"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import type { Asset, MarketListing, MarketNegotiation } from "@/payload-types";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { formatAmount } from "@/lib/banking/format";
import {
  acceptMarketOffer,
  cancelMarketOffer,
  counterMarketOffer,
  rejectMarketOffer,
} from "@/app/(frontend)/logistics/market/actions";
import { HandshakeIcon } from "lucide-react";
import { toast } from "sonner";
import { cn } from "@/lib/utils";
import { PatienceMeter } from "@/components/frontend/market/PatienceMeter";
import { NegotiationHistoryDialog } from "@/components/frontend/market/NegotiationHistoryDialog";

const STATUS_LABELS: Record<string, string> = {
  open: "Open",
  accepted: "Accepted",
  rejected: "Rejected",
  closed: "Closed",
  cancelled: "Cancelled",
  expired: "Expired",
};

function listingOf(negotiation: MarketNegotiation): MarketListing | null {
  return typeof negotiation.listing === "object" && negotiation.listing
    ? (negotiation.listing as MarketListing)
    : null;
}

function assetName(listing: MarketListing | null): string {
  if (!listing) return "Unknown item";
  const asset = listing.asset as Asset;
  return typeof asset === "object" && asset ? asset.name : `Asset #${listing.asset}`;
}

function counterpartyLabel(
  negotiation: MarketNegotiation,
  role: "buyer" | "seller",
): string {
  if (role === "buyer") {
    const listing = listingOf(negotiation);
    if (listing?.isAutoGenerated) {
      const npc = listing.npc as unknown;
      if (typeof npc === "object" && npc && "name" in (npc as object)) {
        return (npc as { name: string }).name;
      }
      return "Market vendor";
    }
    const seller = listing?.seller as unknown;
    if (typeof seller === "object" && seller && "username" in (seller as object)) {
      return (seller as { username?: string; displayName?: string }).displayName ||
        (seller as { username?: string }).username ||
        "Seller";
    }
    return "Seller";
  }
  const buyer = negotiation.buyer as unknown;
  if (typeof buyer === "object" && buyer && "username" in (buyer as object)) {
    return (buyer as { username?: string }).username ?? "Buyer";
  }
  return "Buyer";
}

function NegotiationRow({
  negotiation,
  role,
  currencyLabel,
}: {
  negotiation: MarketNegotiation;
  role: "buyer" | "seller";
  currencyLabel: string | null;
}) {
  const router = useRouter();
  const [busy, setBusy] = useState<string | null>(null);
  const [counterOpen, setCounterOpen] = useState(false);
  const [counter, setCounter] = useState("");
  const [error, setError] = useState<string | null>(null);

  const listing = listingOf(negotiation);
  const isOpen = negotiation.status === "open";
  const theirProposal =
    (role === "buyer" && negotiation.proposedBy === "seller") ||
    (role === "seller" && negotiation.proposedBy === "buyer");
  const fmt = (n: number) => formatAmount(n, { name: currencyLabel ?? undefined });

  async function run(action: () => Promise<{ success: boolean; error?: string }>, key: string) {
    setBusy(key);
    setError(null);
    const res = await action();
    if (res.success) {
      if (key === "accept") {
        const qty = negotiation.quantity ?? listing?.quantity ?? 1;
        toast.success("Deal closed", {
          description: `Sold ${qty}× at ${fmt(negotiation.amount ?? 0)} each — total ${fmt((negotiation.amount ?? 0) * qty)}.`,
        });
      }
      router.refresh();
    } else {
      setError(res.error ?? "Something went wrong.");
    }
    setBusy(null);
  }

  function handleCounter() {
    const value = Number(counter);
    if (!Number.isFinite(value) || value <= 0) {
      setError("Enter a valid amount.");
      return;
    }
    void run(() => counterMarketOffer(negotiation.id, value), "counter");
  }

  const showActions = isOpen && theirProposal;

  return (
    <div className="flex flex-col gap-2 rounded-md border p-3">
      <div className="flex items-center justify-between gap-2">
        <div className="flex flex-col gap-0.5">
          <span className="text-sm font-medium">{assetName(listing)}</span>
          <span className="text-xs text-muted-foreground">
            {counterpartyLabel(negotiation, role)} · {listing?.quantity ?? "?"}× in stock
          </span>
        </div>
        <Badge variant={isOpen ? "default" : "secondary"}>{STATUS_LABELS[negotiation.status] ?? negotiation.status}</Badge>
      </div>

