<?php
// Include database connection and authentication
require_once 'includes/db_connect.php';
require_once 'includes/domain_utils.php';
require_once 'includes/auth_check.php';

// Ensure only faculty can access this page
requireFaculty();

// Get all domain tables
$domainTables = getDomainTables($conn);
$domainDescriptions = getDomainDescriptions($conn);
$success = '';
$error = '';

// Process form submission
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Validate form data
    $domainNumber = isset($_POST['domain']) ? intval($_POST['domain']) : 0;
    $projectName = isset($_POST['project_name']) ? trim($_POST['project_name']) : '';
    $projectType = isset($_POST['project_type']) ? trim($_POST['project_type']) : '';
    $description = isset($_POST['description']) ? trim($_POST['description']) : '';
    $email = isset($_POST['email']) ? trim($_POST['email']) : '';
    $links = isset($_POST['links']) ? trim($_POST['links']) : '';
    
    // Additional fields (if any)
    $additionalFields = [];
    foreach ($_POST as $key => $value) {
        if (strpos($key, 'additional_') === 0) {
            $fieldName = substr($key, 11); // Remove 'additional_' prefix
            $additionalFields[$fieldName] = trim($value);
        }
    }
    
    // Basic validation
    if ($domainNumber <= 0 || empty($projectName) || empty($projectType)) {
        $error = "Please provide domain, project name, and project type.";
    } else {
        // Determine domain table name
        $domainTable = "domain_" . $domainNumber;
        
        // Check if the domain table exists
        $tableCheckQuery = "SHOW TABLES LIKE '$domainTable'";
        $tableExists = $conn->query($tableCheckQuery)->num_rows > 0;
        
        if (!$tableExists) {
            $error = "Selected domain table does not exist.";
        } else {
            // Get the correct project name field for this domain
            $projectNameField = getProjectNameField($conn, $domainTable);
            
            // Get the columns of the domain table to determine field structure
            $columnsQuery = "SHOW COLUMNS FROM $domainTable";
            $columnsResult = $conn->query($columnsQuery);
            $columns = [];
            
            while ($column = $columnsResult->fetch_assoc()) {
                $columns[$column['Field']] = $column;
            }
            
            // Generate a new project ID
            $maxIdQuery = "SELECT MAX(Project_ID) as max_id FROM $domainTable";
            $maxIdResult = $conn->query($maxIdQuery);
            $maxId = 1; // Default if no projects exist
            
            if ($maxIdResult && $row = $maxIdResult->fetch_assoc()) {
                $maxId = (!is_null($row['max_id'])) ? intval($row['max_id']) + 1 : 1;
            }
            
            // Prepare the SQL for insertion
            $fields = ['Project_ID'];
            $values = [$maxId];
            $types = 'i'; // integer for Project_ID
            
            // Add Domain_ID field if it exists
            if (isset($columns['Domain_ID'])) {
                $fields[] = 'Domain_ID';
                $domainId = "D-" . $domainNumber;
                $values[] = $domainId;
                $types .= 's'; // string for Domain_ID
            }
            
            // Add project name field
            $fields[] = $projectNameField;
            $values[] = $projectName;
            $types .= 's'; // string for Project Name
            
            // Add project type field (H/S)
            if (isset($columns['H/S'])) {
                $fields[] = 'H/S';
                $values[] = $projectType;
                $types .= 's'; // string for H/S
            }
            
            // Add description field
            if (isset($columns['Description']) && !empty($description)) {
                $fields[] = 'Description';
                $values[] = $description;
                $types .= 's'; // string for Description
            }
            
            // Add email field
            if (isset($columns['Email']) && !empty($email)) {
                $fields[] = 'Email';
                $values[] = $email;
                $types .= 's'; // string for Email
            }
            
            // Add links field
            if (isset($columns['Links']) && !empty($links)) {
                $fields[] = 'Links';
                $values[] = $links;
                $types .= 's'; // string for Links
            }
            
            // Add additional fields
            foreach ($additionalFields as $field => $value) {
                if (isset($columns[$field]) && !empty($value)) {
                    $fields[] = $field;
                    $values[] = $value;
                    $types .= 's'; // string for additional fields
                }
            }
            
