{% extends 'base.html' %}
{% load crispy_forms_tags %}

{% block title %}{{ title }}{% endblock %}

{% block content %}
<div class="d-flex justify-content-between align-items-center mb-4">
    <h1 class="h3 mb-0">
        <i class="bi bi-list-check me-2"></i>
        {{ title }}
    </h1>
    <a href="{% url 'manufacture:bom_list' %}" class="btn btn-outline-secondary">
        <i class="bi bi-arrow-left me-2"></i>
        Back to BOM List
    </a>
</div>

<div class="row">
    <div class="col-md-8">
        <div class="card">
            <div class="card-header">
                <h5 class="card-title mb-0">Bill of Materials Information</h5>
            </div>
            <div class="card-body">
                <form method="post" id="bom-form">
                    {% csrf_token %}
                    
                    {# Use dynamic form for both creation and editing #}
                    <div class="row">
                        <div class="col-md-12">
                            {% if main_form %}
                                {{ main_form.manufactured_product|as_crispy_field }}
                            {% else %}
                                {{ form.manufactured_product|as_crispy_field }}
                            {% endif %}
                        </div>
                    </div>
                    
                    <h5 class="mt-4 mb-3">Components</h5>
                    {% if component_formset %}
                        {{ component_formset.management_form }}
                        
                        <div id="component-forms-container">
                            {% for component_form in component_formset %}
                                <div class="card mb-3 component-form">
                                    <div class="card-header d-flex justify-content-between align-items-center">
                                        <h6 class="card-title mb-0">Component #{{ forloop.counter }}</h6>
                                        {% if forloop.counter > 1 %}
                                            <button type="button" class="btn btn-sm btn-outline-danger remove-component">
                                                <i class="bi bi-trash"></i> Remove
                                            </button>
                                        {% endif %}
                                    </div>
                                    <div class="card-body">
                                        <div class="row">
                                            <div class="col-md-6">
                                                {{ component_form.component|as_crispy_field }}
                                            </div>
                                            <div class="col-md-6">
                                                {{ component_form.quantity|as_crispy_field }}
                                            </div>
                                        <div class="row">
                                            <div class="col-md-6">
                                                {{ component_form.unit|as_crispy_field }}
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            {% endfor %}
                        </div>
                        
                        <div class="mb-3">
                            <button type="button" id="add-component" class="btn btn-outline-primary">
                                <i class="bi bi-plus-circle me-2"></i>
                                Add Another Component
                            </button>
                        </div>
                    {% else %}
                        {# Single BOM form for backward compatibility #}
                        <div class="row">
                            <div class="col-md-6">
                                {{ form.component|as_crispy_field }}
                            </div>
                            <div class="col-md-6">
                                {{ form.quantity|as_crispy_field }}
                            </div>
                        <div class="row">
                            <div class="col-md-6">
                                {{ form.unit|as_crispy_field }}
                            </div>
                        </div>
                    {% endif %}
                    
                    <div class="mt-3">
                        <button type="submit" class="btn btn-primary">
                            <i class="bi bi-check-circle me-2"></i>
                            Save BOM Entry
                        </button>
                        <a href="{% url 'manufacture:bom_list' %}" class="btn btn-outline-secondary ms-2">
                            Cancel
                        </a>
                    </div>
                </form>
            </div>
        </div>
    
    <div class="col-md-4">
        <div class="card">
            <div class="card-header">
                <h5 class="card-title mb-0">BOM Tips</h5>
            </div>
            <div class="card-body">
                <ul class="list-unstyled mb-0">
                    <li class="mb-2">
                        <i class="bi bi-info-circle text-primary me-2"></i>
                        Select the manufactured product and component
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-calculator text-success me-2"></i>
                        Enter the exact quantity needed
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-rulers text-info me-2"></i>
                        Unit of measurement is automatically populated
                    </li>
                    {% if component_formset %}
                    <li class="mb-2">
                        <i class="bi bi-plus-circle text-warning me-2"></i>
                        Add multiple components dynamically
                    </li>
                    <li class="mb-2">
                        <i class="bi bi-dash-circle text-danger me-2"></i>
                        Remove components you don't need
                    </li>
                    {% endif %}
                </ul>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block extra_js %}
<script>
document.addEventListener('DOMContentLoaded', function() {
    // Get CSRF token
    function getCookie(name) {
        let cookieValue = null;
        if (document.cookie && document.cookie !== '') {
            const cookies = document.cookie.split(';');
            for (let i = 0; i < cookies.length; i++) {
                const cookie = cookies[i].trim();
                if (cookie.substring(0, name.length + 1) === (name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }
    
    // Function to update unit field based on selected component
    function updateUnitField(componentSelect, unitInput) {
        const productId = componentSelect.value;
        
        if (!productId) {
            unitInput.value = '';
            return;
        }
        
