{% extends "base.html" %}
{% load static %}

{% block title %}Delete {{ object.name }} - {{ block.super }}{% endblock %}

{% block content %}
<div class="container-fluid">
    <!-- Page Header -->
    <div class="d-flex justify-content-between align-items-center mb-4">
        <div>
            <h1 class="h3 mb-1 text-danger">
                <i class="fas fa-exclamation-triangle me-2"></i>Delete External System
            </h1>
            <nav aria-label="breadcrumb">
                <ol class="breadcrumb mb-0">
                    <li class="breadcrumb-item"><a href="{% url 'integration:dashboard' %}">Integration</a></li>
                    <li class="breadcrumb-item"><a href="{% url 'integration:external_system_list' %}">External Systems</a></li>
                    <li class="breadcrumb-item"><a href="{% url 'integration:external_system_detail' object.system_id %}">{{ object.name }}</a></li>
                    <li class="breadcrumb-item active">Delete</li>
                </ol>
            </nav>
        </div>
    </div>

    <div class="row justify-content-center">
        <div class="col-lg-8">
            <!-- Warning Card -->
            <div class="card border-danger mb-4">
                <div class="card-header bg-danger text-white">
                    <h5 class="mb-0">
                        <i class="fas fa-exclamation-triangle me-2"></i>Confirm System Deletion
                    </h5>
                </div>
                <div class="card-body">
                    <div class="alert alert-danger d-flex align-items-center" role="alert">
                        <i class="fas fa-exclamation-triangle fa-2x me-3"></i>
                        <div>
                            <h6 class="alert-heading mb-1">Warning: This action cannot be undone!</h6>
                            <p class="mb-0">You are about to permanently delete the external system <strong>"{{ object.name }}"</strong>. This will remove all associated data and configurations.</p>
                        </div>
                    </div>

                    <!-- System Information -->
                    <div class="row mb-4">
                        <div class="col-md-6">
                            <h6 class="text-muted mb-3">System Details</h6>
                            <table class="table table-borderless table-sm">
                                <tr>
                                    <td class="text-muted" width="100">Name:</td>
                                    <td class="fw-semibold">{{ object.name }}</td>
                                </tr>
                                <tr>
                                    <td class="text-muted">Type:</td>
                                    <td>
                                        <span class="badge bg-secondary">{{ object.get_system_type_display }}</span>
                                    </td>
                                </tr>
                                <tr>
                                    <td class="text-muted">Vendor:</td>
                                    <td>{{ object.vendor|default:"Not specified" }}</td>
                                </tr>
                                <tr>
                                    <td class="text-muted">Status:</td>
                                    <td>
                                        <span class="badge bg-{% if object.is_active %}success{% else %}secondary{% endif %}">
                                            {% if object.is_active %}Active{% else %}Inactive{% endif %}
                                        </span>
                                    </td>
                                </tr>
                                <tr>
                                    <td class="text-muted">Created:</td>
                                    <td>{{ object.created_at|date:"M d, Y" }}</td>
                                </tr>
                            </table>
                        </div>
                        <div class="col-md-6">
                            <h6 class="text-muted mb-3">Connection Details</h6>
                            <table class="table table-borderless table-sm">
                                {% if object.base_url %}
                                <tr>
                                    <td class="text-muted" width="100">Base URL:</td>
                                    <td><code class="small">{{ object.base_url|truncatechars:40 }}</code></td>
                                </tr>
                                {% endif %}
                                {% if object.host %}
                                <tr>
                                    <td class="text-muted">Host:</td>
                                    <td><code class="small">{{ object.host }}{% if object.port %}:{{ object.port }}{% endif %}</code></td>
                                </tr>
                                {% endif %}
                                <tr>
                                    <td class="text-muted">Auth Type:</td>
                                    <td>
                                        <span class="badge bg-info small">{{ object.get_authentication_type_display }}</span>
                                    </td>
                                </tr>
                                {% if object.database_name %}
                                <tr>
                                    <td class="text-muted">Database:</td>
                                    <td><code class="small">{{ object.database_name }}</code></td>
                                </tr>
                                {% endif %}
                            </table>
                        </div>
                    </div>

