local S = climate_mod.i18n

-- parse heat values into readable format
-- also convert to Celsius if configured
local function parse_heat(heat)
	local indicator = "°F"
	if not climate_mod.settings.fahrenheit then
		heat = (heat - 32) * 5 / 9
		indicator = "°C"
	end
	heat = math.floor(heat * 100) / 100
	return heat .. indicator
end


-- register weather privilege in order to modify the weather status
minetest.register_privilege("weather", {
	description = S("Make changes to the current weather"),
	give_to_singleplayer = false
})

-- display general information on current weather
minetest.register_chatcommand("weather", {
	description = S("Display weather information"),
	func = function(playername)
		local player = minetest.get_player_by_name(playername)
		local ppos = player:get_pos()
		local weathers = climate_api.environment.get_weather_presets(player)
		local effects = climate_api.environment.get_effects(player)
		local heat = climate_api.environment.get_heat(ppos)
		local humidity = math.floor(climate_api.environment.get_humidity(ppos) * 100) / 100
		local msg = ""
		if #weathers > 0 then
			msg = msg .. S("The following weather presets are active for you:") .. " "
			for _, weather in ipairs(weathers) do
				msg = msg .. weather .. ", "
			end
			msg = msg:sub(1, #msg-2) .. "\n"
		else
			msg = msg .. S("Your sky is clear. No weather presets are currently active.") .. "\n"
		end
		if #effects > 0 then
			msg = msg .. S("As a result, the following environment effects are applied:") .. " "
			for _, effect in ipairs(effects) do
				msg = msg .. effect .. ", "
			end
			msg = msg:sub(1, #msg-2) .. "\n"
		end
		local heat_desc
		if heat > 80 then heat_desc = S("scorching")
		elseif heat > 50 then heat_desc = S("pleasant")
		else heat_desc = S("chilly") end
		msg = msg .. S("It is a @1 @2 right now and humidity is at @3%.", heat_desc, parse_heat(heat), humidity) .. "\n"
		minetest.chat_send_player(playername, msg)
	end
})

-- set base heat to increase or decrease global climate temperatures
minetest.register_chatcommand("set_base_heat", {
	params = "<heat>",
	description = S("Override the weather algorithm's base heat"),
	privs = { weather = true },
	func = function(playername, param)
		if param == nil or param == "" then
			minetest.chat_send_player(playername, S("Provide a number to modify the base heat"))
			return
		end
		if param == "auto" then param = 0 end
		climate_mod.settings.heat = tonumber(param) or 0
		minetest.chat_send_player(playername, S("Base heat changed"))
	end
})

-- override global heat levels with given value
minetest.register_chatcommand("set_heat", {
	params = "<heat>",
	description = S("Override the weather algorithm's heat"),
	privs = { weather = true },
	func = function(playername, param)
		if param == nil or param == "" then
			minetest.chat_send_player(playername, S("Provide a number to modify the heat"))
			return
		end
		if param == "auto" then
			climate_mod.forced_enviroment.heat = nil
			minetest.chat_send_player(playername, S("Heat value reset"))
		else
			climate_mod.forced_enviroment.heat = tonumber(param) or 0
			minetest.chat_send_player(playername, S("Heat value changed"))
		end
	end
})

-- set base heat to increase or decrease global climate humidity
minetest.register_chatcommand("set_base_humidity", {
	params = "<humidity>",
	description = S("Override the weather algorithm's base humidity"),
	privs = { weather = true },
	func = function(playername, param)
		if param == "auto" then param = 0 end
		if param == nil or param == "" then
			minetest.chat_send_player(playername, S("Provide a number to modify the base humidity"))
			return
		end
		climate_mod.settings.humidity = tonumber(param) or 0
		minetest.chat_send_player(playername, S("Base humidity changed"))
	end
})

-- override global humidity with given value
minetest.register_chatcommand("set_humidity", {
	params = "<humidity>",
	description = S("Override the weather algorithm's humidity"),
	privs = { weather = true },
	func = function(playername, param)
		if param == nil or param == "" then
			minetest.chat_send_player(playername, S("Provide a number to modify the humidity"))
			return
		end
		if param == "auto" then
			climate_mod.forced_enviroment.humidity = nil
			minetest.chat_send_player(playername, S("Humidity value reset"))
		else
			climate_mod.forced_enviroment.humidity = tonumber(param) or 0
			minetest.chat_send_player(playername, S("Humidity value changed"))
		end
	end
})