            // Prepare and execute the insert query
            $fieldStr = implode(', ', array_map(function($field) { return "`$field`"; }, $fields));
            $placeholders = implode(', ', array_fill(0, count($fields), '?'));
            
            $insertQuery = "INSERT INTO $domainTable ($fieldStr) VALUES ($placeholders)";
            $stmt = $conn->prepare($insertQuery);
            
            if ($stmt) {
                // Dynamically bind parameters
                $params = array_merge([$types], $values);
                $ref_params = [];
                
                foreach ($params as $key => $value) {
                    $ref_params[$key] = &$params[$key];
                }
                
                call_user_func_array([$stmt, 'bind_param'], $ref_params);
                
                if ($stmt->execute()) {
                    $success = "Project added successfully with ID: $maxId";
                    
                    // Clear form after successful submission
                    $projectName = $description = $email = $links = '';
                    $projectType = '';
                    $additionalFields = [];
                } else {
                    $error = "Error adding project: " . $stmt->error;
                }
                
                $stmt->close();
            } else {
                $error = "Error preparing query: " . $conn->error;
            }
        }
    }
}

// Include header
include 'includes/header.php';
?>

<div class="row mb-4">
    <div class="col-md-12">
        <nav aria-label="breadcrumb">
            <ol class="breadcrumb">
                <li class="breadcrumb-item"><a href="index.php">Home</a></li>
                <li class="breadcrumb-item"><a href="domains.php">Domains</a></li>
                <li class="breadcrumb-item"><a href="project_manage.php">Manage Projects</a></li>
                <li class="breadcrumb-item active">Add Project</li>
            </ol>
        </nav>
        <div class="d-flex justify-content-between align-items-center">
            <h2><i class="fas fa-plus-circle me-2"></i> Add New Project</h2>
            <a href="project_manage.php" class="btn btn-secondary">
                <i class="fas fa-arrow-left me-1"></i> Back to Projects
            </a>
        </div>
    </div>
</div>

<?php if (!empty($success)): ?>
<div class="alert alert-success">
    <i class="fas fa-check-circle me-2"></i> <?php echo $success; ?>
</div>
<?php endif; ?>

<?php if (!empty($error)): ?>
<div class="alert alert-danger">
    <i class="fas fa-exclamation-circle me-2"></i> <?php echo $error; ?>
</div>
<?php endif; ?>

<div class="row">
    <div class="col-md-12">
        <div class="card shadow-sm">
            <div class="card-header bg-primary text-white">
                <h5 class="mb-0"><i class="fas fa-edit me-2"></i> Project Details</h5>
            </div>
            <div class="card-body">
                <form method="post" action="project_add.php" id="projectForm">
                    <div class="row">
                        <div class="col-md-6 mb-3">
                            <label for="domain" class="form-label">Domain *</label>
                            <select class="form-select" id="domain" name="domain" required>
                                <option value="">Select Domain</option>
                                <?php foreach ($domainTables as $domainTable): 
                                    $domainNum = str_replace('domain_', '', $domainTable);
                                    $domainDesc = isset($domainDescriptions[$domainNum]) ? $domainDescriptions[$domainNum] : "Domain $domainNum";
                                ?>
                                    <option value="<?php echo $domainNum; ?>" <?php echo (isset($_POST['domain']) && $_POST['domain'] == $domainNum) ? 'selected' : ''; ?>>
                                        Domain <?php echo $domainNum; ?>: <?php echo htmlspecialchars($domainDesc); ?>
                                    </option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        
                        <div class="col-md-6 mb-3">
                            <label for="project_type" class="form-label">Project Type *</label>
                            <select class="form-select" id="project_type" name="project_type" required>
                                <option value="">Select Type</option>
                                <option value="Hardware" <?php echo (isset($_POST['project_type']) && $_POST['project_type'] == 'Hardware') ? 'selected' : ''; ?>>Hardware</option>
                                <option value="Software" <?php echo (isset($_POST['project_type']) && $_POST['project_type'] == 'Software') ? 'selected' : ''; ?>>Software</option>
                            </select>
                        </div>
                    </div>
                    
