import { useEffect, useRef } from "react";
import { useLocation, useNavigate } from "react-router-dom";
import {
  CopilotChat,
  useAgent,
  useConfigureSuggestions,
  useCopilotKit,
} from "@copilotkit/react-core/v2";
import { useCopilotAction } from "@copilotkit/react-core";
import { Sparkles } from "lucide-react";
import { SpendingSummaryCard, type SpendingSummaryArgs } from "@/components/chat/ChatCards";

const STATIC_SUGGESTIONS = {
  available: "before-first-message" as const,
  suggestions: [
    { title: "¿Cuál es mi saldo neto hoy?", message: "¿Cuál es mi saldo neto hoy?" },
    { title: "¿Cuánto gasté en el ciclo anterior?", message: "¿Cuánto gasté en el ciclo anterior?" },
    { title: "Últimas 10 transacciones", message: "Muéstrame mis últimas 10 transacciones" },
    { title: "¿Cómo va mi pensión?", message: "¿Cómo va mi pensión?" },
  ],
};

export default function Asistente() {
  useConfigureSuggestions(STATIC_SUGGESTIONS);

  // A question typed on the Inicio dashboard arrives via router state:
  // append it as a user message and run the agent once.
  const location = useLocation();
  const navigate = useNavigate();
  const { agent } = useAgent();
  const { copilotkit } = useCopilotKit();
  const sentRef = useRef(false);
  useEffect(() => {
    const ask = (location.state as { ask?: string } | null)?.ask;
    if (!ask || sentRef.current || !agent) return;
    sentRef.current = true;
    // Clear the state so back/refresh doesn't re-send the question.
    navigate(location.pathname, { replace: true, state: null });
    agent.addMessage({
      id: crypto.randomUUID(),
      role: "user",
      content: ask,
    });
    void copilotkit.runAgent({ agent });
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [agent]);

  useCopilotAction({
    name: "render_spending_summary",
    description:
      "Render a visual spending summary card with source breakdown and category progress bars. " +
      "Call this for any cycle summary, spending totals, or category breakdown.",
    parameters: [
      { name: "title", type: "string", description: "Card title (e.g. 'Ciclo actual')" },
      { name: "period", type: "string", description: "Human-readable period (e.g. '18 mar → 18 abr 2026')" },
      { name: "total_crc", type: "number", description: "Total spend in CRC" },
      {
        name: "by_source",
        type: "object[]",
        description: "Breakdown by payment source",
        attributes: [
          { name: "source", type: "string" },
          { name: "total_crc", type: "number" },
          { name: "count", type: "number" },
        ],
      },
      {
        name: "by_category",
        type: "object[]",
        required: false,
        description: "Top spending categories with CRC amounts",
        attributes: [
          { name: "category", type: "string" },
          { name: "amount_crc", type: "number" },
          { name: "count", type: "number" },
        ],
      },
    ],
    handler: async () => "ok",
    render: (props) => (
      <SpendingSummaryCard args={props.args as SpendingSummaryArgs} status={props.status} />
    ),
  });

  return (
    // Fills the viewport via Layout's flex chain (SidebarInset > main >
    // max-w wrapper are all min-h-0 flex columns) — no vh math.
    <div className="flex flex-1 min-h-0 flex-col">
      <div className="mb-4">
        <h1 className="text-2xl font-bold tracking-tight flex items-center gap-2" style={{ fontFamily: "var(--font-heading)" }}>
          <Sparkles className="w-5 h-5 text-primary" />
          Asistente
        </h1>
        <p className="text-sm text-muted-foreground">
          Pregúntale a WealthySmart sobre tus finanzas.
        </p>
      </div>

      <div className="flex-1 min-h-0 rounded-xl border border-border overflow-hidden bg-card">
        <CopilotChat
          className="h-full"
          labels={{
            modalHeaderTitle: "WealthySmart",
            welcomeMessageText: "¿Qué quieres saber sobre tus finanzas?",
            chatInputPlaceholder: "Escribe tu pregunta…",
          }}
        />
      </div>
    </div>
  );
}