let items = []; //the ingredients to be displayed
let tbody = document.querySelector("tbody");
let currentSort = "";

//Remove any existing ingredients in table
//loop through items and create rows for the table
let renderIngredients = ()=>{
    while(tbody.hasChildNodes()){
        tbody.removeChild(tbody.firstChild);
    }

    for(let item of items){
        let row = document.createElement("tr");
        tbody.appendChild(row);

        let name = document.createElement("td");
        name.innerText = item.name;
        row.appendChild(name);

        let category = document.createElement("td");
        category.innerText = item.category;
        row.appendChild(category);

        let quantity = document.createElement("td");
        quantity.innerText = item.quantity;
        row.appendChild(quantity);

        let unit = document.createElement("td");
        unit.innerText = item.unit;
        row.appendChild(unit);

        let action = document.createElement("td");
        row.appendChild(action);

        let editBtn = document.createElement("button");
        editBtn.onclick = ()=>{editIngredient(item.id, row)};
        editBtn.innerText = "Edit";
        editBtn.className = "edit-button"
        action.appendChild(editBtn);

        let removeBtn = document.createElement("button");
        removeBtn.onclick = ()=>{removeIngredient(item.id, row)};
        removeBtn.innerText = "Remove";
        removeBtn.className = "edit-button";
        action.appendChild(removeBtn);
    }
}

//sorts items by specified property
let sortIngredients = (property)=>{
    if(currentSort === property){
        items.sort((a, b) => (a[property] > b[property]) ? -1 : 1);
        currentSort = "";
    }else{
        items.sort((a, b) => (a[property] > b[property]) ? 1 : -1);
        currentSort = property;
    }
    renderIngredients();
}

//Empty items list
//Add ingredients back to items list based on filter input
let filter = ()=>{
    items = [];
    let searchString = document.querySelector("#filter").value.toLowerCase();
    for(let item of merchant.inventory){
        if(item.ingredient.name.toLowerCase().includes(searchString)){
            items.push({
                id: item._id,
                name: item.ingredient.name,
                category: item.ingredient.category,
                quantity: item.quantity,
                unit: item.ingredient.unit
            });
        }
    }

    sortIngredients("name");
    renderIngredients(items);
}

//Create input allowing for user edit of ingredient
let editIngredient = (id, row)=>{
    let quantity = row.children[2];
    let button = row.children[4].children[0];
    let originalQuantity = quantity.innerText;

    let quantityInput = document.createElement("input");
    quantityInput.type = "number";
    quantityInput.step = "0.01";
    quantityInput.value = quantity.innerText;

    quantity.innerText = "";
    quantity.appendChild(quantityInput);

    button.innerText = "Save";
    button.onclick = ()=>{updateOne(id, row, originalQuantity)};
}

//Save user input of ingredient
//Update both page and database
let updateOne = (id, row, originalQuantity)=>{
    let quantityField = row.children[2];
    let quantity = quantityField.children[0].value;
    let button = row.children[4].children[0];

    quantityField.removeChild(quantityField.firstChild);

    if(validator.ingredient.quantity(quantity)){
        let updateIngredient = merchant.inventory.find(i => i._id === id);
        updateIngredient.quantity = quantity;
        axios.post("merchant/update", merchant)
            .then((merchant)=>{
                banner.createNotification("The ingredient has been successfully updated");
            })
            .catch((err)=>{
                banner.createError("There was an error and the ingredient was not updated");
                console.log(err);
            });

        quantityField.innerText = quantity;
    }else{
        quantityField.innerText = originalQuantity;
    }

    button.innerText = "Edit";
    button.onclick = ()=>{editIngredient(id, row)};
}

//Delete an ingredient from both the page and the database
let removeIngredient = (id, row)=>{
    for(let i = 0; i < merchant.inventory.length; i++){
        if(merchant.inventory[i]._id === id){
            merchant.inventory.splice(i, 1);
            break;
        }
    }

    axios.post("/merchant/update", merchant)
        .then((merchant)=>{
            for(let i = 0; i < items.length; i++){
                if(id === items[i].id){
                    items.splice(i, 1);
                }
            }
            banner.createNotification("The ingredient has been removed from your inventory");
            renderIngredients();
        })
        .catch((err)=>{
            banner.createError("There was an error and the ingredient has not been removed from your inventory");
            console.log(err);
        });
}

