import React from 'react'
import type { ArticleDraft } from '@/lib/articlePublisher'
import type { ArticleCategory } from '@/types/nostr'
import { ArticleField } from './ArticleField'
import { CategorySelect } from './CategorySelect'
import { t } from '@/lib/i18n'

interface ArticleFieldsLeftProps {
  draft: ArticleDraft
  onDraftChange: (draft: ArticleDraft) => void
  seriesOptions?: { id: string; title: string }[] | undefined
  onSelectSeries?: ((seriesId: string | undefined) => void) | undefined
}

export function ArticleFieldsLeft({
  draft,
  onDraftChange,
  seriesOptions,
  onSelectSeries,
}: ArticleFieldsLeftProps): React.ReactElement {
  return (
    <div className="space-y-4">
      <CategoryField
        value={draft.category}
        onChange={buildCategoryChangeHandler({ draft, onDraftChange })}
      />
      {seriesOptions && (
        <SeriesSelect
          draft={draft}
          onDraftChange={onDraftChange}
          seriesOptions={seriesOptions}
          onSelectSeries={onSelectSeries}
        />
      )}
      <ArticleTitleField draft={draft} onDraftChange={onDraftChange} />
      <ArticlePreviewField draft={draft} onDraftChange={onDraftChange} />
    </div>
  )
}

interface CategoryFieldProps {
  value: ArticleDraft['category']
  onChange: (value: ArticleCategory | undefined) => void
}

function CategoryField({ value, onChange }: CategoryFieldProps): React.ReactElement {
  return (
    <CategorySelect
      id="category"
      label={t('article.editor.category')}
      {...(value ? { value } : {})}
      onChange={onChange}
      required
      helpText={t('article.editor.category.help')}
    />
  )
}

interface BuildCategoryChangeHandlerParams {
  draft: ArticleDraft
  onDraftChange: (draft: ArticleDraft) => void
}

function buildCategoryChangeHandler(
  params: BuildCategoryChangeHandlerParams
): (value: ArticleCategory | undefined) => void {
  return (value): void => {
    if (value !== 'science-fiction' && value !== 'scientific-research' && value !== undefined) {
      return
    }

    if (value) {
      params.onDraftChange({ ...params.draft, category: value })
      return
    }

    const { category: _category, ...rest } = params.draft
    params.onDraftChange(rest)
  }
}

function ArticleTitleField({
  draft,
  onDraftChange,
}: {
  draft: ArticleDraft
  onDraftChange: (draft: ArticleDraft) => void
}): React.ReactElement {
  return (
    <ArticleField
      id="title"
      label={t('article.title')}
      value={draft.title}
      onChange={(value) => onDraftChange({ ...draft, title: value as string })}
      required
      placeholder={t('article.editor.title.placeholder')}
    />
  )
}

function ArticlePreviewField({
  draft,
  onDraftChange,
}: {
  draft: ArticleDraft
  onDraftChange: (draft: ArticleDraft) => void
}): React.ReactElement {
  return (
    <ArticleField
      id="preview"
      label={t('article.editor.preview.label')}
      value={draft.preview}
      onChange={(value) => onDraftChange({ ...draft, preview: value as string })}
      required
      type="textarea"
      rows={4}
      placeholder={t('article.editor.preview.placeholder')}
      helpText={t('article.editor.preview.help')}
    />
  )
}

function SeriesSelect({
  draft,
  onDraftChange,
  seriesOptions,
  onSelectSeries,
}: {
  draft: ArticleDraft
  onDraftChange: (draft: ArticleDraft) => void
  seriesOptions: { id: string; title: string }[]
  onSelectSeries?: ((seriesId: string | undefined) => void) | undefined
}): React.ReactElement {
  const handleChange = buildSeriesChangeHandler({ draft, onDraftChange, onSelectSeries })

  return (
    <div>
      <label htmlFor="series" className="block text-sm font-medium text-gray-700">
        {t('article.editor.series.label')}
      </label>
      <select
        id="series"
        className="mt-1 block w-full border-gray-300 rounded-md shadow-sm"
        value={draft.seriesId ?? ''}
        onChange={handleChange}
      >
        <option value="">{t('article.editor.series.none')}</option>
        {seriesOptions.map((s) => (
          <option key={s.id} value={s.id}>
            {s.title}
          </option>
        ))}
      </select>
    </div>
  )
}

interface BuildSeriesChangeHandlerParams {
  draft: ArticleDraft
  onDraftChange: (draft: ArticleDraft) => void
  onSelectSeries?: ((seriesId: string | undefined) => void) | undefined
}

function buildSeriesChangeHandler(
  params: BuildSeriesChangeHandlerParams
): (e: React.ChangeEvent<HTMLSelectElement>) => void {
  return (e): void => {
    const value = e.target.value === '' ? undefined : e.target.value

    if (value) {
      params.onDraftChange({ ...params.draft, seriesId: value })
      params.onSelectSeries?.(value)
      return
    }

    const { seriesId: _seriesId, ...rest } = params.draft
    params.onDraftChange(rest)
    params.onSelectSeries?.(undefined)
  }
}