                    <!-- Impact Assessment -->
                    <div class="card border-warning mb-4">
                        <div class="card-header bg-warning text-dark">
                            <h6 class="mb-0">
                                <i class="fas fa-impact me-2"></i>Deletion Impact Assessment
                            </h6>
                        </div>
                        <div class="card-body">
                            <div class="row">
                                <div class="col-md-3 text-center mb-3">
                                    <div class="bg-primary bg-gradient rounded-circle d-flex align-items-center justify-content-center mx-auto mb-2" style="width: 60px; height: 60px;">
                                        <i class="fas fa-link fa-lg text-white"></i>
                                    </div>
                                    <h4 class="text-primary mb-0">{{ related_endpoints_count }}</h4>
                                    <small class="text-muted">Endpoints</small>
                                    {% if related_endpoints_count > 0 %}
                                    <div class="text-danger small mt-1">Will be deleted</div>
                                    {% endif %}
                                </div>
                                
                                <div class="col-md-3 text-center mb-3">
                                    <div class="bg-info bg-gradient rounded-circle d-flex align-items-center justify-content-center mx-auto mb-2" style="width: 60px; height: 60px;">
                                        <i class="fas fa-exchange-alt fa-lg text-white"></i>
                                    </div>
                                    <h4 class="text-info mb-0">{{ related_mappings_count }}</h4>
                                    <small class="text-muted">Data Mappings</small>
                                    {% if related_mappings_count > 0 %}
                                    <div class="text-danger small mt-1">Will be deleted</div>
                                    {% endif %}
                                </div>
                                
                                <div class="col-md-3 text-center mb-3">
                                    <div class="bg-success bg-gradient rounded-circle d-flex align-items-center justify-content-center mx-auto mb-2" style="width: 60px; height: 60px;">
                                        <i class="fas fa-play fa-lg text-white"></i>
                                    </div>
                                    <h4 class="text-success mb-0">{{ related_executions_count }}</h4>
                                    <small class="text-muted">Executions</small>
                                    {% if related_executions_count > 0 %}
                                    <div class="text-warning small mt-1">History preserved</div>
                                    {% endif %}
                                </div>
                                
                                <div class="col-md-3 text-center mb-3">
                                    <div class="bg-secondary bg-gradient rounded-circle d-flex align-items-center justify-content-center mx-auto mb-2" style="width: 60px; height: 60px;">
                                        <i class="fas fa-file-alt fa-lg text-white"></i>
                                    </div>
                                    <h4 class="text-secondary mb-0">{{ related_logs_count }}</h4>
                                    <small class="text-muted">Log Entries</small>
                                    {% if related_logs_count > 0 %}
                                    <div class="text-warning small mt-1">History preserved</div>
                                    {% endif %}
                                </div>
                            </div>
                            
                            {% if related_endpoints_count > 0 or related_mappings_count > 0 %}
                            <div class="alert alert-warning mt-3" role="alert">
                                <i class="fas fa-exclamation-triangle me-2"></i>
                                <strong>Data Loss Warning:</strong> 
                                Deleting this system will permanently remove {{ related_endpoints_count }} endpoint{{ related_endpoints_count|pluralize }} 
                                and {{ related_mappings_count }} data mapping{{ related_mappings_count|pluralize }}. 
                                This action cannot be undone.
                            </div>
                            {% endif %}
                            
                            {% if object.is_active %}
                            <div class="alert alert-danger mt-3" role="alert">
                                <i class="fas fa-exclamation-circle me-2"></i>
                                <strong>Active System Warning:</strong> 
                                This system is currently active and may be processing integrations. 
                                Consider deactivating it first to prevent disruption.
                            </div>
                            {% endif %}
                        </div>
                    </div>