      <div className="flex items-center gap-2 text-sm">
        <span className="font-mono">{fmt(negotiation.amount ?? 0)}</span>
        <span className="text-xs text-muted-foreground">
          {negotiation.quantity ? `${negotiation.quantity}× · ` : ""}
          {theirProposal
            ? role === "buyer"
              ? "their counteroffer"
              : "buyer's offer"
            : "your offer"}
          {negotiation.quantity ? (
            <>
              {" · total "}
              <span className="font-mono">
                {fmt((negotiation.amount ?? 0) * negotiation.quantity)}
              </span>
            </>
          ) : null}
        </span>
      </div>

      {role === "buyer" && listing?.isAutoGenerated && isOpen && (
        <PatienceMeter patience={negotiation.patience ?? 0} />
      )}

      {isOpen && theirProposal && (
        <div className="flex flex-wrap items-center gap-2">
          <Button
            size="sm"
            onClick={() => void run(() => acceptMarketOffer(negotiation.id), "accept")}
            disabled={busy !== null}
          >
            {busy === "accept" ? "Buying..." : "Accept"}
          </Button>
          <Button
            size="sm"
            variant="outline"
            onClick={() => setCounterOpen((v) => !v)}
            disabled={busy !== null}
          >
            Counter
          </Button>
          <Button
            size="sm"
            variant="ghost"
            onClick={() => void run(() => rejectMarketOffer(negotiation.id), "reject")}
            disabled={busy !== null}
          >
            {busy === "reject" ? "..." : "Reject"}
          </Button>
        </div>
      )}

      {isOpen && role === "buyer" && !theirProposal && (
        <Button
          size="sm"
          variant="ghost"
          className="w-fit"
          onClick={() => void run(() => cancelMarketOffer(negotiation.id), "withdraw")}
          disabled={busy !== null}
        >
          {busy === "withdraw" ? "..." : "Withdraw"}
        </Button>
      )}

      {counterOpen && (
        <div className="flex items-center gap-2">
          <Input
            type="number"
            min={0.01}
            step="any"
            className="w-36"
            value={counter}
            onChange={(e) => setCounter(e.target.value)}
            placeholder="Your counter"
          />
          <Button size="sm" onClick={handleCounter} disabled={busy !== null}>
            {busy === "counter" ? "..." : "Send"}
          </Button>
        </div>
      )}

      {error && <p className="text-sm text-red-400">{error}</p>}
    </div>
  );
}

interface NegotiationPanelProps {
  negotiations: MarketNegotiation[];
  currentUserId: number;
  currencyLabel: string | null;
}

export function NegotiationPanel({ negotiations, currentUserId, currencyLabel }: NegotiationPanelProps) {
  const open = negotiations.filter((n) => n.status === "open");
  const closed = negotiations.filter((n) => n.status !== "open");

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

  return (
    <section className="flex flex-col gap-3">
      <div className="flex items-center gap-2">
        <HandshakeIcon className="size-4 text-muted-foreground" />
        <h2 className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
          Negotiations
        </h2>
        {open.length > 0 && (
          <Badge variant="outline" className="text-xs">
            {open.length} open
          </Badge>
        )}
        <div className="ml-auto">
          <NegotiationHistoryDialog
            negotiations={negotiations}
            currentUserId={currentUserId}
            currencyLabel={currencyLabel}
          />
        </div>
      </div>

      {open.length > 0 && (
        <div className="grid grid-cols-1 lg:grid-cols-2 gap-3">
          {open.map((negotiation) => {
            const role: "buyer" | "seller" =
              negotiation.buyer &&
              (typeof negotiation.buyer === "object"
                ? negotiation.buyer.id
                : negotiation.buyer) === currentUserId
                ? "buyer"
                : "seller";
            return (
              <NegotiationRow
                key={negotiation.id}
                negotiation={negotiation}
                role={role}
                currencyLabel={currencyLabel}
              />
            );
          })}
        </div>
      )}

      {closed.length > 0 && (
        <div className="flex flex-wrap gap-1.5">
          {closed.slice(0, 6).map((negotiation) => (
            <Badge key={negotiation.id} variant="secondary" className="font-normal">
              {assetName(listingOf(negotiation))} · {STATUS_LABELS[negotiation.status] ?? negotiation.status}
            </Badge>
          ))}
          {closed.length > 6 && (
            <span className={cn("text-xs text-muted-foreground self-center")}>
              +{closed.length - 6} more
            </span>
          )}
        </div>
      )}
    </section>
  );
}