-- accessibility/init.lua — mod entry point.
--
-- This is the ONLY thing the game calls into. main.lua gains exactly one line:
--
--     require("accessibility").initialize()
--
-- placed after console.prepare() and before the first states.switch(). By that
-- point templates are preprocessed, keybindings are loaded, states.setup() has
-- run, and the console canvas exists — everything we patch is ready.
--
-- Everything here is wrapped so that a bug in the mod degrades to "no speech"
-- rather than taking the game down with it.

local accessibility = {}

local speech = require("accessibility.speech")
local stateNames = require("accessibility.stateNames")
local hotkeys = require("accessibility.hotkeys")
local walltones = require("accessibility.walltones")

local initialized = false

--------------------------------------------------------------------------------
-- Patch registry
--
-- Later phases register their patches here. Each entry is {name, fn}; fn is called
-- inside a pcall during initialize(), and a failure disables only that patch.
--------------------------------------------------------------------------------

local patches = {}

function accessibility.registerPatch(name, fn)
	patches[#patches + 1] = {name = name, fn = fn}
end

local patchResults = {}

local function applyPatches()
	for _, patch in ipairs(patches) do
		local ok, err = pcall(patch.fn)
		patchResults[patch.name] = ok and "ok" or tostring(err)
		if not ok then
			print("[accessibility] patch '" .. patch.name .. "' FAILED: " .. tostring(err))
		end
	end
end

-- Startup self-test output. This is the version-bump canary: when the game
-- updates and something we hook has moved, it shows up here immediately rather
-- than as silence three screens into a playthrough.
function accessibility.selfTest()
	print("[accessibility] --- self test ---")
	print("[accessibility] TTS: " .. (speech.isAvailable() and "available"
		or ("UNAVAILABLE (" .. tostring(speech.getFailureReason()) .. ")")))
	if speech.isAvailable() then
		-- Distinguishes "DLL loaded" from "actually reached a screen reader or SAPI".
		print("[accessibility] speech channel: " .. (speech.hasSpeech() and "yes" or "NO — nothing will be audible"))
	end
	for name, result in pairs(patchResults) do
		print("[accessibility] patch " .. name .. ": " .. result)
	end
	print("[accessibility] --- end self test ---")
end

--------------------------------------------------------------------------------
-- Core hooks into states.lua
--------------------------------------------------------------------------------

local function hookStates()
	local states = require("states")

	-- Screen changes: announce the new screen.
	local realSwitch = states.switch
	states.switch = function(newState, params)
		local result = realSwitch(newState, params)

		-- After the switch, so a state's open() has already set up its focus.
		pcall(function()
			local name = stateNames[newState] or newState
			speech.say(name, true)
		end)

		return result
	end

	-- Per-frame speech flush. main.lua calls states.update(dt) via a table lookup,
	-- so wrapping the field here avoids editing love.update.
	local realUpdate = states.update
	states.update = function(dt)
		local result = realUpdate(dt)
		pcall(walltones.update)
		pcall(speech.flush)
		return result
	end

	-- Global hotkey layer. Ours are consumed; everything else falls through to the
	-- game untouched.
	local realKeypressed = states.keypressed
	states.keypressed = function(key, scancode)
		local consumed = false
		local ok, result = pcall(hotkeys.keypressed, key, scancode)
		if ok then
			consumed = result
		end

		if consumed then
			return
		end

		pcall(hotkeys.onGameKey)
		return realKeypressed(key, scancode)
	end
end

--------------------------------------------------------------------------------
-- Entry point
--------------------------------------------------------------------------------

function accessibility.initialize()
	if initialized then
		return
	end
	initialized = true

	accessibility.registerPatch("console", require("accessibility.patches.console"))

	local ok, err = pcall(function()
		speech.initialize()
		walltones.load()
		hookStates()
		applyPatches()
	end)

	if not ok then
		print("[accessibility] initialisation FAILED, game continues unmodified: " .. tostring(err))
		return
	end

	accessibility.selfTest()
end

return accessibility