local groupdefs = {
	["book"] = "Books",
	["vessel"] = "Vessels",
	["dye"] = "Dyes",
	["stick"] = "Sticks",
	["wool"] = "Wool",
	["sand"] = "Sand",
	["wood"] = "Wood",
	["stone"] = "Stones",
	["metal"] = "Metal",
	["tree"] = "Tree Trunks",
	["fence"] = "Fences",
	["wall"] = "Walls",
	["leaves"] = "Leaves and Needles",
	["flower"] = "Flowers",
	["sapling"] = "Saplings",
	["water"] = "Water",
	["lava"] = "Lava",

	["cracky"] = "Cracky",
	["crumbly"] = "Crumbly",
	["choppy"] = "Choppy",
	["snappy"] = "Snappy",
	["bendy"] = "Bendy",
	["oddly_breakable_by_hand"] = "Hand-breakable",

	["fleshy"] = "Flesh",
}

local miscgroups = { "book", "vessel", "dye", "stick", "wool", "sand", "wood", "stone", "metal", "tree", "fence", "wall", "leaves", "flower", "sapling", "water", "lava" }

local forced_items = {
	"default:book_written",
	"default:cloud",
	"bones:bones",
	"farming:soil",
	"farming:soil_wet",
	"farming:desert_sand_soil",
	"farming:desert_sand_soil_wet",
	"fire:basic_flame",
	"farming:wheat_8",
	"farming:cotton_8",
	"doors:door_wood_a",
	"doors:door_steel_a",
	"doors:door_glass_a",
	"doors:door_obsidian_glass_a",
}

local suppressed_items = {
	"doors:door_wood",
	"doors:door_steel",
	"doors:door_glass",
	"doors:door_obsidian_glass",
}

local item_name_overrides = {
	["screwdriver:screwdriver"] = "Screwdriver",
	["fire:basic_flame"] = "Basic Flame",
	["farming:wheat_8"] = "Wheat Plant",
	["farming:cotton_8"] = "Cotton Plant",
	["default:lava_source"] = "Lava",
	["default:water_source"] = "Water",
	["default:river_water_source"] = "River Water",
	["doors:door_wood_a"] = minetest.registered_items["doors:door_wood"].description,
	["doors:door_steel_a"] = minetest.registered_items["doors:door_steel"].description,
	["doors:door_glass_a"] = minetest.registered_items["doors:door_glass"].description,
	["doors:door_obsidian_glass_a"] = minetest.registered_items["doors:door_obsidian_glass"].description,
}

doc.sub.items.add_real_group_names(groupdefs)
doc.sub.items.add_notable_groups(miscgroups)
doc.sub.items.add_forced_item_entries(forced_items)
doc.sub.items.add_suppressed_item_entries(suppressed_items)
doc.sub.items.add_item_name_overrides(item_name_overrides)


-- Minetest Game Factoids

-- Groups flammable, puts_out_fire
local function f_fire(itemstring, def)
	local s = ""
	-- Fire
	if def.groups.flammable == 1 then
		s = s .. "This block is flammable and burns slowly."
	elseif def.groups.flammable == 2 then
		s = s .. "This block is flammable and burns at medium speed."
	elseif def.groups.flammable == 3 then
		s = s .. "This block is highly flammable and burns very quickly."
	elseif def.groups.flammable == 4 then
		s = s .. "This block is very easily set on fire and burns extremely quickly."
	elseif def.groups.flammable ~= nil then
		s = s .. "This block is flammable."
	end

	if def.groups.puts_out_fire ~= nil then
		if def.groups.flammable ~= nil then
			s = s .. "\n"
		end
		s = s .. "This block will extinguish nearby fire."
	end

	if def.groups.igniter ~= nil then
		if def.groups.flammable ~= nil or def.groups.puts_out_fire ~= nil then
			s = s .. "\n"
		end
		s = s .. "This block will set flammable blocks within a radius of "..def.groups.igniter.." on fire."
	end
	return s
end

-- flora group
local function f_flora(itemstring, def)
	if def.groups.flora == 1 then
		return "This block belongs to the Flora group. It a living organism which likes to grow and spread on dirt with grass or dirt with dry grass when it is in light. On desert sand, it will wither and die and turn into a dry shrub."
	else
		return ""
	end
end

