Created
January 8, 2020 13:29
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| const CART_EVENT = { | |
| ADD: "ADD", | |
| REMOVE: "REMOVE", | |
| UPDATE_QTY: "UPDATE_QTY", | |
| SAVE_FOR_LATER: "SAVE_FOR_LATER" | |
| }; | |
| const SAVE_FOR_LATER_EVENT = { | |
| ADD_TO_LIST: "ADD_TO_LIST", | |
| UNSAVE: "UNSAVE", | |
| MOVE_TO_CART: "MOVE_TO_CART" | |
| }; | |
| const addProduct = assign((ctx, evt) => { | |
| const matches = ctx.cart.products.filter(i => i.id === evt.payload.id); | |
| if (matches.length > 0) { | |
| return { | |
| cart: { | |
| ...ctx.cart, | |
| products: ctx.cart.products.map(p => { | |
| if (p.id === evt.payload.id) { | |
| return { | |
| ...p, | |
| qty: p.qty + 1 | |
| }; | |
| } | |
| return p; | |
| }) | |
| } | |
| }; | |
| } else { | |
| return { | |
| cart: { | |
| ...ctx.cart, | |
| products: [...ctx.cart.products, evt.payload] | |
| } | |
| }; | |
| } | |
| }); | |
| const computeCartTotal = assign((ctx, evt) => { | |
| const sumAllProductsQty = (acc, val) => acc + val.qty; | |
| return { | |
| cart: { | |
| ...ctx.cart, | |
| count: ctx.cart.products.reduce(sumAllProductsQty, 0) | |
| } | |
| }; | |
| }); | |
| const removeProduct = assign((ctx, evt) => ({ | |
| cart: { | |
| ...ctx.cart, | |
| products: ctx.cart.products.filter(p => { | |
| if (p.id === evt.payload.id) { | |
| return false; | |
| } | |
| return true; | |
| }) | |
| } | |
| })); | |
| const updateProduct = assign((ctx, evt) => ({ | |
| cart: { | |
| ...ctx.cart, | |
| products: ctx.cart.products.map(p => { | |
| if (p.id === evt.payload.id) { | |
| return { | |
| ...p, | |
| ...evt.payload | |
| }; | |
| } | |
| return p; | |
| }) | |
| } | |
| })); | |
| const saveForLater = send((context, event) => ({ | |
| type: SAVE_FOR_LATER_EVENT.ADD_TO_LIST, | |
| payload: event.payload | |
| })); | |
| const cartActions = { | |
| addProduct, | |
| computeCartTotal, | |
| removeProduct, | |
| updateProduct, | |
| saveForLater | |
| }; | |
| const addSaveForLater = assign((ctx, evt) => { | |
| const matches = ctx.savedForLater.products.filter( | |
| i => i.id === evt.payload.id | |
| ); | |
| if (matches.length > 0) return ctx.savedForLater; | |
| return { | |
| savedForLater: { | |
| ...ctx.savedForLater, | |
| products: [...ctx.savedForLater.products, evt.payload] | |
| } | |
| }; | |
| }); | |
| const unsaveProduct = assign((ctx, evt) => ({ | |
| savedForLater: { | |
| ...ctx.savedForLater, | |
| products: ctx.savedForLater.products.filter(p => { | |
| if (p.id === evt.payload.id) { | |
| return false; | |
| } | |
| return true; | |
| }) | |
| } | |
| })); | |
| const moveToCart = send((context, event) => ({ | |
| type: CART_EVENT.ADD, | |
| payload: event.payload | |
| })); | |
| const saveForLaterActions = { | |
| addSaveForLater, | |
| unsaveProduct, | |
| moveToCart | |
| }; | |
| const guards = { | |
| isCartEmpty: (ctx, evt) => ctx.cart.products.length < 1, | |
| isSavedEmpty: (ctx, evt) => ctx.savedForLater.products.length < 1, | |
| isProduct: (ctx, evt) => { | |
| const p = evt.payload; | |
| return p && p.id && p.id.length > 0; // add more validations | |
| } | |
| }; | |
| const cartMachine = Machine( | |
| { | |
| id: "cartMachine", | |
| initial: "empty", | |
| context: { | |
| cart: { | |
| count: 0, | |
| products: [], | |
| subtotal: 0, | |
| delivery: 0, | |
| estimatedTaxesAndFees: 0, | |
| estimatedTotal: 0, | |
| error: undefined | |
| }, | |
| savedForLater: { | |
| products: [] | |
| } | |
| }, | |
| type: "parallel", | |
| states: { | |
| cart: { | |
| id: "cart", | |
| initial: "empty", | |
| states: { | |
| empty: { | |
| on: { | |
| [CART_EVENT.ADD]: { | |
| target: "unpaid", | |
| actions: ["addProduct", "computeCartTotal"], | |
| cond: "isProduct" | |
| } | |
| } | |
| }, | |
| unpaid: { | |
| initial: "normal", | |
| on: { | |
| "": { | |
| target: "empty", | |
| cond: "isCartEmpty" | |
| }, | |
| [CART_EVENT.SAVE_FOR_LATER]: { | |
| actions: ["saveForLater", "removeProduct", "computeCartTotal"] | |
| }, | |
| [CART_EVENT.REMOVE]: { | |
| target: ".normal", | |
| actions: ["removeProduct", "computeCartTotal"], | |
| cond: "isProduct" | |
| }, | |
| [CART_EVENT.ADD]: { | |
| target: ".normal", | |
| actions: ["addProduct", "computeCartTotal"], | |
| cond: "isProduct" | |
| }, | |
| [CART_EVENT.UPDATE_QTY]: { | |
| target: ".normal", | |
| actions: ["updateProduct", "computeCartTotal"], | |
| cond: "isProduct" | |
| }, | |
| UPDATE_PRICE: { | |
| target: ".normal", | |
| actions: "updateProduct", | |
| cond: "isProduct" | |
| }, | |
| PAY: "paying" | |
| }, | |
| states: { | |
| error: {}, | |
| normal: {} | |
| } | |
| }, | |
| paying: { | |
| on: { | |
| RESOLVE: "paid", | |
| REJECT: "unpaid.error" | |
| } | |
| }, | |
| paid: { | |
| after: { | |
| 1000: "empty" | |
| } | |
| } | |
| } | |
| }, | |
| savedForLater: { | |
| id: "savedForLater", | |
| initial: "empty", | |
| on: { | |
| [SAVE_FOR_LATER_EVENT.ADD_TO_LIST]: { | |
| target: ".saved", | |
| actions: ["addSaveForLater"] | |
| } | |
| }, | |
| states: { | |
| empty: {}, | |
| saved: { | |
| on: { | |
| "": { | |
| target: "empty", | |
| cond: "isSavedEmpty" | |
| }, | |
| [SAVE_FOR_LATER_EVENT.UNSAVE]: { | |
| actions: ["unsaveProduct"] | |
| }, | |
| [SAVE_FOR_LATER_EVENT.MOVE_TO_CART]: { | |
| actions: ["moveToCart", "unsaveProduct"] | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| }, | |
| { | |
| actions: { | |
| ...cartActions, | |
| ...saveForLaterActions | |
| }, | |
| guards | |
| } | |
| ); |
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