extends Node
## Autoload "Boot", first in the list: one-off start-up housekeeping that has
## to happen before anything reads user://.
##
## The game was called "Valheimlike" until it became "Emberwild". Godot names
## the user-data folder after the project, so the rename moved it from
## .../app_userdata/Valheimlike to .../app_userdata/Emberwild. The first time
## Emberwild starts, this copies saved worlds, your identity (key, name, look)
## and server settings across. It copies rather than moves, so the old folder
## stays as a backup, and it never overwrites anything already in the new
## folder. Test folders (test_*) and logs are skipped.

const OLD_NAME := "Valheimlike"
const MARKER := "migrated_from_valheimlike.txt"
const SKIP := ["logs", "shader_cache", "vulkan", "test_worlds", "test_net"]

var copied := 0

func _enter_tree() -> void:
	migrate_user_data()

## Returns the number of files copied (0 if there was nothing to do).
func migrate_user_data() -> int:
	var new_dir := OS.get_user_data_dir()
	var old_dir := new_dir.get_base_dir().path_join(OLD_NAME)
	if new_dir == old_dir or not DirAccess.dir_exists_absolute(old_dir):
		return 0
	if FileAccess.file_exists(new_dir.path_join(MARKER)):
		return 0
	copied = 0
	_copy_tree(old_dir, new_dir)
	var f := FileAccess.open(new_dir.path_join(MARKER), FileAccess.WRITE)
	if f != null:
		f.store_string("Copied %d files from %s on %s. The old folder was left as it was.\n" % [
			copied, old_dir, Time.get_datetime_string_from_system()])
	if copied > 0:
		print("[boot] moved to the new name: copied %d files from %s" % [copied, old_dir])
	return copied

func _copy_tree(from: String, to: String) -> void:
	DirAccess.make_dir_recursive_absolute(to)
	var da := DirAccess.open(from)
	if da == null:
		return
	for f in da.get_files():
		var dst := to.path_join(f)
		if not FileAccess.file_exists(dst) and DirAccess.copy_absolute(from.path_join(f), dst) == OK:
			copied += 1
	for d in da.get_directories():
		if d in SKIP or d.begins_with("test_"):
			continue
		_copy_tree(from.path_join(d), to.path_join(d))