src/config.ts

import { config } from 'dotenv';
import { z } from 'zod';

// Load variables from .env into process.env
config();

const envSchema = z.object({
    TELEGRAM_BOT_TOKEN: z.string().min(1, 'TELEGRAM_BOT_TOKEN is required'),
    TELEGRAM_USER_ID: z.string().min(1, 'TELEGRAM_USER_ID is required').transform(Number),
    WEBHOOK_URL: z.string().transform(s => s.trim()).optional(),
    API_BEARER_TOKEN: z.string().transform(s => s.trim()).optional(),
    // LLM provider selection
    LLM_PROVIDER: z.string().transform(s => s.trim()).default('gemini-web'),
    // Optional API keys (validated at runtime by each provider)
    GEMINI_API_KEY: z.string().optional().default(''),
    OPENAI_API_KEY: z.string().optional().default(''),
    OPENAI_BASE_URL: z.string().optional().default('https://api.openai.com/v1'),
    OLLAMA_BASE_URL: z.string().optional().default('http://localhost:11434'),
    // ntfy.sh push notifications
    NTFY_TOPIC: z.string().optional().default(''),
    NTFY_SERVER: z.string().optional().default('https://ntfy.sh'),
    // MongoDB Atlas
    MONGODB_URI: z.string().min(1, 'MONGODB_URI is required for the cloud migration').transform(s => s.trim()),
});

const envParse = envSchema.safeParse(process.env);

if (!envParse.success) {
    console.error('❌ Invalid or missing environment variables:');
    console.error(envParse.error.format());
    process.exit(1);
}

export const env = envParse.data;