extends Node

## 网络服务
## 封装 HTTP 请求，提供统一的网络通信接口

# API 基础 URL
const API_BASE_URL: String = "https://whaletownui.angforever.top"

# 请求超时时间（秒）
const REQUEST_TIMEOUT: float = 30.0

# 最大重试次数
const MAX_RETRY: int = 3

# 是否开启调试日志（显示请求和响应详情）
const DEBUG_MODE: bool = true

## 发送 POST 请求
func post(endpoint: String, data: Dictionary, headers: Array = []) -> Dictionary:
	var url = API_BASE_URL + endpoint
	return await _request(url, HTTPClient.METHOD_POST, data, headers)

## 发送 GET 请求
func sendGet(endpoint: String, headers: Array = []) -> Dictionary:
	var url = API_BASE_URL + endpoint
	return await _request(url, HTTPClient.METHOD_GET, {}, headers)

## 发送带 Token 的 POST 请求
func authenticatedPost(endpoint: String, data: Dictionary) -> Dictionary:
	var tokenData = StorageService.loadToken()
	var token = tokenData.get("token", "")

	if token.is_empty():
		return {
			"success": false,
			"error_code": ErrorCode.TOKEN_INVALID,
			"message": ErrorCode.getMessage(ErrorCode.TOKEN_INVALID)
		}

	var headers = [
		"Authorization: Bearer " + token
	]

	return await post(endpoint, data, headers)

## 核心请求方法
func _request(url: String, method: HTTPClient.Method, data: Dictionary, customHeaders: Array) -> Dictionary:
	# 创建 HTTPRequest 节点
	var httpRequest = HTTPRequest.new()
	add_child(httpRequest)

	# 设置超时
	httpRequest.timeout = REQUEST_TIMEOUT

	# 构建请求头
	var headers = [
		"Content-Type: application/json",
		"Accept: application/json"
	]
	headers.append_array(customHeaders)

	# 准备请求体
	var body = ""
	if method == HTTPClient.METHOD_POST or method == HTTPClient.METHOD_PUT:
		body = JSON.stringify(data)

	# 调试日志：请求信息
	if DEBUG_MODE:
		_logRequest(url, method, headers, body)

	# 发送请求
	var error = httpRequest.request(url, headers, method, body)

	if error != OK:
		httpRequest.queue_free()
		return _createErrorResponse(ErrorCode.NETWORK_ERROR, "发送请求失败")

	# 等待响应
	var result = await httpRequest.request_completed

	# 调试日志：响应信息
	if DEBUG_MODE:
		_logResponse(result)

	# 清理
	httpRequest.queue_free()

	# 解析响应
	return _parseResponse(result)

## 解析 HTTP 响应
func _parseResponse(result: Array) -> Dictionary:
	var httpResult: int = result[0]
	var responseCode: int = result[1]
	var _headers: PackedStringArray = result[2]
	var body: PackedByteArray = result[3]

	# 检查 HTTP 请求错误
	if httpResult != HTTPRequest.RESULT_SUCCESS:
		return _handleHttpError(httpResult)

	# 检查 HTTP 状态码
	if responseCode < 200 or responseCode >= 300:
		return _handleStatusCodeError(responseCode, body)

	# 解析 JSON 响应体
	var bodyString = body.get_string_from_utf8()
	if bodyString.is_empty():
		return _createErrorResponse(ErrorCode.SERVER_ERROR, "服务器返回空响应")

	var json = JSON.new()
	var parseError = json.parse(bodyString)

	if parseError != OK:
		push_error("JSON 解析失败: " + bodyString)
		return _createErrorResponse(ErrorCode.SERVER_ERROR, "响应数据格式错误")

	var responseData = json.data

	# 根据后端API格式解析（通用格式，后续可能需要调整）
	if typeof(responseData) == TYPE_DICTIONARY:
		# 检查是否有 success 字段（新版 API 格式）
		if responseData.has("success"):
			var success = responseData.get("success", false)
			if success:
				return {
					"success": true,
					"data": responseData.get("data", {}),
					"message": responseData.get("message", "操作成功")
				}
			else:
				# 业务错误
				return {
					"success": false,
					"error_code": responseData.get("error_code", ErrorCode.SERVER_ERROR),
					"message": responseData.get("message", "操作失败")
				}
		# 检查是否有 code 字段（旧版 API 格式）
		elif responseData.has("code"):
			var code = responseData.get("code", -1)
			if code == 0 or code == 200:  # 成功
				return {
					"success": true,
					"data": responseData.get("data", {}),
					"message": responseData.get("message", "操作成功")
				}
			else:  # 业务错误
				return {
					"success": false,
					"error_code": code,
					"message": responseData.get("message", "操作失败")
				}
		else:
			# 假设整个响应就是数据
			return {
				"success": true,
				"data": responseData,
				"message": "操作成功"
			}

	return _createErrorResponse(ErrorCode.SERVER_ERROR, "响应格式不正确")

