import { useCallback, useEffect, useState } from "react";
import { desktopAction, request } from "./api";

export interface EnvironmentStep { id: string; state: string; detail: string }
export interface EnvironmentRun { schema: string; profile_revision: string; run_id: string; state: string; updated_at: number; steps: EnvironmentStep[] }
export interface EnvironmentStatus { available: boolean; profile: {revision: string; steps:{id:string;label:string;description:string}[]}; run: EnvironmentRun | null }

export function useEnvironment(authorized: boolean, failure: (error: unknown) => void) {
  const [value, setValue] = useState<EnvironmentStatus | null>(null);
  const [pending, setPending] = useState(false);
  const [loading, setLoading] = useState(false);
  const refresh = useCallback(async () => {
    setLoading(true);
    try {setValue(await request<EnvironmentStatus>("/api/environment"));}
    catch(error) {failure(error);}
    finally {setLoading(false);}
  },[failure]);
  // Native progress survives a service restart and never depends on a stale
  // HTTP session. Reopening an existing run uses the read-only status API.
  useEffect(() => {
    function progress(event:Event) {
      const run=(event as CustomEvent<EnvironmentRun>).detail;
      if(run?.schema==="missioncore.node.environment/v1") setValue(current=>current?{...current,available:true,run}:current);
    }
    function complete(event:Event) {
      const result=(event as CustomEvent<{ok:boolean;error?:string;reloading?:boolean}>).detail;
      if(!result?.reloading) setPending(false);
      if(result?.error) failure(new Error(result.error));
      // The native launcher renews login after service changes. No immediate
      // request with the expired cookie is made here.
    }
    const sessionReady=()=>setPending(false);
    window.addEventListener("mission-core-session-ready",sessionReady);
    window.addEventListener("mission-core-environment-progress",progress);
    window.addEventListener("mission-core-environment-result",complete);
    return()=>{window.removeEventListener("mission-core-session-ready",sessionReady);window.removeEventListener("mission-core-environment-progress",progress);window.removeEventListener("mission-core-environment-result",complete);};
  },[failure]);
  useEffect(()=>{if(authorized&&!pending) void refresh();},[authorized,pending,refresh]);
  useEffect(()=>{
    if(!authorized||pending||value?.run?.state!=="running") return;
    const timer=setTimeout(()=>void refresh(),2000);return()=>clearTimeout(timer);
  },[authorized,pending,value,refresh]);
  function start() {
    if(pending||value?.run?.state==="running") return;
    if(!desktopAction("configure-system")) {failure(new Error("Откройте установленное приложение Node для настройки окружения."));return;}
    setValue(current=>current?{...current,run:null}:current);
    setPending(true);
  }
  return {value,pending,loading,refresh,start,running:pending||value?.run?.state==="running"};
}