"use client";

import { useState } from "react";
import { toast } from "sonner";
import { Badge } from "@/components/ui/badge";
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import { Button } from "@/components/ui/button";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { appealTransfer, cancelTransfer } from "@/app/(frontend)/transfers/actions";
import { TransferNoteDialog } from "@/components/frontend/transfers/TransferNoteDialog";
import {
  TRANSFER_ESCALATION_LABELS,
  TRANSFER_STATUS_LABELS,
  TRANSFER_STATUS_VARIANTS,
  assignmentLabel,
  formatTransferDate,
  personLabel,
  relationId,
  type TransferRecord,
} from "@/components/frontend/transfers/transferTypes";

interface TransferRequestCardProps {
  readonly transfer: TransferRecord;
  readonly currentUserId: number;
  readonly onUpdated: () => Promise<void>;
}

export function TransferRequestCard({
  transfer,
  currentUserId,
  onUpdated,
}: TransferRequestCardProps) {
  const [appealOpen, setAppealOpen] = useState(false);
  const [cancelBusy, setCancelBusy] = useState(false);
  const [confirmCancel, setConfirmCancel] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const isRequester = relationId(transfer.requester) === currentUserId;
  const canCancel = isRequester && transfer.status === "pending";
  const canAppeal = isRequester && transfer.status === "rejected";

  async function handleCancel() {
    if (!confirmCancel) {
      setConfirmCancel(true);
      return;
    }

    setCancelBusy(true);
    setError(null);
    try {
      const result = await cancelTransfer(transfer.id);
      if (!result.success) {
        setError(result.error ?? "Could not cancel the transfer request.");
        return;
      }
      setConfirmCancel(false);
      toast.success("Transfer request cancelled");
      await onUpdated();
    } catch (caughtError) {
      setError(
        caughtError instanceof Error
          ? caughtError.message
          : "Could not cancel the transfer request.",
      );
    } finally {
      setCancelBusy(false);
    }
  }

  async function handleAppeal(note: string) {
    const result = await appealTransfer(transfer.id, note || undefined);
    if (result.success) void onUpdated();
    return result;
  }

  return (
    <Card>
      <CardHeader className="flex-row items-start">
        <div className="flex min-w-0 flex-col gap-1">
          <CardTitle className="text-base">Transfer #{transfer.id}</CardTitle>
          <CardDescription>
            Requested {formatTransferDate(transfer.createdAt)} by {personLabel(transfer.requester)}
          </CardDescription>
        </div>
        <Badge variant={TRANSFER_STATUS_VARIANTS[transfer.status]}>
          {TRANSFER_STATUS_LABELS[transfer.status]}
        </Badge>
      </CardHeader>

      <CardContent className="flex flex-col gap-3">
        <div className="grid min-w-0 grid-cols-1 gap-3 sm:grid-cols-2">
          <div className="flex min-w-0 flex-col gap-1">
            <span className="text-xs font-semibold uppercase tracking-wide text-muted-foreground">
              From
            </span>
            <span className="truncate text-sm">{assignmentLabel(transfer.fromAssignment)}</span>
          </div>
          <div className="flex min-w-0 flex-col gap-1">
            <span className="text-xs font-semibold uppercase tracking-wide text-muted-foreground">
              Requested destination
            </span>
            <span className="truncate text-sm">{assignmentLabel(transfer.toAssignment)}</span>
          </div>
        </div>

        {transfer.requestNote && (
          <div className="flex flex-col gap-1">
            <span className="text-xs font-semibold uppercase tracking-wide text-muted-foreground">
              Request note
            </span>
            <p className="text-sm text-muted-foreground">{transfer.requestNote}</p>
          </div>
        )}

        {transfer.rejectionReason && (
          <Alert variant="destructive">
            <AlertTitle>Rejection reason</AlertTitle>
            <AlertDescription>{transfer.rejectionReason}</AlertDescription>
          </Alert>
        )}

        {transfer.status === "awaiting_superuser" && transfer.escalationReason && (
          <Alert>
            <AlertTitle>{TRANSFER_ESCALATION_LABELS[transfer.escalationReason]}</AlertTitle>
            <AlertDescription>
              A superuser will make the final decision. Remaining leader approvals are bypassed.
            </AlertDescription>
          </Alert>
        )}

        {error && (
          <p role="alert" className="text-sm text-destructive">
            {error}
          </p>
        )}
      </CardContent>

      {(canCancel || canAppeal) && (
        <CardFooter className="flex flex-wrap gap-2">
          {canCancel && (
            <Button
              variant="destructive"
              size="sm"
              onClick={() => void handleCancel()}
              disabled={cancelBusy}
            >
              {cancelBusy ? "Cancelling..." : confirmCancel ? "Confirm cancellation?" : "Cancel request"}
            </Button>
          )}
          {canAppeal && (
            <Button variant="outline" size="sm" onClick={() => setAppealOpen(true)}>
              Appeal rejection
            </Button>
          )}
        </CardFooter>
      )}

      <TransferNoteDialog
        open={appealOpen}
        onOpenChange={setAppealOpen}
        title="Appeal this rejection"
        description="Explain why the rejected transfer should receive a final superuser review."
        fieldId={`transfer-appeal-${transfer.id}`}
        fieldLabel="Appeal note"
        placeholder="Add context for the final reviewer."
        submitLabel="Submit appeal"
        successMessage="Appeal submitted for final review"
        required={false}
        onSubmit={handleAppeal}
      />
    </Card>
  );
}