"use client";

import * as React from "react";
import { gateLabelForStatus } from "@tasks/shared/convoy-lifecycle";
import type { ConvoyStatus } from "@tasks/shared/convoy-lifecycle";
import { Loader2, Radar } from "lucide-react";

import { ConvoyDetailPanel } from "@/components/mission-control/convoy-detail-panel";
import { FleetActivityFeed } from "@/components/fleet/fleet-activity-feed";
import { cn } from "@/lib/utils";
import { api } from "@/lib/trpc";

function formatAge(date: Date | string): string {
  const d = new Date(date);
  const diff = Date.now() - d.getTime();
  const days = Math.floor(diff / (1000 * 60 * 60 * 24));
  if (days > 0) return `${days}d`;
  const hours = Math.floor(diff / (1000 * 60 * 60));
  if (hours > 0) return `${hours}h`;
  const mins = Math.floor(diff / (1000 * 60));
  return `${mins}m`;
}

export default function FleetPage() {
  const fleetQuery = api.convoys.fleet.useQuery();
  const [selected, setSelected] = React.useState<{ convoyId: string; workspaceSlug: string } | null>(null);

  if (fleetQuery.isLoading) {
    return (
      <div className="flex items-center gap-2 p-6 text-sm text-muted-foreground">
        <Loader2 className="size-4 animate-spin" />
        Loading fleet…
      </div>
    );
  }

  if (fleetQuery.error) {
    return <p className="p-6 text-sm text-destructive">{fleetQuery.error.message}</p>;
  }

  const data = fleetQuery.data;
  const byWorkspace = data?.byWorkspace ?? [];
  const gateInboxAcross = data?.gateInboxAcross ?? [];

  // Group gate inbox by status for "× pr_review 2d" count display
  const gateByStatus = new Map<string, typeof gateInboxAcross>();
  for (const c of gateInboxAcross) {
    const arr = gateByStatus.get(c.status) ?? [];
    arr.push(c);
    gateByStatus.set(c.status, arr);
  }

  return (
    <div className="flex h-full min-h-0 flex-col">
      <header className="flex shrink-0 items-center gap-3 border-b border-border px-6 py-4">
        <div className="flex h-9 w-9 items-center justify-center rounded-lg bg-primary/10">
          <Radar className="size-5 text-primary" />
        </div>
        <div>
          <h1 className="text-lg font-semibold">Fleet</h1>
          <p className="text-xs text-muted-foreground">All workspaces · gates needing you · live convoy events</p>
        </div>
      </header>

      <div className="grid min-h-0 flex-1 grid-cols-1 gap-4 overflow-y-auto p-4 lg:grid-cols-[260px_1fr_340px]">
        {/* Needs you */}
        <div className="flex min-h-0 flex-col gap-4">
          <section className="rounded-lg border border-border bg-card">
            <div className="border-b border-border p-4">
              <h2 className="text-sm font-semibold">Needs you</h2>
              <p className="text-xs text-muted-foreground">Gate inbox across all workspaces</p>
              {gateInboxAcross.length > 0 && (
                <div className="mt-2 flex flex-wrap gap-2 text-xs">
                  {[...gateByStatus.entries()].map(([status, list]) => (
                    <span key={status} className="rounded bg-amber-500/10 px-2 py-0.5 text-amber-700 dark:text-amber-300">
                      × {status} {list.length} · {formatAge(list[0]?.updatedAt ?? new Date())}
                    </span>
                  ))}
                </div>
              )}
            </div>
            <div className="p-3">
              {gateInboxAcross.length === 0 ? (
                <p className="text-sm text-muted-foreground">No pending gates.</p>
              ) : (
                <ul className="space-y-2">
                  {gateInboxAcross.map((convoy) => (
                    <li key={`${convoy.workspaceId}-${convoy.id}`}>
                      <button
                        type="button"
                        onClick={() => setSelected({ convoyId: convoy.id, workspaceSlug: convoy.workspaceSlug })}
                        className={cn(
                          "w-full rounded-md border border-amber-500/30 bg-amber-500/5 p-3 text-left text-sm hover:bg-amber-500/10",
                          selected?.convoyId === convoy.id && "ring-2 ring-amber-500",
                        )}
                      >
                        <p className="font-medium">{convoy.content?.convoySlug ?? convoy.title}</p>
                        <p className="text-xs text-amber-700 dark:text-amber-300">{gateLabelForStatus(convoy.status as ConvoyStatus) ?? convoy.status}</p>
                        <p className="text-[10px] text-muted-foreground">
                          {convoy.workspaceName} · {convoy.workspaceSlug} · {formatAge(convoy.updatedAt)} ago
                        </p>
                      </button>
                    </li>
                  ))}
                </ul>
              )}
            </div>
          </section>

