/**
 * Application configuration
 * Centralizes all environment variables and configuration settings
 */

interface BotConfig {
  discord: {
    token: string;
    clientId: string;
    clientSecret: string;
  };
  ai: {
    openRouterApiKey: string;
    model: string;
    classificationModel: string;
    maxTokens: number;
    temperature: number;
  };
  bot: {
    /** Chance of Joel responding without being mentioned (0-1) */
    freeWillChance: number;
    /** Chance of using memories for responses (0-1) */
    memoryChance: number;
    /** Minimum time between random user mentions (ms) */
    mentionCooldown: number;
    /** Chance of mentioning a random user (0-1) */
    mentionProbability: number;
  };
  web: {
    port: number;
    baseUrl: string;
    sessionSecret: string;
  };
}

function getEnvOrThrow(key: string): string {
  const value = Bun.env[key];
  if (!value) {
    throw new Error(`Missing required environment variable: ${key}`);
  }
  return value;
}

function getEnvOrDefault(key: string, defaultValue: string): string {
  return Bun.env[key] ?? defaultValue;
}

export const config: BotConfig = {
  discord: {
    token: getEnvOrThrow("DISCORD_TOKEN"),
    clientId: getEnvOrThrow("DISCORD_CLIENT_ID"),
    clientSecret: getEnvOrThrow("DISCORD_CLIENT_SECRET"),
  },
  ai: {
    openRouterApiKey: getEnvOrThrow("OPENROUTER_API_KEY"),
    model: getEnvOrDefault(
      "AI_MODEL",
      "meta-llama/llama-3.1-70b-instruct"
    ),
    classificationModel: getEnvOrDefault(
      "AI_CLASSIFICATION_MODEL",
      "meta-llama/llama-3.1-8b-instruct:free"
    ),
    maxTokens: parseInt(getEnvOrDefault("AI_MAX_TOKENS", "500")),
    temperature: parseFloat(getEnvOrDefault("AI_TEMPERATURE", "1.2")),
  },
  bot: {
    freeWillChance: 0.02,
    memoryChance: 0.3,
    mentionCooldown: 24 * 60 * 60 * 1000, // 24 hours
    mentionProbability: 0.001,
  },
  web: {
    port: parseInt(getEnvOrDefault("WEB_PORT", "3000")),
    baseUrl: getEnvOrDefault("WEB_BASE_URL", "http://localhost:3000"),
    sessionSecret: getEnvOrDefault("SESSION_SECRET", crypto.randomUUID()),
  },
};