import path from "node:path";
import { fileURLToPath } from "node:url";
import { config as loadDotenv } from "dotenv";
import { z } from "zod";

loadDotenv({ quiet: true });
loadDotenv({ path: path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../../.env"), quiet: true });

const OptionalUrlSchema = z.preprocess(
  (value) => (typeof value === "string" && value.trim() === "" ? undefined : value),
  z.string().trim().url().optional()
);

const ChatWebSearchEngineSchema = z.preprocess(
  (value) => {
    if (typeof value !== "string") return value;
    const trimmed = value.trim();
    return trimmed ? trimmed.toLowerCase() : undefined;
  },
  z.enum(["exa", "searxng"]).default("exa")
);

const EnvSchema = z.object({
  PORT: z.coerce.number().int().positive().default(8787),
  HOST: z.string().default("0.0.0.0"),

  // simple bearer-token auth for your personal backend
  ADMIN_TOKEN: z.string().min(20).optional(),

  // provider keys
  OPENAI_API_KEY: z.string().optional(),
  ANTHROPIC_API_KEY: z.string().optional(),
  XAI_API_KEY: z.string().optional(),
  EXA_API_KEY: z.string().optional(),

  // Chat-mode web_search tool configuration. Search mode remains Exa-only for now.
  CHAT_WEB_SEARCH_ENGINE: ChatWebSearchEngineSchema,
  SEARXNG_BASE_URL: OptionalUrlSchema,
}).superRefine((value, ctx) => {
  if (value.CHAT_WEB_SEARCH_ENGINE === "searxng" && !value.SEARXNG_BASE_URL) {
    ctx.addIssue({
      code: "custom",
      path: ["SEARXNG_BASE_URL"],
      message: "SEARXNG_BASE_URL is required when CHAT_WEB_SEARCH_ENGINE=searxng",
    });
  }
});

export type Env = z.infer<typeof EnvSchema>;

export const env: Env = EnvSchema.parse(process.env);