import { z } from 'zod';

const schema = z.object({
  NODE_ENV: z.enum(['development', 'test', 'production']).default('development'),
  PORT: z.coerce.number().int().positive().default(3000),
  SESSION_SECRET: z.string().min(16),
  DATABASE_PATH: z.string().min(1).default('./data/truf.db'),
  LOG_LEVEL: z.string().default('info'),
});

export type Config = z.infer<typeof schema>;

export function loadConfig(env: NodeJS.ProcessEnv = process.env): Config {
  const parsed = schema.safeParse(env);
  if (!parsed.success) {
    const issues = parsed.error.issues.map((i) => `${i.path.join('.')}: ${i.message}`).join('; ');
    throw new Error(`Invalid configuration: ${issues}`);
  }
  return parsed.data;
}