import { Button, Group, Select, Stack, Text } from '@mantine/core';
import { IconPlus } from '@tabler/icons-react';
import { useTranslation } from 'react-i18next';
import { useLocalized, type LicenseType, type Rank } from '@ema-platform/api';
import { groupedTypeOptions } from '../config/designer';

interface Props {
  licenseTypes: LicenseType[];
  typeId: string | null;
  onTypeChange: (id: string | null) => void;
  /** The selected licence type's rank ladder — empty for non-CoC/CoP types. */
  ranks: Rank[];
  rankId: string | null;
  onRankChange: (id: string | null) => void;
  /** Shown for context only; edited on Certificate Requirements → Behaviour. */
  validityMonths: number;
  /** Non-null when the type is configured in days rather than months. */
  validityDays?: number | null;
  canEdit: boolean;
  onNewVersion: () => void;
}

/** Licence type, certificate validity, and the entry point for a new version. */
export function DesignerToolbar({
  licenseTypes,
  typeId,
  onTypeChange,
  ranks,
  rankId,
  onRankChange,
  validityMonths,
  validityDays,
  canEdit,
  onNewVersion,
}: Props) {
  const { t } = useTranslation();
  const localized = useLocalized();

  return (
    <Group align="flex-end" mb="md" gap="sm">
      {/* Grouped and searchable because the catalogue is 80+ types, over 50 of
          them STCW certificates: a flat list buries the CoC/CoP a user is
          looking for among the logistics operator licences. */}
      <Select
        label={t('designer.licenceType', 'Licence type')}
        data={groupedTypeOptions(licenseTypes, localized, t)}
        value={typeId}
        onChange={onTypeChange}
        searchable
        nothingFoundMessage={t('designer.noTypeMatch', 'No licence type matches')}
        maxDropdownHeight={340}
        w={340}
      />

      {/* CoC/CoP only — a rank can carry its own design (e.g. Master's
          certificate differs from an OOW's). "Default" (null) is the design
          every other rank under the type falls back to. */}
      {ranks.length > 0 && (
        <Select
          label={t('designer.rank', 'Rank')}
          description={t('designer.rankHint', 'Leave as Default to design for every rank')}
          data={[
            { value: '', label: t('designer.rankDefault', 'Default (all ranks)') },
            ...ranks.map((r) => ({ value: r.id, label: localized(r.name) })),
          ]}
          value={rankId ?? ''}
          onChange={(value) => onRankChange(value || null)}
          w={220}
        />
      )}

      {/* Read-only here. Validity is one policy decision with the renewal
          window and the expiry reminders, so it is edited in one place —
          Certificate Requirements → Behaviour — rather than from two screens
          behind two different permissions. Still shown, because a designer
          laying out a certificate that prints an expiry needs to see the term
          it promises. */}
      {typeId && (
        <Stack gap={2}>
          <Text size="xs" c="dimmed" fw={500}>
            {t('designer.validity', 'Valid for')}
          </Text>
          <Group gap={6} align="baseline">
            <Text size="sm" fw={600}>
              {validityDays != null
                ? t('designer.validityDays', '{{count}} days', { count: validityDays })
                : t('designer.validityMonths', '{{count}} months', {
                    count: validityMonths,
                  })}
            </Text>
            <Text size="xs" c="dimmed">
              {t('designer.validityEditedOn', '— set on Certificate Requirements → Behaviour')}
            </Text>
          </Group>
        </Stack>
      )}

      <div style={{ flex: 1 }} />

      <Button
        leftSection={<IconPlus size={16} />}
        disabled={!canEdit || !typeId}
        onClick={onNewVersion}
      >
        {t('designer.newVersion', 'New version')}
      </Button>
    </Group>
  );
}
