<?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();

// Check if domain and project ID are provided
if (!isset($_GET['domain']) || !isset($_GET['id'])) {
    header("Location: project_manage.php");
    exit;
}

$domainNumber = intval($_GET['domain']);
$projectId = intval($_GET['id']);
$domainTable = "domain_" . $domainNumber;

// Initialize variables
$success = '';
$error = '';
$project = null;

// Check if the domain table exists
$tableCheckQuery = "SHOW TABLES LIKE '$domainTable'";
$tableExists = $conn->query($tableCheckQuery)->num_rows > 0;

if (!$tableExists) {
    $error = "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;
    }
    
    // Process form submission
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        // Validate form data
        $projectName = isset($_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 (empty($projectName) || empty($projectType)) {
            $error = "Please provide project name and project type.";
        } else {
            // Prepare the SQL for update
            $updates = [];
            $values = [];
            $types = '';
            
            // Add project name field
            $updates[] = "`$projectNameField` = ?";
            $values[] = $projectName;
            $types .= 's'; // string for Project Name
            
            // Add project type field (H/S)
            if (isset($columns['H/S'])) {
                $updates[] = "`H/S` = ?";
                $values[] = $projectType;
                $types .= 's'; // string for H/S
            }
            
            // Add description field
            if (isset($columns['Description'])) {
                $updates[] = "`Description` = ?";
                $values[] = $description;
                $types .= 's'; // string for Description
            }
            
            // Add email field
            if (isset($columns['Email'])) {
                $updates[] = "`Email` = ?";
                $values[] = $email;
                $types .= 's'; // string for Email
            }
            
            // Add links field
            if (isset($columns['Links'])) {
                $updates[] = "`Links` = ?";
                $values[] = $links;
                $types .= 's'; // string for Links
            }
            
            // Add additional fields
            foreach ($additionalFields as $field => $value) {
                if (isset($columns[$field])) {
                    $updates[] = "`$field` = ?";
                    $values[] = $value;
                    $types .= 's'; // string for additional fields
                }
            }
            
            // Add project ID for WHERE clause
            $values[] = $projectId;
            $types .= 'i'; // integer for Project_ID
            
            // Prepare and execute the update query
            $updateQuery = "UPDATE $domainTable SET " . implode(', ', $updates) . " WHERE Project_ID = ?";
            $stmt = $conn->prepare($updateQuery);
            
            if ($stmt) {
                // Dynamically bind parameters
                $bindParams = array_merge([$types], $values);
                $ref_params = [];
                
                foreach ($bindParams as $key => $value) {
                    $ref_params[$key] = &$bindParams[$key];
                }
                
                call_user_func_array([$stmt, 'bind_param'], $ref_params);
                
                if ($stmt->execute()) {
                    $success = "Project updated successfully.";
                    
                    // Refresh project data
                    $projectQuery = "SELECT * FROM $domainTable WHERE Project_ID = ? LIMIT 1";
                    $projectStmt = $conn->prepare($projectQuery);
                    $projectStmt->bind_param('i', $projectId);
                    $projectStmt->execute();
                    $projectResult = $projectStmt->get_result();
                    $project = $projectResult->fetch_assoc();
                    $projectStmt->close();
                } else {
                    $error = "Error updating project: " . $stmt->error;
                }
                
                $stmt->close();
            } else {
                $error = "Error preparing query: " . $conn->error;
            }
        }
    } else {
        // Fetch project details
        $projectQuery = "SELECT * FROM $domainTable WHERE Project_ID = ? LIMIT 1";
        $stmt = $conn->prepare($projectQuery);
        $stmt->bind_param('i', $projectId);
        $stmt->execute();
        $result = $stmt->get_result();
        
        if ($result && $result->num_rows > 0) {
            $project = $result->fetch_assoc();
        } else {
            $error = "Project not found.";
        }
        
        $stmt->close();
    }
}

// Get domain descriptions
$domainDescriptions = getDomainDescriptions($conn);
$domainDescription = isset($domainDescriptions[$domainNumber]) ? $domainDescriptions[$domainNumber] : "Domain $domainNumber";

// 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="project_manage.php">Manage Projects</a></li>
                <li class="breadcrumb-item active">Edit Project</li>
            </ol>
        </nav>
        <div class="d-flex justify-content-between align-items-center">
            <h2><i class="fas fa-edit me-2"></i> Edit Project</h2>
            <div>
                <a href="project_details.php?domain=<?php echo urlencode($domainNumber); ?>&id=<?php echo urlencode($projectId); ?>" class="btn btn-info">
                    <i class="fas fa-eye me-1"></i> View Project
                </a>
                <a href="project_manage.php" class="btn btn-secondary">
                    <i class="fas fa-arrow-left me-1"></i> Back to List
                </a>
            </div>
        </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; ?>

<?php if ($project): ?>
<div class="row">
    <div class="col-md-12">
        <div class="card shadow-sm">
            <div class="card-header bg-primary text-white">
                <h5 class="mb-0"><i class="fas fa-edit me-2"></i> Project Details</h5>
            </div>
            <div class="card-body">
                <form method="post" action="project_edit.php?domain=<?php echo urlencode($domainNumber); ?>&id=<?php echo urlencode($projectId); ?>" id="projectForm">
                    <div class="row">
                        <div class="col-md-6 mb-3">
                            <label class="form-label">Domain</label>
                            <input type="text" class="form-control" value="Domain <?php echo htmlspecialchars($domainNumber); ?>: <?php echo htmlspecialchars($domainDescription); ?>" disabled>
                        </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($project['H/S']) && $project['H/S'] === 'Hardware') ? 'selected' : ''; ?>>Hardware</option>
                                <option value="Software" <?php echo (isset($project['H/S']) && $project['H/S'] === '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($project[$projectNameField]); ?>" 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($project['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($project['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($project['Links'] ?? ''); ?>" placeholder="https://example1.com, https://example2.com">
                        </div>
                    </div>
                    
                    <div id="additional_fields">
                        <?php foreach ($project as $field => $value): ?>
                            <?php if (!in_array($field, ['Project_ID', 'Domain_ID', $projectNameField, 'H/S', 'Description', 'Email', 'Links']) && !empty($field)): ?>
                                <div class="mb-3">
                                    <label for="additional_<?php echo htmlspecialchars($field); ?>" class="form-label"><?php echo htmlspecialchars($field); ?></label>
                                    <input type="text" class="form-control" id="additional_<?php echo htmlspecialchars($field); ?>" name="additional_<?php echo htmlspecialchars($field); ?>" value="<?php echo htmlspecialchars($value); ?>">
                                </div>
                            <?php endif; ?>
                        <?php endforeach; ?>
                    </div>
                    
                    <div class="d-grid gap-2 d-md-flex justify-content-md-end mt-4">
                        <a href="project_manage.php" class="btn btn-secondary">
                            <i class="fas fa-times me-1"></i> Cancel
                        </a>
                        <button type="submit" class="btn btn-primary">
                            <i class="fas fa-save me-1"></i> Save Changes
                        </button>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>
<?php endif; ?>

<?php
// Include footer
include 'includes/footer.php';

// Close connection
$conn->close();
?>