-- override wind direction and speed with given values
minetest.register_chatcommand("set_wind", {
	params = "<wind>",
	description = S("Override the weather algorithm's windspeed"),
	privs = { weather = true },
	func = function(playername, param)
		if param == nil or param == "" then
			minetest.chat_send_player(playername, S("Provide a vector of two numbers to modify the wind"))
			return
		end
		local arguments = {}
		for w in param:gmatch("%S+") do table.insert(arguments, w) end
		local arg1 = arguments[1]
		local wind_x = tonumber(arguments[1])
		local wind_z = tonumber(arguments[2])
		if arg1 == "auto" then
			climate_mod.forced_enviroment.wind = nil
			minetest.chat_send_player(playername, S("Wind reset"))
		elseif wind_x == nil or wind_z == nil then
			minetest.chat_send_player(playername, S("Invalid wind configuration"))
		else
			climate_mod.forced_enviroment.wind = vector.new({
				x = wind_x,
				y = 0,
				z = wind_z
			})
			minetest.chat_send_player(playername, S("Wind changed"))
		end
	end
})

-- display current mod config
minetest.register_chatcommand("weather_settings", {
	description = S("Print the active Climate API configuration"),
	func = function(playername)
		minetest.chat_send_player(playername, S("Current Settings") .. "\n================")
		for setting, value in pairs(climate_mod.settings) do
			minetest.chat_send_player(playername, dump2(value, setting))
		end
	end
})

-- force a weather preset or disable it
minetest.register_chatcommand("set_weather", {
	params ="<weather> <status>",
	description = S("Turn the specified weather preset on or off for all players or reset it to automatic"),
	privs = { weather = true },
	func = function(playername, param)
		local arguments = {}
		for w in param:gmatch("%S+") do table.insert(arguments, w) end
		local weather = arguments[1]
		if weather == nil or climate_mod.weathers[weather] == nil then
			minetest.chat_send_player(playername, S("Unknown weather preset"))
			return
		end
		local status
		if arguments[2] == nil or arguments[2] == "" then
			arguments[2] = "on"
		end
		if arguments[2] == "on" then
			status = true
		elseif arguments[2] == "off" then
			status = false
		elseif arguments[2] == "auto" then
			status = nil
		else
			minetest.chat_send_player(playername, S("Invalid weather status. Set the preset to either on, off or auto."))
			return
		end
		climate_mod.forced_weather[weather] = status
		minetest.chat_send_player(playername, S("Weather @1 successfully set to @2", weather, arguments[2]))
	end
})

-- list all weather presets and whether they have been forced or disabled
minetest.register_chatcommand("weather_status", {
	description = S("Prints which weather presets are enforced or disabled"),
	func = function(playername)
		minetest.chat_send_player(playername, S("Current activation rules:") .. "\n================")
		for weather, _ in pairs(climate_mod.weathers) do
			local status = "auto"
			if climate_mod.forced_weather[weather] == true then
				status = "on"
			elseif climate_mod.forced_weather[weather] == false then
				status = "off"
			end
			minetest.chat_send_player(playername, dump2(status, weather))
		end
	end
})

-- show all environment influences and their values for the executing player
minetest.register_chatcommand("weather_influences", {
	description = S("Prints which weather influences cause your current weather"),
	func = function(playername)
		minetest.chat_send_player(playername, S("Current influences rules:") .. "\n================")
		local player = minetest.get_player_by_name(playername)
		local influences = climate_mod.trigger.get_player_environment(player)
		for influence, value in pairs(influences) do
			minetest.chat_send_player(playername, dump2(value, influence))
		end
	end
})

-- used to debug downfall
minetest.register_chatcommand("explain_humidity", {
	description = "Explains how the humidity value got calculated",
	func = function(playername)
		local base = climate_mod.settings.humidity
		local biome = minetest.get_humidity((minetest.get_player_by_name(playername)):get_pos())
		local random = climate_mod.state:get_float("humidity_random");
		local random_base = climate_mod.state:get_float("humidity_base");
		minetest.chat_send_player(playername, dump2(base, "base"))
		minetest.chat_send_player(playername, dump2(biome, "biome"))
		minetest.chat_send_player(playername, dump2(random, "random"))
	end
})