                    <div class="mb-3">
                        <label for="project_name" class="form-label">Project Name *</label>
                        <input type="text" class="form-control" id="project_name" name="project_name" value="<?php echo htmlspecialchars($projectName ?? ''); ?>" required>
                    </div>
                    
                    <div class="mb-3">
                        <label for="description" class="form-label">Description</label>
                        <textarea class="form-control" id="description" name="description" rows="4"><?php echo htmlspecialchars($description ?? ''); ?></textarea>
                    </div>
                    
                    <div class="row">
                        <div class="col-md-6 mb-3">
                            <label for="email" class="form-label">Contact Email</label>
                            <input type="email" class="form-control" id="email" name="email" value="<?php echo htmlspecialchars($email ?? ''); ?>">
                        </div>
                        
                        <div class="col-md-6 mb-3">
                            <label for="links" class="form-label">Links (Comma separated)</label>
                            <input type="text" class="form-control" id="links" name="links" value="<?php echo htmlspecialchars($links ?? ''); ?>" placeholder="https://example1.com, https://example2.com">
                        </div>
                    </div>
                    
                    <div id="additional_fields">
                        <!-- Additional fields will be loaded here based on domain selection -->
                    </div>
                    
                    <div class="d-grid gap-2 d-md-flex justify-content-md-end mt-4">
                        <button type="reset" class="btn btn-outline-secondary">
                            <i class="fas fa-undo me-1"></i> Reset
                        </button>
                        <button type="submit" class="btn btn-primary">
                            <i class="fas fa-save me-1"></i> Add Project
                        </button>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>

<script>
document.addEventListener('DOMContentLoaded', function() {
    // Function to load additional fields based on domain selection
    function loadAdditionalFields() {
        const domainSelect = document.getElementById('domain');
        const additionalFieldsContainer = document.getElementById('additional_fields');
        const selectedDomain = domainSelect.value;
        
        if (!selectedDomain) {
            additionalFieldsContainer.innerHTML = '';
            return;
        }
        
        // Show loading indicator
        additionalFieldsContainer.innerHTML = '<div class="text-center my-3"><div class="spinner-border text-primary" role="status"><span class="visually-hidden">Loading...</span></div></div>';
        
        // Use AJAX to get table structure
        fetch('ajax/get_domain_fields.php?domain=' + selectedDomain)
            .then(response => response.json())
            .then(data => {
                let html = '<h5 class="mt-4 mb-3">Additional Fields</h5>';
                
                if (data.error) {
                    html = `<div class="alert alert-danger mt-3">${data.error}</div>`;
                } else if (data.fields && data.fields.length > 0) {
                    data.fields.forEach(field => {
                        // Skip standard fields we already have in the form
                        if (['Project_ID', 'Domain_ID', 'Project_Name', 'H/S', 'Description', 'Email', 'Links'].includes(field.name)) {
                            return;
                        }
                        
                        html += `
                        <div class="mb-3">
                            <label for="additional_${field.name}" class="form-label">${field.name}</label>
                            <input type="text" class="form-control" id="additional_${field.name}" name="additional_${field.name}" 
                                value="${field.value || ''}">
                        </div>`;
                    });
                } else {
                    html = '<div class="alert alert-info mt-3">No additional fields found for this domain.</div>';
                }
                
                additionalFieldsContainer.innerHTML = html;
            })
            .catch(error => {
                additionalFieldsContainer.innerHTML = `<div class="alert alert-danger mt-3">Error loading fields: ${error.message}</div>`;
            });
    }
    
    // Initialize
    const domainSelect = document.getElementById('domain');
    domainSelect.addEventListener('change', loadAdditionalFields);
    
    // Load fields if domain is already selected (e.g., after form validation failure)
    if (domainSelect.value) {
        loadAdditionalFields();
    }
});
</script>

<?php
// Include footer
include 'includes/footer.php';

// Close connection
$conn->close();
?>