-- creative_regions mod by h3ndrik

creative_regions = {}

local mod_storage = minetest.get_mod_storage()
creative_regions.astore = AreaStore()

creative_regions.region_privs = {}

areas_owner_privs = minetest.settings:get("creative_regions.owner_privs") or "+creative, +fast, +fly"
areas_guest_privs = minetest.settings:get("creative_regions.guest_privs") or "-fly, -fast"
noregion_privs = minetest.settings:get("creative_regions.noregion_privs") or "-creative, +fast, -fly"
default_privs = minetest.settings:get("creative_regions.default_privs") or "+creative, +fast, +fly"

function creative_regions:load_regions()
	self.astore:from_file(minetest.get_worldpath().."/creative_regions_regions")
	creative_regions.region_privs = minetest.deserialize(mod_storage:get_string("astore_privs")) or {}
--	local edge1 = { x=-10, y=-10, z=-10 }
--	local edge2 = { x=10, y=10, z=10 }
--	local data = "Testregion"
--	local astore_id = self.astore:insert_area(edge1, edge2, tostring(data))
--	
--	creative_regions:set_region_privs(astore_id, "+creative, +fast, +fly")
end

function creative_regions:save_regions()
	self.astore:to_file(minetest.get_worldpath().."/creative_regions_regions")
	local datastr = minetest.serialize(creative_regions.region_privs)
	if not datastr then
		minetest.log("error", "[creative_regions] Failed to serialize region_privs data!")
		return
	end
	mod_storage:set_string("astore_privs", datastr)
end

function creative_regions:set_region_privs(id, privs_string)
	creative_regions.region_privs[tostring(id)] = privs_string
end

minetest.register_chatcommand("creative_region", {
	params = "<x> <y> <z>, <x> <y> <z>, <text>",
	description = "Set a creative region from a to b",
	privs = {server = true},
	func = function(name, param)
		local player = minetest.get_player_by_name(name)
		if not player then
			return false, "Player not found"
		end
		local found, _, x1, y1, z1, x2, y2, z2, region_name = param:find("^([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)%s*,%s*([+-]?%d+)%s+([+-]?%d+)%s+([+-]?%d+)%s*,%s*(.+)$")
		if not found then
			return false, "Syntax error"
		end

		local edge1 = { x=tonumber(x1), y=tonumber(y1), z=tonumber(z1) }
		local edge2 = { x=tonumber(x2), y=tonumber(y2), z=tonumber(z2) }
		local data = region_name
		local astore_id = creative_regions.astore:insert_area(edge1, edge2, tostring(data))
		if astore_id then
			creative_regions:set_region_privs(tostring(astore_id), nil)
			minetest.chat_send_player(name, "[creative_regions] New region set. ID: " .. astore_id)
			creative_regions:save_regions()
			return true, "Done"
		else
			return false, "Failed"
		end
	end,
})

minetest.register_chatcommand("creative_region_privs", {
	params = "<id>, <text>",
	description = "Set privstring for creative region",
	privs = {server = true},
	func = function(name, param)
		local player = minetest.get_player_by_name(name)
		if not player then
			return false, "Player not found"
		end
		local found, _, region_id, privstring = param:find("^([+-]?%a?%d+)%s*,%s*(.+)$")
		if not found then
			return false, "Syntax error"
		end
		if privstring and region_id then
			creative_regions:set_region_privs(tostring(region_id), privstring)
			minetest.chat_send_player(name, "[creative_regions] Privstring set for region " .. region_id .. ": " .. privstring)
			creative_regions:save_regions()
			return true, "Done"
		else
			return false, "Failed"
		end
	end,
})

minetest.register_chatcommand("creative_region_rm", {
	params = "<id>",
	description = "Remove a creative region",
	privs = {server = true},
	func = function(name, param)
		local player = minetest.get_player_by_name(name)
		if not player then
			return false, "Player not found"
		end
		local found, _, region_id = param:find("^([+-]?%d+)%s*$")
		if not found then
			return false, "Syntax error"
		end
		local success = creative_regions.astore:remove_area(tonumber(region_id))
		if success then
			minetest.chat_send_player(name, "[creative_regions] Region " .. region_id .. "removed")
			creative_regions:set_region_privs(tostring(region_id), nil)
		else
			minetest.chat_send_player(name, "[creative_regions] Error removing region " .. region_id)
		end
		creative_regions:save_regions()
		return true, "Done."
	end,
})

