import config from "@payload-config";
import { getPayload } from "payload";
import { headers as nextHeaders } from "next/headers";
import Link from "next/link";
import { isPayloadUser } from "@/utils/access-control/isPayloadUser";
import { hasLogisticsQualification } from "@/utils/access-control/hasLogisticsQualification";
import {
  LedgerRow,
  NoticeState,
  PageShell,
  ProvenanceChip,
  STATUS_TONE_CLASSES,
  type ReadoutCell,
  type StatusTone,
} from "@/components/frontend/operations";
import { SupplyBoxActions } from "@/components/frontend/logistics/SupplyBoxActions";
import type { ArmaCommand, SupplyBox } from "@/payload-types";
import type { SurfaceUser } from "@/lib/operations/surface";

type PayloadType = Awaited<ReturnType<typeof import("payload").getPayload>>;

export const metadata = {
  title: "Supply Box Detail: Polaris Task Force",
};

function relationId(value: unknown): number | null {
  if (typeof value === "number") return value;
  if (value !== null && typeof value === "object" && "id" in (value as { id: unknown })) {
    const id = (value as { id: unknown }).id;
    return typeof id === "number" ? id : null;
  }
  return null;
}

function locationFromJson(value: unknown): { x: number; y: number; z: number } | null {
  if (typeof value !== "object" || value === null) return null;
  const { x, y, z } = value as { x?: unknown; y?: unknown; z?: unknown };
  if (typeof x !== "number" || typeof y !== "number" || typeof z !== "number") return null;
  return { x, y, z };
}

function locationLabel(value: unknown): string {
  const loc = locationFromJson(value);
  return loc === null ? "n/a" : `${loc.x}, ${loc.y}, ${loc.z}`;
}

function commandTone(status: string): StatusTone {
  if (status === "succeeded") return "success";
  if (status === "failed") return "danger";
  if (status === "delivered") return "info";
  return "neutral";
}

export interface SupplyBoxDetailData {
  box: SupplyBox | null;
  capability: boolean;
  commands: ArmaCommand[];
}

/**
 * Full detail for a single supply box plus its recent queued commands, fetched
 * through collection access control (default access + the explicit session
 * user, never overrideAccess). Returns null for an unknown id so the page can
 * render a not-found notice.
 */
async function getSupplyBoxDetail(
  payload: PayloadType,
  user: SurfaceUser,
  id: string,
): Promise<SupplyBoxDetailData> {
  const qualified = await hasLogisticsQualification(payload, user);
  if (!qualified) return { box: null, capability: false, commands: [] };

  let box: SupplyBox | null = null;
  try {
    box = await payload.findByID({
      collection: "supply-boxes",
      id: Number(id),
      depth: 2,
      user: user ?? undefined,
    });
  } catch {
    box = null;
  }
  if (box === null) return { box: null, capability: true, commands: [] };

  const serverId = relationId(box.server);
  const commands =
    serverId === null
      ? []
      : (
          await payload.find({
            collection: "arma-commands",
            where: { server: { equals: serverId } },
            sort: "-createdAt",
            limit: 50,
            depth: 0,
            user: user ?? undefined,
          })
        ).docs.filter((cmd) => Array.isArray(cmd.payload) && cmd.payload[0] === box.boxId);

  return { box, capability: true, commands };
}

function Section({ title, children }: { title: string; children: React.ReactNode }) {
  return (
    <section data-slot="supply-box-section" className="flex flex-col gap-2">
      <h2 className="font-mono text-[9px] uppercase tracking-widest text-white/60">{title}</h2>
      {children}
    </section>
  );
}

function kvRow(label: string, value: React.ReactNode) {
  return (
    <div className="flex items-start justify-between gap-4 border border-white/10 px-2 py-1.5">
      <span className="shrink-0 font-mono text-[9px] uppercase tracking-widest text-white/50">
        {label}
      </span>
      <span className="min-w-0 truncate text-right font-mono text-xs text-white/80">{value}</span>
    </div>
  );
}

export default async function SupplyBoxDetailPage({ params }: { params: Promise<{ id: string }> }) {
  const { id } = await params;
  const payload = await getPayload({ config });
  const { user: authUser } = await payload.auth({
    headers: await nextHeaders(),
    canSetHeaders: false,
  });
  const user = isPayloadUser(authUser) ? authUser : null;
  const surfaceUser: SurfaceUser = user ? { id: user.id } : null;

  const { box, capability, commands } = await getSupplyBoxDetail(payload, surfaceUser, id);

