import { Badge } from "@code/ui/components/badge";
import {
  Activity,
  ChevronRight,
  FileText,
  GitPullRequest,
  Layers,
  Radio,
  TriangleAlert,
} from "lucide-react";

import { formatRelativeTime } from "@/lib/work-os/work-unit-projection";
import type { WorkUnitCard as WorkUnitCardData } from "@/lib/work-os/work-unit-projection";

const STATUS_LABEL: Record<WorkUnitCardData["status"], string> = {
  completed: "Completed",
  failed: "Failed",
  "needs-input": "Needs input",
  open: "Ready",
  queued: "Queued",
  working: "In progress",
};

const STATUS_TONE: Record<WorkUnitCardData["status"], string> = {
  completed: "bg-emerald-500/15 text-emerald-400",
  failed: "bg-destructive/15 text-destructive",
  "needs-input": "bg-amber-500/15 text-amber-400",
  open: "bg-muted text-muted-foreground",
  queued: "bg-violet-500/15 text-violet-400",
  working: "bg-blue-500/15 text-blue-400",
};

interface IndicatorProps {
  readonly icon: React.ReactNode;
  readonly label: string;
  readonly value: number;
  readonly tone?: string;
}

const Indicator = ({ icon, label, tone, value }: IndicatorProps) => (
  <span className="inline-flex items-center gap-1 text-[11px] text-muted-foreground">
    <span className={tone}>{icon}</span>
    {value}
    <span className="sr-only">{label}</span>
  </span>
);

interface WorkUnitCardProps {
  readonly card: WorkUnitCardData;
  readonly selected: boolean;
  readonly onSelect: () => void;
}

export const WorkUnitCard = ({
  card,
  onSelect,
  selected,
}: WorkUnitCardProps) => (
  <button
    className={`w-full cursor-pointer rounded-2xl border p-4 text-left transition-all duration-200 ${
      selected
        ? "border-foreground/20 bg-foreground/5"
        : "border-border/40 bg-card/40 hover:border-border/70 hover:bg-card/60"
    }`}
    onClick={onSelect}
    type="button"
  >
    <div className="flex items-start justify-between gap-3">
      <div className="min-w-0 flex-1">
        <p className="text-[11px] font-medium text-muted-foreground">
          #{card.number}
        </p>
        <h3 className="mt-0.5 text-sm font-semibold leading-5 tracking-tight">
          {card.title}
        </h3>
      </div>
      <Badge
        className={`shrink-0 rounded-full px-2 py-0.5 text-[10px] font-medium ${STATUS_TONE[card.status]}`}
        variant="secondary"
      >
        {STATUS_LABEL[card.status]}
      </Badge>
    </div>

    <p className="mt-2 line-clamp-2 text-xs leading-5 text-muted-foreground">
      {card.summary}
    </p>

    <div className="mt-3 flex flex-wrap items-center gap-3 border-t border-border/30 pt-3">
      {card.currentActivity ? (
        <span className="inline-flex items-center gap-1 text-[11px] text-muted-foreground">
          <Activity className="size-3" />
          {card.currentActivity}
        </span>
      ) : null}
      <Indicator
        icon={<Radio className="size-3" />}
        label="signals"
        value={card.signalCount}
      />
      <Indicator
        icon={<Layers className="size-3" />}
        label="steps"
        value={card.stepCount}
      />
      <Indicator
        icon={<FileText className="size-3" />}
        label="artifacts"
        value={card.artifactCount}
      />
      {card.hasPullRequest ? (
        <span className="inline-flex items-center gap-1 text-[11px] text-emerald-400">
          <GitPullRequest className="size-3" />
          PR
        </span>
      ) : null}
      {card.needsInput ? (
        <span className="inline-flex items-center gap-1 text-[11px] text-amber-400">
          <TriangleAlert className="size-3" />
          Input needed
        </span>
      ) : null}
      <span className="ml-auto inline-flex items-center gap-1">
        <span className="text-[11px] text-muted-foreground/70">
          {formatRelativeTime(card.updatedAt)}
        </span>
        <ChevronRight className="size-3.5 text-muted-foreground/50" />
      </span>
    </div>
  </button>
);