                    <!-- Related Data Preview -->
                    {% if related_endpoints_count > 0 %}
                    <div class="card border-info mb-4">
                        <div class="card-header bg-light">
                            <h6 class="mb-0">
                                <i class="fas fa-link me-2"></i>Related Endpoints ({{ related_endpoints_count }})
                            </h6>
                        </div>
                        <div class="card-body">
                            <div class="row">
                                {% for endpoint in related_endpoints|slice:":6" %}
                                <div class="col-md-6 mb-2">
                                    <div class="d-flex align-items-center">
                                        <i class="fas fa-link text-primary me-2"></i>
                                        <div>
                                            <div class="fw-semibold small">{{ endpoint.name }}</div>
                                            <div class="text-muted small">{{ endpoint.get_method_display }} {{ endpoint.endpoint_path|truncatechars:30 }}</div>
                                        </div>
                                    </div>
                                </div>
                                {% endfor %}
                            </div>
                            {% if related_endpoints_count > 6 %}
                            <div class="text-muted small mt-2">
                                ... and {{ related_endpoints_count|add:"-6" }} more endpoint{{ related_endpoints_count|add:"-6"|pluralize }}
                            </div>
                            {% endif %}
                        </div>
                    </div>
                    {% endif %}

                    <!-- Confirmation Requirements -->
                    <div class="card border-dark">
                        <div class="card-header bg-dark text-white">
                            <h6 class="mb-0">
                                <i class="fas fa-check-square me-2"></i>Confirmation Requirements
                            </h6>
                        </div>
                        <div class="card-body">
                            <div class="form-check mb-3">
                                <input class="form-check-input" type="checkbox" id="confirmUnderstand" required>
                                <label class="form-check-label" for="confirmUnderstand">
                                    I understand that this action will permanently delete the external system and all associated configurations
                                </label>
                            </div>
                            
                            <div class="form-check mb-3">
                                <input class="form-check-input" type="checkbox" id="confirmDataLoss" required>
                                <label class="form-check-label" for="confirmDataLoss">
                                    I acknowledge that {{ related_endpoints_count }} endpoint{{ related_endpoints_count|pluralize }} and {{ related_mappings_count }} data mapping{{ related_mappings_count|pluralize }} will be permanently deleted
                                </label>
                            </div>
                            
                            {% if object.is_active %}
                            <div class="form-check mb-3">
                                <input class="form-check-input" type="checkbox" id="confirmActive" required>
                                <label class="form-check-label" for="confirmActive">
                                    I understand that this system is currently active and deleting it may disrupt ongoing integrations
                                </label>
                            </div>
                            {% endif %}
                            
                            <div class="form-check mb-4">
                                <input class="form-check-input" type="checkbox" id="confirmNoUndo" required>
                                <label class="form-check-label" for="confirmNoUndo">
                                    I confirm that this action cannot be undone and I have backed up any necessary data
                                </label>
                            </div>
                            
                            <div class="mb-3">
                                <label for="confirmationText" class="form-label">
                                    Type <strong>"{{ object.name }}"</strong> to confirm deletion:
                                </label>
                                <input type="text" class="form-control" id="confirmationText" 
                                       placeholder="Enter system name exactly as shown" required>
                                <div class="form-text">This helps prevent accidental deletions</div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <!-- Action Buttons -->
            <div class="card">
                <div class="card-body">
                    <form method="post" id="deleteForm">
                        {% csrf_token %}
                        <div class="d-flex justify-content-between align-items-center">
                            <div>
                                <a href="{% url 'integration:external_system_detail' object.system_id %}" class="btn btn-outline-secondary">
                                    <i class="fas fa-arrow-left me-2"></i>Cancel
                                </a>
                                {% if object.is_active %}
                                <a href="{% url 'integration:external_system_update' object.system_id %}" class="btn btn-outline-warning">
                                    <i class="fas fa-pause me-2"></i>Deactivate Instead
                                </a>
                                {% endif %}
                            </div>
                            <div>
                                <button type="button" class="btn btn-outline-info me-2" onclick="exportSystemData()">
                                    <i class="fas fa-download me-2"></i>Export Data First
                                </button>
                                <button type="submit" class="btn btn-danger" id="deleteButton" disabled>
                                    <i class="fas fa-trash me-2"></i>Delete System Permanently
                                </button>
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
// External system delete confirmation functionality
document.addEventListener('DOMContentLoaded', function() {
    const checkboxes = document.querySelectorAll('input[type="checkbox"]');
    const confirmationText = document.getElementById('confirmationText');
    const deleteButton = document.getElementById('deleteButton');
    const deleteForm = document.getElementById('deleteForm');
    const systemName = '{{ object.name }}';
    
