@model (string templateId, string title)

<div id="template-editor-app" v-cloak>
    <div class="form-group">
        <h3 class="mt-5 mb-4">@Model.title </h3>
        @if (ViewContext.ViewData.ModelState.TryGetValue(Model.templateId, out var errors))
        {
            foreach (var error in errors.Errors)
            {
                <br/>
                <span class="text-danger">@error.ErrorMessage</span>
            }
        }

        <div class="bg-light card">
            <div class="card-body " v-bind:class="{ 'card-deck': items.length > 0}">
                <div v-for="(item, index) of items" class="card my-2 card-wrapper template-item me-0 ms-0" v-bind:key="item.id">
                    <div v-if="anyImages" class="card-img-top border-bottom" v-bind:style="getImage(item)"></div>
                    <div class="card-body">
                        <h6 class="card-title" v-html="item.title"></h6>
                        <button type="button" class="btn btn-primary" v-on:click="editItem(index)">Edit</button>
                        <button type="button" class="btn btn-danger" v-on:click="removeItem(index)">
                            <i class="fa fa-trash"></i>
                        </button>
                    </div>
                </div>
                <div v-if="!items || items.length === 0" class="col-12 text-center">
                    No items.<br/>
                    <button type="button" class="btn btn-link" v-on:click="editItem(-1)" id="btn-add-first">
                        Add your first item
                    </button>
                </div>
            </div>
            <div class="card-footer text-start p-3">
                <button type="button" class="btn btn-primary" v-on:click="editItem(-1)" id="btn-add">
                    <i class="fa fa-plus fa-fw"></i> Add
                </button>
                <button type="button" class="btn btn-secondary ms-2" v-on:click="toggleTemplateElement()" id="ToggleRawEditor">
                    Toggle raw editor
                </button>
            </div>
        </div>
        <div class="modal" id="product-modal" tabindex="-1" role="dialog">
            <div class="modal-dialog" role="document">
                <div class="modal-content">
                    <div class="modal-header">
                        <h5 class="modal-title" v-if="editingItem">{{editingItem.index>=0? "Edit" : "Create"}} item</h5>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close" ref="close">
                            <vc:icon symbol="close"/>
                        </button>
                    </div>
                    <div class="modal-body" v-if="editingItem">
                        <div class="mb-3">
                            <span class="text-danger row m-2" v-for="error of errors">{{error}}</span>
                            <div class="form-group row">
                                <div class="col-sm-6">
                                    <label class="form-label" data-required>Title</label>
                                    <input type="text" required pattern="[^\*#]+" class="form-control mb-2" v-model="editingItem.title" autofocus ref="txtTitle"/>
                                </div>
                                <div class="col-sm-3 px-0">
                                    <label class="form-label">Price</label>
                                    <select class="form-select" v-model="editingItem.custom">
                                        <option v-for="option in customPriceOptions" :value="option.value">{{option.text}}</option>
                                    </select>
                                </div>
                                <div class="col-sm-3" v-show="editingItem.custom !== 'topup'">
                                    
                                    <label class="form-label">&nbsp</label>
                                    <input class="form-control mb-2"
                                           inputmode="numeric"
                                           pattern="\d*"
                                           step="any"
                                           min="0"
                                           type="number"
                                           required
                                           v-model="editingItem.price" ref="txtPrice"/>
                                </div>

                            </div>
                            <div class="form-group">
                                <label class="form-label">Image</label>
                                <input type="text" class="form-control mb-2" pattern="[^\*#]+" v-model="editingItem.image" ref="txtImage"/>
                            </div>
                            <div class="form-group">
                                <label class="form-label">Description</label>
                                <textarea rows="3" cols="40" class="form-control mb-2" v-model="editingItem.description" ref="txtDescription"></textarea>
                            </div>
                            <div class="form-group">
                                <label class="form-label">Inventory (leave blank to not use inventory feature)</label>
                                <input type="number" min="0" step="1" class="form-control mb-2" v-model="editingItem.inventory" ref="txtInventory"/>
                            </div>
                            <div class="form-group">
                                <label class="form-label">Id (leave blank to generate from title)</label>
                                <input type="text" required pattern="[^\*#]+" class="form-control mb-2" v-model="editingItem.id" ref="txtId"/>
                            </div>
                            <div class="form-group">
                                <label class="form-label">Buy Button Text</label>
                                <input type="text" id="BuyButtonText" class="form-control mb-2" v-model="editingItem.buyButtonText" ref="txtBuyButtonText"/>
                            </div>
                            <div class="form-group d-flex align-items-center">
                                <input type="checkbox" id="Disabled" class="btcpay-toggle me-2" v-model="editingItem.disabled"/>
                                <label class="form-label mb-0">Disabled</label>
                            </div>
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal" v-on:click="clearEditingItem()">Close</button>
                        <button type="button" class="btn btn-primary" v-on:click="saveEditingItem()" id="SaveItemChanges">Save Changes</button>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
document.addEventListener("DOMContentLoaded", function () {
    new Vue({
        el: '#template-editor-app',
        data: {
            errors: [],
            items: [],
            editingItem: null,
            customPriceOptions: [
                { text: 'Fixed', value: "fixed" },
                { text: 'Minimum', value: "minimum" },
                { text: 'Custom', value: 'topup' },
            ],
            elementId: "@Model.templateId"
        },
        computed: {
            anyImages: function(){
                return !!this.items.find(function(i){ return !!i.image;});
            }
        },
        mounted: function() {
            this.loadYml();
            this.getInputElement().on("input change", this.loadYml.bind(this));            
            this.getModalElement().on("hide.bs.modal", this.clearEditingItem.bind(this));
            this.toggleTemplateElement();
        },
        methods: {
            toggleTemplateElement: function(){
                this.getInputElement().parent().toggle();
            },
            getImage: function(item){
                var image = this.unEscapeKey(item.image) || "~/img/img-placeholder.svg";
                var url = image.startsWith("~") ? image.replace('~', window.location.pathname.substring(0, image.indexOf('/apps'))) : image;
                return {
                    "background-image" : "url('" + url +"')",
                    "opacity": item.image? 1: 0.5
                }
            },
            getInputElement : function(){ return $("#" + this.elementId); },
            getModalElement : function(){ return $("#product-modal"); },
            loadYml: function(){
                var result = [];
                var template = this.getInputElement().val().trim();
                var lines = [];
                var items = template.split("\n");