## 处理 HTTP 请求错误
func _handleHttpError(httpResult: int) -> Dictionary:
	match httpResult:
		HTTPRequest.RESULT_TIMEOUT:
			return _createErrorResponse(ErrorCode.TIMEOUT, "请求超时")
		HTTPRequest.RESULT_CONNECTION_ERROR:
			return _createErrorResponse(ErrorCode.NETWORK_ERROR, "网络连接失败")
		HTTPRequest.RESULT_CANT_CONNECT:
			return _createErrorResponse(ErrorCode.NETWORK_ERROR, "无法连接到服务器")
		_:
			return _createErrorResponse(ErrorCode.NETWORK_ERROR, "网络请求失败: " + str(httpResult))

## 处理 HTTP 状态码错误
func _handleStatusCodeError(statusCode: int, body: PackedByteArray) -> Dictionary:
	var bodyString = body.get_string_from_utf8()

	# 尝试解析错误信息
	var json = JSON.new()
	if json.parse(bodyString) == OK:
		var data = json.data
		if typeof(data) == TYPE_DICTIONARY and data.has("message"):
			var message = data.get("message", "")
			# 确保 message 是字符串类型
			if typeof(message) == TYPE_ARRAY:
				message = ", ".join(message)
			elif typeof(message) != TYPE_STRING:
				message = str(message)
			return _createErrorResponse(statusCode, message)

	# 通用状态码错误处理
	match statusCode:
		400:
			return _createErrorResponse(statusCode, "请求参数错误") 
		401:
			return _createErrorResponse(statusCode, "未授权，请重新登录")
		403:
			return _createErrorResponse(statusCode, "没有权限访问")
		404:
			return _createErrorResponse(statusCode, "请求的资源不存在")
		500:
			return _createErrorResponse(statusCode, "服务器内部错误")
		502:
			return _createErrorResponse(statusCode, "网关错误")
		503:
			return _createErrorResponse(statusCode, "服务暂时不可用")
		_:
			return _createErrorResponse(statusCode, "HTTP 错误: " + str(statusCode))

## 创建错误响应
func _createErrorResponse(errorCode: int, message: String) -> Dictionary:
	return {
		"success": false,
		"error_code": errorCode,
		"message": message
	}

## 记录请求日志
func _logRequest(url: String, method: HTTPClient.Method, headers: Array, body: String) -> void:
	print("\n========== HTTP 请求 ==========")
	print("URL: ", url)
	print("方法: ", _getMethodName(method))
	print("请求头:")
	for header in headers:
		print("  ", header)
	if not body.is_empty():
		print("请求体:")
		# 尝试格式化 JSON
		var json = JSON.new()
		if json.parse(body) == OK:
			print("  ", JSON.stringify(json.data, "  "))
		else:
			print("  ", body)
	print("==============================\n")

## 记录响应日志
func _logResponse(result: Array) -> void:
	var httpResult: int = result[0]
	var responseCode: int = result[1]
	var responseHeaders: PackedStringArray = result[2]
	var body: PackedByteArray = result[3]

	print("\n========== HTTP 响应 ==========")
	print("请求结果: ", _getHttpResultName(httpResult))
	print("状态码: ", responseCode)
	print("响应头:")
	for header in responseHeaders:
		print("  ", header)

	var bodyString = body.get_string_from_utf8()
	if not bodyString.is_empty():
		print("响应体:")
		# 尝试格式化 JSON
		var json = JSON.new()
		if json.parse(bodyString) == OK:
			print("  ", JSON.stringify(json.data, "  "))
		else:
			print("  ", bodyString)
	else:
		print("响应体: (空)")
	print("==============================\n")

## 获取 HTTP 方法名称
func _getMethodName(method: HTTPClient.Method) -> String:
	match method:
		HTTPClient.METHOD_GET: return "GET"
		HTTPClient.METHOD_POST: return "POST"
		HTTPClient.METHOD_PUT: return "PUT"
		HTTPClient.METHOD_DELETE: return "DELETE"
		HTTPClient.METHOD_PATCH: return "PATCH"
		_: return "UNKNOWN"

## 获取 HTTP 请求结果名称
func _getHttpResultName(result: int) -> String:
	match result:
		HTTPRequest.RESULT_SUCCESS: return "成功"
		HTTPRequest.RESULT_TIMEOUT: return "超时"
		HTTPRequest.RESULT_CONNECTION_ERROR: return "连接错误"
		HTTPRequest.RESULT_CANT_CONNECT: return "无法连接"
		HTTPRequest.RESULT_NO_RESPONSE: return "无响应"
		_: return "错误 (" + str(result) + ")"