          <FleetActivityFeed />
        </div>

        {/* byWorkspace cards grid */}
        <div className="min-h-0 space-y-4">
          {byWorkspace.length === 0 ? (
            <p className="rounded-lg border border-dashed p-6 text-sm text-muted-foreground">No workspaces or no convoys yet.</p>
          ) : (
            <div className="grid grid-cols-1 gap-4 xl:grid-cols-2">
              {byWorkspace.map(({ workspace, convoys }) => {
                const workspaceGateCount = gateInboxAcross.filter((c) => c.workspaceId === workspace.id).length;
                return (
                  <div key={workspace.id} className="rounded-lg border border-border bg-card">
                    <div className="border-b border-border px-4 py-3">
                      <h3 className="text-sm font-semibold">{workspace.name}</h3>
                      <p className="text-xs text-muted-foreground">
                        {workspace.slug} · {convoys.length} convoys
                        {workspaceGateCount > 0 ? ` · ${workspaceGateCount} needing you` : ""}
                      </p>
                    </div>
                    <ul className="space-y-2 p-3">
                      {convoys.length === 0 ? (
                        <li className="text-xs text-muted-foreground">No convoys.</li>
                      ) : (
                        convoys.slice(0, 8).map((convoy) => (
                          <li key={convoy.id}>
                            <button
                              type="button"
                              onClick={() => setSelected({ convoyId: convoy.id, workspaceSlug: convoy.workspaceSlug })}
                              className={cn(
                                "w-full rounded-md border border-border bg-background p-2 text-left text-sm transition-colors hover:bg-muted",
                                selected?.convoyId === convoy.id && "ring-2 ring-primary",
                              )}
                            >
                              <p className="font-medium">{convoy.content?.convoySlug ?? convoy.title}</p>
                              <p className="text-[10px] text-muted-foreground">
                                {convoy.status} · {convoy.content?.classification ?? ""} · {formatAge(convoy.updatedAt)} ago
                              </p>
                            </button>
                          </li>
                        ))
                      )}
                      {convoys.length > 8 && (
                        <li className="text-center text-xs text-muted-foreground">+{convoys.length - 8} more</li>
                      )}
                    </ul>
                  </div>
                );
              })}
            </div>
          )}

          {/* byStatus summary */}
          {data?.byStatus && Object.keys(data.byStatus).length > 0 && (
            <div className="rounded-lg border border-border bg-muted/10 p-3">
              <p className="mb-2 text-xs font-semibold uppercase text-muted-foreground">By status</p>
              <div className="flex flex-wrap gap-2">
                {Object.entries(data.byStatus).map(([status, list]) => (
                  <span key={status} className="rounded border border-border bg-background px-2 py-1 text-xs">
                    {status}: {(list as unknown[]).length}
                  </span>
                ))}
              </div>
            </div>
          )}
        </div>

        {/* Detail panel workspace-agnostic */}
        <aside className="min-h-0 border border-border bg-background lg:rounded-lg">
          {selected ? (
            <ConvoyDetailPanel workspaceSlug={selected.workspaceSlug} convoyId={selected.convoyId} />
          ) : (
            <div className="flex h-full items-center justify-center p-6 text-sm text-muted-foreground">
              Select a convoy to review gates and co-pilot suggestions.
            </div>
          )}
        </aside>
      </div>
    </div>
  );
}