItem
			end

			local total = count * iqty                           -- 4 * 2
			local used = math.min(summedItem.count, total)       -- 5
			local need = total - used                            -- 3

			if recipe.craftingTools and recipe.craftingTools[key] then
				if summedItem.count > 0 then
					summedItem.used = 1
					summedItem.need = 0
					need = 0
				elseif not summedItem.recipe then
					summedItem.need = 1
					need = 1
				else
					need = 1
				end
			else
				summedItem.count = summedItem.count - used
				summedItem.used = summedItem.used + used
			end

			if need > 0 then
				if not summedItem.recipe then
					craftable = math.min(craftable, math.floor(used / iqty))
					summedItem.need = summedItem.need + need
				else
					local c = sumItems(summedItem.recipe, need) -- 4
					craftable = math.min(craftable, math.floor((used + c) / iqty))
					summedItem.craftable = summedItem.craftable + c
				end
			end
		end
		if craftable > 0 then
			craftable = Craft.craftRecipe(recipe, craftable * recipe.count,
				self.context.inventoryAdapter) / recipe.count
			self:clearGrid()
		end

		return craftable * recipe.count
	end

	local count = sumItems(inRecipe, inCount)

	if count < inCount then
		for _,ingredient in pairs(summed) do
			if ingredient.need > 0 then
				local item = self:addCraftingRequest(ingredient, craftList, ingredient.need)
				if Craft.findRecipe(item) then
					item.status = string.format('%s missing', itemDB:getName(ingredient))
					item.statusCode = self.STATUS_WARNING
				else
					item.status = '(no recipe)'
					item.statusCode = self.STATUS_ERROR
				end
			end
		end
	end
	return count
end

function Milo:craft(recipe, items, item, craftList)
	item.status = nil
	item.statusCode = nil
	item.crafted = 0

	if self:isCraftingPaused() then
		return
	end

	if not self:clearGrid() then
		item.status = 'Grid obstructed'
		item.statusCode = self.STATUS_ERROR
		return
	end

	if item.forceCrafting then
		item.crafted = self:forceCraftItem(recipe, items, item, craftList, item.count)
	else
		item.crafted = self:craftItem(recipe, items, item, craftList, item.count)
	end
end

function Milo:craftItems(craftList)
	for _,key in pairs(Util.keys(craftList)) do
		local item = craftList[key]
		if item.count > 0 then
			local recipe = Craft.recipes[key]
			if recipe then
				self:craft(recipe, self:listItems(), item, craftList)
			elseif not self.context.controllerAdapter then
				item.status = '(no recipe)'
				item.statusCode = self.STATUS_ERROR
			end
		end
	end
	self:updateCraftingStatus(craftList)
	for _,v in pairs(craftList) do
		--debug(v)
	end
end

return Milo