"use client";

import { useEffect, useState, useCallback } from "react";
import { motion, AnimatePresence } from "framer-motion";
import { Card, CardHeader, CardTitle, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { useSSE } from "@/hooks/use-sse";

interface FeedItem {
  id: string;
  type: "task" | "online" | "offline";
  lobsterName: string;
  city?: string;
  country?: string;
  summary?: string;
  durationMs?: number;
  timestamp: number;
}

export function LobsterFeed() {
  const [items, setItems] = useState<FeedItem[]>([]);

  const handleEvent = useCallback((event: { type: string; data: Record<string, unknown> }) => {
    if (event.type === "task" || event.type === "online" || event.type === "offline") {
      const newItem: FeedItem = {
        id: `${Date.now()}-${Math.random().toString(36).slice(2)}`,
        type: event.type as FeedItem["type"],
        lobsterName: (event.data.lobsterName as string) ?? "Unknown",
        city: event.data.city as string | undefined,
        country: event.data.country as string | undefined,
        summary: event.data.summary as string | undefined,
        durationMs: event.data.durationMs as number | undefined,
        timestamp: Date.now(),
      };

      setItems((prev) => [newItem, ...prev].slice(0, 50));
    }
  }, []);

  useSSE({
    url: "/api/v1/stream",
    onEvent: handleEvent,
  });

  // Load initial recent tasks
  useEffect(() => {
    const fetchRecent = async () => {
      try {
        const res = await fetch("/api/v1/lobsters?limit=10");
        if (res.ok) {
          const data = await res.json();
          const feedItems: FeedItem[] = (data.lobsters ?? [])
            .filter((l: Record<string, unknown>) => l.lastTask)
            .map((l: Record<string, unknown>) => {
              const task = l.lastTask as Record<string, unknown>;
              return {
                id: `init-${l.id}`,
                type: "task" as const,
                lobsterName: l.name as string,
                city: l.city as string,
                country: l.country as string,
                summary: task.summary as string,
                durationMs: task.durationMs as number,
                timestamp: new Date(task.timestamp as string).getTime(),
              };
            });
          setItems(feedItems);
        }
      } catch {
        // will populate via SSE
      }
    };
    fetchRecent();
  }, []);

  const formatDuration = (ms?: number) => {
    if (!ms) return "";
    if (ms < 1000) return `${ms}ms`;
    return `${(ms / 1000).toFixed(1)}s`;
  };

  const getIcon = (type: string) => {
    switch (type) {
      case "task":
        return "⚡";
      case "online":
        return "🟢";
      case "offline":
        return "⭕";
      default:
        return "🦞";
    }
  };

  return (
    <Card className="border-white/5">
      <CardHeader className="pb-2">
        <CardTitle>Live Feed</CardTitle>
      </CardHeader>
      <CardContent className="max-h-[400px] overflow-y-auto p-4 pt-0">
        <AnimatePresence initial={false}>
          {items.length === 0 ? (
            <p className="py-8 text-center text-xs text-[var(--text-muted)]">
              Waiting for lobster activity...
            </p>
          ) : (
            items.map((item) => (
              <motion.div
                key={item.id}
                initial={{ opacity: 0, height: 0, y: -10 }}
                animate={{ opacity: 1, height: "auto", y: 0 }}
                exit={{ opacity: 0, height: 0 }}
                transition={{ duration: 0.3 }}
                className="border-b border-white/5 py-2.5 last:border-0"
              >
                <div className="flex items-start gap-2">
                  <span className="mt-0.5 text-sm">{getIcon(item.type)}</span>
                  <div className="min-w-0 flex-1">
                    <div className="flex items-center gap-2">
                      <span className="font-mono text-xs font-medium text-[var(--accent-cyan)]">
                        {item.lobsterName}
                      </span>
                      {item.city && (
                        <span className="text-xs text-[var(--text-muted)]">
                          {item.city}, {item.country}
                        </span>
                      )}
                    </div>
                    {item.summary && (
                      <p className="mt-0.5 truncate text-xs text-[var(--text-secondary)]">
                        {item.summary}
                      </p>
                    )}
                    <div className="mt-1 flex items-center gap-2">
                      {item.durationMs && (
                        <Badge variant="secondary">{formatDuration(item.durationMs)}</Badge>
                      )}
                      <span className="text-[10px] text-[var(--text-muted)]">
                        {new Date(item.timestamp).toLocaleTimeString()}
                      </span>
                    </div>
                  </div>
                </div>
              </motion.div>
            ))
          )}
        </AnimatePresence>
      </CardContent>
    </Card>
  );
}