Generated by XState Viz: https://xstate.js.org/viz

machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const buyMachine = Machine({
    id: 'buy',
    initial: 'outside',
    context: {
      loggedIn: false,
      subscription: null,
      bookId: null,
      initialLocation: null,
      alreadySubscribedChosen: false
    },
    states: {
      outside: {
        on: {
          CLICK_PROTECTED: [
            {
            target: 'bookView',
            cond: 'subscribed'
          },
            {
            target: 'paywall'
          }]
        }
      },
      bookView: {
        type: 'final'
      },
      paywall: {
        always: [{
          target: 'bookView',
          cond: 'subscribed'
        }],
        on: {
          SUBSCRIBE: {
            target: 'authenticating',
          },
          ALREADY_SUBSCRIBED: {
            target: 'authenticating',
            action: assign({
              alreadySubscribedChosen: true
            }),
          },
          CLOSE: {
            target: 'outside',
            actions: 'redirectToInitial'
          }
        }
      },
      authenticating: {
        always: [{
          target: 'bookView',
          cond: 'loggedIn'
        }],
        invoke: {
          id: "authenticateUser",
          src: "authenticateUser",
          onDone: {
            target: "hasSubscription",
          },
          onError: {
            target: "paymentFailure"
          }
        }
      },
      hasSubscription: {
        always: [{
          target: 'bookView',
          cond: 'subscribed'
        },
        {
          target: 'noSubscription',
          cond: 'alreadySubscribedChosen'
        },
        {
          target: 'payment'
        }],
      },
      noSubscription: {
        on: {
          SUBSCRIBE: 'payment',
          CLOSE: {
            target: 'outside',
            actions: 'redirectToInitial'
          }
        }
      },
      payment: {
        always: [{
          target: 'bookView',
          cond: 'loggedIn'
        }],
        invoke: {
          id: "pay",
          src: "pay",
          onDone: {
            target: "paymentSuccess",
          },
          onError: {
            target: "paymentFailure"
          }
        }
      },
      paymentSuccess: {
        on: {
          OK: {
            target: 'bookView'
          }
        }
      },
      paymentFailure: {
        on: {
          RETRY: {
            target: 'payment'
          }
        }
      }
    }
  }, {
    guards: {
      subscribed: (c, e) => Boolean(c.subscription),
      alreadySubscribedChosen: (c, e) => Boolean(c.alreadySubscribedChosen)
    }
  });