        // Make AJAX call to get product info
        fetch(`/manufacture/bom/product/${productId}/info/`, {
            method: 'GET',
            headers: {
                'X-CSRFToken': getCookie('csrftoken'),
                'Content-Type': 'application/json',
            },
            credentials: 'same-origin'
        })
        .then(response => {
            if (!response.ok) {
                throw new Error('Network response was not ok');
            }
            return response.json();
        })
        .then(data => {
            if (data.unit) {
                unitInput.value = data.unit;
            } else {
                unitInput.value = '';
            }
        })
        .catch(error => {
            console.error('Error fetching product info:', error);
            unitInput.value = '';
        });
    }
    
    // Check if we have the dynamic form
    if (document.getElementById('component-forms-container')) {
        // Add component button
        document.getElementById('add-component').addEventListener('click', function() {
            var container = document.getElementById('component-forms-container');
            var formCount = container.querySelectorAll('.component-form').length;
            var totalForms = document.getElementById('id_component-TOTAL_FORMS');
            
            // Clone the first form as a template
            var firstForm = container.querySelector('.component-form');
            var newForm = firstForm.cloneNode(true);
            
            // Update form indices
            var newFormIndex = formCount;
            var formRegex = /component-\d+/g;
            
            // Update all input names and IDs
            newForm.innerHTML = newForm.innerHTML.replace(formRegex, 'component-' + newFormIndex);
            
            // Clear input values
            var inputs = newForm.querySelectorAll('input, select, textarea');
            inputs.forEach(function(input) {
                if (input.type === 'checkbox' || input.type === 'radio') {
                    input.checked = false;
                } else if (input.type !== 'hidden') {
                    input.value = '';
                }
            });
            
            // Update header
            var header = newForm.querySelector('.card-header h6');
            header.textContent = 'Component #' + (newFormIndex + 1);
            
            // Add remove button if it doesn't exist
            var removeButtonContainer = newForm.querySelector('.card-header');
            if (!removeButtonContainer.querySelector('.remove-component')) {
                var removeButton = document.createElement('button');
                removeButton.type = 'button';
                removeButton.className = 'btn btn-sm btn-outline-danger remove-component';
                removeButton.innerHTML = '<i class="bi bi-trash"></i> Remove';
                removeButtonContainer.appendChild(removeButton);
            }
            
            // Add event listener to the new remove button
            var newRemoveButton = newForm.querySelector('.remove-component');
            newRemoveButton.addEventListener('click', function() {
                newForm.remove();
                updateFormIndices();
            });
            
            // Add event listener to the new component select
            var newComponentSelect = newForm.querySelector('select[id^="id_component-"][id$="-component"]');
            var newUnitInput = newForm.querySelector('input[id^="id_component-"][id$="-unit"]');
            if (newComponentSelect && newUnitInput) {
                newComponentSelect.addEventListener('change', function() {
                    updateUnitField(this, newUnitInput);
                });
            }
            
            // Append new form
            container.appendChild(newForm);
            
            // Update total forms count
            totalForms.value = formCount + 1;
        });
        
        // Remove component buttons
        document.querySelectorAll('.remove-component').forEach(function(button) {
            button.addEventListener('click', function() {
                var form = this.closest('.component-form');
                form.remove();
                updateFormIndices();
            });
        });
        
        // Add event listeners to existing component selects
        document.querySelectorAll('.component-form select[id$="-component"]').forEach(function(select) {
            var unitInput = select.closest('.component-form').querySelector('input[id$="-unit"]');
            if (unitInput) {
                select.addEventListener('change', function() {
                    updateUnitField(this, unitInput);
                });
                
                // Initialize unit field if component is already selected
                if (select.value) {
                    updateUnitField(select, unitInput);
                }
            }
        });
        
        // Update form indices function
        function updateFormIndices() {
            var forms = document.querySelectorAll('.component-form');
            var totalForms = document.getElementById('id_component-TOTAL_FORMS');
            
            forms.forEach(function(form, index) {
                // Update header
                var header = form.querySelector('.card-header h6');
                header.textContent = 'Component #' + (index + 1);
                
                // Update form indices in names and IDs
                var formRegex = /component-\d+/g;
                form.innerHTML = form.innerHTML.replace(formRegex, 'component-' + index);
                
                // Update event listeners for component selects
                var componentSelect = form.querySelector('select[id$="-component"]');
                var unitInput = form.querySelector('input[id$="-unit"]');
                if (componentSelect && unitInput) {
                    // Remove existing event listeners by cloning
                    var newSelect = componentSelect.cloneNode(true);
                    componentSelect.parentNode.replaceChild(newSelect, componentSelect);
                    
                    // Add new event listener
                    newSelect.addEventListener('change', function() {
                        updateUnitField(this, unitInput);
                    });
                }
                
                // Update remove button event listener
                var removeButton = form.querySelector('.remove-component');
                if (removeButton) {
                    // Remove existing event listener by cloning
                    var newRemoveButton = removeButton.cloneNode(true);
                    removeButton.parentNode.replaceChild(newRemoveButton, removeButton);
                    
                    // Add new event listener
                    newRemoveButton.addEventListener('click', function() {
                        form.remove();
                        updateFormIndices();
                    });
                }
            });
            
            // Update total forms count
            totalForms.value = forms.length;
        }
    }
});
</script>
{% endblock %}