--- Entry point.
-- @module advtrains_doc_integration
local worldpath = minetest.get_worldpath()
local modpath = minetest.get_modpath("advtrains_doc_integration")
local S = minetest.get_translator("advtrains_doc_integration")
advtrains_doc_integration = {}

for _, m in ipairs{
	"mathutils", "utils", "describe", "hypertext", "latex",
} do
	advtrains_doc_integration[m] = dofile(("%s/%s.lua"):format(modpath, m))
end
local utils = advtrains_doc_integration.utils

local function dlxtrains_livery_information(prototype)
	if not dlxtrains then
		return nil
	end
	local old_update_livery = dlxtrains.update_livery
	dlxtrains.update_livery = function(_, _, x)
		return coroutine.yield(x)
	end
	local env = {
		coroutine = coroutine,
		dlxtrains = table.copy(dlxtrains),
	}
	local function main(G, f)
		setfenv(0, G)
		f()
		return error()
	end
	local t = {coroutine.resume(coroutine.create(main), env, prototype.custom_may_destroy or function() end)}
	dlxtrains.update_livery = old_update_livery
	if not t[1] then
		return nil
	end
	return unpack(t, 2)
end

local advtrains_livery_tools_information
do -- helper for Marnack's Advtrains livery tools
	local atliv = {}
	function atliv:get_textures_from_design(design)
		local tp = type(design)
		if tp == "string" then
			return self:get_textures_from_design(self.liveries[design])
		elseif tp ~= "table" then
			return
		end
		local template = self.templates[design.livery_template_name]
		if not template then
			return nil
		end
		local odef = template.overlays
		local textures = utils.map(template.base_textures, function(str) return {str} end)
		for _, overlay in utils.spairs(design.overlays) do
			local o = odef[overlay.id]
			local t = textures[(o or {}).slot_idx]
			if t and o then
				local alpha = math.min(255, math.max(0, o.alpha or 255))
				table.insert(t, string.format("(%s^[colorize:%s:%d)", utils.texture_escape(o.texture), utils.texture_escape(overlay.color), alpha))
			end
		end
		return utils.map(textures, function(st) return table.concat(st, "^") end)
	end
	local mt = {
		__index = atliv,
	}
	advtrains_livery_tools_information = function(wname)
		if not advtrains_livery_database then
			return nil
		end
		local tnames = advtrains_livery_database.get_livery_template_names_for_wagon(wname)
		if next(tnames) == nil then
			return nil
		end
		local templates = {}
		for _, tname in pairs(tnames) do
			templates[tname] = advtrains_livery_database.get_wagon_livery_template(wname, tname)
		end
		local lnames = advtrains_livery_database.get_predefined_livery_names(wname)
		local lnames_t = {}
		local liveries = {}
		for _, lid in pairs(lnames) do
			local lname = lid.livery_name
			liveries[lname] = advtrains_livery_database.get_predefined_livery(wname, lname)
			table.insert(lnames_t, lname)
		end
		table.sort(tnames)
		table.sort(lnames_t)
		local obj = {
			templates = templates,
			template_names = tnames,
			liveries = liveries,
			livery_names = lnames_t,
		}
		return setmetatable(obj, mt)
	end
end

local prototype_cache = {}
advtrains_doc_integration.prototypes = prototype_cache -- ONLY FOR DEBUGGING

local function adjust_wagon_prototype(itemname, prototype)
	local p = prototype_cache[itemname]
	if p then
		return p
	end
	p = table.copy(prototype)

	if p._doc_wagon_longdesc then
		p.longdesc = p._long_wagon_longdesc
	end
	p.horn_sound = utils.adjust_soundspec(p.horn_sound)
	local pax, driver = 0, 0
	if p.seats and p.seat_groups then
		for _, v in pairs(p.seats) do
			if p.seat_groups[v.group].driving_ctrl_access then
				driver = driver + 1
			else
				pax = pax + 1
			end
			p.seat_groups[v.group].count = (p.seat_groups[v.group].count or 0) + 1
		end
	end
	p.max_passengers = pax
	p.max_drivers = driver
	p.max_seats = pax+driver

