/datum/controller/configuration
	name = "Configuration"

	var/directory = "config"

	var/warned_deprecated_configs = FALSE
	var/hiding_entries_by_type = TRUE //Set for readability, admins can set this to FALSE if they want to debug it
	var/list/entries
	var/list/entries_by_type

	var/list/maplist
	var/datum/map_config/defaultmap

	var/list/modes // allowed modes
	var/list/gamemode_cache
	var/list/votable_modes // votable modes
	var/list/mode_names
	var/list/mode_reports
	var/list/mode_false_report_weight

	var/motd
	var/policy

	/// If the configuration is loaded
	var/loaded = FALSE

	/// If a reload is in progress
	var/reload_in_progress = FALSE

	/// A regex that matches words blocked IC
	var/static/regex/ic_filter_regex

	/// A regex that matches words blocked OOC
	var/static/regex/ooc_filter_regex

	/// A regex that matches words blocked IC, but not in PDAs
	var/static/regex/ic_outside_pda_filter_regex

	/// A regex that matches words soft blocked IC
	var/static/regex/soft_ic_filter_regex

	/// A regex that matches words soft blocked OOC
	var/static/regex/soft_ooc_filter_regex

	/// A regex that matches words soft blocked IC, but not in PDAs
	var/static/regex/soft_ic_outside_pda_filter_regex

	/// An assoc list of blocked IC words to their reasons
	var/static/list/ic_filter_reasons

	/// An assoc list of words that are blocked IC, but not in PDAs, to their reasons
	var/static/list/ic_outside_pda_filter_reasons

	/// An assoc list of words that are blocked both IC and OOC to their reasons
	var/static/list/shared_filter_reasons

	/// An assoc list of soft blocked IC words to their reasons
	var/static/list/soft_ic_filter_reasons

	/// An assoc list of words that are soft blocked IC, but not in PDAs, to their reasons
	var/static/list/soft_ic_outside_pda_filter_reasons

	/// An assoc list of words that are soft blocked both IC and OOC to their reasons
	var/static/list/soft_shared_filter_reasons

	/// A list of configuration errors that occurred during load
	var/static/list/configuration_errors

/datum/controller/configuration/proc/admin_reload()
	if(IsAdminAdvancedProcCall() || !PreConfigReload())
		return

	log_admin("[key_name_admin(usr)] has forcefully reloaded the configuration from disk.")
	message_admins("[key_name_admin(usr)] has forcefully reloaded the configuration from disk.")
	full_wipe()
	Load(world.params[OVERRIDE_CONFIG_DIRECTORY_PARAMETER])

/datum/controller/configuration/proc/PreConfigReload()
	if(reload_in_progress)
		to_chat(usr, span_warning("Another user is already reloading the config!"))
		return FALSE

	reload_in_progress = TRUE
	world.TgsTriggerEvent("tg-PreConfigReload", wait_for_completion = TRUE)
	reload_in_progress = FALSE
	return TRUE

/datum/controller/configuration/proc/Load(_directory)
	if(IsAdminAdvancedProcCall()) //If admin proccall is detected down the line it will horribly break everything.
		return
	if(_directory)
		directory = _directory
	if(entries)
		CRASH("/datum/controller/configuration/Load() called more than once!")
	configuration_errors ||= list()
	InitEntries()
	if(fexists("[directory]/config.txt") && LoadEntries("config.txt") <= 1)
		var/list/legacy_configs = list("game_options.txt", "dbconfig.txt", "comms.txt")
		for(var/I in legacy_configs)
			if(fexists("[directory]/[I]"))
				log_config("No $include directives found in config.txt! Loading legacy [legacy_configs.Join("/")] files...")
				for(var/J in legacy_configs)
					LoadEntries(J)
				break
	if (fexists("[directory]/dev_overrides.txt"))
		LoadEntries("dev_overrides.txt")
	if (fexists("[directory]/ezdb.txt"))
		LoadEntries("ezdb.txt")
	loadmaplist(CONFIG_MAPS_FILE)
	LoadMOTD()
	LoadPolicy()
	LoadChatFilter()
	if(CONFIG_GET(flag/load_jobs_from_txt))
		validate_job_config()
		if(SSjob.initialized) // in case we're reloading from disk after initialization, wanna make sure the changes update in the ongoing shift
			SSjob.load_jobs_from_config()

	if(CONFIG_GET(flag/usewhitelist))
		load_whitelist()

	loaded = TRUE

	if (Master)
		Master.OnConfigLoad()
	process_config_errors()

