"use client";

import React from "react";
import { useSSE } from "@/lib/use-sse";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { ScrollArea } from "@/components/ui/scroll-area";
import type { ActivityEvent } from "@/lib/types";

const green = { bg: "#22c55e", shadow: "0 0 8px rgba(34, 197, 94, 0.4)" };
const blue = { bg: "#3b82f6", shadow: "0 0 8px rgba(59, 130, 246, 0.4)" };
const amber = { bg: "#f59e0b", shadow: "0 0 8px rgba(245, 158, 11, 0.4)" };
const red = { bg: "#ef4444", shadow: "0 0 8px rgba(239, 68, 68, 0.4)" };
const purple = { bg: "#a855f7", shadow: "0 0 8px rgba(168, 85, 247, 0.4)" };

const typeColors: Record<string, { bg: string; shadow: string }> = {
  stack_healthy: green,
  backup_result: green,
  drift_clean: green,
  cron_complete: green,
  disk_scan_complete: green,
  email_classified: blue,
  email_classifying: blue,
  email_cached: blue,
  start: blue,
  receipt_extracted: amber,
  container_restarted: amber,
  restart_analysis: amber,
  container_unhealthy: red,
  drift_found: red,
  disk_warning: red,
  error: red,
  changelog_generated: purple,
  changelog_commits: purple,
  pr_reviewed: purple,
};
const defaultDot = { bg: "#6b7280", shadow: "none" };

function formatTime(ts: string) {
  try {
    return new Date(ts).toLocaleTimeString("en-US", {
      hour: "2-digit",
      minute: "2-digit",
    });
  } catch {
    return ts;
  }
}

const feedCategoryColors: Record<string, string> = {
  receipts: "text-amber-400",
  newsletters: "text-blue-400",
  accounts: "text-violet-400",
  spam: "text-red-400",
  personal: "text-green-400",
  finance: "text-emerald-400",
  work: "text-cyan-400",
  promotions: "text-amber-400",
  social: "text-purple-400",
};

function getCategoryColor(cat: string): string {
  const lower = cat.toLowerCase();
  for (const [key, cls] of Object.entries(feedCategoryColors)) {
    if (lower.includes(key)) return cls;
  }
  return "text-foreground";
}

function EventMessage({ event }: { event: ActivityEvent }): React.ReactElement {
  switch (event.type) {
    case "email_classified": {
      const cat = String(event.category ?? "?");
      return (
        <span>
          Classified as <span className={getCategoryColor(cat)}>{cat}</span>
          {event.label ? ` - ${String(event.label)}` : ""}
        </span>
      );
    }
    case "email_classifying":
      return <span>[{String(event.progress ?? "?")}] Classifying: {String(event.subject ?? "?")}</span>;
    case "email_cached": {
      const cat = String(event.category ?? "?");
      return (
        <span>
          Cached: {String(event.subject ?? "?")} → <span className={getCategoryColor(cat)}>{cat}</span>
        </span>
      );
    }
    case "receipt_extracted":
      return (
        <span>
          Receipt: {String(event.vendor ?? "?")} <span className="text-green-400">${String(event.amount ?? "?")}</span>
        </span>
      );
    case "container_restarted":
      return (
        <span>
          Restarted <span className="text-cyan-400">{String(event.container)}</span> on {String(event.endpoint)}
        </span>
      );
    case "container_unhealthy":
      return event.container ? (
        <span>
          Unhealthy: <span className="text-cyan-400">{String(event.container)}</span> on {String(event.endpoint)}
        </span>
      ) : (
        <span>{String(event.raw ?? "Unhealthy container detected")}</span>
      );
    case "backup_result":
      return <span>Backup: {String(event.status ?? "?")}</span>;
    case "drift_clean":
      return <span>Config drift check: <span className="text-green-400">all clean</span></span>;
    case "drift_found":
      return <span>Config drift: {String(event.drifts ?? "?")} drifts in {String(event.services ?? "?")} services</span>;
    case "cron_complete":
      return <span>Automation run completed</span>;
    case "stack_healthy":
      return <span>All containers <span className="text-green-400">healthy</span></span>;
    case "disk_warning":
      return <span>Disk warning: {String(event.days)} days remaining</span>;
    case "disk_scan_complete":
      return <span>Disk scan: {String(event.count)} filesystems checked</span>;
    case "pr_reviewed":
      return <span>AI reviewed PR <span className="text-violet-400">#{String(event.pr)}</span></span>;
    case "changelog_generated":
      return <span>Changelog: {String(event.commits)} commits</span>;
    case "changelog_commits":
      return <span>{String(event.count)} new commits found</span>;
    case "restart_analysis":
      return (
        <span>
          LLM says {String(event.decision)} for <span className="text-cyan-400">{String(event.container)}</span>
        </span>
      );
    default: {
      if (typeof event.raw === "string") {
        const cleaned = event.raw.replace(/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},?\d*\s+\S+\s+/, "");
        return <span>{cleaned}</span>;
      }
      return <span>{event.type} from {event.source}</span>;
    }
  }
}

export function ActivityFeed() {
  const events = useSSE("/api/activity");

  return (
    <Card className="overflow-hidden relative">
      <CardHeader className="flex flex-row items-center justify-between pb-2">
        <CardTitle className="text-base font-semibold">Activity Feed</CardTitle>
        <Badge
          variant="outline"
          className="text-[10px] border-green-500/30 text-green-400 animate-live-pulse bg-green-500/5"
        >
          <span className="inline-block w-1.5 h-1.5 rounded-full bg-green-400 mr-1.5 glow-green" />
          LIVE
        </Badge>
      </CardHeader>
      <CardContent>
        <ScrollArea className="h-[220px]">
          {events.length === 0 && (
            <p className="text-xs text-muted-foreground py-4 text-center">
              Waiting for events...
            </p>
          )}
          <div className="space-y-2">
            {events.map((event, i) => (
              <div
                key={`${event.timestamp}-${i}`}
                className="flex items-start gap-3 text-xs animate-slide-in rounded-lg px-2 py-1.5 transition-colors hover:bg-white/[0.03]"
                style={{ animationDelay: `${i * 30}ms` }}
              >
                <span
                  className="w-2.5 h-2.5 rounded-full mt-0.5 shrink-0"
                  style={{
                    background: (typeColors[event.type] ?? defaultDot).bg,
                    boxShadow: (typeColors[event.type] ?? defaultDot).shadow,
                  }}
                />
                <div className="flex-1 min-w-0">
                  <p className="text-foreground truncate">
                    <EventMessage event={event} />
                  </p>
                  <p className="text-muted-foreground/70">
                    {formatTime(event.timestamp)} &middot; {event.source}
                  </p>
                </div>
              </div>
            ))}
          </div>
        </ScrollArea>
      </CardContent>
    </Card>
  );
}