import { recordDebugEvent } from "@mrclrchtr/supi-core/debug";
import type { ProjectServerInfo } from "../config/types.ts";
import { MAX_SERVERS, truncateIdentity } from "../debug-telemetry.ts";
import type { LspRuntimeTransition } from "./runtime-controller.ts";

/** One bounded server entry in a runtime-transition payload. */
export interface TransitionServerEntry {
  readonly name: string;
  readonly status: ProjectServerInfo["status"];
  readonly ready: boolean;
}

/** Bound a project-server snapshot to MAX_SERVERS name/status/ready entries. */
function boundedServerEntries(
  projectServers: readonly ProjectServerInfo[],
): TransitionServerEntry[] {
  return projectServers.slice(0, MAX_SERVERS).map((server) => ({
    name: truncateIdentity(server.name),
    status: server.status,
    ready: server.ready,
  }));
}

/** Record bounded aggregate telemetry for one runtime transition. */
export function recordLspRuntimeTransition(cwd: string, transition: LspRuntimeTransition): void {
  const readyClients = transition.projectServers.filter(
    (server) => server.status === "running" && server.ready,
  ).length;
  const trackedFiles = transition.projectServers.reduce(
    (count, server) => count + server.openFiles.length,
    0,
  );
  recordDebugEvent({
    source: "lsp",
    level: transition.kind === "crash" ? "warning" : "debug",
    category: "runtime.transition",
    message: `LSP runtime transition: ${transition.kind}`,
    cwd: truncateIdentity(cwd),
    data: {
      generation: transition.generation,
      kind: transition.kind,
      semanticReady: transition.semanticReady,
      readyClients,
      totalClients: transition.projectServers.length,
      trackedFiles,
      servers: boundedServerEntries(transition.projectServers),
    },
  });
}