/datum/controller/configuration/proc/full_wipe()
	if(IsAdminAdvancedProcCall())
		return
	entries_by_type.Cut()
	QDEL_LIST_ASSOC_VAL(entries)
	entries = null
	QDEL_LIST_ASSOC_VAL(maplist)
	maplist = null
	QDEL_NULL(defaultmap)
	configuration_errors?.Cut()

/datum/controller/configuration/Destroy()
	full_wipe()
	config = null

	return ..()

/datum/controller/configuration/proc/log_config_error(error_message)
	configuration_errors += error_message
	log_config(error_message)

/datum/controller/configuration/proc/process_config_errors()
	if(!CONFIG_GET(flag/config_errors_runtime))
		return
	for(var/error_message in configuration_errors)
		stack_trace(error_message)

/datum/controller/configuration/proc/InitEntries()
	var/list/_entries = list()
	entries = _entries
	var/list/_entries_by_type = list()
	entries_by_type = _entries_by_type

	for(var/I in typesof(/datum/config_entry)) //typesof is faster in this case
		var/datum/config_entry/E = I
		if(initial(E.abstract_type) == I)
			continue
		E = new I
		var/esname = E.name
		var/datum/config_entry/test = _entries[esname]
		if(test)
			log_config_error("Error: [test.type] has the same name as [E.type]: [esname]! Not initializing [E.type]!")
			qdel(E)
			continue
		_entries[esname] = E
		_entries_by_type[I] = E

/datum/controller/configuration/proc/RemoveEntry(datum/config_entry/CE)
	entries -= CE.name
	entries_by_type -= CE.type

/datum/controller/configuration/proc/LoadEntries(filename, list/stack = list())
	if(IsAdminAdvancedProcCall())
		return

	var/list/separate_levels = splittext(filename, "/")
	// allows for inheriting our folder from the thing that included us
	var/subfolder = ""
	// do we have an actual directory or is this just one file
	if(length(separate_levels) > 1)
		var/actual_filename = separate_levels[length(separate_levels)]
		// We need to sanitize out .. to ensure filename_to_test doesn't accidentially an infinte loop here
		// Need filename in absolute form
		var/list/parsed_folder_bits = list()
		// look at just the relative directory referenced
		for(var/entry in separate_levels - actual_filename)
			if(entry == ".." && length(parsed_folder_bits))
				parsed_folder_bits.Cut(length(parsed_folder_bits), 0)
			else
				parsed_folder_bits += entry
		if(length(parsed_folder_bits))
			subfolder = "[parsed_folder_bits.Join("/")]/"
		filename = "[subfolder][actual_filename]"

	var/filename_to_test = world.system_type == MS_WINDOWS ? LOWER_TEXT(filename) : filename
	if(filename_to_test in stack)
		log_config_error("Warning: Config recursion detected ([english_list(stack)]), breaking!")
		return
	stack = stack + filename_to_test

	log_config("Loading config file [filename]...")
	var/list/lines = world.file2list("[directory]/[filename]")
	var/list/_entries = entries
	for(var/L in lines)
		L = trim(L)
		if(!L)
			continue

		var/firstchar = L[1]
		if(firstchar == "#")
			continue

		var/lockthis = firstchar == "@"
		if(lockthis)
			L = copytext(L, length(firstchar) + 1)

		var/pos = findtext(L, " ")
		var/entry = null
		var/value = null

		if(pos)
			entry = LOWER_TEXT(copytext(L, 1, pos))
			value = copytext(L, pos + length(L[pos]))
		else
			entry = LOWER_TEXT(L)

		if(!entry)
			continue

		if(entry == "$include")
			if(!value)
				log_config_error("Warning: Invalid $include directive: [value]")
			else
				LoadEntries("[subfolder][value]", stack)
				++.
			continue