                for (var i = 0; i < items.length; i++) {
                    if (items[i] === ""){
                        continue;
                    }
                    if (items[i].startsWith("  ")){
                        lines[lines.length-1]+=items[i] + "\n";
                    } else {
                        lines.push(items[i] + "\n");
                    }
                }

                // Split products from the template
                for (var kl in lines) {
                    var line = lines[kl], product = line.split("\n"), goingThroughMethods = false,
                        id = null, price = null, title = null, description = null, image = null,
                        custom = null, buyButtonText = null, inventory = null, paymentMethods = [],
                        disabled = false;

                    for (var kp in product) {
                        var productProperty = product[kp].trim();
            
                        if (kp == 0) {
                            id = productProperty.replace(":", "");
                        }
                        if (productProperty.startsWith("-") && goingThroughMethods) {
                            paymentMethods.push(productProperty.substr(1));
                        } else {
                            goingThroughMethods = false;
                        }
            
                        if (productProperty.indexOf('price:') !== -1) {
                            price = parseFloat(productProperty.replace('price:', '').trim()).noExponents();
                        }
                        if (productProperty.indexOf('title:') !== -1) {
                            title = productProperty.replace('title:', '').trim();
                        }
                        if (productProperty.indexOf('description:') !== -1) {
                            description =productProperty.replace('description:', '').trim();
                            if (description.startsWith('"') && description.endsWith('"')){
                                description = description.substr(1, description.length-2);
                            }
                            description = description
                            .replaceAll("<br>", "\n")
                            .replaceAll("<br/>", "\n")
                            .replaceAll('\\"', '"')
                        }
                        if (productProperty.indexOf('image:') !== -1) {
                            image = productProperty.replace('image:', '').trim();
                        }
                        if (productProperty.indexOf('price_type:') !== -1) {
                            custom = productProperty.replace('price_type:', '').trim();
                        }
                        if (productProperty.indexOf('buyButtonText:') !== -1) {
                            buyButtonText = productProperty.replace('buyButtonText:', '').trim();
                        }
                        if (productProperty.indexOf('inventory:') !== -1) {
                            inventory = parseInt(productProperty.replace('inventory:', '').trim(),10);
                        }
                        if (productProperty.indexOf('payment_methods:') !== -1) {
                            goingThroughMethods = true;
                        }
                        if (productProperty.indexOf('disabled:') !== -1) {
                            disabled = productProperty.replace('disabled:', '').trim() === "true";
                        }
                    }
            
                    if (title != null) {
                        // Add product to the list
                        result.push({
                            id: id,
                            title: title,
                            price: price,
                            image: image || null,
                            description:  description || '',
                            custom: custom || "fixed",
                            buyButtonText: buyButtonText,
                            inventory: isNaN(inventory)? null: inventory,
                            paymentMethods: paymentMethods,
                            disabled: disabled
                        });
                    }                    
                }
                this.items = result;
            },
            toYml: function(){
                    let template = '';
                    // Construct template from the product list
                    for (const key in this.items) {
                        const product = this.items[key],
                            id = product.id,
                            title = product.title,
                            price = product.custom === 'topup'? null : product.price??0,
                            image = product.image,
                            description = product.description,
                            custom = product.custom,
                            buyButtonText = product.buyButtonText,
                            inventory = product.inventory,
                            paymentMethods = product.paymentMethods,
                            disabled = product.disabled;
                        let itemTemplate = id+":\n";                        
                       itemTemplate += ( product.custom === 'topup'? '' : ('  price: ' + parseFloat(price).noExponents() + '\n'));
                        itemTemplate+= '  title: ' + title + '\n';

