# frozen_string_literal: true

require 'spec_helper'

class FlowMap
  include Stealth::Flow

  flow :new_todo do
    state :new
    state :get_due_date
    state :created, fails_to: :new
    state :error
  end

  flow :marco do
    state :polo
  end
end

describe "Stealth::Session" do
  let(:id) { '0xDEADBEEF' }

  it "should raise an error if $redis is not set" do
    $redis = nil

    expect {
      Stealth::Session.new(id: id)
    }.to raise_error(Stealth::Errors::RedisNotConfigured)

    $redis = MockRedis.new
  end

  describe "without a session" do
    let(:session) { Stealth::Session.new(id: id) }

    it "should have nil flow and state" do
      expect(session.flow).to be_nil
      expect(session.state).to be_nil
    end

    it "should have nil flow_string and state_string" do
      expect(session.flow_string).to be_nil
      expect(session.state_string).to be_nil
    end

    it "should respond to present? and blank?" do
      expect(session.present?).to be false
      expect(session.blank?).to be true
    end
  end

  describe "with a session" do
    let(:session) do
      session = Stealth::Session.new(id: id)
      session.set_session(new_flow: 'marco', new_state: 'polo')
      session
    end

    it "should return the FlowMap" do
      expect(session.flow).to be_a(FlowMap)
    end

    it "should return the state" do
      expect(session.state).to be_a(Stealth::Flow::State)
      expect(session.state).to eq :polo
    end

    it "should return the flow_string" do
      expect(session.flow_string).to eq "marco"
    end

    it "should return the state_string" do
      expect(session.state_string).to eq "polo"
    end

    it "should respond to present? and blank?" do
      expect(session.present?).to be true
      expect(session.blank?).to be false
    end
  end

  describe "incrementing and decrementing" do
    let(:session) { Stealth::Session.new(id: id) }

    it "should increment the state" do
      session.set_session(new_flow: 'new_todo', new_state: 'get_due_date')
      new_session = session + 1.state
      expect(new_session.state_string).to eq('created')
    end

    it "should decrement the state" do
      session.set_session(new_flow: 'new_todo', new_state: 'error')
      new_session = session - 2.states
      expect(new_session.state_string).to eq('get_due_date')
    end

    it "should return the first state if the decrement is out of bounds" do
      session.set_session(new_flow: 'new_todo', new_state: 'get_due_date')
      new_session = session - 5.states
      expect(new_session.state_string).to eq('new')
    end

    it "should return the last state if the increment is out of bounds" do
      session.set_session(new_flow: 'new_todo', new_state: 'created')
      new_session = session + 5.states
      expect(new_session.state_string).to eq('error')
    end
  end

  describe "==" do
    let(:session) {
      _session = Stealth::Session.new(id: id, type: :primary)
      _session.set_session(new_flow: 'hello', new_state: 'say_hola')
      _session
    }

    it "should return false if the session ids do not" do
      other_session = Stealth::Session.new(id: 'xyz123', type: :primary)
      other_session.set_session(new_flow: 'hello', new_state: 'say_hola')
      expect(session == other_session).to be false
    end

    it "should return false if the states do not" do
      other_session = Stealth::Session.new(id: id, type: :primary)
      other_session.set_session(new_flow: 'hello', new_state: 'say_hola2')
      expect(session == other_session).to be false
    end

    it "should return false if flows do not match" do
      other_session = Stealth::Session.new(id: id, type: :primary)
      other_session.set_session(new_flow: 'hello2', new_state: 'say_hola')
      expect(session == other_session).to be false
    end

    it 'should return false if the session type does not match' do
      other_session = Stealth::Session.new(id: id, type: :back_to)
      other_session.set_session(new_flow: 'hello', new_state: 'say_hola')
      expect(session == other_session).to be false
    end

    it 'should return true if the session id, flow, state, and session types match' do
      other_session = Stealth::Session.new(id: id, type: :primary)
      other_session.set_session(new_flow: 'hello', new_state: 'say_hola')
      expect(session == other_session).to be true
    end
  end

  describe "self.is_a_session_string?" do
    it "should return false for state strings" do
      session_string = 'say_hello'
      expect(Stealth::Session.is_a_session_string?(session_string)).to be false
    end

    it "should return false for an incomplete session string" do
      session_string = 'hello->'
      expect(Stealth::Session.is_a_session_string?(session_string)).to be false
    end

    it "should return true for a complete session string" do
      session_string = 'hello->say_hello'
      expect(Stealth::Session.is_a_session_string?(session_string)).to be true
    end
  end

  describe "self.canonical_session_slug" do
    it "should generate a canonical session slug given a flow and state as symbols" do
      expect(
        Stealth::Session.canonical_session_slug(flow: :hello, state: :say_hello)
      ).to eq 'hello->say_hello'
    end

    it "should generate a canonical session slug given a flow and state as strings" do
      expect(
        Stealth::Session.canonical_session_slug(flow: 'hello', state: 'say_hello')
      ).to eq 'hello->say_hello'
    end
  end

  describe "self.flow_and_state_from_session_slug" do
    it "should return the flow and string as a hash with symbolized keys" do
      slug = 'hello->say_hello'
      expect(
        Stealth::Session.flow_and_state_from_session_slug(slug: slug)
      ).to eq({ flow: 'hello', state: 'say_hello' })
    end

    it "should not raise if slug is nil" do
      slug = nil
      expect(
        Stealth::Session.flow_and_state_from_session_slug(slug: slug)
      ).to eq({ flow: nil, state: nil })
    end
  end

