{% extends 'base.html' %}

{% block title %}{{ module_title }} - Manufacturing App{% endblock %}

{% block content %}
<div class="container-fluid mt-4">
    <div class="row">
        <div class="col-md-8 offset-md-2">
            <div class="card">
                <div class="card-header">
                    <h4 class="mb-0">
                        <i class="fas fa-upload"></i> Restore Database
                    </h4>
                </div>
                <div class="card-body">
                    <div class="alert alert-danger">
                        <i class="fas fa-exclamation-triangle"></i>
                        <strong>Warning: Destructive Operation</strong>
                        <ul class="mb-0 mt-2">
                            <li>This operation will replace the current database with the uploaded backup</li>
                            <li>All current data will be permanently lost</li>
                            <li>A backup of the current database will be created automatically before restore</li>
                            <li>This action cannot be undone</li>
                        </ul>
                    </div>

                    <div class="alert alert-info">
                        <i class="fas fa-info-circle"></i>
                        <strong>Restore Process:</strong>
                        <ol class="mb-0 mt-2">
                            <li>Upload a valid SQLite database backup file (.db or .sqlite3)</li>
                            <li>Current database will be backed up automatically</li>
                            <li>Uploaded backup will replace the current database</li>
                            <li>System will verify the backup file integrity</li>
                            <li>Restore completion notification will be shown</li>
                        </ol>
                    </div>

                    <form method="post" enctype="multipart/form-data" id="restore-form">
                        {% csrf_token %}

                        <div class="mb-4">
                            <h5>Backup File Upload</h5>
                            <div class="mb-3">
                                <label for="backup_file" class="form-label">Select Backup File</label>
                                <input type="file" class="form-control" id="backup_file" name="backup_file"
                                       accept=".db,.sqlite3" required>
                                <div class="form-text">
                                    Only SQLite database files (.db, .sqlite3) are accepted.
                                </div>
                            </div>

                            <div class="mb-3">
                                <div class="form-check">
                                    <input class="form-check-input" type="checkbox" id="confirm-restore" required>
                                    <label class="form-check-label" for="confirm-restore">
                                        <strong>I understand that this will replace all current data and cannot be undone.</strong>
                                    </label>
                                </div>
                            </div>
                        </div>

                        <div class="alert alert-success">
                            <i class="fas fa-shield-alt"></i>
                            <strong>Safety Measures:</strong> A backup of the current database will be created automatically before the restore operation.
                        </div>

                        <div class="d-flex justify-content-between">
                            <a href="{% url 'database_management:dashboard' %}" class="btn btn-secondary">
                                <i class="fas fa-times"></i> Cancel
                            </a>
                            <button type="submit" class="btn btn-warning" id="restore-btn">
                                <i class="fas fa-upload"></i> Restore Database
                            </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>

<!-- File Upload Progress Modal -->
<div class="modal fade" id="uploadProgressModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Uploading Backup File</h5>
            </div>
            <div class="modal-body">
                <div class="progress mb-3">
                    <div class="progress-bar" role="progressbar" style="width: 0%"></div>
                </div>
                <p class="text-center mb-0">Please wait while the backup file is being uploaded...</p>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block extra_js %}
<script>
document.addEventListener('DOMContentLoaded', function() {
    const form = document.getElementById('restore-form');
    const restoreBtn = document.getElementById('restore-btn');
    const confirmCheckbox = document.getElementById('confirm-restore');
    const fileInput = document.getElementById('backup_file');

    // Enable/disable restore button based on confirmation checkbox
    confirmCheckbox.addEventListener('change', function() {
        restoreBtn.disabled = !this.checked;
    });

    // Validate file type
    fileInput.addEventListener('change', function() {
        const file = this.files[0];
        if (file) {
            const validExtensions = ['.db', '.sqlite3'];
            const fileName = file.name.toLowerCase();
            const isValid = validExtensions.some(ext => fileName.endsWith(ext));

            if (!isValid) {
                alert('Please select a valid SQLite database file (.db or .sqlite3)');
                this.value = '';
            }
        }
    });

    form.addEventListener('submit', function(e) {
        if (!confirmCheckbox.checked) {
            e.preventDefault();
            alert('Please confirm that you understand the restore operation.');
            return;
        }

        if (!fileInput.files[0]) {
            e.preventDefault();
            alert('Please select a backup file to restore.');
            return;
        }

        // Show progress modal
        const progressModal = new bootstrap.Modal(document.getElementById('uploadProgressModal'));
        progressModal.show();

        restoreBtn.disabled = true;
        restoreBtn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Restoring...';

        // Allow form to submit normally
    });
});
</script>
{% endblock %}