                        if (description) {
                            itemTemplate += '  description: "' + description.replaceAll("\n", "<br/>").replaceAll('"', '\\"') + '"\n';
                        }
                        if (image) {
                            itemTemplate += '  image: ' + image + '\n';
                        }
                        if (inventory) {
                            itemTemplate += '  inventory: ' + inventory + '\n';
                        }
                        if (custom != null) {
                            itemTemplate += '  price_type: "' + custom + '" \n';
                        }
                        if (buyButtonText != null && buyButtonText.length > 0) {
                            itemTemplate += '  buyButtonText: ' + buyButtonText + '\n';
                        }
                        if (disabled != null) {
                            itemTemplate += '  disabled: ' + disabled.toString() + '\n';
                        }
                        if(paymentMethods != null && paymentMethods.length > 0){
                            itemTemplate+= '  payment_methods:\n';
                            for (var method of paymentMethods){
                                itemTemplate+= '    - '+method+'\n';
                            }
                        }                       
                        itemTemplate += '\n';
                        template+=itemTemplate;
                    }
                    this.getInputElement().val(template);
            },
            editItem: function(index){
                this.errors = [];
                if(index < 0){
                    this.editingItem = {index:-1, id:"", title: "", price: 0, image: "", description: "", custom: "fixed", inventory: null, paymentMethods: [], disabled: false};
                }else{
                    this.editingItem = {...this.items[index], index};
                }
                
                this.editingItem = this.unEscape(this.editingItem);
                this.getModalElement().modal("show");
            },
            removeItem: function(index){
                this.items.splice(index,1);
                this.toYml();
            },
            clearEditingItem: function(){
                this.editingItem = null;
                this.errors = [];
            },
            validate: function(){
                this.errors = [];
                if (this.editingItem.id) {
                    var matchedId = this.items.findIndex((x)=> { return this.unEscapeKey(x.id) === this.editingItem.id;});
                    if( matchedId>= 0 && matchedId != this.editingItem.index)
                        this.errors.push("You cannot have multiple items with the same id");
                    
                    if (!this.$refs.txtId.checkValidity()) {
                        this.errors.push("Id is required and cannot have * or #");
                    }
                    if(this.editingItem.id.startsWith("- ")){
                        this.errors.push("Id cannot start with \"- \"");
                    }else if(this.editingItem.id.trim() == ""){
                        this.errors.push("Id is required");
                    }                   
                }   
                
                if (this.editingItem.description.indexOf("*") >= 0 || this.editingItem.description.indexOf("#") >= 0) {
                    this.errors.push("Description cannot have * or #");
                }
                if(this.editingItem.description.startsWith("- ")){
                    this.errors.push("Description cannot start with \"- \"");
                }
                if (!this.$refs.txtImage.checkValidity()) {
                    this.errors.push("Image cannot have * or #");
                }
                if(this.editingItem.image.startsWith("- ")){
                    this.errors.push("Image cannot start with \"- \"");
                }
                
                if (this.editingItem.custom !== "topup" && !this.$refs.txtPrice.checkValidity()) {
                    this.errors.push("Price must be a valid number");
                }
                if (!this.$refs.txtTitle.checkValidity()) {
                    this.errors.push("Title is required and cannot have * or #");
                }else if(this.editingItem.title.startsWith("- ")){
                    this.errors.push("Title cannot start with \"- \"");
                }else if(this.editingItem.title.trim() == ""){
                    this.errors.push("Title is required");
                }                
                if (!this.$refs.txtInventory.checkValidity()) {
                    this.errors.push("Inventory must be blank or a a valid number (>=0)");
                }
                return this.errors.length === 0;
            },
            saveEditingItem: function(){
                const fallbackId = this.editingItem.title.toLowerCase().trim();
                if(!this.editingItem.id && fallbackId){
                    this.editingItem.id = fallbackId;
                    this.$nextTick(this.saveEditingItem.bind(this));
                    return;
                }
                if(!this.validate()){
                    return;
                }
                this.editingItem = this.escape(this.editingItem);
                
                if(this.editingItem.index < 0){
                    this.items.push(this.editingItem);
                }else{
                    this.items.splice(this.editingItem.index,1,this.editingItem);
                }
                this.toYml();
                this.getModalElement().modal("hide");
            },
            escape: function(item) {
                for(var k in item){
                    if(k !== "paymentMethods" && k!=="id"){
                        item[k] = $('<div/>').text(item[k]).html();
                    }
                }
                return item;
            },
            unEscape: function(item){
                for(var k in item){
                    if(k !== "paymentMethods" && k!=="id" && k !== "disabled"){
                        item[k] = this.unEscapeKey(item[k]);
                    }
                }
                return item;
            },
            unEscapeKey : function(k){
                // Without this check a `false` boolean value will always be returned as an empty string
                if (k === false) {
                    return "false";
                }

                return $('<div/>').html(k).text();
            }
        }
    });
});

Number.prototype.noExponents= function(){
    var data= String(this).split(/[eE]/);
    if(data.length== 1) return data[0];

    var  z= '', sign= this<0? '-':'',
        str= data[0].replace('.', ''),
        mag= Number(data[1])+ 1;

    if(mag<0){
        z= sign + '0.';
        while(mag++) z += '0';
        return z + str.replace(/^\-/,'');
    }
    mag -= str.length;
    while(mag--) z += '0';
    return str + z;
};

</script>