		// Reset directive, used for setting a config value back to defaults. Useful for string list config types
		if (entry == "$reset")
			var/datum/config_entry/resetee = _entries[LOWER_TEXT(value)]
			if (!value || !resetee)
				log_config_error("Warning: invalid $reset directive: [value]")
				continue
			resetee.set_default()
			log_config("Reset configured value for [value] to original defaults")
			continue

		var/datum/config_entry/E = _entries[entry]
		if(!E)
			log_config("Unknown setting in configuration: '[entry]'")
			continue

		if(lockthis)
			E.protection |= CONFIG_ENTRY_LOCKED

		if(E.deprecated_by)
			var/datum/config_entry/new_ver = entries_by_type[E.deprecated_by]
			var/new_value = E.DeprecationUpdate(value)
			var/good_update = istext(new_value)
			log_config("Entry [entry] is deprecated and will be removed soon. Migrate to [new_ver.name]![good_update ? " Suggested new value is: [new_value]" : ""]")
			if(!warned_deprecated_configs)
				DelayedMessageAdmins("This server is using deprecated configuration settings. Please check the logs and update accordingly.")
				warned_deprecated_configs = TRUE
			if(good_update)
				value = new_value
				E = new_ver
			else
				warning("[new_ver.type] is deprecated but gave no proper return for DeprecationUpdate()")

		var/validated = E.ValidateAndSet(value)
		if(!validated)
			var/log_message = "Failed to validate setting \"[value]\" for [entry]"
			log_config(log_message)
			stack_trace(log_message)
		else
			if(E.modified && !E.dupes_allowed && E.resident_file == filename)
				log_config_error("Duplicate setting for [entry] ([value], [E.resident_file]) detected! Using latest.")

		E.resident_file = filename

		if(validated)
			E.modified = TRUE

	++.

/datum/controller/configuration/can_vv_get(var_name)
	return (var_name != NAMEOF(src, entries_by_type) || !hiding_entries_by_type) && ..()

/datum/controller/configuration/vv_edit_var(var_name, var_value)
	var/list/banned_edits = list(NAMEOF(src, entries_by_type), NAMEOF(src, entries), NAMEOF(src, directory))
	return !(var_name in banned_edits) && ..()

/datum/controller/configuration/stat_entry(msg)
	msg = "Edit"
	return msg

/datum/controller/configuration/proc/Get(entry_type)
	var/datum/config_entry/E = entry_type
	var/entry_is_abstract = initial(E.abstract_type) == entry_type
	if(entry_is_abstract)
		CRASH("Tried to retrieve an abstract config_entry: [entry_type]")
	E = entries_by_type[entry_type]
	if(!E)
		CRASH("Missing config entry for [entry_type]!")
	if((E.protection & CONFIG_ENTRY_HIDDEN) && IsAdminAdvancedProcCall() && GLOB.LastAdminCalledProc == "Get" && GLOB.LastAdminCalledTargetRef == "[REF(src)]")
		log_admin_private("Config access of [entry_type] attempted by [key_name(usr)]")
		return
	return E.config_entry_value

/datum/controller/configuration/proc/Set(entry_type, new_val)
	var/datum/config_entry/E = entry_type
	var/entry_is_abstract = initial(E.abstract_type) == entry_type
	if(entry_is_abstract)
		CRASH("Tried to set an abstract config_entry: [entry_type]")
	E = entries_by_type[entry_type]
	if(!E)
		CRASH("Missing config entry for [entry_type]!")
	if((E.protection & CONFIG_ENTRY_LOCKED) && IsAdminAdvancedProcCall() && GLOB.LastAdminCalledProc == "Set" && GLOB.LastAdminCalledTargetRef == "[REF(src)]")
		log_admin_private("Config rewrite of [entry_type] to [new_val] attempted by [key_name(usr)]")
		return
	return E.ValidateAndSet("[new_val]")

/datum/controller/configuration/proc/LoadMOTD()
	var/list/motd_contents = list()

	var/list/motd_list = CONFIG_GET(str_list/motd)
	if (motd_list.len == 0 && fexists("[directory]/motd.txt"))
		motd_list = list("motd.txt")

	for (var/motd_file in motd_list)
		if (fexists("[directory]/[motd_file]"))
			motd_contents += file2text("[directory]/[motd_file]")
		else
			log_config("MOTD file [motd_file] didn't exist")
			DelayedMessageAdmins("MOTD file [motd_file] didn't exist")

	motd = motd_contents.Join("\n")

	var/tm_info = GLOB.revdata.GetTestMergeInfo()
	if(motd || tm_info)
		motd = motd ? "[motd]<br>[tm_info]" : tm_info

/*
Policy file should be a json file with a single object.
Value is raw html.