    function validateForm() {
        const allChecked = Array.from(checkboxes).every(cb => cb.checked);
        const textMatches = confirmationText.value.trim() === systemName;
        
        deleteButton.disabled = !(allChecked && textMatches);
        
        if (allChecked && textMatches) {
            deleteButton.classList.remove('btn-danger');
            deleteButton.classList.add('btn-outline-danger');
        } else {
            deleteButton.classList.remove('btn-outline-danger');
            deleteButton.classList.add('btn-danger');
        }
    }
    
    // Add event listeners
    checkboxes.forEach(checkbox => {
        checkbox.addEventListener('change', validateForm);
    });
    
    confirmationText.addEventListener('input', validateForm);
    
    // Form submission with final confirmation
    deleteForm.addEventListener('submit', function(e) {
        e.preventDefault();
        
        if (!deleteButton.disabled) {
            const finalConfirm = confirm(
                `FINAL CONFIRMATION\n\n` +
                `You are about to permanently delete "${systemName}".\n\n` +
                `This will remove:\n` +
                `• {{ related_endpoints_count }} endpoint{{ related_endpoints_count|pluralize }}\n` +
                `• {{ related_mappings_count }} data mapping{{ related_mappings_count|pluralize }}\n` +
                `• All system configurations\n\n` +
                `This action CANNOT be undone.\n\n` +
                `Are you absolutely sure you want to proceed?`
            );
            
            if (finalConfirm) {
                // Show loading state
                deleteButton.innerHTML = '<i class="fas fa-spinner fa-spin me-2"></i>Deleting...';
                deleteButton.disabled = true;
                
                // Submit the form
                this.submit();
            }
        }
    });
    
    // Initial validation
    validateForm();
});

function exportSystemData() {
    const systemId = '{{ object.system_id }}';
    
    fetch(`/integration/systems/${systemId}/export-full/`, {
        method: 'GET',
        headers: {
            'X-CSRFToken': document.querySelector('[name=csrfmiddlewaretoken]').value,
        },
    })
    .then(response => response.blob())
    .then(blob => {
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.style.display = 'none';
        a.href = url;
        a.download = `{{ object.name|slugify }}-full-export.json`;
        document.body.appendChild(a);
        a.click();
        window.URL.revokeObjectURL(url);
        document.body.removeChild(a);
        
        alert('System data exported successfully. You can now proceed with deletion if needed.');
    })
    .catch(error => {
        console.error('Error exporting system data:', error);
        alert('Error exporting system data. Please try again.');
    });
}

// Prevent accidental page navigation
window.addEventListener('beforeunload', function(e) {
    const checkboxes = document.querySelectorAll('input[type="checkbox"]:checked');
    const confirmationText = document.getElementById('confirmationText');
    
    if (checkboxes.length > 0 || confirmationText.value.trim() !== '') {
        e.preventDefault();
        e.returnValue = '';
        return 'You have unsaved changes. Are you sure you want to leave?';
    }
});
</script>

<style>
.bg-gradient {
    background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0));
}

.table-borderless td {
    border: none;
    padding: 0.25rem 0;
}

.form-check-label {
    cursor: pointer;
    line-height: 1.4;
}

.form-check-input:checked {
    background-color: #dc3545;
    border-color: #dc3545;
}

.alert-heading {
    font-weight: 600;
}

code {
    background-color: #f8f9fa;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
}

.card-header.bg-danger {
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.card-header.bg-warning {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.card-header.bg-dark {
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .d-flex.justify-content-between {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .col-md-3 {
        margin-bottom: 1rem;
    }
}
</style>
{% endblock %}