-- Global namespace for functions

mcl_fire = {}


--
-- Items
--

-- Flame nodes

minetest.register_node("mcl_fire:fire", {
	description = "Fire",
	drawtype = "firelike",
	tiles = {
		{
			name = "fire_basic_flame_animated.png",
			animation = {
				type = "vertical_frames",
				aspect_w = 16,
				aspect_h = 16,
				length = 1
			},
		},
	},
	inventory_image = "fire_basic_flame.png",
	paramtype = "light",
	-- Real light level: 15 (but Minetest caps at 14)
	light_source = 14,
	walkable = false,
	buildable_to = true,
	sunlight_propagates = true,
	damage_per_second = 1,
	groups = {igniter = 1, dig_immediate = 3, not_in_creative_inventory = 1},
	on_timer = function(pos)
		local f = minetest.find_node_near(pos, 1, {"group:flammable"})
		if not f then
			minetest.remove_node(pos)
			return
		end
		-- Restart timer
		return true
	end,
	drop = "",
	sounds = {},
	on_construct = function(pos)
		minetest.get_node_timer(pos):start(math.random(30, 60))
	end,

	on_blast = function() -- Unaffected by explosions
	end,
})

minetest.register_node("mcl_fire:eternal_fire", {
	description = "Eternal Fire",
	drawtype = "firelike",
	tiles = {
		{
			name = "fire_basic_flame_animated.png",
			animation = {
				type = "vertical_frames",
				aspect_w = 16,
				aspect_h = 16,
				length = 1
			},
		},
	},
	inventory_image = "fire_basic_flame.png",
	paramtype = "light",
	-- Real light level: 15 (but Minetest caps at 14)
	light_source = 14,
	walkable = false,
	buildable_to = true,
	sunlight_propagates = true,
	damage_per_second = 1,
	groups = {igniter = 1, dig_immediate = 3, not_in_creative_inventory = 1},
	sounds = {},
	drop = "",

	on_blast = function() -- Unaffected by explosions
	end,
})

--
-- Sound
--

local flame_sound = minetest.setting_getbool("flame_sound")
if flame_sound == nil then
	-- Enable if no setting present
	flame_sound = true
end

if flame_sound then

	local handles = {}
	local timer = 0

	-- Parameters

	local radius = 8 -- Flame node search radius around player
	local cycle = 3 -- Cycle time for sound updates

	-- Update sound for player

	function mcl_fire.update_player_sound(player)
		local player_name = player:get_player_name()
		-- Search for flame nodes in radius around player
		local ppos = player:getpos()
		local areamin = vector.subtract(ppos, radius)
		local areamax = vector.add(ppos, radius)
		local fpos, num = minetest.find_nodes_in_area(
			areamin,
			areamax,
			{"mcl_fire:fire", "mcl_fire:eternal_fire"}
		)
		-- Total number of flames in radius
		local flames = (num["mcl_fire:fire"] or 0) +
			(num["mcl_fire:eternal_fire"] or 0)
		-- Stop previous sound
		if handles[player_name] then
			minetest.sound_stop(handles[player_name])
			handles[player_name] = nil
		end
		-- If flames
		if flames > 0 then
			-- Find centre of flame positions
			local fposmid = fpos[1]
			-- If more than 1 flame
			if #fpos > 1 then
				local fposmin = areamax
				local fposmax = areamin
				for i = 1, #fpos do
					local fposi = fpos[i]
					if fposi.x > fposmax.x then
						fposmax.x = fposi.x
					end
					if fposi.y > fposmax.y then
						fposmax.y = fposi.y
					end
					if fposi.z > fposmax.z then
						fposmax.z = fposi.z
					end
					if fposi.x < fposmin.x then
						fposmin.x = fposi.x
					end
					if fposi.y < fposmin.y then
						fposmin.y = fposi.y
					end
					if fposi.z < fposmin.z then
						fposmin.z = fposi.z
					end
				end
				fposmid = vector.divide(vector.add(fposmin, fposmax), 2)
			end
			-- Play sound
			local handle = minetest.sound_play(
				"fire_fire",
				{
					pos = fposmid,
					to_player = player_name,
					gain = math.min(0.06 * (1 + flames * 0.125), 0.18),
					max_hear_distance = 32,
					loop = true, -- In case of lag
				}
			)
			-- Store sound handle for this player
			if handle then
				handles[player_name] = handle
			end
		end
	end

