extends RefCounted
## A dedicated server's preferences (`server.json`) and its reserved names
## (`names.json` alongside). Created with defaults on first run and meant to
## be edited by hand; command-line flags override single values for one run.
## See docs/MULTIPLAYER_PLAN.md §4.

const DEFAULT_PATH := "user://server/server.json"
const DEFAULTS := {
	"server_name": "Emberwild server",
	"motd": "Welcome!",
	"port": 24242,
	"max_players": 8,
	"password": "",
	"world": "server-world",
	"worldlet": "valley",
	"seed": 1337,
	"pvp": false,
	"raiding": false,
	"locks": "owner_and_friends",
	"death_penalty": "grave",
	"sleep": "all_online",
	"pause_when_empty": true,
	"day_length_minutes": 20,
	"wolf_grace_days": 3,
	"difficulty": "normal",
	"autosave_minutes": 2,
	"backups_kept": 10,
	"admins": [],
	"allowlist": [],
	"banned": [],
}
## Settings sent to players when they join (never the password or the lists).
const PUBLIC := ["server_name", "motd", "max_players", "worldlet", "pvp", "raiding", "locks",
	"death_penalty", "sleep", "pause_when_empty", "day_length_minutes", "wolf_grace_days", "difficulty"]

var path := DEFAULT_PATH
var data: Dictionary = {}          ## what's in server.json (saved)
var overrides: Dictionary = {}     ## command-line flags for this run (never saved)
## Reserved names: lower-case name -> {"name": as typed, "id": player id}.
var names: Dictionary = {}

static func open(p: String = DEFAULT_PATH) -> RefCounted:
	var c = load("res://scripts/net/server_config.gd").new()
	c.path = p
	DirAccess.make_dir_recursive_absolute(p.get_base_dir())
	var loaded: Variant = JSON.parse_string(FileAccess.get_file_as_string(p)) if FileAccess.file_exists(p) else null
	c.data = DEFAULTS.duplicate(true)
	if loaded is Dictionary:
		for k in loaded:
			c.data[k] = loaded[k]
	else:
		c.save()   # first run: write the defaults so they can be edited
	var n: Variant = JSON.parse_string(FileAccess.get_file_as_string(c.names_path())) \
		if FileAccess.file_exists(c.names_path()) else null
	if n is Dictionary:
		c.names = n
	return c

func names_path() -> String:
	return path.get_base_dir().path_join("names.json")

func save() -> void:
	_write(path, data)

func save_names() -> void:
	_write(names_path(), names)

static func _write(p: String, d: Dictionary) -> void:
	var tmp := p + ".tmp"
	var f := FileAccess.open(tmp, FileAccess.WRITE)
	if f == null:
		push_error("[server] couldn't write %s" % p)
		return
	f.store_string(JSON.stringify(d, "\t"))
	f.close()
	DirAccess.rename_absolute(tmp, p)

## A setting's value for this run (a flag beats the file).
func v(k: String) -> Variant:
	return overrides.get(k, data.get(k))

func public_info() -> Dictionary:
	var out := {}
	for k in PUBLIC:
		out[k] = v(k)
	return out

## The player id holding `n`, or "" if it's free.
func name_owner(n: String) -> String:
	return String(names.get(n.to_lower(), {}).get("id", ""))

## Gives `n` to `id`, releasing any other name that id held.
func reserve_name(n: String, id: String) -> void:
	for k in names.keys():
		if names[k].id == id and k != n.to_lower():
			names.erase(k)
	names[n.to_lower()] = {"name": n, "id": id}
	save_names()

func is_admin(id: String) -> bool:
	return id in data.admins

func add_admin(id: String) -> void:
	if not id in data.admins:
		data.admins.append(id)
		save()