import { useTaskChatExpansion } from "./expansion-state";
import { cn } from "@/lib/utils";
import {
  Check,
  ChevronRight,
  Loader2,
  ShieldCheck,
  ShieldX,
  X,
} from "lucide-react";
import type { TaskChatToolItem } from "./task-chat-model";
import { toolTaxonomy } from "./tool-taxonomy";
import { useTaskChatShimmer } from "./TaskChatShimmer";
import { TaskChatDiffCounts, TaskChatDiffView } from "./TaskChatDiffView";
import { useTaskReferenceLabel, withTaskReference } from "./task-reference";

const STATUS_ICON = {
  pending: { Icon: Loader2, spin: false, tone: "text-muted-foreground" },
  in_progress: {
    Icon: Loader2,
    spin: true,
    tone: "text-(--status-agent-running)",
  },
  completed: { Icon: Check, spin: false, tone: "text-muted-foreground" },
  failed: { Icon: X, spin: false, tone: "text-destructive" },
  interrupted: { Icon: X, spin: false, tone: "text-muted-foreground" },
} as const;

function ToolTarget({ text }: { text: string }) {
  return (
    <span className="task-chat-collapsed-line-fade min-w-0 flex-1 font-mono text-(length:--text-micro) leading-4">
      {text}
    </span>
  );
}

/** Names the task a call is about by identifier; its UUID is never shown. */
function TaskReferenceToolTarget({ taskRefId, target }: { taskRefId: string; target?: string }) {
  const taskLabel = useTaskReferenceLabel(taskRefId);
  return <ToolTarget text={withTaskReference(target, taskLabel)!} />;
}

/**
 * Tool invocation as a flat activity row (v7): [glyph] [name] [mono target] …
 * [hover chevron] [status]. No card chrome — activity is metadata, not
 * content. Clicking toggles a compact result/change summary (left-rail
 * inset). An edit row carries its `+N −M` counts and opens to a compact,
 * height-capped diff of that one edit.
 */
export function TaskChatToolCard({ item }: { item: TaskChatToolItem }) {
  const { Icon, spin, tone } = STATUS_ICON[item.status];
  const shimmer = useTaskChatShimmer(item.id);
  const RowIcon = toolTaxonomy(item.rawName ?? item.name).icon;
  const [showDetail, setShowDetail] = useTaskChatExpansion(item.id, false);
  const expandable = Boolean(item.target || item.detail || item.diff);

  return (
    <div data-testid="task-chat-tool-card" className="flex min-w-0 max-w-full flex-col text-xs">
      <button
        type="button"
        onClick={expandable ? () => setShowDetail((v) => !v) : undefined}
        aria-expanded={expandable ? showDetail : undefined}
        className={cn(
          "group/tool -mx-1.5 flex min-h-6 w-full min-w-0 max-w-full items-center gap-2 overflow-hidden rounded-sm px-1.5 py-1 text-left leading-none text-muted-foreground",
          expandable
            ? "cursor-pointer transition-colors hover:bg-muted/60 hover:text-foreground"
            : "cursor-default",
        )}
      >
        <span className="flex w-5 shrink-0 items-center justify-center">
          <RowIcon
            className="h-3.5 w-3.5 shrink-0"
            aria-hidden
            data-testid="task-chat-tool-icon"
          />
        </span>
        <span data-conversation-tool-running={item.status === "in_progress" && shimmer ? "true" : undefined} className="flex min-w-0 flex-1 items-baseline gap-2 overflow-hidden">
          <span className="shrink-0 font-medium leading-4">{item.name}</span>
          {item.taskRefId ? (
            <TaskReferenceToolTarget taskRefId={item.taskRefId} target={item.target} />
          ) : item.target ? (
            <ToolTarget text={item.target} />
          ) : null}
        </span>
        <span className="ml-auto flex shrink-0 items-center gap-2">
          {item.diff && (item.diff.added > 0 || item.diff.removed > 0) ? (
            <TaskChatDiffCounts
              added={item.diff.added}
              removed={item.diff.removed}
              className="text-(length:--text-micro)"
            />
          ) : null}
          {item.decision ? (
            <span
              className={cn(
                "flex items-center gap-1 text-(length:--text-micro)",
                item.decision === "allowed"
                  ? "text-(--status-task-icon-done)"
                  : "text-destructive",
              )}
            >
              {item.decision === "allowed" ? (
                <ShieldCheck className="h-3 w-3" />
              ) : (
                <ShieldX className="h-3 w-3" />
              )}
              {item.decision}
            </span>
          ) : null}
          {expandable ? (
            <ChevronRight
              className={cn(
                "h-3 w-3 opacity-0 transition-[opacity,transform] group-hover/tool:opacity-80",
                showDetail ? "rotate-90" : null,
              )}
              aria-hidden
            />
          ) : null}
          <Icon
            className={cn("h-3.5 w-3.5", tone, spin && "animate-spin")}
            aria-hidden
          />
          {item.status === "interrupted" ? (
            <span className="text-(length:--text-micro) text-muted-foreground">
              Interrupted
            </span>
          ) : null}
        </span>
      </button>
      {item.target && showDetail && !item.diff?.lines?.length ? (
        <div
          className="task-chat-expanded-line-wrap ml-1.5 mt-0.5 min-w-0 max-w-full overflow-hidden border-l-2 border-border py-1 pl-2.5 font-mono text-(length:--text-micro) leading-relaxed text-muted-foreground"
          data-testid="task-chat-tool-target-detail"
        >
          {item.target}
        </div>
      ) : null}
      {item.detail && showDetail ? (
        <pre className="task-chat-expanded-line-wrap ml-1.5 mt-0.5 min-w-0 max-w-full overflow-hidden whitespace-pre-wrap border-l-2 border-border py-1 pl-2.5 font-mono text-(length:--text-micro) leading-relaxed text-muted-foreground">
          {item.detail}
        </pre>
      ) : null}
      {item.diff && showDetail ? (
        item.diff.lines && item.diff.lines.length > 0 ? (
          <div className="ml-1.5 mt-1 min-w-0 max-w-full" data-testid="task-chat-tool-diff">
            <TaskChatDiffView lines={item.diff.lines} truncated={item.diff.truncated} />
          </div>
        ) : (
          <div
            className="ml-1.5 mt-0.5 border-l-2 border-border py-1 pl-2.5"
            data-testid="task-chat-tool-change-summary"
          >
            <div className="flex min-w-0 items-center gap-2 text-(length:--text-micro) text-muted-foreground">
              <span className="shrink-0">Changed</span>
              {item.diff.path ? (
                <span className="min-w-0 truncate font-mono text-foreground">
                  {item.diff.path}
                </span>
              ) : null}
              <TaskChatDiffCounts added={item.diff.added} removed={item.diff.removed} className="ml-auto" />
            </div>
          </div>
        )
      ) : null}
    </div>
  );
}