	-- Cycle for updating players sounds

	minetest.register_globalstep(function(dtime)
		timer = timer + dtime
		if timer < cycle then
			return
		end

		timer = 0
		local players = minetest.get_connected_players()
		for n = 1, #players do
			mcl_fire.update_player_sound(players[n])
		end
	end)

	-- Stop sound and clear handle on player leave

	minetest.register_on_leaveplayer(function(player)
		local player_name = player:get_player_name()
		if handles[player_name] then
			minetest.sound_stop(handles[player_name])
			handles[player_name] = nil
		end
	end)
end


--
-- ABMs
--

-- Extinguish all flames quickly with water, snow, ice

minetest.register_abm({
	label = "Extinguish flame",
	nodenames = {"mcl_fire:fire", "mcl_fire:eternal_fire"},
	neighbors = {"group:puts_out_fire"},
	interval = 3,
	chance = 1,
	catch_up = false,
	action = function(pos, node, active_object_count, active_object_count_wider)
		minetest.remove_node(pos)
		minetest.sound_play("fire_extinguish_flame",
			{pos = pos, max_hear_distance = 16, gain = 0.15})
	end,
})


-- Enable the following ABMs according to 'enable fire' setting

local fire_enabled = minetest.setting_getbool("enable_fire")
if fire_enabled == nil then
	-- New setting not specified, check for old setting.
	-- If old setting is also not specified, 'not nil' is true.
	fire_enabled = not minetest.setting_getbool("disable_fire")
end

if not fire_enabled then

	-- Remove basic flames only if fire disabled

	minetest.register_abm({
		label = "Remove disabled fire",
		nodenames = {"fire:basic_flame"},
		interval = 7,
		chance = 1,
		catch_up = false,
		action = minetest.remove_node,
	})

else -- Fire enabled

	-- Ignite neighboring nodes, add basic flames

	minetest.register_abm({
		label = "Ignite flame",
		nodenames = {"group:flammable"},
		neighbors = {"group:igniter"},
		interval = 7,
		chance = 12,
		catch_up = false,
		action = function(pos, node, active_object_count, active_object_count_wider)
			-- If there is water or stuff like that around node, don't ignite
			if minetest.find_node_near(pos, 1, {"group:puts_out_fire"}) then
				return
			end
			local p = minetest.find_node_near(pos, 1, {"air"})
			if p then
				minetest.set_node(p, {name = "mcl_fire:fire"})
			end
		end,
	})

	-- Remove flammable nodes around fire

	minetest.register_abm({
		label = "Remove flammable nodes",
		nodenames = {"mcl_fire:fire"},
		neighbors = "group:flammable",
		interval = 5,
		chance = 18,
		catch_up = false,
		action = function(pos, node, active_object_count, active_object_count_wider)
			local p = minetest.find_node_near(pos, 1, {"group:flammable"})
			if p then
				local flammable_node = minetest.get_node(p)
				local def = minetest.registered_nodes[flammable_node.name]
				if def.on_burn then
					def.on_burn(p)
				else
					minetest.remove_node(p)
					minetest.check_for_falling(p)
				end
			end
		end,
	})

end

-- Set pointed_thing on fire
mcl_fire.set_fire = function(pointed_thing)
	local n = minetest.get_node(pointed_thing.above)
	if n.name ~= ""  and n.name == "air" and not minetest.is_protected(pointed_thing.above, "fire") then
		minetest.add_node(pointed_thing.above, {name="mcl_fire:fire"})
	end
end

minetest.register_alias("mcl_fire:basic_flame", "mcl_fire:fire")
minetest.register_alias("fire:basic_flame", "mcl_fire:fire")
minetest.register_alias("fire:permanent_flame", "mcl_fire:eternal_flame")

dofile(minetest.get_modpath(minetest.get_current_modname()).."/flint_and_steel.lua")
dofile(minetest.get_modpath(minetest.get_current_modname()).."/fire_charge.lua")