-- I could depend on WorldEdit for this, but you need to have the 'worldedit'
-- permission to use those commands and you don't have /area_pos{1,2} [x y z|x,y,z]
-- Since this is mostly copied from WorldEdit it is licensed under the AGPL.

areas.marker1 = {}
areas.marker2 = {}
areas.set_pos = {}
areas.pos1 = {}
areas.pos2 = {}

minetest.register_chatcommand("select_area", {
	params = "<id>",
	description = "Select a area by id.",
	privs = {},
	func = function(name, param)
		local id = tonumber(param)
		if not id then
			minetest.chat_send_player(name, "Invalid usage, see /help select_area.")
		end

		for k, area in pairs(areas.areas) do
			if area.id == id then
				areas:setPos1(name, area.pos1)
				areas:setPos2(name, area.pos2)
				minetest.chat_send_player(name, "Area "..tostring(id).." selected.")
				return
			end
		end
		minetest.chat_send_player(name, "The area "..tostring(id).." does not exist.")
end})

minetest.register_chatcommand("area_pos1", {
	params = "[X Y Z|X,Y,Z]",
	description = "Set area protection region position 1 to the player's location or the one specified",
	privs = {},
	func = function(name, param)
		local pos = {}
		local found, _, x, y, z = param:find("^(-?%d+)[%s%,]+(-?%d+)[%s%,]+(-?%d+)$")
		if found then
			pos = {x=tonumber(x), y=tonumber(y), z=tonumber(z)}
		elseif param == "" then
			player = minetest.get_player_by_name(name)
			if player then
				pos = player:getpos()
			else
				minetest.chat_send_player(name, "Unable to get position")
				return
			end
		else
			minetest.chat_send_player(name, "Invalid usage, see /help no_pos1")
		end
		pos.x, pos.y, pos.z = math.floor(pos.x + 0.5), math.floor(pos.y + 0.5), math.floor(pos.z + 0.5)
		areas:setPos1(name, pos)
		minetest.chat_send_player(name, "Area position 1 set to " .. minetest.pos_to_string(pos))
	end,
})

minetest.register_chatcommand("area_pos2", {
	params = "[X Y Z|X,Y,Z]",
	description = "Set area protection region position 2 to the player's location or the one specified",
	privs = {},
	func = function(name, param)
		local pos = {}
		local found, _, x, y, z = param:find("^(-?%d+)[%s%,]+(-?%d+)[%s%,]+(-?%d+)$")
		if found then
			pos = {x=tonumber(x), y=tonumber(y), z=tonumber(z)}
		elseif param == "" then
			player = minetest.get_player_by_name(name)
			if player then
				pos = player:getpos()
			else
				minetest.chat_send_player(name, "Unable to get position")
				return
			end
		else
			minetest.chat_send_player(name, "Invalid usage, see /help no_pos2")
		end
		pos.x, pos.y, pos.z = math.floor(pos.x + 0.5), math.floor(pos.y + 0.5), math.floor(pos.z + 0.5)
		areas:setPos2(name, pos)
		minetest.chat_send_player(name, "Area position 2 set to " .. minetest.pos_to_string(pos))
	end,
})


minetest.register_chatcommand("area_pos", {
	params = "set/set1/set2/get",
	description = "Set area protection region, position 1, or position 2 by punching nodes, or display the region",
	privs = {},
	func = function(name, param)
		if param == "set" then -- Set both area positions
			areas.set_pos[name] = "pos1"
			minetest.chat_send_player(name, "Select positions by punching two nodes")
		elseif param == "set1" then -- Set area position 1
			areas.set_pos[name] = "pos1only"
			minetest.chat_send_player(name, "Select position 1 by punching a node")
		elseif param == "set2" then -- Set area position 2
			areas.set_pos[name] = "pos2"
			minetest.chat_send_player(name, "Select position 2 by punching a node")
		elseif param == "get" then -- Display current area positions
			if areas.pos1[name] ~= nil then
				minetest.chat_send_player(name, "Position 1: " .. minetest.pos_to_string(areas.pos1[name]))
			else
				minetest.chat_send_player(name, "Position 1 not set")
			end
			if areas.pos2[name] ~= nil then
				minetest.chat_send_player(name, "Position 2: " .. minetest.pos_to_string(areas.pos2[name]))
			else
				minetest.chat_send_player(name, "Position 2 not set")
			end
		else
			minetest.chat_send_player(name, "Unknown subcommand: " .. param)
		end
	end,
})

