subline/views/dashboardPage/home.js

window.homeStrandObj = {
    isPopulated: false,
    graph: {},

    display: function(){
        if(!this.isPopulated){
            let today = new Date();
            let firstOfMonth = new Date(today.getFullYear(), today.getMonth(), 1);
            let firstOfLastMonth = new Date(today.getFullYear(), today.getMonth() - 1, 1);
            let lastMonthtoDay = new Date(new Date().setMonth(today.getMonth() - 1));

            let revenueThisMonth = this.calculateRevenue(dateIndices(firstOfMonth));
            let revenueLastmonthToDay = this.calculateRevenue(dateIndices(firstOfLastMonth, lastMonthtoDay));

            document.querySelector("#revenue").innerText = `$${revenueThisMonth.toLocaleString("en")}`;

            let revenueChange = ((revenueThisMonth - revenueLastmonthToDay) / revenueLastmonthToDay) * 100;
            
            let img = "";
            if(revenueChange >= 0){
                img = "/shared/images/upArrow.png";
            }else{
                img = "/shared/images/downArrow.png";
            }
            document.querySelector("#revenueChange p").innerText = `${Math.abs(revenueChange).toFixed(2)}% vs last month`;
            document.querySelector("#revenueChange img").src = img;

            this.graph = new LineGraph(
                document.querySelector("#graphCanvas"),
                "$",
                "Date"
            )

            let thirtyAgo = new Date(today);
            thirtyAgo.setDate(today.getDate() - 29);

            this.graph.addData(
                this.graphData(dateIndices(thirtyAgo)),
                [thirtyAgo, new Date()],
                "Revenue"
            );

            //Inventory Check
            let rands = [];
            for(let i = 0; i < 5; i++){
                let rand = Math.floor(Math.random() * merchant.inventory.length);

                if(rands.includes(rand)){
                    i--;
                }else{
                    rands[i] = rand;
                }
            }

            let ul = document.querySelector("#inventoryCheckCard ul");
            for(let rand of rands){
                let li = document.createElement("li");
                li.classList = "flexRow";
                li.ingredientIndex = rand;
                ul.appendChild(li);

                let name = document.createElement("p");
                name.innerText = merchant.inventory[rand].ingredient.name;
                li.appendChild(name);

                let input = document.createElement("input");
                input.type = "number";
                input.value = merchant.inventory[rand].quantity;
                li.appendChild(input);

                let label = document.createElement("p");
                label.innerText = merchant.inventory[rand].ingredient.unit;
                li.appendChild(label);
            }

            this.isPopulated = true;
        }
    },

    calculateRevenue: function(indices){
        let total = 0;

        for(let i = indices[0]; i <= indices[1]; i++){
            for(let recipe of transactions[i].recipes){
                for(let merchRecipe of merchant.recipes){
                    if(recipe.recipe === merchRecipe._id){
                        total += recipe.quantity * merchRecipe.price;
                    }
                }
            }
        }

        return total / 100;
    },

    graphData: function(indices){
        let dataList = new Array(30).fill(0);
        let currentDate = transactions[indices[0]].date;
        let arrayIndex = 0;

        for(let i = indices[0]; i <= indices[1]; i++){
            if(transactions[i].date.getDate() !== currentDate.getDate()){
                currentDate = transactions[i].date;
                arrayIndex++;
            }
            for(let recipe of transactions[i].recipes){
                for(let merchRecipe of merchant.recipes){
                    if(recipe.recipe === merchRecipe._id){
                        dataList[arrayIndex] = parseFloat((dataList[arrayIndex] + (recipe.quantity * merchRecipe.price) / 100).toFixed(2));
                        break;
                    }
                }
            }
        }

        return dataList;
    },

    updateInventory: function(){
        let lis = document.querySelectorAll("#inventoryCheckCard ul li");

        let changes = [];

        for(let li of lis){
            if(li.children[1].value >= 0){
                let merchIngredient = merchant.inventory[li.ingredientIndex];

                let change = li.children[1].value - merchIngredient.quantity;

                if(change !== 0){
                    changes.push({
                        id: merchIngredient.ingredient._id,
                        quantityChange: change
                    });


                }
            }else{
                banner.createError("Cannot have negative ingredients");
                return;
            }
        }
        
        if(changes.length > 0){
            fetch("/merchant/ingredients/update", {
                method: "POST",
                headers: {
                    "Content-Type": "application/json;charset=utf-8"
                },
                body: JSON.stringify(changes)
            })
                .then((response)=>{
                    banner.createError("Ingredients updated");
                    
                    if(typeof(response.data) === "string"){
                        console.log(err);
                    }else{
                        for(let change of changes){
                            merchant.inventory.find((item)=> item.ingredient._id === change.id).quantity += change.quantityChange;
                        }
                    }
                })
                .catch((err)=>{
                    console.log(err);
                });

            
        }
    }
}