-- Patch: modules/slider.lua
--
-- The slider is genuinely generic: `modules/slider.lua` is a factory
-- (`newSlider(params)`) and every quantity slider in the game comes from it.
-- Four states use it:
--
--   craft        -- how many items to process
--   refine       -- same
--   trade        -- how many to buy/sell
--   ingame_wait  -- how many turns to wait
--
-- So one wrapper on the factory narrates all four, with no per-state work. This
-- is the same leverage as the console.print and inventoryCursorPopup patches.
--
-- NOTE: the options screens (config_menu / settings_menu) do NOT use this. They
-- adjust values through config.increase / config.decrease instead, and are
-- handled by accessibility/states/config_menu.lua.

-- ORDERING: this replaces package.loaded, so it only affects requires that happen
-- AFTER it runs. That is safe here because states are loaded lazily by states.lua
-- (each `require("states/"..name)` happens on first switch), and these four are
-- the only requirers. applyPatches() also runs before the self-test, which is the
-- one thing that loads state files early.

local speech = require("accessibility.speech")

return function()
	local newSlider = require("modules.slider")

	if type(newSlider) ~= "function" then
		error("modules.slider is not a factory function -- game structure changed")
	end

	package.loaded["modules.slider"] = function(params)
		local slider = newSlider(params)

		local realSetValue = slider.setValue
		if not realSetValue then
			return slider
		end

		-- Announce only on an actual change. setValue is called during
		-- construction, on every frame of a mouse drag, and on each repeat of a
		-- held key -- speaking unconditionally would stutter badly.
		local lastSpoken = slider.currentValue

		slider.setValue = function(newValue, noFlip)
			local result = realSetValue(newValue, noFlip)

			pcall(function()
				local current = slider.currentValue
				if current == lastSpoken then
					return
				end
				lastSpoken = current

				-- Interrupt: the value is the answer to the key just pressed, and
				-- a backlog of intermediate numbers is worse than useless.
				speech.say(tostring(current), true)
			end)

			return result
		end

		return slider
	end
end