function areas:getPos1(playerName)
	return areas.pos1[playerName]
end

function areas:getPos2(playerName)
	return areas.pos2[playerName]
end

function areas:setPos1(playerName, pos)
	areas.pos1[playerName] = pos
	areas.markPos1(playerName)
end

function areas:setPos2(playerName, pos)
	areas.pos2[playerName] = pos
	areas.markPos2(playerName)
end


minetest.register_on_punchnode(function(pos, node, puncher)
	local name = puncher:get_player_name()
	if name ~= "" and areas.set_pos[name] ~= nil then --currently setting position
		if areas.set_pos[name] == "pos1" then --setting position 1
			areas.pos1[name] = pos
			areas.markPos1(name)
			areas.set_pos[name] = "pos2" --set position 2 on the next invocation
			minetest.chat_send_player(name, "Position 1 set to " .. minetest.pos_to_string(pos))
		elseif areas.set_pos[name] == "pos1only" then --setting position 1 only
			areas.pos1[name] = pos
			areas.markPos1(name)
			areas.set_pos[name] = nil --finished setting positions
			minetest.chat_send_player(name, "Position 1 set to " .. minetest.pos_to_string(pos))
		elseif areas.set_pos[name] == "pos2" then --setting position 2
			areas.pos2[name] = pos
			areas.markPos2(name)
			areas.set_pos[name] = nil --finished setting positions
			minetest.chat_send_player(name, "Position 2 set to " .. minetest.pos_to_string(pos))
		end
	end
end)

-- Modifies positions `pos1` and `pos2` so that each component of `pos1`
-- is less than or equal to its corresponding component of `pos2`,
-- returning two new positions
function areas:sortPos(pos1, pos2)
	if pos1.x > pos2.x then
		pos2.x, pos1.x = pos1.x, pos2.x
	end
	if pos1.y > pos2.y then
		pos2.y, pos1.y = pos1.y, pos2.y
	end
	if pos1.z > pos2.z then
		pos2.z, pos1.z = pos1.z, pos2.z
	end
	return pos1, pos2
end

-- Rounds a position to the nearest integer
function areas:roundPos(pos)
	pos.x = math.floor(pos.x+0.5)
	pos.y = math.floor(pos.y+0.5)
	pos.z = math.floor(pos.z+0.5)
	return pos
end

-- Marks area position 1
areas.markPos1 = function(name)
	local pos = areas.pos1[name]
	if areas.marker1[name] ~= nil then -- Marker already exists
		areas.marker1[name]:remove() -- Remove marker
		areas.marker1[name] = nil
	end
	if pos ~= nil then -- Add marker
		areas.marker1[name] = minetest.add_entity(pos, "areas:pos1")
		areas.marker1[name]:get_luaentity().active = true
	end
end

-- Marks area position 2
areas.markPos2 = function(name)
	local pos = areas.pos2[name]
	if areas.marker2[name] ~= nil then -- Marker already exists
		areas.marker2[name]:remove() -- Remove marker
		areas.marker2[name] = nil
	end
	if pos ~= nil then -- Add marker
		areas.marker2[name] = minetest.add_entity(pos, "areas:pos2")
		areas.marker2[name]:get_luaentity().active = true
	end
end

minetest.register_entity("areas:pos1", {
	initial_properties = {
		visual = "cube",
		visual_size = {x=1.1, y=1.1},
		textures = {"areas_pos1.png", "areas_pos1.png",
		            "areas_pos1.png", "areas_pos1.png",
		            "areas_pos1.png", "areas_pos1.png"},
		collisionbox = {-0.55, -0.55, -0.55, 0.55, 0.55, 0.55},
	},
	on_step = function(self, dtime)
		if self.active == nil then
			self.object:remove()
		end
	end,
	on_punch = function(self, hitter)
		self.object:remove()
		local name = hitter:get_player_name()
		areas.marker1[name] = nil
	end,
})

minetest.register_entity("areas:pos2", {
	initial_properties = {
		visual = "cube",
		visual_size = {x=1.1, y=1.1},
		textures = {"areas_pos2.png", "areas_pos2.png",
		            "areas_pos2.png", "areas_pos2.png",
		            "areas_pos2.png", "areas_pos2.png"},
		collisionbox = {-0.55, -0.55, -0.55, 0.55, 0.55, 0.55},
	},
	on_step = function(self, dtime)
		if self.active == nil then
			self.object:remove()
		end
	end,
	on_punch = function(self, hitter)
		self.object:remove()
		local name = hitter:get_player_name()
		areas.marker2[name] = nil
	end,
})