-- soil group
local function f_soil(itemstring, def)
	if def.groups.soil == 1 then
		return "This block is natural soil. It supports the spreading of blocks belonging to the Flora group and the growth of blocks belonging to the Saplings group."
	elseif def.groups.soil == 2 or def.groups.soil == 3 then
		return "This block serves as a soil for wild plants (Flora, Saplings) as well as plants grown from seeds. It supports their growth and spreading."
	else
		return ""
	end
end

doc.sub.items.register_factoid("nodes", "groups", f_fire)
doc.sub.items.register_factoid("nodes", "groups", f_flora)
doc.sub.items.register_factoid("nodes", "groups", f_soil)

-- Add node aliases
for i=2,5 do
	doc.add_entry_alias("nodes", "default:grass_1", "default:grass_"..i)
	doc.add_entry_alias("nodes", "default:dry_grass_1", "default:dry_grass_"..i)
end
for i=1,7 do
	doc.add_entry_alias("nodes", "farming:wheat_8", "farming:wheat_"..i)
	doc.add_entry_alias("nodes", "farming:cotton_8", "farming:cotton_"..i)
end
doc.add_entry_alias("nodes", "default:lava_source", "default:lava_flowing")
doc.add_entry_alias("nodes", "default:water_source", "default:water_flowing")
doc.add_entry_alias("nodes", "default:river_water_source", "default:river_water_flowing")
doc.add_entry_alias("nodes", "default:furnace", "default:furnace_active")
doc.add_entry_alias("nodes", "doors:door_wood_a", "doors:door_wood_b")
doc.add_entry_alias("nodes", "doors:door_steel_a", "doors:door_steel_b")
doc.add_entry_alias("nodes", "doors:door_glass_a", "doors:door_glass_b")
doc.add_entry_alias("nodes", "doors:door_obsidian_glass_a", "doors:door_obsidian_glass_b")
doc.add_entry_alias("nodes", "doors:gate_wood_closed", "doors:gate_wood_open")
doc.add_entry_alias("nodes", "doors:gate_junglewood_closed", "doors:gate_junglewood_open")
doc.add_entry_alias("nodes", "doors:gate_acacia_wood_closed", "doors:gate_acacia_wood_open")
doc.add_entry_alias("nodes", "doors:gate_aspen_wood_closed", "doors:gate_aspen_wood_open")
doc.add_entry_alias("nodes", "doors:gate_pine_wood_closed", "doors:gate_pine_wood_open")
doc.add_entry_alias("nodes", "doors:trapdoor", "doors:trapdoor_open")
doc.add_entry_alias("nodes", "doors:trapdoor_steel", "doors:trapdoor_steel_open")
doc.add_entry_alias("nodes", "tnt:tnt", "tnt:tnt_burning")
local pane_aliases = {}
local bar_aliases = {}
for i=1,15 do
	table.insert(pane_aliases, "xpanes:pane_"..i)
	table.insert(bar_aliases, "xpanes:bar_"..i)
end
doc.add_entry_aliases("nodes", "xpanes:pane", pane_aliases)
doc.add_entry_aliases("nodes", "xpanes:bar", bar_aliases)

-- Gather help texts
dofile(minetest.get_modpath("doc_minetest_game") .. "/helptexts.lua")

-- Register boat object for doc_identifier
if minetest.get_modpath("doc_identifier") ~= nil then
	doc.sub.identifier.register_object("boats:boat", "craftitems", "boats:boat")
end

-- Achievement
local awardchecktime = 0
if minetest.get_modpath("awards") ~= nil then
	-- TODO: Change the goal to unlocking/discovering all block entries of Minetest Game
	-- (excluding unused blocks like default:cloud)
	awards.register_achievement("doc_minetest_game_allnodes", {
		title = "Block Index Completed",
		icon = "doc_awards_icon_generic.png",
		description = "Read all help entries about blocks.",
	})

	minetest.register_globalstep(function(dtime)
		-- Check awards every 30 seconds
		awardchecktime = awardchecktime + dtime
		if awardchecktime < 30 then return end
		awardchecktime = 30 - awardchecktime
		local players = minetest.get_connected_players()
		for p=1,#players do
			local playername = players[p]:get_player_name()
			local count = doc.get_viewed_count(playername, "nodes")
			if count ~= nil and count >= doc.get_entry_count("nodes") then
				awards.unlock(playername, "doc_minetest_game_allnodes")
			end
		end
	end)
end