	p.doors = {}
	for _, state in pairs {"open", "close"} do
		local st = (prototype.doors or {})[state] or {}
		local state_data = {
			sound = utils.adjust_soundspec(st.sound),
		}
		p.doors[state] = state_data
	end

	local bikelivdef = p.livery_definition
	local dlxlivdef = dlxtrains_livery_information(p)
	local atlivdef = advtrains_livery_tools_information(itemname)
	p.dlxtrains_livery = dlxlivdef
	p.advtrains_livery_tools = atlivdef

	local txbase = p.textures
	p.livery_textures = {}
	if dlxlivdef then
		-- DlxTrains: no "default" livery
		for i = 0, dlxlivdef.count-1 do
			local texture = string.format("%s_%s.png", dlxlivdef.filename_prefix, dlxlivdef[i].code)
			p.livery_textures[2*i] = {texture}
			p.livery_textures[2*i+1] = {texture .. "^[transformR180"}
		end
	else
		p.livery_textures[0] = txbase
	end

	if bikelivdef then
		local slot = p.livery_texture_slot
		local components = bikelivdef.components
		local basefile = bikelivdef.base_texture_file
		for _, pdef in ipairs(bikelivdef.presets) do
			local tx = table.copy(txbase)
			local st = {basefile}
			for _, l in ipairs(pdef.livery_stack.layers) do
				table.insert(st, string.format("(%s^[colorize:%s)", utils.texture_escape(components[l.component].texture_file), utils.texture_escape(l.color)))
			end
			tx[slot] = table.concat(st, "^")
			table.insert(p.livery_textures, tx)
		end
	end

	if atlivdef then
		for _, dname in ipairs(atlivdef.livery_names) do
			table.insert(p.livery_textures, atlivdef:get_textures_from_design(dname) or txbase)
		end
	end

	prototype_cache[itemname] = p
	return p
end

local registered_on_prototype_loaded = {}

--- Register a callback that will be run when a prototype becomes available.
-- @tparam function callback The callback to run when the prototype
-- becomes available. The callback function is passed the itemname and the
-- prototype of the wagon.
function advtrains_doc_integration.register_on_prototype_loaded(callback)
	table.insert(registered_on_prototype_loaded, callback)
end

minetest.register_on_mods_loaded(function()
	for itemname, prototype in pairs(advtrains.wagon_prototypes) do
		prototype = adjust_wagon_prototype(itemname, prototype)
		prototype.name = itemname
		for _, cb in ipairs(registered_on_prototype_loaded) do
			cb(itemname, prototype)
		end
	end
end)

--- Write a wagon datasheet to a LaTeX file in the world path.
-- @tparam string itemname The item name of the wagon prototype.
function advtrains_doc_integration.write_wagon_info_as_latex(itemname)
	local filename = string.format("%s/atdoc_wagon_%s.tex", worldpath, itemname:gsub(":", "_"))
	local description = advtrains_doc_integration.latex.describe_wagon_prototype(itemname)
	if description then
		minetest.safe_file_write(filename, description)
	end
end

--- Write a wagon datasheet for each wagon using @{write_wagon_info_as_latex}.
function advtrains_doc_integration.write_all_wagons_as_latex()
	for k in pairs(prototype_cache) do
		advtrains_doc_integration.write_wagon_info_as_latex(k)
	end
end

minetest.register_chatcommand("atdoc_write", {
	params = "",
	description = S("Export Advtrains-related information"),
	privs = {server = true},
	func = function()
		advtrains_doc_integration.write_all_wagons_as_latex()
	end,
})

dofile(modpath .. "/doc_ui.lua")
if minetest.get_modpath("mtt") then
	dofile(modpath .. "/mtt.lua")
end