Possible keywords :
Job titles / Assigned roles (ghost spawners for example) : Assistant , Captain , Ash Walker
Mob types : /mob/living/basic/carp
Antagonist types : /datum/antagonist/highlander
Species types : /datum/species/lizard
special keywords defined in _DEFINES/admin.dm

Example config:
{
	JOB_ASSISTANT : "Don't kill everyone",
	"/datum/antagonist/highlander" : "<b>Kill everyone</b>",
	"Ash Walker" : "Kill all spacemans"
}

*/
/datum/controller/configuration/proc/LoadPolicy()
	policy = list()
	var/rawpolicy = file2text("[directory]/policy.json")
	if(rawpolicy)
		var/parsed = safe_json_decode(rawpolicy)
		if(!parsed)
			log_config("JSON parsing failure for policy.json")
			DelayedMessageAdmins("JSON parsing failure for policy.json")
		else
			policy = parsed

/datum/controller/configuration/proc/loadmaplist(filename)
	log_config("Loading config file [filename]...")
	filename = "[directory]/[filename]"
	var/list/Lines = world.file2list(filename)

	var/datum/map_config/currentmap = null
	for(var/t in Lines)
		if(!t)
			continue

		t = trim(t)
		if(length(t) == 0)
			continue
		else if(t[1] == "#")
			continue

		var/pos = findtext(t, " ")
		var/command = null
		var/data = null

		if(pos)
			command = LOWER_TEXT(copytext(t, 1, pos))
			data = copytext(t, pos + length(t[pos]))
		else
			command = LOWER_TEXT(t)

		if(!command)
			continue

		if (!currentmap && command != "map")
			continue

		switch (command)
			if ("map")
				currentmap = load_map_config(data, MAP_DIRECTORY_MAPS)
				if(currentmap.defaulted)
					var/error_message = "Failed to load map config for [data]!"
					log_config(error_message)
					log_mapping(error_message, TRUE)
					currentmap = null
			if ("minplayers","minplayer")
				currentmap.config_min_users = text2num(data)
			if ("maxplayers","maxplayer")
				currentmap.config_max_users = text2num(data)
			if ("weight","voteweight")
				currentmap.voteweight = text2num(data)
			if ("default","defaultmap")
				defaultmap = currentmap
			if ("votable")
				currentmap.votable = TRUE
			if ("endmap")
				LAZYINITLIST(maplist)
				maplist[currentmap.map_name] = currentmap
				currentmap = null
			if ("disabled")
				currentmap = null
			if("feedbacklink")
				if(currentmap.map_name == SSmapping.current_map.map_name)
					SSmapping.current_map.feedback_link = data
			else
				log_config("Unknown command in map vote config: '[command]'")

/datum/controller/configuration/proc/LoadChatFilter()
	if(!fexists("[directory]/word_filter.toml"))
		load_legacy_chat_filter()
		return

	log_config("Loading config file word_filter.toml...")
	var/list/result = rustg_raw_read_toml_file("[directory]/word_filter.toml")
	if(!result["success"])
		var/message = "The word filter is not configured correctly! [result["content"]]"
		log_config(message)
		DelayedMessageAdmins(message)
		return
	var/list/word_filter = json_decode(result["content"])

	ic_filter_reasons = try_extract_from_word_filter(word_filter, "ic")
	ic_outside_pda_filter_reasons = try_extract_from_word_filter(word_filter, "ic_outside_pda")
	shared_filter_reasons = try_extract_from_word_filter(word_filter, "shared")
	soft_ic_filter_reasons = try_extract_from_word_filter(word_filter, "soft_ic")
	soft_ic_outside_pda_filter_reasons = try_extract_from_word_filter(word_filter, "soft_ic_outside_pda")
	soft_shared_filter_reasons = try_extract_from_word_filter(word_filter, "soft_shared")

	update_chat_filter_regexes()

/datum/controller/configuration/proc/load_legacy_chat_filter()
	if (!fexists("[directory]/in_character_filter.txt"))
		return

	log_config("Loading config file in_character_filter.txt...")

	ic_filter_reasons = list()
	ic_outside_pda_filter_reasons = list()
	shared_filter_reasons = list()
	soft_ic_filter_reasons = list()
	soft_ic_outside_pda_filter_reasons = list()
	soft_shared_filter_reasons = list()

	for (var/line in world.file2list("[directory]/in_character_filter.txt"))
		if (!line)
			continue
		if (findtextEx(line, "#", 1, 2))
			continue
		// The older filter didn't apply to PDA
		ic_outside_pda_filter_reasons[line] = "No reason available"

	update_chat_filter_regexes()