  if (capability === false) {
    return (
      <div className="mx-auto flex w-full max-w-7xl flex-col gap-6 px-4 py-6">
        <PageShell title="Supply Box" meta="LOGISTICS // CRATE SYNC">
          <NoticeState
            variant="error"
            message="You do not have the Logistics qualification to manage supply boxes."
            hint="Request the Logistics qualification from unit command."
          />
        </PageShell>
      </div>
    );
  }

  if (box === null) {
    return (
      <div className="mx-auto flex w-full max-w-7xl flex-col gap-6 px-4 py-6">
        <PageShell title="Supply Box" meta="LOGISTICS // CRATE SYNC">
          <NoticeState
            variant="error"
            message="Supply box not found."
            hint="The supply box id is unknown or you lack permission to read it."
            action={
              <Link
                href="/logistics/supply-boxes"
                className="mt-2 border border-white/15 px-3 py-1 font-mono text-[10px] uppercase tracking-widest text-white/80 hover:border-white/30 hover:text-white"
              >
                Back to supply boxes
              </Link>
            }
          />
        </PageShell>
      </div>
    );
  }

  const contents = Array.isArray(box.contents) ? box.contents : [];
  const itemCount = contents.reduce<number>((sum, line) => {
    if (typeof line !== "object" || line === null) return sum;
    const count = (line as { count?: unknown }).count;
    return sum + (typeof count === "number" ? count : 0);
  }, 0);
  const sourceEventId = relationId(box.sourceEvent);

  const readoutCells: ReadoutCell[] = [
    { label: "Class", value: box.boxClass ?? "n/a" },
    { label: "Status", value: box.status },
    { label: "Items", value: String(itemCount) },
    { label: "Last Sync", value: box.lastSyncedAt },
  ];

  return (
    <div className="mx-auto flex w-full max-w-7xl flex-col gap-6 px-4 py-6">
      <PageShell title={box.boxId} meta="SUPPLY BOX // DETAIL">
        <Link
          href="/logistics/supply-boxes"
          className="font-mono text-[10px] uppercase tracking-widest text-white/60 underline-offset-4 hover:underline"
        >
          Back to supply boxes
        </Link>

        <LedgerRow cells={readoutCells} />

        {sourceEventId !== null ? (
          <ProvenanceChip
            label={`RAW EVENT #${sourceEventId}`}
            href={`/admin/collections/arma-sync-events/${sourceEventId}`}
          />
        ) : null}

        <Section title="Contents">
          {contents.length === 0 ? (
            <NoticeState variant="empty" message="This crate is empty." />
          ) : (
            <ul className="flex flex-col gap-1">
              {contents.map((line, index) => (
                <li
                  key={index}
                  className="flex items-center justify-between gap-2 border border-white/10 px-2 py-1.5"
                >
                  <span className="min-w-0 truncate font-mono text-xs text-white/80">
                    {(line as { class?: unknown }).class as string}
                  </span>
                  <span className="font-mono text-xs tabular-nums text-white/70">
                    {(line as { count?: unknown }).count as number}
                  </span>
                </li>
              ))}
            </ul>
          )}
        </Section>

        <Section title="Location">
          <div className="flex flex-col gap-1">
            {kvRow("Position", locationLabel(box.location))}
            {kvRow("Session", box.sessionId)}
          </div>
        </Section>

        <Section title="Command Queue">
          <SupplyBoxActions
            boxId={box.boxId}
            boxClass={box.boxClass ?? null}
            location={locationFromJson(box.location)}
            contents={contents.map((line) => ({
              class: (line as { class?: unknown }).class as string,
              count: (line as { count?: unknown }).count as number,
            }))}
          />
        </Section>

        <Section title="Recent Commands">
          {commands.length === 0 ? (
            <NoticeState variant="empty" message="No commands have been queued for this crate." />
          ) : (
            <ul className="flex flex-col gap-1">
              {commands.map((cmd) => (
                <li
                  key={cmd.id}
                  className="flex items-center justify-between gap-2 border border-white/10 px-2 py-1.5"
                >
                  <span className="min-w-0 truncate font-mono text-xs text-white/80">
                    {cmd.type}
                  </span>
                  <span className="flex shrink-0 items-center gap-2">
                    <span
                      className={`border px-1.5 py-0.5 font-mono text-[10px] uppercase tracking-widest ${STATUS_TONE_CLASSES[commandTone(cmd.status)]}`}
                    >
                      {cmd.status}
                    </span>
                    {cmd.error ? (
                      <span className="max-w-40 truncate font-mono text-[10px] text-rose-300">
                        {cmd.error}
                      </span>
                    ) : null}
                  </span>
                </li>
              ))}
            </ul>
          )}
        </Section>
      </PageShell>
    </div>
  );
}