import { z } from "zod";

// Server-side environment schema (t3.gg style)
const serverSchema = z.object({
  // Full MySQL connection URL, e.g. mysql://user:pass@host:3306/zxdb
  ZXDB_URL: z
    .string()
    .url()
    .refine((s) => s.startsWith("mysql://"), {
      message: "ZXDB_URL must be a valid mysql:// URL",
    }),

  // Optional file prefixes for ZXDB and WOS
  ZXDB_FILE_PREFIX: z.string().optional(),
  WOS_FILE_PREFIX: z.string().optional(),

  // Local file paths for mirroring
  ZXDB_LOCAL_FILEPATH: z.string().optional(),
  WOS_LOCAL_FILEPATH: z.string().optional(),

  // OIDC Configuration
  OIDC_PROVIDER_URL: z.string().url().optional(),
  OIDC_CLIENT_ID: z.string().optional(),
  OIDC_CLIENT_SECRET: z.string().optional(),

  // Redis cache and SMTP mail URLs
  CACHE_URL: z.string().url().optional(),
  MAIL_URL: z.string().url().optional(),

  // System hostname for permalinks (mandatory)
  HOSTNAME: z.string().min(1),
  PROTO: z.string().startsWith("http"),
});

function formatErrors(errors: z.ZodFormattedError<Map<string, string>, string>) {
  return Object.entries(errors)
    .map(([name, value]) => {
      if (value && "_errors" in value) {
        const errs = (value as z.ZodFormattedError<string>)._errors;
        return `${name}: ${errs.join(", ")}`;
      }
      return `${name}: invalid`;
    })
    .join("\n");
}

const parsed = serverSchema.safeParse(process.env);
if (!parsed.success) {
  // Fail fast with helpful output in server context
  console.error("❌ Invalid environment variables:\n" + formatErrors(parsed.error.format()));
  throw new Error("Invalid environment variables");
}

export const env = parsed.data;