require 'rails_helper'
require 'active_support/testing/time_helpers'


RSpec.describe 'Theatres API', type: :request do
  include ActiveSupport::Testing::TimeHelpers

  around do |example|
    travel_to(Time.zone.parse('2026-03-18 21:00:00')) do
      example.run
    end
  end

  let(:member) { create(:user, :member, name: 'member user') }
  let(:other_user) { create(:user, :member, name: 'other user') }

  let!(:youtube_post) do
    Post.create!(
      title: 'youtube post',
      url: 'https://www.youtube.com/watch?v=spec123'
    )
  end

  let!(:other_post) do
    Post.create!(
      title: 'other post',
      url: 'https://example.com/posts/1'
    )
  end

  let!(:theatre) do
    Theatre.create!(
      name: 'spec theatre',
      opens_at: Time.zone.parse('2026-03-18 20:00:00'),
      kind: 0,
      created_by_user: member
    )
  end

  describe 'GET /theatres/:id' do
    subject(:do_request) do
      get "/theatres/#{theatre_id}"
    end

    context 'when theatre exists' do
      let(:theatre_id) { theatre.id }

      it 'returns theatre json' do
        do_request

        expect(response).to have_http_status(:ok)
        expect(json).to include(
          'id' => theatre.id,
          'name' => 'spec theatre'
        )
        expect(json).to have_key('opens_at')
        expect(json).to have_key('closes_at')
        expect(json).to have_key('created_at')
        expect(json).to have_key('updated_at')

        expect(json['created_by_user']).to include(
          'id' => member.id,
          'name' => 'member user'
        )
      end
    end

    context 'when theatre does not exist' do
      let(:theatre_id) { 999_999_999 }

      it 'returns 404' do
        do_request
        expect(response).to have_http_status(:not_found)
      end
    end
  end

  describe 'PUT /theatres/:id/watching' do
    subject(:do_request) do
      put "/theatres/#{theatre_id}/watching"
    end

    let(:theatre_id) { theatre.id }

    context 'when not logged in' do
      it 'returns 401' do
        sign_out
        do_request
        expect(response).to have_http_status(:unauthorized)
      end
    end

    context 'when theatre does not exist' do
      let(:theatre_id) { 999_999_999 }

      it 'returns 404' do
        sign_in_as(member)
        do_request
        expect(response).to have_http_status(:not_found)
      end
    end

    context 'when theatre has no host yet' do
      before do
        sign_in_as(member)
      end

      it 'creates watching row, assigns current user as host, and returns current theatre info' do
        expect { do_request }
          .to change { TheatreWatchingUser.count }.by(1)

        expect(response).to have_http_status(:ok)

        theatre.reload
        watch = TheatreWatchingUser.find_by!(theatre: theatre, user: member)

        expect(theatre.host_user_id).to eq(member.id)
        expect(watch.expires_at).to be_within(1.second).of(30.seconds.from_now)

        expect(json).to include(
          'host_flg' => true,
          'post_id' => nil,
          'post_started_at' => nil
        )

        expect(json.fetch('watching_users')).to contain_exactly(
          {
            'id' => member.id,
            'name' => 'member user'
          }
        )
      end
    end

    context 'when current user is already watching' do
      let!(:watching_row) do
        TheatreWatchingUser.create!(
          theatre: theatre,
          user: member,
          expires_at: 5.seconds.from_now
        )
      end

      before do
        sign_in_as(member)
      end

      it 'refreshes expires_at without creating another row' do
        expect { do_request }
          .not_to change { TheatreWatchingUser.count }

        expect(response).to have_http_status(:ok)

        expect(watching_row.reload.expires_at)
          .to be_within(1.second).of(30.seconds.from_now)
      end
    end

    context 'when another active host exists' do
      before do
        TheatreWatchingUser.create!(
          theatre: theatre,
          user: other_user,
          expires_at: 10.minutes.from_now
        )
        theatre.update!(host_user: other_user)
        sign_in_as(member)
      end

      it 'does not steal host and returns host_flg false' do
        expect { do_request }
          .to change { TheatreWatchingUser.count }.by(1)

        expect(response).to have_http_status(:ok)
        expect(theatre.reload.host_user_id).to eq(other_user.id)

        expect(json).to include(
          'host_flg' => false,
          'post_id' => nil,
          'post_started_at' => nil
        )

        expect(json.fetch('watching_users')).to contain_exactly(
          {
            'id' => member.id,
            'name' => 'member user'
          },
          {
            'id' => other_user.id,
            'name' => 'other user'
          }
        )
      end
    end

    context 'when host is set but no longer actively watching' do
      let(:started_at) { 2.minutes.ago }

      before do
        TheatreWatchingUser.create!(
          theatre: theatre,
          user: other_user,
          expires_at: 1.second.ago
        )
        theatre.update!(
          host_user: other_user,
          current_post: youtube_post,
          current_post_started_at: started_at
        )
        sign_in_as(member)
      end

      it 'reassigns host to current user and returns current post info' do
        expect { do_request }
          .to change { TheatreWatchingUser.count }.by(1)

        expect(response).to have_http_status(:ok)

        theatre.reload
        expect(theatre.host_user_id).to eq(member.id)

        expect(json['host_flg']).to eq(true)
        expect(json['post_id']).to eq(youtube_post.id)
        expect(Time.zone.parse(json['post_started_at']))
          .to be_within(1.second).of(started_at)
      end
    end
  end

  describe 'PATCH /theatres/:id/next_post' do
    subject(:do_request) do
      patch "/theatres/#{theatre_id}/next_post"
    end

    let(:theatre_id) { theatre.id }

    context 'when not logged in' do
      it 'returns 401' do
        sign_out
        do_request
        expect(response).to have_http_status(:unauthorized)
      end
    end

    context 'when theatre does not exist' do
      let(:theatre_id) { 999_999_999 }

      it 'returns 404' do
        sign_in_as(member)
        do_request
        expect(response).to have_http_status(:not_found)
      end
    end

    context 'when logged in but not host' do
      before do
        theatre.update!(host_user: other_user)
        sign_in_as(member)
      end

      it 'returns 403' do
        do_request
        expect(response).to have_http_status(:forbidden)
      end
    end

    context 'when current user is host' do
      before do
        theatre.update!(host_user: member)
        sign_in_as(member)
      end

      it 'sets current_post to an eligible post and updates current_post_started_at' do
        expect { do_request }
          .to change { theatre.reload.current_post_id }
          .from(nil).to(youtube_post.id)

        expect(response).to have_http_status(:no_content)
        expect(theatre.reload.current_post_started_at)
          .to be_within(1.second).of(Time.current)
      end
    end

    context 'when current user is host and no eligible post exists' do
      before do
        youtube_post.destroy!
        theatre.update!(
          host_user: member,
          current_post: other_post,
          current_post_started_at: 1.hour.ago
        )
        sign_in_as(member)
      end

      it 'still returns 204 and clears current_post' do
        do_request

        expect(response).to have_http_status(:no_content)

        theatre.reload
        expect(theatre.current_post_id).to be_nil
        expect(theatre.current_post_started_at)
          .to be_within(1.second).of(Time.current)
      end
    end
  end
end