class_name MBWorldProjectIO
extends RefCounted
## Manages serialization and deserialization of local .mbworld project files
## and cloud sync with ModBison backend.

const RECENT_PROJECTS_PATH: String = "user://recent_projects.json"


static func save_project(path: String, project_data: Dictionary) -> bool:
	var fa := FileAccess.open(path, FileAccess.WRITE)
	if fa == null:
		push_error("Failed to open %s for write" % path)
		return false

	var json_str := JSON.stringify(project_data, "  ")
	fa.store_string(json_str)
	fa.close()
	record_recent_project(path)
	return true


static func load_project(path: String) -> Dictionary:
	if not FileAccess.file_exists(path):
		push_error("Project file does not exist: %s" % path)
		return {}

	var fa := FileAccess.open(path, FileAccess.READ)
	if fa == null:
		return {}

	var text := fa.get_as_text()
	fa.close()

	var parsed = JSON.parse_string(text)
	if parsed is Dictionary:
		record_recent_project(path)
		return parsed
	return {}


static func create_template(template_name: String) -> Dictionary:
	var base := {
		"format_version": 1,
		"title": "Untitled World",
		"template": template_name,
		"created_at": Time.get_datetime_string_from_system(),
		"objects": [],
		"tile_layers": [
			{
				"name": "ground",
				"width": 32,
				"height": 32,
				"tiles": []
			}
		],
		"settings": {
			"ambient_color": [0.4, 0.4, 0.45],
			"sky_color": [0.3, 0.6, 0.9],
			"gravity": 9.8
		}
	}

	match template_name.to_lower():
		"baseplate":
			base["title"] = "Baseplate World"
			base["objects"] = [
				{
					"id": "spawn_pad",
					"catalog_id": "crate_small",
					"asset_id": "props/crate_small.glb",
					"position": [0, 0, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [2, 2, 0.2],
					"properties": {"display_name": "Spawn Pad", "catalog_id": "crate_small"}
				},
				{
					"id": "modbison_mascot",
					"catalog_id": "bison",
					"asset_id": "props/bison.glb",
					"position": [0, 4, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [1, 1, 1],
					"properties": {"display_name": "ModBison", "catalog_id": "bison"}
				},
				{
					"id": "crate_base",
					"catalog_id": "crate_small",
					"asset_id": "props/crate_small.glb",
					"position": [4, 0, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [1, 1, 1],
					"properties": {"display_name": "Wooden Crate", "catalog_id": "crate_small"}
				},
				{
					"id": "crate_stacked",
					"catalog_id": "crate_small",
					"asset_id": "props/crate_small.glb",
					"position": [4, 0, 1],
					"rotation": [0, 0, 0, 1],
					"scale": [1, 1, 1],
					"properties": {"display_name": "Stacked Crate", "catalog_id": "crate_small", "parent_id": "crate_base"}
				},
				{
					"id": "lamp_01",
					"catalog_id": "lamp_post_01",
					"asset_id": "props/lamp_post_01.glb",
					"position": [-3, 3, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [1, 1, 1],
					"properties": {"display_name": "Street Lamp", "catalog_id": "lamp_post_01"}
				}
			]
		"terrain":
			base["title"] = "Rolling Hills World"
			base["objects"] = [
				{
					"id": "tree_01",
					"catalog_id": "tree_pine",
					"asset_id": "props/tree_pine_01.glb",
					"position": [4, 4, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [1, 1, 1],
					"properties": {"display_name": "Pine Tree"}
				},
				{
					"id": "bison_01",
					"catalog_id": "bison",
					"asset_id": "props/bison.glb",
					"position": [0, 6, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [1, 1, 1],
					"properties": {"display_name": "Wild Bison"}
				}
			]
		"obby", "platformer":
			base["title"] = "Obby Parkour World"
			base["objects"] = [
				{
					"id": "start_platform",
					"catalog_id": "crate_small",
					"asset_id": "props/crate_small.glb",
					"position": [0, 0, 0],
					"rotation": [0, 0, 0, 1],
					"scale": [3, 3, 0.5],
					"properties": {"display_name": "Start Platform"}
				},
				{
					"id": "moving_plat_01",
					"catalog_id": "crate_small",
					"asset_id": "props/crate_small.glb",
					"position": [0, 6, 1],
					"rotation": [0, 0, 0, 1],
					"scale": [2, 2, 0.3],
					"properties": {
						"display_name": "Moving Elevator",
						"motion": {
							"motion_type": "waypoint",
							"move_speed": 3.0,
							"waypoints": [[0, 6, 1], [0, 6, 6]]
						}
					}
				},
				{
					"id": "goal_platform",
					"catalog_id": "crate_small",
					"asset_id": "props/crate_small.glb",
					"position": [0, 14, 6],
					"rotation": [0, 0, 0, 1],
					"scale": [3, 3, 0.5],
					"properties": {"display_name": "Finish Goal"}
				}
			]

	return base


static func record_recent_project(path: String) -> void:
	var recents: Array = get_recent_projects()
	if path in recents:
		recents.erase(path)
	recents.push_front(path)
	if recents.size() > 10:
		recents.resize(10)
	var fa := FileAccess.open(RECENT_PROJECTS_PATH, FileAccess.WRITE)
	if fa != null:
		fa.store_string(JSON.stringify(recents))
		fa.close()


static func get_recent_projects() -> Array:
	if not FileAccess.file_exists(RECENT_PROJECTS_PATH):
		return []
	var fa := FileAccess.open(RECENT_PROJECTS_PATH, FileAccess.READ)
	if fa == null:
		return []
	var parsed = JSON.parse_string(fa.get_as_text())
	fa.close()
	if parsed is Array:
		return parsed
	return []