/// Will update the internal regexes of the chat filter based on the filter reasons
/datum/controller/configuration/proc/update_chat_filter_regexes()
	ic_filter_regex = compile_filter_regex(ic_filter_reasons + ic_outside_pda_filter_reasons + shared_filter_reasons)
	ic_outside_pda_filter_regex = compile_filter_regex(ic_filter_reasons + shared_filter_reasons)
	ooc_filter_regex = compile_filter_regex(shared_filter_reasons)
	soft_ic_filter_regex = compile_filter_regex(soft_ic_filter_reasons + soft_ic_outside_pda_filter_reasons + soft_shared_filter_reasons)
	soft_ic_outside_pda_filter_regex = compile_filter_regex(soft_ic_filter_reasons + soft_shared_filter_reasons)
	soft_ooc_filter_regex = compile_filter_regex(soft_shared_filter_reasons)

/datum/controller/configuration/proc/try_extract_from_word_filter(list/word_filter, key)
	var/list/banned_words = word_filter[key]

	if (isnull(banned_words))
		return list()
	else if (!islist(banned_words))
		var/message = "The word filter configuration's '[key]' key was invalid, contact someone with configuration access to make sure it's setup properly."
		log_config(message)
		DelayedMessageAdmins(message)
		return list()

	var/list/formatted_banned_words = list()

	for (var/banned_word in banned_words)
		formatted_banned_words[LOWER_TEXT(banned_word)] = banned_words[banned_word]
	return formatted_banned_words

/datum/controller/configuration/proc/compile_filter_regex(list/banned_words)
	if (isnull(banned_words) || banned_words.len == 0)
		return null

	var/static/regex/should_join_on_word_bounds = regex(@"^\w+$")

	// Stuff like emoticons needs another split, since there's no way to get ":)" on a word bound.
	// Furthermore, normal words need to be on word bounds, so "(adminhelp)" gets filtered.
	var/list/to_join_on_whitespace_splits = list()
	var/list/to_join_on_word_bounds = list()

	for (var/banned_word in banned_words)
		if (findtext(banned_word, should_join_on_word_bounds))
			to_join_on_word_bounds += REGEX_QUOTE(banned_word)
		else
			to_join_on_whitespace_splits += REGEX_QUOTE(banned_word)

	// We don't want a whitespace_split part if there's no stuff that requires it
	var/whitespace_split = to_join_on_whitespace_splits.len > 0 ? @"(?:(?:^|\s+)(" + jointext(to_join_on_whitespace_splits, "|") + @")(?:$|\s+))" : ""
	var/word_bounds = @"(\b(" + jointext(to_join_on_word_bounds, "|") + @")\b)"
	var/regex_filter = whitespace_split != "" ? "([whitespace_split]|[word_bounds])" : word_bounds
	return regex(regex_filter, "i")

/// Check to ensure that the jobconfig is valid/in-date.
/datum/controller/configuration/proc/validate_job_config()
	var/config_toml = "[directory]/jobconfig.toml"
	var/config_txt = "[directory]/jobs.txt"
	var/message = "Notify Server Operators: "
	log_config("Validating config file jobconfig.toml...")

	if(!fexists(file(config_toml)))
		SSjob.legacy_mode = TRUE
		message += "jobconfig.toml not found, falling back to legacy mode (using jobs.txt). To suppress this warning, generate a jobconfig.toml by running the verb 'Generate Job Configuration' in the Server tab.\n\
			From there, you can then add it to the /config folder of your server to have it take effect for future rounds."

		if(!fexists(file(config_txt)))
			message += "\n\nFailed to set up legacy mode, jobs.txt not found! Codebase defaults will be used. If you do not wish to use this system, please disable it by commenting out the LOAD_JOBS_FROM_TXT config flag."

		log_config(message)
		DelayedMessageAdmins(span_notice(message))
		return

	var/list/result = rustg_raw_read_toml_file(config_toml)
	if(!result["success"])
		message += "The job config (jobconfig.toml) is not configured correctly! [result["content"]]"
		log_config(message)
		DelayedMessageAdmins(span_notice(message))

//Message admins when you can.
/datum/controller/configuration/proc/DelayedMessageAdmins(text)
	addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(message_admins), text), 0)