local function append_slot_texture_and_change_pointer() end
local function remove_txr_from_hotbar() end
local function append_txr_to_selected_slot() end

local base_hotbar_text = "fbrawl_hotbar.png"
local max_yellow_recharge_seconds = 2
local T = fbrawl.T



function fbrawl.show_status_hud(arena)
	if not arena or not arena.in_game then return end
	
	for pl_name, props in pairs(arena.players) do
		local slots = {}
		local player = minetest.get_player_by_name(pl_name)
		local inv = player:get_inventory()
		local list = inv:get_list("main")
		local selected_slot_texture = "gui_hotbar_selected.png"

		-- for each skill in the hotbar determines which color to assign its slot
		for i, itemstack in ipairs(list) do
			local skill_name = itemstack:get_name():gsub("fantasy_brawl", "fbrawl")
			local skill = pl_name:get_skill(skill_name)

			if skill then
				-- first item has a right click and could have a left lick skill, but it's not a skill itself
				if i == 1 then
					local right_skill = pl_name:get_skill(skill.rightclick_skill)
					local left_skill = pl_name:get_skill(skill.leftclick_skill)

					selected_slot_texture = append_slot_texture_and_change_pointer(arena, right_skill, pl_name, slots, i, selected_slot_texture, "right") or selected_slot_texture
					selected_slot_texture = append_slot_texture_and_change_pointer(arena, left_skill, pl_name, slots, i, selected_slot_texture, "left") or selected_slot_texture
				else
					selected_slot_texture = append_slot_texture_and_change_pointer(arena, skill, pl_name, slots, i, selected_slot_texture) or selected_slot_texture
				end
			end
		end
		
		player:hud_set_hotbar_selected_image(selected_slot_texture)

		-- apply the final hotbar texture
		local final_hotbar_tex = base_hotbar_text

		for i, slot_tex in ipairs(slots) do
			final_hotbar_tex = final_hotbar_tex .. "^" .. slot_tex
		end

		player:hud_set_hotbar_image(final_hotbar_tex)
	end

	minetest.after(0, function ()
		fbrawl.show_status_hud(arena)
	end)
end



function append_slot_texture_and_change_pointer(arena, skill, pl_name, slots, i, selected_slot_texture, side)
	local sp_skill = pl_name:get_skill("fbrawl:sp")

	if not skill or not sp_skill then return end

	local player = minetest.get_player_by_name(pl_name)
	local skill_sp = skill.sp

	local pointer_hud = sp_skill.data._hud["pointer_status"]
	local pointer_hud_table = player:hud_get(pointer_hud)

	local remaining_recharge_seconds = 0
	local wielded_idx = player:get_wield_index()

	-- determines remaining_seconds_to_recharge
	if skill_sp and sp_skill then -- when skill uses sp
		local sp_recharged_per_second = sp_skill:get_recharged_sp_per_second()
		local remaining_sp_needed_to_cast_skill = math.max(skill_sp - sp_skill.data.amount, 0)
		remaining_recharge_seconds = remaining_sp_needed_to_cast_skill / sp_recharged_per_second
	end
	if sp_skill and skill.cooldown_timer > 0 then -- when skill has a cooldown
		if skill.cooldown_timer > remaining_recharge_seconds then
			remaining_recharge_seconds = skill.cooldown_timer
		end
	end
	if i == 5 then -- when skill is an ultimate
		remaining_recharge_seconds = fbrawl.min_kills_to_use_ultimate - arena.players[pl_name].ultimate_recharge
	end
	
	if arena.initial_time - arena.current_time > 5 then
		if remaining_recharge_seconds > 0 and wielded_idx == 5 then
			arena_lib.HUD_send_msg("broadcast", pl_name, T("@1 kills left to use the ultimate", remaining_recharge_seconds))
		else
			arena_lib.HUD_hide("broadcast", pl_name)
		end
	end

	-- appends a yellow or red slot to slots and change the pointer HUD
	-- yellow
	if remaining_recharge_seconds > 0 and remaining_recharge_seconds <= max_yellow_recharge_seconds then
		if i == 1 then -- the item with the double skill
			table.insert(slots, "fbrawl_slot_yellow_1_"..side..".png")
			player:hud_change(pointer_hud, "text", 
				pointer_hud_table.text ..
				"^fbrawl_pointer_yellow_"..side..".png"
			)

			if wielded_idx == 1 then 
				selected_slot_texture = selected_slot_texture.."^fbrawl_slot_yellow_"..side..".png"
			end
		else
			if wielded_idx == i then 
				selected_slot_texture = selected_slot_texture.."^fbrawl_slot_yellow.png"
			end
			table.insert(slots, "fbrawl_slot_yellow_"..i..".png")
		end
	
	-- red
	elseif remaining_recharge_seconds > max_yellow_recharge_seconds then
		if i == 1 then
			table.insert(slots, "fbrawl_slot_red_1_"..side..".png")
			player:hud_change(pointer_hud, "text", 
				pointer_hud_table.text ..
				"^fbrawl_pointer_red_"..side..".png"
			)

			if wielded_idx == 1 then 
				selected_slot_texture = selected_slot_texture.."^fbrawl_slot_red_"..side..".png"
			end
		else
			if wielded_idx == i then 
				selected_slot_texture = selected_slot_texture.."^fbrawl_slot_red.png"
			end
			table.insert(slots, "fbrawl_slot_red_"..i..".png")
		end
	end

	-- remove the left/right hud when the recharge is over 
	if (i == 1 and remaining_recharge_seconds == 0) then
		local texture = pointer_hud_table.text
		texture = texture:gsub("%^fbrawl_pointer_red_"..side..".png", "")
		texture = texture:gsub("%^fbrawl_pointer_yellow_"..side..".png", "")

		player:hud_change(pointer_hud, "text", texture)
	end
		
	-- remove the left/right hud when the wielded item is not the first one
	if wielded_idx ~= 1 then
		player:hud_change(pointer_hud, "text", "fbrawl_transparent.png")
	end

	return selected_slot_texture
end