"use client";

import { useEffect, useState } from "react";
import { fetchGroups, fetchAllSignals, Group, Signal } from "../lib/api";

export default function AgentStats() {
  const [groups, setGroups] = useState<Group[]>([]);
  const [signals, setSignals] = useState<Signal[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    async function load() {
      try {
        const [grps, all] = await Promise.all([fetchGroups(), fetchAllSignals()]);
        setGroups(grps);
        setSignals(all.flatMap((g) => g.signals));
      } catch {
        // ignore
      } finally {
        setLoading(false);
      }
    }
    load();
  }, []);

  const totalSignals = groups.reduce((acc, g) => acc + g.signal_count, 0);
  const activeGroups = groups.filter((g) => g.signal_count > 0).length;
  const criticalSignals = signals.filter(
    (s) => s.metadata.severity === "critical" || s.metadata.severity === "high"
  ).length;
  const errorRate =
    totalSignals > 0
      ? `${((criticalSignals / totalSignals) * 100).toFixed(2)}%`
      : "0.00%";

  const stats = [
    {
      title: "Active Groups",
      value: loading ? "—" : `${activeGroups} / ${groups.length}`,
      icon: "memory",
      iconColor: "#a88cfb",
    },
    {
      title: "Total Signals",
      value: loading ? "—" : totalSignals >= 1000 ? `${(totalSignals / 1000).toFixed(1)}k` : String(totalSignals),
      icon: "speed",
      iconColor: "#00daf3",
    },
    {
      title: "High Priority",
      value: loading ? "—" : `${criticalSignals}`,
      icon: "warning",
      iconColor: criticalSignals > 0 ? "#ff6f78" : "#10b981",
    },
    {
      title: "Lens Coverage",
      value: loading ? "—" : `${[...new Set(groups.map((g) => g.lens).filter(Boolean))].length} types`,
      icon: "verified",
      iconColor: "#10b981",
    },
  ];

  return (
    <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6 animate-fade-in-scale mb-8">
      {stats.map((stat, idx) => (
        <div
          key={idx}
          className="glass p-5 rounded-2xl border border-white/5 relative overflow-hidden group card-interactive flex flex-col justify-between"
          style={{
            minHeight: "100px",
            background: "rgba(20,20,25,0.4)",
            backdropFilter: "blur(12px)",
          }}
        >
          <p className="text-[10px] uppercase tracking-widest text-zinc-500 font-mono-data mb-3">
            {stat.title}
          </p>
          <div className="flex flex-row items-end justify-between">
            <h3 className="text-2xl font-light tracking-wide text-zinc-200 font-mono-data drop-shadow">
              {stat.value.split(" ").map((part, i) => (
                <span
                  key={i}
                  className={
                    i % 2 !== 0 && part.match(/[a-zA-Z]/)
                      ? "text-sm ml-1 text-zinc-500"
                      : ""
                  }
                >
                  {part}{" "}
                </span>
              ))}
            </h3>
            <span
              className="material-symbols-outlined text-[24px] opacity-90 drop-shadow-md"
              style={{ color: stat.iconColor }}
            >
              {stat.icon}
            </span>
          </div>
        </div>
      ))}
    </div>
  );
}