import { z } from "zod";

export const mintelEnvSchema = {
  NODE_ENV: z
    .enum(["development", "production", "test"])
    .default("development"),
  NEXT_PUBLIC_BASE_URL: z.string().url().optional(),
  NEXT_PUBLIC_TARGET: z
    .enum(["development", "testing", "staging", "production"])
    .optional(),
  TARGET: z
    .enum(["development", "testing", "staging", "production"])
    .optional(),

  // Analytics (Proxy Pattern)
  UMAMI_WEBSITE_ID: z.string().optional(),
  NEXT_PUBLIC_UMAMI_WEBSITE_ID: z.string().optional(),
  UMAMI_API_ENDPOINT: z
    .string()
    .url()
    .default("https://analytics.infra.mintel.me"),

  // Error Tracking
  SENTRY_DSN: z.string().optional(),

  // Notifications
  GOTIFY_URL: z.string().url().optional(),
  GOTIFY_TOKEN: z.string().optional(),

  LOG_LEVEL: z
    .enum(["trace", "debug", "info", "warn", "error", "fatal"])
    .default("info"),

  // Mail
  MAIL_HOST: z.string().optional(),
  MAIL_PORT: z.coerce.number().default(587),
  MAIL_USERNAME: z.string().optional(),
  MAIL_PASSWORD: z.string().optional(),
  MAIL_FROM: z.string().optional(),
  MAIL_RECIPIENTS: z.preprocess(
    (val) => (typeof val === "string" ? val.split(",").filter(Boolean) : val),
    z.array(z.string()).default([]),
  ),

  // Directus
  DIRECTUS_URL: z.string().url().default("http://localhost:8055"),
  DIRECTUS_ADMIN_EMAIL: z.string().optional(),
  DIRECTUS_ADMIN_PASSWORD: z.string().optional(),
  DIRECTUS_API_TOKEN: z.string().optional(),
  INTERNAL_DIRECTUS_URL: z.string().url().optional(),
};

export function validateMintelEnv<
  T extends z.ZodRawShape = Record<string, never>,
>(
  schemaExtension: T = {} as T,
): z.infer<z.ZodObject<typeof mintelEnvSchema & T>> {
  const fullSchema = z.object(mintelEnvSchema).extend(schemaExtension);

  const isBuildTime =
    process.env.NEXT_PHASE === "phase-production-build" ||
    process.env.SKIP_ENV_VALIDATION === "true";

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

  if (!result.success) {
    if (isBuildTime) {
      console.warn(
        "⚠️ Some environment variables are missing during build, but skipping strict validation.",
      );
      // Return process.env casted to ensure types match for the full schema
      return process.env as unknown as z.infer<typeof fullSchema>;
    }

    console.error(
      "❌ Invalid environment variables:",
      result.error.flatten().fieldErrors,
    );
    throw new Error("Invalid environment variables");
  }

  return result.data as z.infer<typeof fullSchema>;
}