"use client";

import { useCallback, useEffect, useState } from "react";
import Link from "next/link";
import { ArrowRightIcon, ChevronDownIcon, ChevronUpIcon, TruckIcon } from "lucide-react";
import type { GameStructure, GameVehicle, Shipment, Vehicle } from "@/payload-types";
import { ShipmentProgressBar } from "@/components/frontend/logistics/ShipmentProgressBar";
import { useGameTick } from "@/hooks/useGameTick";

type ActiveShipment = Shipment & {
  origin: GameStructure | number;
  destination: GameStructure | number;
  transportVehicle: GameVehicle & { type: Vehicle };
};

const statusBadge: Record<string, string> = {
  dispatched: "bg-blue-500/20 text-blue-400",
  in_transit: "bg-amber-500/20 text-amber-400",
};

const statusLabel: Record<string, string> = {
  dispatched: "Dispatched",
  in_transit: "In Transit",
};

// Module-scoped cache so the toast persists across re-mounts (page navigation
// re-mounts this client component; without this it flashes away and back).
const store: { shipments: ActiveShipment[]; open: boolean } = {
  shipments: [],
  open: false,
};

export function ShipmentToasts() {
  const [shipments, setShipments] = useState<ActiveShipment[]>(store.shipments);
  const [open, setOpenState] = useState(store.open);

  const setOpen = useCallback((value: boolean | ((v: boolean) => boolean)) => {
    setOpenState((prev) => {
      const next = typeof value === "function" ? value(prev) : value;
      store.open = next;
      return next;
    });
  }, []);

  const fetchShipments = useCallback(async () => {
    const params = new URLSearchParams();
    params.append("where[status][in][0]", "dispatched");
    params.append("where[status][in][1]", "in_transit");
    params.append("sort", "estimatedArrival");
    params.append("limit", "20");
    params.append("depth", "2");
    try {
      const r = await fetch(`/api/shipments?${params.toString()}`);
      const body = await r.json();
      store.shipments = body.docs ?? [];
      setShipments(store.shipments);
    } catch {
      store.shipments = [];
      setShipments([]);
    }
  }, []);

  useEffect(() => {
    fetchShipments();
    const interval = setInterval(fetchShipments, 30_000);
    return () => clearInterval(interval);
  }, [fetchShipments]);

  useGameTick(() => fetchShipments());

  if (shipments.length === 0) return null;

  const count = shipments.length;
  const countLabel = `${count} active shipment${count !== 1 ? "s" : ""}`;

  return (
    <div className="fixed bottom-4 right-4 z-50 flex flex-col items-end gap-2">
      {open && (
        <div className="w-80 sm:w-96 rounded-xl border border-border bg-background/95 backdrop-blur shadow-xl overflow-hidden">
          <div className="flex items-center justify-between gap-2 px-4 py-3 border-b border-border">
            <div className="flex items-center gap-2">
              <TruckIcon className="size-4 text-primary" />
              <span className="text-sm font-semibold">Active Shipments</span>
              <span className="text-xs font-mono text-muted-foreground">{count}</span>
            </div>
            <div className="flex items-center gap-1">
              <Link
                href="/logistics/shipments"
                className="text-xs text-muted-foreground hover:text-foreground px-2 py-1 rounded hover:bg-muted transition-colors"
              >
                View all
              </Link>
              <button
                type="button"
                onClick={() => setOpen(false)}
                className="p-1 rounded text-muted-foreground hover:text-foreground hover:bg-muted transition-colors"
                aria-label="Collapse shipment tracker"
              >
                <ChevronDownIcon className="size-4" />
              </button>
            </div>
          </div>
          <div className="max-h-[60vh] overflow-y-auto divide-y divide-border">
            {shipments.map((shipment) => {
              const origin =
                typeof shipment.origin === "object" && shipment.origin !== null
                  ? (shipment.origin as GameStructure)
                  : null;
              const destination =
                typeof shipment.destination === "object" && shipment.destination !== null
                  ? (shipment.destination as GameStructure)
                  : null;
              const vehicle =
                typeof shipment.transportVehicle === "object" && shipment.transportVehicle !== null
                  ? (shipment.transportVehicle as GameVehicle & { type: Vehicle })
                  : null;
              const vehicleType = vehicle && typeof vehicle.type === "object" ? vehicle.type : null;

              return (
                <Link
                  key={shipment.id}
                  href={`/logistics/shipments/${shipment.id}`}
                  className="block px-4 py-3 hover:bg-muted/50 transition-colors"
                >
                  <div className="flex items-center justify-between gap-2">
                    <span className="text-sm font-medium truncate">
                      {shipment.name ?? `SHP-${shipment.id}`}
                    </span>
                    <span
                      className={`text-[10px] font-semibold uppercase tracking-wider px-1.5 py-0.5 rounded shrink-0 ${
                        statusBadge[shipment.status] ?? "bg-muted text-muted-foreground"
                      }`}
                    >
                      {statusLabel[shipment.status] ?? shipment.status}
                    </span>
                  </div>
                  <div className="mt-1 flex items-center gap-1.5 text-xs text-muted-foreground">
                    <span className="truncate">
                      {origin?.name ?? `Structure #${shipment.origin}`}
                    </span>
                    <ArrowRightIcon className="size-3 shrink-0" />
                    <span className="truncate">
                      {destination?.name ?? `Structure #${shipment.destination}`}
                    </span>
                  </div>
                  {vehicleType && (
                    <p className="mt-0.5 text-xs text-muted-foreground/80">{vehicleType.name}</p>
                  )}
                  {shipment.dispatchedAt && shipment.estimatedArrival && (
                    <div className="mt-2">
                      <ShipmentProgressBar
                        dispatchedAt={shipment.dispatchedAt}
                        estimatedArrival={shipment.estimatedArrival}
                      />
                    </div>
                  )}
                </Link>
              );
            })}
          </div>
        </div>
      )}

      <button
        type="button"
        onClick={() => setOpen((v) => !v)}
        className="flex items-center gap-2 rounded-full border border-border bg-background/95 backdrop-blur px-3.5 py-2 text-sm shadow-lg hover:border-primary/50 hover:scale-[1.02] transition-all"
        aria-label={open ? "Collapse shipment tracker" : "Show active shipments"}
      >
        <span className="relative flex size-2">
          <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-primary opacity-60" />
          <span className="relative inline-flex size-2 rounded-full bg-primary" />
        </span>
        <TruckIcon className="size-4 text-primary" />
        <span className="font-medium">{countLabel}</span>
        {open ? (
          <ChevronDownIcon className="size-4 text-muted-foreground" />
        ) : (
          <ChevronUpIcon className="size-4 text-muted-foreground" />
        )}
      </button>
    </div>
  );
}