'use client';

/**
 * Per-category send-from routing matrix.
 *
 * Renders one row per email category with a `noreply | sales` dropdown.
 * When the port has no sales SMTP credentials configured, the `sales`
 * option is disabled across the board and the card explains why.
 */
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { Loader2 } from 'lucide-react';
import { toast } from 'sonner';

import { Button } from '@/components/ui/button';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { WarningCallout } from '@/components/ui/warning-callout';
import { apiFetch } from '@/lib/api/client';
import { toastError } from '@/lib/api/toast-error';

type Sender = 'noreply' | 'sales';

interface RoutingResponse {
  data: {
    routing: Record<string, Sender>;
    isSalesAvailable: boolean;
    categories: readonly string[];
  };
}

const LABELS: Record<string, string> = {
  account_activation: 'Account activation',
  password_reset: 'Password reset',
  notification_digest: 'Notification digest',
  eoi_signing_request: 'EOI signing request',
  reservation_signing_request: 'Reservation signing request',
  contract_signing_request: 'Contract signing request',
  brochure_send: 'Brochure send',
  berth_pdf_send: 'Berth PDF send',
  signed_doc_completion: 'Signed-doc completion',
  sales_sendout: 'Sales send-out',
  manual_compose: 'Manual rep compose',
  inquiry_confirmation: 'Inquiry confirmation (to client)',
  inquiry_sales_notification: 'Inquiry notification (to sales)',
  crm_invite: 'CRM user invite',
  admin_email_change: 'Admin email-change notice',
  gdpr_export: 'GDPR export delivery',
  system_other: 'Other system-generated',
};

export function EmailRoutingCard() {
  const qc = useQueryClient();
  const { data, isLoading, isError } = useQuery<RoutingResponse>({
    queryKey: ['admin', 'email', 'routing'],
    queryFn: () => apiFetch<RoutingResponse>('/api/v1/admin/email/routing'),
    staleTime: 30_000,
  });

  const update = useMutation({
    mutationFn: (routing: Record<string, Sender>) =>
      apiFetch<RoutingResponse>('/api/v1/admin/email/routing', {
        method: 'PATCH',
        body: { routing },
      }),
    onSuccess: (resp) => {
      qc.setQueryData(['admin', 'email', 'routing'], resp);
      toast.success('Send-from routing saved');
    },
    onError: (err) => toastError(err, 'Failed to save send-from routing'),
  });

  if (isLoading) {
    return (
      <Card>
        <CardHeader>
          <CardTitle>Send-from routing</CardTitle>
        </CardHeader>
        <CardContent>
          <Loader2 className="size-4 animate-spin" aria-hidden />
        </CardContent>
      </Card>
    );
  }

  if (isError || !data) {
    return (
      <Card>
        <CardHeader>
          <CardTitle>Send-from routing</CardTitle>
        </CardHeader>
        <CardContent>
          <p className="text-sm text-muted-foreground">Failed to load routing matrix.</p>
        </CardContent>
      </Card>
    );
  }

  const { routing, isSalesAvailable, categories } = data.data;

  const setCategory = (category: string, sender: Sender) => {
    update.mutate({ ...routing, [category]: sender });
  };

  return (
    <Card>
      <CardHeader>
        <CardTitle>Send-from routing</CardTitle>
        <CardDescription>
          Pick which account each email category sends from. Automated traffic typically goes
          through <code className="rounded bg-muted px-1 text-xs">noreply</code>; human-touch
          traffic (brochures, send-outs) goes through{' '}
          <code className="rounded bg-muted px-1 text-xs">sales</code>.
        </CardDescription>
      </CardHeader>
      <CardContent className="space-y-4">
        {!isSalesAvailable ? (
          <WarningCallout>
            <p className="text-sm">
              Sales sender is disabled - configure SMTP credentials in the &quot;Sales send-from
              account&quot; card below to enable the <code>sales</code> option.
            </p>
          </WarningCallout>
        ) : null}
        <div className="grid grid-cols-1 gap-3 sm:grid-cols-[1fr_180px]">
          {categories.map((cat) => (
            <div
              key={cat}
              className="contents [&>*]:flex [&>*]:items-center [&>*]:border-b [&>*]:border-border [&>*]:py-2"
            >
              <div className="text-sm font-medium">{LABELS[cat] ?? cat}</div>
              <div>
                <Select
                  value={routing[cat] ?? 'noreply'}
                  onValueChange={(v) => setCategory(cat, v as Sender)}
                  disabled={update.isPending}
                >
                  <SelectTrigger className="h-9">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="noreply">noreply</SelectItem>
                    <SelectItem value="sales" disabled={!isSalesAvailable}>
                      sales {!isSalesAvailable ? '(not configured)' : ''}
                    </SelectItem>
                  </SelectContent>
                </Select>
              </div>
            </div>
          ))}
        </div>
        <p className="text-xs text-muted-foreground">
          Changes save automatically when you pick a new sender. The <code>sales</code> option falls
          back to <code>noreply</code> at send-time if creds are removed.
        </p>
        {update.isPending ? (
          <div className="flex items-center gap-2 text-xs text-muted-foreground">
            <Loader2 className="size-3 animate-spin" aria-hidden /> Saving…
          </div>
        ) : null}
      </CardContent>
      <CardContent className="pt-0">
        <Button
          type="button"
          variant="ghost"
          size="sm"
          onClick={() =>
            update.mutate({
              account_activation: 'noreply',
              password_reset: 'noreply',
              notification_digest: 'noreply',
              eoi_signing_request: 'noreply',
              reservation_signing_request: 'noreply',
              contract_signing_request: 'noreply',
              brochure_send: 'sales',
              berth_pdf_send: 'sales',
              signed_doc_completion: 'sales',
              sales_sendout: 'sales',
              manual_compose: 'sales',
              inquiry_confirmation: 'noreply',
              inquiry_sales_notification: 'noreply',
              crm_invite: 'noreply',
              admin_email_change: 'noreply',
              gdpr_export: 'noreply',
              system_other: 'noreply',
            })
          }
          disabled={update.isPending}
        >
          Reset to defaults
        </Button>
      </CardContent>
    </Card>
  );
}