import {
  DollarSign,
  Flame,
  FlaskConical,
  Handshake,
  Landmark,
  Palette,
  Radar,
  Swords,
  Users,
  type LucideIcon,
} from 'lucide-react';
import { Badge } from './ui/badge';
import { ScrollArea } from './ui/scroll-area';
import { EVENT_COLORS, OUTCOME_COLORS } from '@/lib/colors';
import { nationColor } from '@shared/protocol';
import type { EventEntry, EventType, Nation } from '@shared/types';

/** One icon per event category, so a type is readable without reading. */
const EVENT_ICONS: Record<EventType, LucideIcon> = {
  military: Swords,
  diplomatic: Handshake,
  economic: DollarSign,
  political: Landmark,
  social: Users,
  disaster: Flame,
  scientific: FlaskConical,
  cultural: Palette,
};

interface Props {
  events: EventEntry[];
  nations: Record<string, Nation>;
  /**
   * Render without the outer chrome and the built-in header (the surrounding
   * floating window provides the border, the "Event feed" title, and the count
   * badge). Same content, same testids.
   */
  inWindow?: boolean;
}

/**
 * A scrolling event log, newest first. Each event is a card with a category
 * icon, a color-coded outcome badge, a nation-colored accent edge, and the turn
 * + date it resolved on. New events slide in and flash briefly at the top.
 */
export default function EventFeed({ events, nations, inWindow = false }: Props) {
  const latestFirst = [...events].reverse();

  const header = inWindow ? null : (
    <div className="flex items-center justify-between border-b px-4 py-2.5">
      <div className="flex items-center gap-2">
        <Radar className="size-4 text-primary" />
        <h2 className="text-sm font-semibold tracking-wide">Event feed</h2>
      </div>
      <Badge variant="secondary" className="text-xs tabular-nums">
        {events.length}
      </Badge>
    </div>
  );

  return (
    <div
      className={
        inWindow
          ? 'flex h-full min-h-0 flex-col'
          : 'flex h-full min-h-0 flex-col rounded-xl border bg-card'
      }
      data-testid="event-feed-panel"
    >
      {header}

      <ScrollArea className={inWindow ? 'min-h-0 flex-1' : 'mx-3 mb-3 min-h-0 flex-1'}>
        <div className="space-y-2 p-3 pr-1" data-testid="event-feed">
          {latestFirst.length === 0 && (
            <div className="mt-3 rounded-md border border-dashed p-4 text-center text-sm text-muted-foreground">
              No events yet. Take an action, send a message, or jump forward to move the world.
            </div>
          )}

          {latestFirst.map((e) => {
            const nation = nations[e.nation];
            // Accent edge uses the nation's stable choropleth color (falls back to
            // the type color if the nation is missing — never crashes).
            const accent = nation ? nationColor(e.nation) : EVENT_COLORS[e.type] ?? '#94a3b8';
            const typeColor = EVENT_COLORS[e.type] ?? '#94a3b8';
            const outcomeColor = OUTCOME_COLORS[e.outcome] ?? '#94a3b8';
            const Icon = EVENT_ICONS[e.type] ?? Landmark;
            return (
              <article
                key={e.id}
                className="event-new relative overflow-hidden rounded-lg border bg-card/50 p-3 pl-4"
                style={{ borderLeft: `3px solid ${accent}` }}
                data-testid="event-item"
              >
                <div className="mb-1.5 flex items-center gap-1.5 text-[11px] text-muted-foreground">
                  <span className="font-semibold tabular-nums text-foreground/70">T{e.turn}</span>
                  <span>·</span>
                  <span className="tabular-nums">{e.date}</span>
                  <span
                    className="ml-auto inline-flex items-center gap-1.5 rounded-full px-1.5 py-0.5"
                    style={{ color: typeColor, background: `${typeColor}1a` }}
                  >
                    <Icon className="size-3" data-testid="event-type-icon" aria-hidden />
                    <span data-testid="event-type" className="capitalize">
                      {e.type}
                    </span>
                  </span>
                </div>
                <p className="text-sm font-medium leading-snug">{e.title}</p>
                <p className="mt-1 text-[13px] leading-snug text-foreground/75">{e.text}</p>
                <div className="mt-2 flex items-center gap-2 text-[11px]">
                  <span className="inline-flex min-w-0 items-center gap-1.5">
                    <span className="inline-block size-2 shrink-0 rounded-full" style={{ background: accent }} />
                    <span className="truncate text-muted-foreground">{nation?.name ?? e.nation}</span>
                  </span>
                  <span
                    className="ml-auto shrink-0 rounded-md px-2 py-0.5 font-semibold capitalize"
                    style={{
                      background: `${outcomeColor}22`,
                      color: outcomeColor,
                      border: `1px solid ${outcomeColor}55`,
                    }}
                    data-testid="event-outcome"
                  >
                    {e.outcome}
                  </span>
                </div>
              </article>
            );
          })}
        </div>
      </ScrollArea>
    </div>
  );
}