require 'rails_helper'

RSpec.describe 'Unmigrated Wiki compatibility', type: :request do
  let!(:user) { create_member_user! }
  let!(:tag_name) { create(:tag_name, name: 'Help_contract') }
  let!(:page) do
    Wiki::Commit.create_content!(tag_name:, body: 'before', created_by_user: user)
  end
  let!(:first_revision) { page.current_revision }
  let!(:last_revision) do
    Wiki::Commit.content!(page:, body: 'after', created_user: user,
                          message: 'legacy edit', base_revision_id: first_revision.id)
  end

  before { expect(TagDescription.exists?(id: page.id)).to be(false) }

  it 'shows legacy current and historical content by ID' do
    get "/wiki/#{ page.id }"
    expect(response).to have_http_status(:ok)
    expect(json).to include('body' => 'after', 'revision_id' => last_revision.id,
                           'pred' => first_revision.id, 'succ' => nil)
    get "/wiki/#{ page.id }", params: { version: first_revision.id }
    expect(response).to have_http_status(:ok)
    expect(json).to include('body' => 'before', 'revision_id' => first_revision.id,
                           'pred' => nil, 'succ' => last_revision.id)
  end

  it 'shows legacy current and historical content by title' do
    get "/wiki/title/#{ tag_name.name }"
    expect(response).to have_http_status(:ok)
    expect(json).to include('body' => 'after', 'revision_id' => last_revision.id)
    get "/wiki/title/#{ tag_name.name }", params: { version: first_revision.id }
    expect(response).to have_http_status(:ok)
    expect(json).to include('body' => 'before', 'revision_id' => first_revision.id)
  end

  it 'recognises legacy IDs' do
    get "/wiki/#{ page.id }/exists"
    expect(response).to have_http_status(:no_content)
  end

  it 'recognises legacy titles' do
    get "/wiki/title/#{ tag_name.name }/exists"
    expect(response).to have_http_status(:no_content)
  end

  it 'diffs legacy revisions with explicit and current target' do
    [last_revision.id, nil].each do |to|
      get "/wiki/#{ page.id }/diff", params: { from: first_revision.id, to: }
      expect(response).to have_http_status(:ok)
      expect(json).to include(
          'wiki_page_id' => page.id, 'title' => tag_name.name,
          'older_revision_id' => first_revision.id, 'newer_revision_id' => last_revision.id,
          'diff' => [{ 'type' => 'removed', 'content' => 'before' },
                     { 'type' => 'added', 'content' => 'after' }])
    end
  end

  describe 'revision resource scope' do
    let!(:other_page) do
      Wiki::Commit.create_content!(
          tag_name: create(:tag_name, name: 'Help_other_contract'),
          body: 'other page history', created_by_user: user)
    end
    let(:other_revision) { other_page.current_revision }

    it 'returns 404 when show specifies another page revision' do
      get "/wiki/#{ page.id }", params: { version: other_revision.id }
      expect(response).to have_http_status(:not_found)
    end

    it 'returns 404 when diff from belongs to another page' do
      get "/wiki/#{ page.id }/diff",
          params: { from: other_revision.id, to: last_revision.id }
      expect(response).to have_http_status(:not_found)
    end

    it 'returns 404 when diff to belongs to another page' do
      get "/wiki/#{ page.id }/diff",
          params: { from: first_revision.id, to: other_revision.id }
      expect(response).to have_http_status(:not_found)
    end
  end

  it 'retains legacy history metadata and ordering' do
    get '/wiki/changes', params: { id: page.id }
    expect(response).to have_http_status(:ok)
    expect(json.map { |row| row.fetch('revision_id') }).to eq(
        [last_revision.id, first_revision.id])
    expect(json.first).to include(
        'pred' => first_revision.id, 'succ' => nil, 'kind' => 'content',
        'message' => 'legacy edit', 'timestamp' => last_revision.created_at.iso8601(3),
        'wiki_page' => { 'id' => page.id, 'title' => tag_name.name, 'deprecated_at' => nil },
        'user' => { 'id' => user.id, 'name' => user.name })
  end
end