  describe "setting sessions" do
    let(:session) { Stealth::Session.new(id: id) }
    let(:previous_session) { Stealth::Session.new(id: id, type: :previous) }
    let(:back_to_session) { Stealth::Session.new(id: id, type: :back_to) }

    before(:each) do
      $redis.del(id)
      $redis.del([id, 'previous'].join('-'))
      $redis.del([id, 'back_to'].join('-'))
    end

    it "should store the new session" do
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.get(id)).to eq 'marco->polo'
    end

    it "should store the current_session to previous_session" do
      $redis.set(id, 'new_todo->new')
      $redis.set([id, 'previous'].join('-'), 'new_todo->error')
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect(previous_session.get_session).to eq 'new_todo->new'
    end

    it "should not update previous_session if it matches current_session" do
      $redis.set(id, 'marco->polo')
      $redis.set([id, 'previous'].join('-'), 'new_todo->new')
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect(previous_session.get_session).to eq 'new_todo->new'
    end

    it "should set an expiration for current_session if session_ttl is specified" do
      Stealth.config.session_ttl = 500
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.ttl(id)).to be > 0
      Stealth.config.session_ttl = 0
    end

    it "should set an expiration for previous_session if session_ttl is specified" do
      Stealth.config.session_ttl = 500
      $redis.set(id, 'new_todo->new')
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.ttl([id, 'previous'].join('-'))).to be > 0
      Stealth.config.session_ttl = 0
    end

    it "should NOT set an expiration if session_ttl is not specified" do
      Stealth.config.session_ttl = 0
      session.set_session(new_flow: 'new_todo', new_state: 'get_due_date')
      expect($redis.ttl(id)).to eq -1 # Does not expire
    end

    it "should set the session for back_to" do
      back_to_session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.get([id, 'back_to'].join('-'))).to eq 'marco->polo'
    end

    it "should set an expiration for back_to if session_ttl is specified" do
      Stealth.config.session_ttl = 500
      back_to_session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.ttl([id, 'back_to'].join('-'))).to be > 0
      Stealth.config.session_ttl = 0
    end
  end

  describe "getting sessions" do
    let(:session) { Stealth::Session.new(id: id) }
    let(:previous_session) { Stealth::Session.new(id: id, type: :previous) }
    let(:back_to_session) { Stealth::Session.new(id: id, type: :back_to) }

    before(:each) do
      $redis.del(id)
      $redis.del([id, 'previous'].join('-'))
      $redis.del([id, 'back_to'].join('-'))
    end

    it "should return the stored current_session" do
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect(session.get_session).to eq 'marco->polo'
    end

    it "should return the stored previous_session if previous is requested" do
      $redis.set(id, 'new_todo->new')
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect(previous_session.get_session).to eq 'new_todo->new'
    end

    it "should update the expiration of current_session if session_ttl is set" do
      Stealth.config.session_ttl = 50
      session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.ttl(id)).to be_between(0, 50).inclusive

      Stealth.config.session_ttl = 500
      session.session = nil # reset memoization
      session.get_session
      expect($redis.ttl(id)).to be > 100

      Stealth.config.session_ttl = 0
    end

    it "should return the stored back_to_session" do
      back_to_session.set_session(new_flow: 'marco', new_state: 'polo')
      expect(back_to_session.get_session).to eq 'marco->polo'
    end

    it "should update the expiration of back_to_session if session_ttl is set" do
      Stealth.config.session_ttl = 50
      back_to_session.set_session(new_flow: 'marco', new_state: 'polo')
      expect($redis.ttl([id, 'back_to'].join('-'))).to be_between(0, 50).inclusive

      Stealth.config.session_ttl = 500
      back_to_session.session = nil # reset memoization
      back_to_session.get_session
      expect($redis.ttl([id, 'back_to'].join('-'))).to be > 100

      Stealth.config.session_ttl = 0
    end
  end

  describe "clearing sessions" do
    let(:session) { Stealth::Session.new(id: id) }
    let(:previous_session) { Stealth::Session.new(id: id, type: :previous) }
    let(:back_to_session) { Stealth::Session.new(id: id, type: :back_to) }

    before(:each) do
      session.send(:persist_key, key: session.session_key, value: '1')
      previous_session.send(:persist_key, key: previous_session.session_key, value: '1')
      back_to_session.send(:persist_key, key: back_to_session.session_key, value: '1')
    end

    it "should remove a default session from Redis" do
      expect($redis.get(session.session_key)).to eq '1'
      session.clear_session
      expect($redis.get(session.session_key)).to be_nil
    end

    it "should remove a previous session from Redis" do
      expect($redis.get(previous_session.session_key)).to eq '1'
      previous_session.clear_session
      expect($redis.get(previous_session.session_key)).to be_nil
    end

    it "should remove a back_to session from Redis" do
      expect($redis.get(back_to_session.session_key)).to eq '1'
      back_to_session.clear_session
      expect($redis.get(back_to_session.session_key)).to be_nil
    end
  end

  describe "self.slugify" do
    it "should return a session slug given a flow and state" do
      expect(Stealth::Session.slugify(flow: 'hello', state: 'world')).to eq 'hello->world'
    end

    it "should raise an ArgumentError if flow is blank" do
      expect {
        Stealth::Session.slugify(flow: '', state: 'world')
      }.to raise_error(ArgumentError)
    end

    it "should raise an ArgumentError if state is blank" do
      expect {
        Stealth::Session.slugify(flow: 'hello', state: nil)
      }.to raise_error(ArgumentError)
    end

    it "should raise an ArgumentError if flow and state are blank" do
      expect {
        Stealth::Session.slugify(flow: nil, state: nil)
      }.to raise_error(ArgumentError)
    end
  end
end