function creative_regions:decode_privs_string(str)
	-- minetest/builtin/common/misc_helpers.lua:core.string_to_privs()
	assert(type(str) == "string")
	local delim = ','
	local privs_grant = {}
	local privs_revoke = {}
	for _, priv in pairs(string.split(str, delim)) do
		priv = priv:trim()
		local toggle = string.sub(priv, 1, 1)
		priv = string.sub(priv, 2)
		if toggle == '+' then
			privs_grant[priv] = true
			privs_revoke[priv] = nil
		elseif toggle == '-' then
			privs_revoke[priv] = true
			privs_grant[priv] = nil
		end
	end
	return privs_grant, privs_revoke
end

function creative_regions:add_privs_from_string(table, str)

end

function creative_regions:is_areas_mod(area_id)
	area_id = tostring(area_id)
	local is_areas_id = string.sub(id, 1, 2) == "a"
	local a_id = tonumber( string.sub(id, 2) )
	return is_areas_id, a_id
end

function creative_regions:get_region_size(astore_area)
	local pos1 = astore_area.min
	local pos2 = astore_area.max
	local x = math.abs( pos2.x - pos1.x )
	local z = math.abs( pos2.z - pos1.x )
	return x*z
end

function creative_regions:get_areas_area_size(areas_area)
	local pos1 = areas_area.pos1
	local pos2 = areas_area.pos2
	local x = math.abs( pos2.x - pos1.x )
	local z = math.abs( pos2.z - pos1.x )
	return x*z
end

function creative_regions:initial_stuff()
	local stuff_string = minetest.settings:get("initial_stuff") or
		"default:pick_steel,default:axe_steel,default:shovel_steel," ..
		"default:torch 99,default:cobble 99"
	local itemtable = {}
	local items = stuff_string:split(",")
	for _, stack in ipairs(items) do
		table.insert(itemtable, ItemStack(stack))
	end
	return itemtable
end

function creative_regions:save_player_privs(player)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local privs = minetest.get_player_privs(name)
	pmeta:set_string("creative_regions.saved_privs", minetest.serialize(privs))
end

function creative_regions:restore_player_privs(player)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local privs = minetest.deserialize(pmeta:get_string("creative_regions.saved_privs"))
	if privs then
		minetest.set_player_privs(name, privs)
		pmeta:set_string("creative_regions.saved_privs", nil)
	end
end

function creative_regions:save_player_inventory(player, listname)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local inv = player:get_inventory()
	local player_items = inv:get_list("main")
	inv:set_list(listname, player_items)
end

function creative_regions:restore_player_inventory(player, listname)
	local name = player:get_player_name()
	local pmeta = player:get_meta()
	local inv = player:get_inventory()
	local player_items = inv:get_list(listname)
	local give_initial = false
	if not player_items then
		player_items = {}
		give_initial = true
	end
	inv:set_list("main", player_items)
	if give_initial then
		local initial_items = creative_regions:initial_stuff()
		for _, stack in ipairs(initial_items) do
			inv:add_item("main", stack)
		end
	end

end

function creative_regions:player_enter_region(player, privstring)
	local name = player:get_player_name()
	local has_creative = minetest.check_player_privs(name, {creative=true})
	
	local privs_grant, privs_revoke = creative_regions:decode_privs_string(privstring)

	if not has_creative and privs_grant.creative and not privs_revoke.creative then
		minetest.chat_send_player(name, "You entered creative mode")
		creative_regions:save_player_inventory(player, "saved_survival")
		creative_regions:restore_player_inventory(player, "saved_creative")
		if minetest.get_modpath("unified_inventory") then
			unified_inventory.set_inventory_formspec(player, unified_inventory.default)
		end
	elseif has_creative and privs_revoke.creative then
		minetest.chat_send_player(name, "You entered survival mode")
		creative_regions:save_player_inventory(player, "saved_creative")
		creative_regions:restore_player_inventory(player, "saved_survival")
	end
	
