import { z } from "zod";

/**
 * Base fields required regardless of Gitea integration mode.
 */
const BaseSchema = z.object({
  netbirdApiUrl: z.string().url(),
  netbirdApiToken: z.string().min(1),
  giteaEnabled: z.string().default("true").transform((v) => v === "true"),
  reconcilerToken: z.string().min(1),
  pollIntervalSeconds: z.coerce.number().int().positive().default(30),
  port: z.coerce.number().int().positive().default(8080),
  dataDir: z.string().default("/data"),
  stateFile: z.string().default("netbird.json"),
});

const GiteaFieldsSchema = z.object({
  giteaUrl: z.string().url(),
  giteaToken: z.string().min(1),
  giteaRepo: z.string().regex(/^[^/]+\/[^/]+$/), // owner/repo
});

/**
 * When giteaEnabled=true, Gitea fields are validated and required.
 * When giteaEnabled=false, Gitea fields are ignored.
 *
 * The output type always includes the optional Gitea fields so
 * downstream code can check `config.giteaEnabled` and narrow.
 */
const ConfigSchema = BaseSchema.merge(GiteaFieldsSchema.partial())
  .superRefine((data, ctx) => {
    if (!data.giteaEnabled) return;

    if (!data.giteaUrl) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: "GITEA_URL is required when GITEA_ENABLED=true",
        path: ["giteaUrl"],
      });
    }
    if (!data.giteaToken) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: "GITEA_TOKEN is required when GITEA_ENABLED=true",
        path: ["giteaToken"],
      });
    }
    if (!data.giteaRepo) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: "GITEA_REPO is required when GITEA_ENABLED=true",
        path: ["giteaRepo"],
      });
    }
  });

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

export function loadConfig(): Config {
  return ConfigSchema.parse({
    netbirdApiUrl: Deno.env.get("NETBIRD_API_URL"),
    netbirdApiToken: Deno.env.get("NETBIRD_API_TOKEN"),
    giteaEnabled: Deno.env.get("GITEA_ENABLED"),
    giteaUrl: Deno.env.get("GITEA_URL"),
    giteaToken: Deno.env.get("GITEA_TOKEN"),
    giteaRepo: Deno.env.get("GITEA_REPO"),
    reconcilerToken: Deno.env.get("RECONCILER_TOKEN"),
    pollIntervalSeconds: Deno.env.get("POLL_INTERVAL_SECONDS"),
    port: Deno.env.get("PORT"),
    dataDir: Deno.env.get("DATA_DIR"),
    stateFile: Deno.env.get("STATE_FILE"),
  });
}