'use client';

import {
  ArrowRight,
  CalendarClock,
  Check,
  Clock3,
  Loader2,
  X,
} from 'lucide-react';

import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from '@/components/ui/alert-dialog';
import { Button } from '@/components/ui/button';
import { Label } from '@/components/ui/label';
import { Textarea } from '@/components/ui/textarea';
import type {
  TicketExtensionRequest,
  TicketExtensionRequestsResponse,
} from '@/types';
import { formatDate } from '@/utils/date';

import {
  MAX_EXTENSION_DECISION_NOTE_LENGTH,
  useExtensionRequestDecision,
} from '../../../../extension-requests/hooks/useExtensionRequestDecision';
import { useTicketExtensionRequestQuery } from '../../../hooks/useTicketQueries';
import { ExtensionRequestHistoryDialog } from './ExtensionRequestHistoryDialog';
import {
  ExtensionRequestDetails,
  getLatestRequest,
} from './TicketExtensionRequestPanel';
import { TicketActionCard } from './TicketActionCard';

function getPendingRequest(response: TicketExtensionRequestsResponse) {
  return response.items
    .filter((request) => request.status === 'pending')
    .reduce<TicketExtensionRequest | null>((latest, request) => {
      if (!latest) return request;
      return new Date(request.requested_at) > new Date(latest.requested_at)
        ? request
        : latest;
    }, null);
}

function getExtensionDays(request: TicketExtensionRequest) {
  const difference =
    new Date(request.requested_due_at).getTime() -
    new Date(request.current_due_at).getTime();
  return Math.max(0, Math.ceil(difference / (24 * 60 * 60 * 1000)));
}

function Requester({ request }: { request: TicketExtensionRequest }) {
  const name = request.requested_by?.name ?? 'Assigned worker';
  const initials = name
    .split(/\s+/)
    .slice(0, 2)
    .map((part) => part[0]?.toUpperCase())
    .join('');

  return (
    <div className="grid grid-cols-2 gap-3 rounded-lg bg-muted/40 p-3">
      <div className="flex items-center gap-2">
        <span className="flex size-8 shrink-0 items-center justify-center rounded-full bg-primary/15 text-xs font-semibold text-primary">
          {initials || 'W'}
        </span>
        <div className="min-w-0">
          <p className="text-[11px] text-muted-foreground">Requested By</p>
          <p className="truncate text-sm font-medium">{name}</p>
        </div>
      </div>
      <div>
        <p className="text-[11px] text-muted-foreground">Requested On</p>
        <p className="text-sm font-medium">
          {formatDate(request.requested_at)}
        </p>
      </div>
    </div>
  );
}

function ExtensionReviewForm({
  ticketId,
  assignmentId,
  request,
  requests,
}: {
  ticketId: string;
  assignmentId: number;
  request: TicketExtensionRequest;
  requests: TicketExtensionRequest[];
}) {
  const {
    note,
    setNote,
    noteError,
    selectedAction,
    isPending,
    isRejectConfirmationOpen,
    setIsRejectConfirmationOpen,
    submitDecision,
    requestRejection,
  } = useExtensionRequestDecision({ ticketId, assignmentId });
  const extensionDays = getExtensionDays(request);

  return (
    <TicketActionCard
      icon={CalendarClock}
      title="Extension Request Details"
      contextLabel={`Lot ${assignmentId}`}
    >
      <div className="space-y-4">
        <Requester request={request} />

        <section className="space-y-2">
          <p className="text-xs font-semibold">Request Summary</p>
          <div className="grid grid-cols-[minmax(0,1fr)_auto_minmax(0,1fr)] items-start gap-3 rounded-lg border p-3">
            <div>
              <p className="text-[11px] text-muted-foreground">
                Current Due Date
              </p>
              <p className="text-xs font-medium">
                {formatDate(request.current_due_at)}
              </p>
            </div>
            <ArrowRight className="mt-6 size-4 text-muted-foreground" />
            <div>
              <p className="text-[11px] text-muted-foreground">
                Requested Due Date
              </p>
              <p className="text-xs font-medium">
                {formatDate(request.requested_due_at)}
              </p>
              {extensionDays > 0 ? (
                <span className="mt-1 inline-flex rounded-full bg-emerald-100 px-2 py-0.5 text-[10px] font-semibold text-emerald-700 dark:bg-emerald-950/50 dark:text-emerald-300">
                  +{extensionDays} {extensionDays === 1 ? 'Day' : 'Days'}
                </span>
              ) : null}
            </div>
          </div>
          <div className="rounded-lg border p-3">
            <p className="text-[11px] text-muted-foreground">Reason</p>
            <p className="mt-1 text-sm leading-relaxed">{request.reason}</p>
          </div>
        </section>

