import {
  ActionIcon,
  Button,
  ColorInput,
  Group,
  NumberInput,
  Paper,
  SegmentedControl,
  Select,
  Stack,
  Text,
  TextInput,
  Tooltip,
} from '@mantine/core';
import { IconBold, IconItalic, IconTrash } from '@tabler/icons-react';
import { useTranslation } from 'react-i18next';
import type { TemplateFieldPlacement, TemplateVariable } from '@ema-platform/api';

interface Props {
  block: TemplateFieldPlacement | null;
  variables: TemplateVariable[];
  onChange: (block: TemplateFieldPlacement) => void;
  onDelete: (id: string) => void;
  disabled: boolean;
}

/** Everything about the selected block that is not its position on the page. */
export function BlockPropertiesPanel({
  block,
  variables,
  onChange,
  onDelete,
  disabled,
}: Props) {
  const { t } = useTranslation();

  if (!block) {
    return (
      <Paper withBorder p="md" radius="md">
        <Text size="sm" c="dimmed">
          {t('designer.noBlockSelected', 'Select a block on the page to edit it.')}
        </Text>
      </Paper>
    );
  }

  const current = block;
  const isLiteral = current.variable === null;
  const isImage = current.type === 'image';
  const variableByKey = new Map(variables.map((v) => [v.key, v]));

  const selectVariable = (key: string | null) => {
    if (!key) return;
    const kind: 'text' | 'image' =
      variableByKey.get(key)?.kind === 'image' ? 'image' : 'text';
    onChange({ ...current, variable: key, type: kind });
  };

  return (
    <Paper withBorder p="md" radius="md">
      <Stack gap="sm">
        <Group justify="space-between" align="center">
          <Text fw={600} size="sm">
            {t('designer.blockProperties', 'Selected block')}
          </Text>
          <Tooltip label={t('designer.deleteBlock', 'Remove block')}>
            <ActionIcon
              variant="subtle"
              color="red"
              disabled={disabled}
              onClick={() => onDelete(block.id)}
            >
              <IconTrash size={16} />
            </ActionIcon>
          </Tooltip>
        </Group>

        <SegmentedControl
          fullWidth
          size="xs"
          value={isLiteral ? 'text' : 'variable'}
          disabled={disabled}
          onChange={(value) =>
            value === 'text'
              ? onChange({ ...block, variable: null, type: 'text', text: block.text ?? '' })
              : selectVariable(variables[0]?.key ?? 'companyName')
          }
          data={[
            { value: 'variable', label: t('designer.blockVariable', 'Variable') },
            { value: 'text', label: t('designer.blockText', 'Fixed text') },
          ]}
        />

        {isLiteral ? (
          <TextInput
            label={t('designer.blockTextLabel', 'Text')}
            value={block.text ?? ''}
            onChange={(e) => onChange({ ...block, text: e.currentTarget.value })}
            disabled={disabled}
          />
        ) : (
          <Select
            label={t('designer.blockVariableLabel', 'Variable')}
            data={variables.map((variable) => ({
              value: variable.key,
              label: variable.kind === 'image' ? `🖼 ${variable.label}` : variable.label,
            }))}
            value={block.variable}
            onChange={selectVariable}
            searchable
            disabled={disabled}
          />
        )}

        <Group gap="xs" grow>
          {!isImage && (
            <NumberInput
              label={t('designer.blockFontSize', 'Font size')}
              value={block.fontSize ?? 14}
              onChange={(value) => onChange({ ...block, fontSize: Number(value) || 14 })}
              min={4}
              max={200}
              disabled={disabled}
            />
          )}
          <NumberInput
            label={t('designer.blockWidth', 'Width (%)')}
            value={block.widthPct}
            onChange={(value) =>
              onChange({ ...block, widthPct: Math.min(100, Math.max(1, Number(value) || 1)) })
            }
            min={1}
            max={100}
            disabled={disabled}
          />
        </Group>

        <NumberInput
          label={t('designer.blockPage', 'Page')}
          description={t('designer.blockPageHint', 'Which sheet of the document this block prints on')}
          value={(block.page ?? 0) + 1}
          onChange={(value) => {
            const index = Math.max(0, Math.min(63, Math.floor(Number(value) || 1) - 1));
            // Omitted on the first page so a single-page design stays as it was.
            const { page: _page, ...rest } = block;
            onChange(index > 0 ? { ...rest, page: index } : rest);
          }}
          min={1}
          max={64}
          disabled={disabled}
        />

        <Group gap="xs" grow>
          <NumberInput
            label={t('designer.blockX', 'X (%)')}
            value={block.xPct}
            onChange={(value) =>
              onChange({ ...block, xPct: Math.min(100, Math.max(0, Number(value) || 0)) })
            }
            min={0}
            max={100}
            decimalScale={2}
            disabled={disabled}
          />
          <NumberInput
            label={t('designer.blockY', 'Y (%)')}
            value={block.yPct}
            onChange={(value) =>
              onChange({ ...block, yPct: Math.min(100, Math.max(0, Number(value) || 0)) })
            }
            min={0}
            max={100}
            decimalScale={2}
            disabled={disabled}
          />
        </Group>

        {!isImage && (
          <>
            <SegmentedControl
              fullWidth
              size="xs"
              value={block.align ?? 'left'}
              disabled={disabled}
              onChange={(value) =>
                onChange({ ...block, align: value as TemplateFieldPlacement['align'] })
              }
              data={[
                { value: 'left', label: t('designer.alignLeft', 'Left') },
                { value: 'center', label: t('designer.alignCenter', 'Centre') },
                { value: 'right', label: t('designer.alignRight', 'Right') },
                { value: 'justify', label: t('designer.alignJustify', 'Justify') },
              ]}
            />

            <Group gap="xs">
              <Button
                size="xs"
                variant={block.fontWeight === 'bold' ? 'filled' : 'default'}
                disabled={disabled}
                onClick={() =>
                  onChange({
                    ...block,
                    fontWeight: block.fontWeight === 'bold' ? 'normal' : 'bold',
                  })
                }
              >
                <IconBold size={14} />
              </Button>
              <Button
                size="xs"
                variant={block.fontStyle === 'italic' ? 'filled' : 'default'}
                disabled={disabled}
                onClick={() =>
                  onChange({
                    ...block,
                    fontStyle: block.fontStyle === 'italic' ? 'normal' : 'italic',
                  })
                }
              >
                <IconItalic size={14} />
              </Button>
            </Group>

            <ColorInput
              label={t('designer.blockColor', 'Colour')}
              value={block.color ?? '#111111'}
              onChange={(value) => onChange({ ...block, color: value })}
              disabled={disabled}
              format="hex"
            />
          </>
        )}
      </Stack>
    </Paper>
  );
}