import { useState } from "react";
import { createFileRoute, useNavigate } from "@tanstack/react-router";
import { AlertCircle } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Skeleton } from "@/components/Skeleton";
import { toast } from "sonner";
import { trpc } from "@/lib/trpc";
import { InitiativeHeader } from "@/components/InitiativeHeader";
import { ContentTab } from "@/components/editor/ContentTab";
import { ExecutionTab } from "@/components/ExecutionTab";
import { useSubscriptionWithErrorHandling } from "@/hooks";

export const Route = createFileRoute("/initiatives/$id")({
  component: InitiativeDetailPage,
});

type Tab = "content" | "execution";

function InitiativeDetailPage() {
  const { id } = Route.useParams();
  const navigate = useNavigate();
  const [activeTab, setActiveTab] = useState<Tab>("content");

  // Live updates: keep subscriptions at page level so they work across both tabs
  const utils = trpc.useUtils();

  // Task updates subscription with robust error handling
  useSubscriptionWithErrorHandling(
    () => trpc.onTaskUpdate.useSubscription(undefined),
    {
      onData: () => {
        void utils.listPhases.invalidate();
        void utils.listTasks.invalidate();
        void utils.listPlans.invalidate();
      },
      onError: (error) => {
        toast.error("Live updates disconnected. Refresh to reconnect.", {
          id: "sub-error",
          duration: Infinity,
        });
        console.error('Task updates subscription error:', error);
      },
      onStarted: () => toast.dismiss("sub-error"),
      autoReconnect: true,
      maxReconnectAttempts: 5,
    }
  );

  // Agent updates subscription with robust error handling
  useSubscriptionWithErrorHandling(
    () => trpc.onAgentUpdate.useSubscription(undefined),
    {
      onData: () => {
        void utils.listAgents.invalidate();
      },
      onError: (error) => {
        toast.error("Live updates disconnected. Refresh to reconnect.", {
          id: "sub-error",
          duration: Infinity,
        });
        console.error('Agent updates subscription error:', error);
      },
      onStarted: () => toast.dismiss("sub-error"),
      autoReconnect: true,
      maxReconnectAttempts: 5,
    }
  );

  // Page updates subscription with robust error handling
  useSubscriptionWithErrorHandling(
    () => trpc.onPageUpdate.useSubscription(undefined),
    {
      onData: () => {
        void utils.listPages.invalidate();
        void utils.getPage.invalidate();
        void utils.getRootPage.invalidate();
      },
      onError: (error) => {
        toast.error("Live updates disconnected. Refresh to reconnect.", {
          id: "sub-error",
          duration: Infinity,
        });
        console.error('Page updates subscription error:', error);
      },
      onStarted: () => toast.dismiss("sub-error"),
      autoReconnect: true,
      maxReconnectAttempts: 5,
    }
  );

  // tRPC queries
  const initiativeQuery = trpc.getInitiative.useQuery({ id });
  const phasesQuery = trpc.listPhases.useQuery(
    { initiativeId: id },
    { enabled: !!initiativeQuery.data },
  );

  // Loading state
  if (initiativeQuery.isLoading) {
    return (
      <div className="space-y-6">
        <div className="flex items-center gap-4">
          <Skeleton className="h-4 w-4" />
          <Skeleton className="h-7 w-64" />
          <Skeleton className="h-5 w-20" />
        </div>
        <div className="grid grid-cols-1 gap-6 lg:grid-cols-[1fr_340px]">
          <div className="space-y-1">
            <Skeleton className="h-12 w-full rounded border" />
            <Skeleton className="h-12 w-full rounded border" />
          </div>
          <div className="space-y-6">
            <Skeleton className="h-24 w-full rounded" />
            <Skeleton className="h-20 w-full rounded" />
          </div>
        </div>
      </div>
    );
  }

  // Error state
  if (initiativeQuery.isError) {
    return (
      <div className="flex flex-col items-center justify-center gap-4 py-12">
        <AlertCircle className="h-8 w-8 text-destructive" />
        <p className="text-sm text-destructive">
          {initiativeQuery.error.message.includes("not found")
            ? "Initiative not found"
            : `Failed to load initiative: ${initiativeQuery.error.message}`}
        </p>
        <Button
          variant="outline"
          size="sm"
          onClick={() => navigate({ to: "/initiatives" })}
        >
          Back to Dashboard
        </Button>
      </div>
    );
  }

  const initiative = initiativeQuery.data;
  if (!initiative) return null;

  const serializedInitiative = {
    id: initiative.id,
    name: initiative.name,
    status: initiative.status,
  };

  const projects = (initiative as { projects?: Array<{ id: string; name: string; url: string }> }).projects;

  const phases = phasesQuery.data ?? [];

  return (
    <div className="space-y-3">
      {/* Header */}
      <InitiativeHeader
        initiative={serializedInitiative}
        projects={projects}
        onBack={() => navigate({ to: "/initiatives" })}
      />

      {/* Tab bar */}
      <div className="flex gap-1 border-b border-border">
        <button
          onClick={() => setActiveTab("content")}
          className={`px-4 py-2 text-sm font-medium border-b-2 transition-colors ${
            activeTab === "content"
              ? "border-primary text-foreground"
              : "border-transparent text-muted-foreground hover:text-foreground"
          }`}
        >
          Content
        </button>
        <button
          onClick={() => setActiveTab("execution")}
          className={`px-4 py-2 text-sm font-medium border-b-2 transition-colors ${
            activeTab === "execution"
              ? "border-primary text-foreground"
              : "border-transparent text-muted-foreground hover:text-foreground"
          }`}
        >
          Execution
        </button>
      </div>

      {/* Tab content */}
      {activeTab === "content" && <ContentTab initiativeId={id} initiativeName={initiative.name} />}
      {activeTab === "execution" && (
        <ExecutionTab
          initiativeId={id}
          phases={phases}
          phasesLoading={phasesQuery.isLoading}
          phasesLoaded={phasesQuery.isSuccess}
        />
      )}
    </div>
  );
}