        <div className="space-y-2">
          <div className="space-y-0.5">
            <Label htmlFor="extension-manager-note">Add Manager Comments</Label>
            <p className="text-xs text-muted-foreground">
              Required for rejection and optional for approval.
            </p>
          </div>
          <div className="relative">
            <Textarea
              id="extension-manager-note"
              value={note}
              onChange={(event) => {
                setNote(event.target.value);
              }}
              placeholder="Add a note explaining your decision..."
              disabled={isPending}
              aria-invalid={Boolean(noteError)}
              aria-describedby={
                noteError ? 'extension-manager-note-error' : undefined
              }
              className="min-h-24 resize-none pb-8"
            />
            <span className="pointer-events-none absolute right-3 bottom-2 text-xs text-muted-foreground">
              {note.length} / {MAX_EXTENSION_DECISION_NOTE_LENGTH}
            </span>
          </div>
          {noteError ? (
            <p
              id="extension-manager-note-error"
              className="text-xs text-destructive"
            >
              {noteError}
            </p>
          ) : null}
        </div>

        <div className="grid grid-cols-2 gap-3">
          <Button
            type="button"
            variant="outline"
            className="border-destructive/40 text-destructive hover:bg-destructive/5 hover:text-destructive"
            disabled={isPending}
            onClick={requestRejection}
          >
            {selectedAction === 'reject' ? (
              <Loader2 className="animate-spin" />
            ) : (
              <X />
            )}
            Reject Request
          </Button>
          <Button
            type="button"
            disabled={isPending}
            onClick={() => void submitDecision('approve')}
          >
            {selectedAction === 'approve' ? (
              <Loader2 className="animate-spin" />
            ) : (
              <Check />
            )}
            Approve Extension
          </Button>
        </div>

        <ExtensionRequestHistoryDialog requests={requests} />

        <AlertDialog
          open={isRejectConfirmationOpen}
          onOpenChange={setIsRejectConfirmationOpen}
        >
          <AlertDialogContent>
            <AlertDialogHeader>
              <AlertDialogTitle>Reject extension request?</AlertDialogTitle>
              <AlertDialogDescription>
                Are you sure you want to reject this extension request? This
                decision cannot be undone.
              </AlertDialogDescription>
            </AlertDialogHeader>
            <AlertDialogFooter>
              <AlertDialogCancel disabled={isPending}>No</AlertDialogCancel>
              <AlertDialogAction
                variant="destructive"
                disabled={isPending}
                onClick={() => void submitDecision('reject')}
              >
                Yes
              </AlertDialogAction>
            </AlertDialogFooter>
          </AlertDialogContent>
        </AlertDialog>
      </div>
    </TicketActionCard>
  );
}

export function ReviewExtensionRequestAction({
  ticketId,
  assignmentId,
  canReview,
}: {
  ticketId: string;
  assignmentId: number;
  canReview: boolean;
}) {
  const extensionRequestQuery = useTicketExtensionRequestQuery(
    ticketId,
    assignmentId,
  );

  if (extensionRequestQuery.isError) {
    return null;
  }

  if (extensionRequestQuery.isLoading) {
    return (
      <TicketActionCard
        icon={Clock3}
        title="Extension Request"
        contextLabel={`Lot ${assignmentId}`}
      >
        <div className="flex items-center justify-center py-8 text-muted-foreground">
          <Loader2 className="mr-2 size-4 animate-spin" />
          <span className="text-sm">Checking for requests...</span>
        </div>
      </TicketActionCard>
    );
  }

  const pendingRequest = extensionRequestQuery.data
    ? getPendingRequest(extensionRequestQuery.data)
    : null;

  const requests = extensionRequestQuery.data?.items ?? [];

  if (!pendingRequest || !canReview) {
    const latestRequest = extensionRequestQuery.data
      ? getLatestRequest(extensionRequestQuery.data)
      : null;

    if (!latestRequest) return null;

    return (
      <TicketActionCard
        icon={CalendarClock}
        title="Extension Request"
        contextLabel={`Lot ${assignmentId}`}
      >
        <ExtensionRequestDetails request={latestRequest} requests={requests} />
      </TicketActionCard>
    );
  }

  return (
    <ExtensionReviewForm
      ticketId={ticketId}
      assignmentId={assignmentId}
      request={pendingRequest}
      requests={requests}
    />
  );
}