extends Node

signal credits_changed
signal credits_failed(message: String)

const EndpointConfig := preload("res://scripts/autoload/api_endpoint_config.gd")
const DEFAULT_URL := "https://us3q.ranaze.com/api/credits"

var credits: int = 0
var loaded := false
var loading := false
var request: HTTPRequest
var request_token := ""
var api_url := DEFAULT_URL


func _ready() -> void:
	api_url = EndpointConfig.resolve(
		str(ProjectSettings.get_setting("step3/credits_api_url", DEFAULT_URL)),
		"/api/credits")
	request = HTTPRequest.new()
	request.timeout = 20.0
	request.request_completed.connect(_on_completed)
	add_child(request)
	AuthState.auth_changed.connect(_on_auth_changed)


func refresh() -> void:
	if loading or not AuthState.can_send_authenticated_request():
		return
	loading = true
	request_token = AuthState.access_token
	var headers := PackedStringArray(["Authorization: Bearer %s" % request_token])
	var error := request.request(api_url, headers, HTTPClient.METHOD_GET)
	if error != OK:
		loading = false
		credits_failed.emit("Points balance could not be loaded. Check your connection and try again.")


func apply_status(parsed: Dictionary) -> void:
	credits = int(parsed.get("credits", credits))
	loaded = true
	credits_changed.emit()


func _on_completed(result: int, response_code: int, _headers: PackedStringArray, body: PackedByteArray) -> void:
	loading = false
	if response_code == 401:
		AuthState.handle_unauthorized(request_token)
		return
	if result != HTTPRequest.RESULT_SUCCESS or response_code < 200 or response_code >= 300:
		credits_failed.emit("Points balance could not be loaded. Check your connection and try again.")
		return
	var parsed: Variant = JSON.parse_string(body.get_string_from_utf8())
	if typeof(parsed) != TYPE_DICTIONARY:
		credits_failed.emit("The credits service returned an invalid response.")
		return
	apply_status(parsed)


func _on_auth_changed() -> void:
	if not AuthState.is_logged_in:
		credits = 0
		loaded = false
		loading = false
		if request.get_http_client_status() != HTTPClient.STATUS_DISCONNECTED:
			request.cancel_request()