import { existsSync, readFileSync, readdirSync } from "node:fs";
import { hostname } from "node:os";
import { join } from "node:path";
import { agentRelayHome } from "./config";

interface ProviderConfigMigrationPayload {
  host: string;
  configs: Record<string, unknown>;
}

/**
 * Read the host-local per-provider config files (`~/.agent-relay/providers/*.json`)
 * so the relay can seed the central `provider-config` rows with server authority
 * (#465). We stay deliberately dumb here — raw parsed JSON, no defaulting or
 * schema knowledge — because the relay owns provider-config validation/normalization.
 * `host` matches what the runner keys central reads by: bare `os.hostname()`.
 */
export function readLocalProviderConfigs(home = agentRelayHome()): ProviderConfigMigrationPayload {
  const dir = join(home, "providers");
  const configs: Record<string, unknown> = {};
  if (existsSync(dir)) {
    for (const file of readdirSync(dir)) {
      if (!file.endsWith(".json")) continue;
      const provider = file.slice(0, -".json".length);
      if (!provider) continue;
      try {
        const parsed = JSON.parse(readFileSync(join(dir, file), "utf8"));
        if (parsed && typeof parsed === "object" && !Array.isArray(parsed)) configs[provider] = parsed;
      } catch {
        // Skip unparseable files — a malformed local file shouldn't fail the migration.
      }
    }
  }
  return { host: hostname(), configs };
}