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

dotenv.config({ path: path.join(__dirname, '../../../../.env') });

const envSchema = z.object({
    DATABASE_URL: z.string().url(),
    REDIS_URL: z.string().url(),
    ADMIN_API_KEY: z.string().min(32),
    WHATSAPP_ACCESS_TOKEN: z.string().optional(),
    WHATSAPP_PHONE_NUMBER_ID: z.string().optional(),
    OPENAI_API_KEY: z.string().optional(),
    GOOGLE_AI_API_KEY: z.string().optional(),
    ANTHROPIC_API_KEY: z.string().optional(),
    STRIPE_SECRET_KEY: z.string().optional(),
    STRIPE_WEBHOOK_SECRET: z.string().optional(),
    R2_ACCOUNT_ID: z.string().optional(),
    R2_ACCESS_KEY_ID: z.string().optional(),
    R2_SECRET_ACCESS_KEY: z.string().optional(),
    R2_BUCKET: z.string().optional(),
    PORT: z.string().default('3001').transform(Number),
    NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
    ENCRYPTION_SECRET: z.string().min(32, 'ENCRYPTION_SECRET must be at least 32 characters')
});

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

if (!result.success) {
    console.error('[CONFIG] ❌ Invalid environment variables:', result.error.format());
    throw new Error(`[CONFIG] Missing or invalid environment variables:\n${result.error.message}`);
}

export const config = result.data;