import { cn } from "@/lib/utils";
import { formatEastern } from "@/lib/time";
import type { StateResponse } from "../api";

interface Props {
  state: StateResponse | null;
  connected: boolean;
  generatedAt: string | null;
}

interface ChipDef {
  key: keyof StateResponse["summary"];
  label: string;
  numCls: string;
  bgCls: string;
}

const CHIPS: ChipDef[] = [
  {
    key: "active",
    label: "ACTIVE",
    numCls: "text-status-active",
    bgCls: "bg-status-active-bg",
  },
  {
    key: "waiting",
    label: "AWAITING HUMAN",
    numCls: "text-status-waiting",
    bgCls: "bg-status-waiting-bg",
  },
  {
    key: "parked",
    label: "PARKED",
    numCls: "text-status-parked",
    bgCls: "bg-status-parked-bg",
  },
  {
    key: "open_questions",
    label: "OPEN QUESTIONS",
    numCls: "text-status-waiting",
    bgCls: "bg-status-waiting-bg",
  },
  {
    key: "total",
    label: "TOTAL",
    numCls: "text-muted-foreground",
    bgCls: "bg-muted",
  },
];

// Top status bar: brand, summary chips, connection health, and snapshot clock.
export function TopBar({ state, connected, generatedAt }: Props) {
  const summary = state?.summary;
  const snapshot = formatEastern(generatedAt);
  const title = connected
    ? `Live — snapshot at ${snapshot}`
    : `Disconnected — last snapshot at ${snapshot}`;

  return (
    <header
      className="flex items-center gap-3 py-2 px-3 bg-card border-b border-border"
      role="banner"
    >
      {/* Brand */}
      <div className="flex items-center gap-2 shrink-0">
        <span
          className="w-3 h-3 rounded-full bg-gradient-to-br from-primary to-primary/50 shadow-sm"
          aria-hidden
        />
        <span className="text-sm font-bold text-foreground tracking-tight leading-none">
          agent-team
        </span>
        <span className="text-xs text-muted-foreground leading-none">
          pipeline
        </span>
      </div>

      {/* Divider */}
      <div className="w-px h-5 bg-border shrink-0" aria-hidden />

      {/* Summary chips */}
      <div
        className="flex items-center gap-2 flex-1 min-w-0 overflow-x-auto"
        role="list"
        aria-label="Pipeline summary"
      >
        {CHIPS.map((c) => (
          <div
            key={c.key}
            role="listitem"
            className={cn(
              "flex flex-col items-center justify-center rounded-md px-2.5 py-1 shrink-0",
              c.bgCls,
            )}
          >
            <span className={cn("text-sm font-bold leading-none tabular-nums", c.numCls)}>
              {summary ? summary[c.key] : "–"}
            </span>
            <span className="text-[9px] font-semibold tracking-widest text-muted-foreground leading-none mt-0.5 whitespace-nowrap">
              {c.label}
            </span>
          </div>
        ))}
      </div>

      {/* Health indicator */}
      <div
        className="flex items-center gap-2 shrink-0 ml-auto"
        title={title}
        aria-label={title}
      >
        <span
          aria-hidden
          className={cn(
            "w-2.5 h-2.5 rounded-full",
            connected
              ? "bg-status-active shadow-[0_0_6px_2px_hsl(var(--status-active)/0.45)]"
              : "bg-status-failed",
          )}
        />
        <span className="text-xs text-muted-foreground tabular-nums">
          {snapshot}
        </span>
      </div>
    </header>
  );
}