require 'rails_helper'

RSpec.describe 'Post history privacy', type: :request do
  let(:origin) { Time.utc(2020, 1, 1) }
  let!(:post_record) do
    create(:post, title: 'current', created_at: origin, updated_at: origin)
  end
  let!(:other_post) do
    create(:post, created_at: origin, updated_at: origin + 3.days + 1.hour)
  end
  let!(:tag) { create(:tag, primary_name: 'private-history-tag') }
  let!(:external) { create(:external_tag, name: 'external-history-tag') }

  before do
    ['create', 'discard'].each_with_index do |event, index|
      TagVersion.create!(tag:, version_no: index + 1, event_type: event,
          name: 'private-history-tag', category: 'general', aliases: '', parent_tag_ids: '',
          names: { ja: { name: 'private-history-tag', script_code: 'Jpan',
                         auto_generated: false, aliases: [] } },
          created_at: origin + index.hours)
    end
    NicoTagVersion.create!(external_tag: external, version_no: 1, event_type: 'create',
        name: 'nico:external-history-tag', linked_tags: 'private-history-tag',
        created_at: origin)
    ['create', 'discard', 'restore', 'update'].each_with_index do |event, index|
      snapshots =
          if index < 2
            [{ tag_id: tag.id, version_no: 1, name: 'private-history-tag', sections: [] }]
          elsif index == 3
            [{ external_tag_id: external.id }]
          else
            []
          end
      PostVersion.create!(post: post_record, version_no: index + 1, event_type: event,
          title: "version #{ index + 1 }", url: post_record.url, tags: '',
          tags_json: snapshots, parent_post_ids: '', created_at: origin + (index + 1).days)
    end
  end

  ['anonymous', 'member', 'admin'].each do |role|
    context "as #{ role }" do
      before do
        sign_in_as(create(:user, role.to_sym)) unless role == 'anonymous'
      end

      it 'uses only authorised history timestamps for display' do
        get '/posts'
        expect(response).to have_http_status(:ok)
        row = response.parsed_body.fetch('posts').find { _1.fetch('id') == post_record.id }
        expected = origin + (role == 'admin' ? 4 : 3).days
        expect(Time.zone.parse(row.fetch('updated_at'))).to eq(expected)
      end

      it 'uses the same visibility for date bounds and count' do
        get '/posts', params: { updated_from: (origin + 4.days).iso8601,
                                updated_to: (origin + 4.days).iso8601 }
        expect(response).to have_http_status(:ok)
        ids = response.parsed_body.fetch('posts').pluck('id')
        expect(ids).to eq(role == 'admin' ? [post_record.id] : [])
        expect(response.parsed_body.fetch('count')).to eq(ids.length)
      end

      it 'sorts using authorised timestamps in both directions' do
        ['asc', 'desc'].each do |direction|
          get '/posts', params: { order: "updated_at:#{ direction }" }
          expect(response).to have_http_status(:ok)
          expected = role == 'admin' ? [other_post.id, post_record.id] :
              [post_record.id, other_post.id]
          expected.reverse! if direction == 'desc'
          expect(response.parsed_body.fetch('posts').pluck('id')).to eq(expected)
        end
      end

      it 'counts only visible versions and masks a private previous version' do
        get '/posts/versions', params: { post: post_record.id }
        expect(response).to have_http_status(:ok)
        body = response.parsed_body
        expected = role == 'admin' ? [4, 3, 2, 1] : [3]
        expect(body.fetch('count')).to eq(expected.length)
        expect(body.fetch('versions').pluck('version_no')).to eq(expected)
        restored = body.fetch('versions').find { _1.fetch('version_no') == 3 }
        expect(restored.fetch('title').fetch('prev')).to eq(role == 'admin' ? 'version 2' : nil)
      end

      it 'uses only an authorised previous version for tag filtering' do
        get '/posts/versions', params: { post: post_record.id, tag: tag.id }
        expect(response).to have_http_status(:ok)
        expected = role == 'admin' ? [3, 2, 1] : []
        expect(response.parsed_body.fetch('versions').pluck('version_no')).to eq(expected)
        expect(response.parsed_body.fetch('count')).to eq(expected.length)
      end
    end
  end
end