class PostImportRunner
  def initialize actor:, rows:, existing: 'skip'
    @actor = actor
    @rows = rows
    @existing = existing == 'error' ? 'error' : 'skip'
  end

  def run
    normalised_rows = PostImportRowNormaliser.normalise!(@rows)

    results = normalised_rows.map { |row| run_row(row) }
    {
      created: results.count { _1[:status] == 'created' },
      skipped: results.count { _1[:status] == 'skipped' },
      failed: results.count { _1[:status] == 'failed' },
      rows: results,
    }
  end

  private

  def run_row row
    attributes = row.fetch('attributes', { }).transform_keys { _1.to_s.underscore }
    preview = PostImportPreviewer.new(existing: @existing)
      .preview_rows(
        rows: [{
          source_row: row['source_row'],
          url: row['url'],
          attributes:,
          provenance: row['provenance'],
          tag_sources: row['tag_sources'],
        }],
        fetch_metadata: false).first
    if @existing == 'skip' && preview[:existing]
      return row.slice('source_row').merge(status: 'skipped')
    end

    if preview[:validation_errors].present?
      return {
        source_row: row['source_row'],
        status: 'failed',
        errors: preview[:validation_errors],
      }
    end

    attributes['tags'] = preview[:attributes]['tags']
    attributes['url'] = row['url']
    post = PostCreator.new(actor: @actor, attributes:).create!
    { source_row: row['source_row'], status: 'created', post: PostRepr.base(post) }
  rescue ActiveRecord::RecordInvalid => e
    { source_row: row['source_row'], status: 'failed', errors: e.record.errors.to_hash }
  rescue Tag::NicoTagNormalisationError
    { source_row: row['source_row'], status: 'failed', errors: { tags: ['ニコニコ・タグは直接指定できません．'] } }
  rescue Tag::DeprecatedTagNormalisationError
    { source_row: row['source_row'], status: 'failed', errors: { tags: ['廃止済みタグは付与できません．'] } }
  rescue ArgumentError, PostCreator::VideoMsParseError
    { source_row: row['source_row'], status: 'failed', errors: { base: ['入力値が不正です．'] } }
  rescue StandardError => e
    Rails.logger.error(
      "post_import_runner_failure #{ { error: e.class.name, message: e.message }.to_json }",
    )
    { source_row: row['source_row'], status: 'failed', errors: { base: ['登録中にエラーが発生しました．'] } }
  end
end