import { ref } from "vue";
import {
  createNativeNavigationProfiler,
  type NativeNavigationProfiler,
  type NativeProfilerReport,
  type NativeRouterRuntime,
} from "@native-vue-router/core";
import { pwaBuildId } from "./pwa";

let profiler: NativeNavigationProfiler | undefined;
export const profilerRecording = ref(false);
export const profilerHasCapture = ref(false);

function instance(runtime: NativeRouterRuntime) {
  profiler ??= createNativeNavigationProfiler(runtime, {
    metadata: { app: "nvr-messenger-demo", build: pwaBuildId },
  });
  return profiler;
}

export function startDemoProfile(runtime: NativeRouterRuntime) {
  const active = instance(runtime);
  active.start();
  profilerRecording.value = true;
  profilerHasCapture.value = true;
}

export function stopDemoProfile(runtime: NativeRouterRuntime) {
  const report = instance(runtime).stop();
  profilerRecording.value = false;
  return report;
}

export function snapshotDemoProfile(runtime: NativeRouterRuntime) {
  return instance(runtime).snapshot();
}

export async function shareDemoProfile(
  runtime: NativeRouterRuntime,
  report?: NativeProfilerReport,
) {
  const active = instance(runtime);
  const current =
    report ??
    (profilerRecording.value ? stopDemoProfile(runtime) : active.snapshot());
  const json = active.toJSON(current);
  const stamp = new Date()
    .toISOString()
    .replaceAll(":", "-")
    .replaceAll(".", "-");
  const filename = `native-vue-router-profile-${stamp}.json`;
  const file = new File([json], filename, { type: "application/json" });
  const shareNavigator = navigator as Navigator & {
    canShare?: (data: ShareData) => boolean;
    share?: (data: ShareData) => Promise<void>;
  };

  if (shareNavigator.share && shareNavigator.canShare?.({ files: [file] })) {
    await shareNavigator.share({
      title: "Native Vue Router performance profile",
      text: "Frame pacing and navigation diagnostics. Route params and query values are omitted.",
      files: [file],
    });
    return { report: current, method: "shared" as const };
  }

  const url = URL.createObjectURL(file);
  const link = document.createElement("a");
  link.href = url;
  link.download = filename;
  link.click();
  window.setTimeout(() => URL.revokeObjectURL(url), 1_000);
  return { report: current, method: "downloaded" as const };
}