Configuration: recactor how it is written and handled

src/configDefault.ts

@@ -0,0 +1,91 @@
+import { Message } from "discord.js";
+import {
+  ChatCompletionRequestMessage as OpenAIMessage,
+  CreateChatCompletionRequest as ChatCompletionRequestData,
+} from "openai";
+
+export interface IConfigRequired {
+  readonly calendarParams: Intl.DateTimeFormatOptions;
+  /** Tokens to authentiate with */
+  readonly tokens: {
+    readonly Discord: string;
+    readonly OpenAI: string;
+  };
+  /** Messages to append at the start of every chat history when sending to API */
+  systemPrompt(context: Message): OpenAIMessage[];
+  /** OpenAI model config */
+  readonly chatCompletionParams: Omit<ChatCompletionRequestData, "messages" | "function_call" | "functions" | "n">;
+  /** Limits for message selection */
+  readonly readLimits: {
+    /** Maximum message age to include (in miliseconds) */
+    readonly time: number;
+    /** Maximum number of messages to select (maximum 100) */
+    readonly messages: number;
+    /** Maximum total token usage for messages (counted locally) */
+    readonly tokens: number;
+  };
+  /** Default limits for user inteacting with the bot */
+  readonly userLimits: {
+    /** How much requests can an user make if it's not overriden in a database entry */
+    readonly requests: number;
+  };
+}
+
+export type IConfig = Partial<IConfigRequired>;
+
+export default function newConfig(config?: IConfig): IConfigRequired {
+  return { ...defaultConfig, ...config };
+}
+
+function envAsString(key: string): string | undefined {
+  key = key.toLocaleUpperCase();
+  return process.env[key];
+}
+
+function envAsNumber(key: string): number | undefined {
+  key = key.toLocaleUpperCase();
+  const value = Number(process.env[key]);
+  return !Number.isNaN(value) ? value : undefined;
+}
+
+const defaultConfig: IConfigRequired = {
+  calendarParams: {
+    weekday: "short",
+    year: "numeric",
+    month: "short",
+    day: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+    hour12: false,
+  },
+  tokens: {
+    Discord: envAsString("TOKENS__DISCORD") ?? "",
+    OpenAI: envAsString("TOKENS__OPENAI") ?? "",
+  },
+  systemPrompt(): OpenAIMessage[] {
+    return [
+      {
+        role: "system",
+        content:
+          envAsString("SYSTEM_PROMPT") ??
+          `You are GPTcord, an AI built on top of ChatGPT (a large language model trained by OpenAI) for Discord. Answer as concisely as possible.`,
+      },
+    ];
+  },
+  chatCompletionParams: {
+    model: envAsString("CHAT_COMPLETION_PARAMS__MODEL") ?? "gpt-3.5-turbo",
+    max_tokens: envAsNumber("CHAT_COMPLETION_PARAMS__MAX_TOKENS") ?? 384,
+    frequency_penalty: envAsNumber("CHAT_COMPLETION_PARAMS__FREQUENCY_PENALTY"),
+    presence_penalty: envAsNumber("CHAT_COMPLETION_PARAMS__PRESENCE_PENALTY"),
+    temperature: envAsNumber("CHAT_COMPLETION_PARAMS__TEMPERATURE"),
+    top_p: envAsNumber("CHAT_COMPLETION_PARAMS__TOP_P"),
+  },
+  readLimits: {
+    time: envAsNumber("READ_LIMITS__TIME") ?? 60 * 60 * 1000,
+    messages: envAsNumber("READ_LIMITS__MESSAGES") ?? 50,
+    tokens: envAsNumber("READ_LIMITS__TOKENS") ?? 2048,
+  },
+  userLimits: {
+    requests: envAsNumber("USER_LIMITS__REQUESTS") ?? 25,
+  },
+};