# (c) 2023-present Eroax
# (c) 2023-present Yagich
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
extends Node
class_name NodeDB_

## Filepath used for referencing all [DeckNode] Files from.
const BASE_NODE_PATH := "res://classes/deck/nodes/"
## Filepath where an Index of [NodeDB_.NodeDescriptor]s are saved to avoid reloading
## everything each run.
## @experimental
const NODE_INDEX_CACHE_PATH := "user://nodes_index.json"
## Filepath where the the list of Favorite Nodes is stored.
const FAVORITE_NODES_PATH := "user://favorite_nodes.json"

## [Array] used for storing all the "Favorite" Nodes that were set in the [AddNodeMenu]
var favorite_nodes: Array[String]

# Dictionary[node_type, NodeDescriptor]
## [Dictionary] filled with node_type, or [String] keys.  Correlating to
## [NodeDB_.NodeDescriptor]'s.  Essentially where all the nodes are loaded in for data reference.
var nodes: Dictionary = {}

## Loads in all the [DeckNode]s from [member BASE_NODE_PATH].  Or if a working
## cache exists at [member NODE_INDEX_CACHE_PATH] that takes priority
func _init() -> void:
	load_favorites()
	#if load_node_index():
		#return

	create_descriptors(BASE_NODE_PATH)

	save_node_index()


func create_descriptors(path: String) -> void:
	var dir := DirAccess.open(path)
	dir.list_dir_begin()
	var current_file := dir.get_next()
	while current_file != "":
		if dir.current_is_dir():
			create_descriptors(path.path_join(current_file))
		else:
			if current_file.ends_with(".gd"):
				var script_path := path.path_join(current_file)
				var node: DeckNode = load(script_path).new() as DeckNode
				var aliases: String = node.aliases.reduce(
					func(accum, el) -> void:
						accum += el
				, "")
				var descriptor := NodeDescriptor.new(
					script_path,
					node.name,
					node.node_type,
					node.description,
					aliases,
					path.get_slice("/", path.get_slice_count("/") - 1),
					node.appears_in_search,
					)
				nodes[node.node_type] = descriptor
		current_file = dir.get_next()


## Helper Function that instances a [DeckNode] based off of it's [member DeckNode.node_type]
func instance_node(type: String) -> DeckNode:
	if !nodes.has(type):
		return null

	return load(nodes[type]["script_path"]).new()

## Handles Saving the Index of all loaded nodes to [member NODE_INDEX_CACHE_PATH]
func save_node_index() -> void:
	var d := {}
	for node_type in nodes:
		var nd: NodeDescriptor = nodes[node_type] as NodeDescriptor
		d[node_type] = nd.to_dictionary()

	var json := JSON.stringify(d, "\t")
	var f := FileAccess.open(NODE_INDEX_CACHE_PATH, FileAccess.WRITE)
	f.store_string(json)

## Loads the Node Index from [member NODE_INDEX_CACHE_PATH] adding all of the
## [NodeDB_.NodeDescriptor]s in it to the [member nodes] [Dictionary]
func load_node_index() -> bool:
	var f := FileAccess.open(NODE_INDEX_CACHE_PATH, FileAccess.READ)
	if f == null:
		DeckHolder.logger.log_system("node index file does not exist", Logger.LogType.ERROR)
		return false

	var data: Dictionary = JSON.parse_string(f.get_as_text()) as Dictionary
	if data.is_empty():
		DeckHolder.logger.log_system("node index file exists, but is empty",  Logger.LogType.ERROR)
		return false

	for node_type in data:
		var nd_dict: Dictionary = data[node_type]
		var nd := NodeDescriptor.from_dictionary(nd_dict)
		nodes[node_type] = nd

	DeckHolder.logger.log_system("node index file exists, loaded")
	return true

## Sets a specific [member DeckNode.node_type] to be a "favorite" for use in
## [AddNodeMenu]. Then stores the updated list of favorites at [member FAVORITE_NODES_PATH]
func set_node_favorite(node_type: String, favorite: bool) -> void:
	if (favorite && node_type in favorite_nodes) || (!favorite && !(node_type in favorite_nodes)):
		return

	if favorite:
		favorite_nodes.append(node_type)
	else:
		favorite_nodes.erase(node_type)

	var f := FileAccess.open(FAVORITE_NODES_PATH, FileAccess.WRITE)
	f.store_string(JSON.stringify(favorite_nodes, "\t"))

## Loads the list of Favorite [memeber DeckNode.node_type]s from [member FAVORITE_NODES_PATH]
func load_favorites() -> void:
	var f := FileAccess.open(FAVORITE_NODES_PATH, FileAccess.READ)
	if !f:
		return
	var data: Array = JSON.parse_string(f.get_as_text())
	favorite_nodes.clear()
	favorite_nodes.assign(data)

## Returns [code]true[/code] if the specified [member DeckNode.node_type] is marked Favorite
## by the user.
func is_node_favorite(node_type: String) -> bool:
	return node_type in favorite_nodes

## Used for storing the shorthand data of a [DeckNode].
##
## Allows for more simply storing [DeckNode]s properties without needing to
## keep an instance
class NodeDescriptor:
	## Default Name of the [DeckNode] type this is storing properties of.
	var name: String
	## The [member DeckNode.node_type] of the [DeckNode] this is based off of.
	var type: String
	## The description of the [DeckNode] reference [member DeckNode.description]
	var description: String
	## The description of the [DeckNode] reference [member DeckNode.aliases]
	var aliases: String
	## The description of the [DeckNode] reference [member DeckNode.category]
	var category: String
	## The description of the [DeckNode] reference [member DeckNode.appears_in_search]
	var appears_in_search: bool

	## Stores the path to this nodes [Script] in res:// for later instantiation.
	var script_path: String

	func _init(
			p_script_path: String,
			p_name: String,
			p_type: String,
			p_description: String,
			p_aliases: String,
			p_category: String,
			p_appears_in_search: bool,
		) -> void:
			script_path = p_script_path

			name = p_name
			type = p_type
			description = p_description
			aliases = p_aliases
			category = p_category
			appears_in_search = p_appears_in_search

	## Converts all the properties in this [NodeDB_.NodeDescriptor] to a [Dictionary]. Format - {propery : value}
	func to_dictionary() -> Dictionary:
		var d := {
			"name": name,
			"type": type,
			"description": description,
			"aliases": aliases,
			"script_path": script_path,
			"category": category,
			"appears_in_search": appears_in_search,
		}
		return d

	## Creates a [NodeDB_.NodeDescriptor] from a given [Dictionary] of properties.
	static func from_dictionary(data: Dictionary) -> NodeDescriptor:
		var nd := NodeDescriptor.new(
			data.get("script_path", ""),
			data.get("name", ""),
			data.get("type", ""),
			data.get("description", ""),
			data.get("aliases", ""),
			data.get("category", ""),
			data.get("appears_in_search", false),
			)

		return nd