	local has_privs = minetest.get_player_privs(name)
	local privs = has_privs
	for newpriv, _ in pairs(privs_grant) do
		privs[newpriv] = true
	end
	for newpriv, _ in pairs(privs_revoke) do
		privs[newpriv] = nil
	end
	minetest.set_player_privs(name, privs)

end

function creative_regions:update_player(player)
	local name = player:get_player_name()
	local pos = vector.round(player:get_pos())

	local pmeta = player:get_meta()
--	pmeta:mark_as_private("creative_regions.active_regions")
	local player_last_active_regions = pmeta:get_string("creative_regions.active_regions") or "-1"
	local player_active_regions = "-1"
	local areas_owner = false
	local areas_guest = false
	local areas_open = false
	local smallest_region = {}
	local smallest_areas_area = {}

	if minetest.check_player_privs(name, { protection_bypass=true }) then
		--minetest.chat_send_player(name, "Changed region. You have protection_bypass priv")
		return
	end

	-- enter region
	local current_regions = self.astore:get_areas_for_pos(pos, true, true)
	for astore_id, astore_area in pairs( current_areas ) do
		local regionsize = creative_regions:get_region_size(astore_area)
		if not smallest_region.size or regionsize < smallest_region.size then
			smallest_region.id = tostring(astore_id)
			smallest_region.size = regionsize
		end
	end
	if smallest_region.id then
		player_active_regions = tostring(smallest_region.id)
	end

	-- enter areas mod area
	local a_current_areas =  {}
	if minetest.get_modpath("areas") then
		a_current_areas = areas:getAreasAtPos(pos)
		for a_id, a_area in pairs( a_current_areas ) do
			local areasize = creative_regions:get_areas_area_size(a_area)
			if not smallest_areas_area.size or areasize < smallest_areas_area.size then
				smallest_areas_area.id = tostring(a_id)
				smallest_areas_area.size = areasize
			end
			player_active_areas = player_active_areas .. ", a"..a_id
			if a_area.owner == name then
				areas_owner = true
				break
			elseif a_area.open then
				areas_open = true
				break
			else
				areas_guest = true
				--continue
			end
		end
	end

	local privstring = noregion_privs
	if smallest_region.id then
		if creative_regions.region_privs[tostring(smallest_region.id)] then
			privstring = creative_regions.region_privs[tostring(smallest_region.id)]
		else
			privstring = default_privs
		end
	end
	if areas_owner or areas_open then
		privstring = privstring .. ", " .. areas_owner_privs
	elseif areas_guest then
		privstring = privstring .. ", " .. areas_guest_privs
		for _, a in pairs(string.split(player_active_regions, ",")) do
			a = a:trim()
			if string.sub(a, 1, 1) == "a" then
				if creative_regions.region_privs[a] then
					privstring = privstring .. ", " .. creative_regions.region_privs[a]
				end
			end
		end
		if smallest_areas_area.size and smallest_region.size then
			if smallest_region.size <= smallest_areas_area.size then
				privstring = privstring .. ", " .. creative_regions.region_privs[tostring(smallest_region.id)]
			end
		end
	end

	if player_active_regions ~= player_last_active_regions then
		creative_regions:player_enter_region(player, privstring)
		pmeta:set_string("creative_regions.active_regions", player_active_regions)
	end

--	print(dump(pmeta:to_table()))
end

creative_regions:load_regions()

local timer = 0
minetest.register_globalstep(function(dtime)
	timer = timer + dtime
	if timer >= 1 then
		for _, player in pairs(minetest.get_connected_players()) do
			creative_regions:update_player(player)
		end
	end
end)

-- areas mod hud
if minetest.get_modpath("areas") then
	local function areas_hud_handler(pos, areas)
		local current_regions = creative_regions.astore:get_areas_for_pos(pos, false, true)
		for astore_id, astore_area in pairs( current_regions ) do
			if astore_id then
				table.insert(areas, {
					id = "mod:"..astore_id,
					name = astore_area.data,
					--owner = "",
				})
			end
		end
	end

	areas:registerHudHandler(areas_hud_handler)
end