//Display the modal to allow for adding a new ingredient
let displayAdd = ()=>{
    document.querySelector("#existingIngredient").style.display = "block";
    document.querySelector("#quantityInput").style.display = "none";
    document.querySelector("#newIngredient").style.display = "none";
    document.querySelector("#createNew").onclick = ()=>{displayNew();};

    let modal = document.querySelector(".add-ingredient");

    let removeModal = (modal)=>{modal.style.visibility = "hidden";}

    modal.onclick = ()=>{removeModal(modal);};

    modal.style.visibility = "visible";

    axios.get("/ingredients")
        .then((ingredients)=>{
            let tbody = document.querySelector("#existingIngredient table tbody");

            while(tbody.children.length > 0){
                tbody.removeChild(tbody.firstChild);
            }

            for(let ingredient of ingredients.data){
                let row = document.createElement("tr");
                tbody.appendChild(row);

                let name = document.createElement("td");
                name.innerText = ingredient.name;
                row.appendChild(name);

                let category = document.createElement("td");
                category.innerText = ingredient.category;
                row.appendChild(category);

                let unit = document.createElement("td");
                unit.innerText = ingredient.unit;
                row.appendChild(unit);

                let addButton = document.createElement("button");
                addButton.innerText = "Add";
                addButton.onclick = ()=>{configureAddIngredient(ingredient);};
                row.appendChild(addButton);
            }
        })
        .catch((err)=>{
            banner.createError("Failed to retrieve ingredients list");
        });
}

let configureAddIngredient = (ingredient)=>{
    document.querySelector("#existingIngredient").style.display = "none";
    document.querySelector("#quantityInput").style.display = "block";
    document.querySelector("#newIngredient").style.display = "none";
    
    document.querySelector("#quantityInputTitle").innerText = `${ingredient.name} (${ingredient.unit})`;

    let button = document.querySelector("#addIngredient");
    let input = document.querySelector("#quantityInput input");

    button.onclick = ()=>{addIngredient({ingredient: ingredient, quantity: input.value});};
}

let displayNew = ()=>{
    document.querySelector("#existingIngredient").style.display = "none";
    document.querySelector("#quantityInput").style.display = "none";
    document.querySelector("#newIngredient").style.display = "block";
    document.querySelector("#createIngredient").onclick = ()=>{createIngredient();};
}

let createIngredient = ()=>{
    let newItem = {
        ingredient: {
            name: document.querySelector("#newName").value,
            category: document.querySelector("#newCategory").value,
            unit: document.querySelector("#newUnit").value
        },
        quantity: document.querySelector("#newQuantity").value
    }

    addIngredient(newItem);
}

//Update new ingredient on both the page and the database
//Close the modal
let addIngredient = (item)=>{
    if(validator.ingredient.all(item.ingredient, item.quantity)){
        merchant.inventory.push(item);
        if(item.ingredient._id){
            axios.post("/merchant/ingredients/create", item)
                .then((newMerchant)=>{
                    filter();
                    banner.createNotification("The new ingredient has been successfully added to your inventory");
                })
                .catch((err)=>{
                    banner.createError("There was an error and the ingredient could not be added to your inventory");
                    console.log(err);
                });
        }else{
            axios.post("/ingredients/createone", item)
                .then((newMerchant)=>{
                    filter();
                    banner.createNotification("The new ingredient has been successfully added to your inventory");
                })
                .catch((err)=>{
                    console.log(err);
                    banner.createError("There was an error and the ingredient could not be added to your inventory");
                });
        }
    }

    let modal = document.querySelector(".add-ingredient");
    modal.style.visibility = "hidden";
}

//Initial run 
filter();