<?php 
include("include/header.php"); 



$error = [];
$success = "";

// 2. Form Submission Logic
if (isset($_POST['intern_submit'])) {
    $name          = mysqli_real_escape_string($con, $_POST['name']);
    $email         = mysqli_real_escape_string($con, $_POST['email']);
    $contact       = mysqli_real_escape_string($con, $_POST['contact']);
    $institute     = mysqli_real_escape_string($con, $_POST['institute']);
    $main_stream   = mysqli_real_escape_string($con, $_POST['main_stream']);
    $semester      = mysqli_real_escape_string($con, $_POST['semester']);
    $intern_stream = mysqli_real_escape_string($con, $_POST['intern_stream']);
    $tenure        = mysqli_real_escape_string($con, $_POST['tenure']);
    $about         = mysqli_real_escape_string($con, $_POST['about']);
    
    // Captcha Validation
    if ($_POST['captcha_res'] != $_POST['captcha_val']) {
        $error['captcha'] = "Wrong Captcha! Try again.";
    }

    // Email & Mobile Validation
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $error['email'] = "Invalid Email format!";
    }
    if (!preg_match('/^[0-9]{10}+$/', $contact)) {
        $error['contact'] = "Enter exactly 10 digits!";
    }

    // --- File Upload Logic ---
    $file_name_to_db = ""; // Sirf file name store karne ke liye
    if (isset($_FILES['resume']) && $_FILES['resume']['error'] == 0) {
        $allowed = ['pdf'];
        $filename = $_FILES['resume']['name'];
        $ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
        
        $finfo = finfo_open(FILEINFO_MIME_TYPE);
        $mime = finfo_file($finfo, $_FILES['resume']['tmp_name']);

        if (!in_array($ext, $allowed) || $mime != 'application/pdf') {
            $error['resume'] = "Only PDF files are allowed!";
        } else {
            // 1. Naya Unique File Name banayein
            $new_filename = time() . "_" . preg_replace("/[^a-zA-Z0-9.]/", "_", $filename);
            
            // 2. Folder ka rasta (sirf move karne ke liye)
            $target_dir = "uploads/";
            
            if (!is_dir($target_dir)) {
                mkdir($target_dir, 0777, true);
            }

            // 3. File ko folder mein move karein
            if (move_uploaded_file($_FILES['resume']['tmp_name'], $target_dir . $new_filename)) {
                // YAHAN BADLAV HAI: DB ke liye sirf file ka naam rakhein
                $file_name_to_db = $new_filename; 
            } else {
                $error['resume'] = "Failed to upload file.";
            }
        }
    } else {
        $error['resume'] = "Resume is required!";
    }

    // 3. Database mein Data Insert karein
    if (empty($error)) {
        // SQL query mein ab $file_name_to_db jayega (jisme "uploads/" nahi hai)
        $sql = "INSERT INTO internship_applications 
                (name, email, contact, institute, main_stream, semester, intern_stream, tenure, about, resume_path, status) 
                VALUES ('$name', '$email', '$contact', '$institute', '$main_stream', '$semester', '$intern_stream', '$tenure', '$about', '$file_name_to_db', 'Pending')";

        if (mysqli_query($con, $sql)) {
            $success = "Registration Successful!";
            unset($_POST);
        } else {
            $error['db'] = "Database Error: " . mysqli_error($con);
        }
    }
}

// Generate Random Captcha
$num1 = rand(1, 9);
$num2 = rand(1, 9);
$captcha_ans = $num1 + $num2;
?>

<style>
    .text-danger { color: #dc3545; font-size: 0.85rem; font-weight: bold; }
    .is-invalid { border: 2px solid #dc3545 !important; }
    label { font-weight: 600; margin-bottom: 5px; color: #333; }
    .box.form { background: #fff; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); border: 1px solid #eee; }
</style>

<section class="breadcrumbs">
    <div class="container">
        <div class="d-flex justify-content-between align-items-center">
            <h2>Internship Registration</h2>
            <ol>
                <li><a href="index.php">Home</a></li>
                <li>Internship</li>
            </ol>
        </div>
    </div>
</section>

<section class="blog" data-aos="fade-up">
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-lg-10">
                <div class="p-4">
                    <div class="text-center mb-4">
                        <h2>Join Our Internship Program</h2>
                        <p style="text-align:center;">Fill out the details below to start your professional journey.</p>
                        
                        <?php if($success): ?>
                            <div class="alert alert-success alert-dismissible fade show">
                                <strong>Success!</strong> <?php echo $success; ?>
                                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                            </div>
                        <?php endif; ?>
                        
                        <?php if(isset($error['db'])): ?>
                            <div class="alert alert-danger"><?php echo $error['db']; ?></div>
                        <?php endif; ?>
                    </div>

                    <div class="box form p-5 mt-2">
                        <form method="post" action="" enctype="multipart/form-data" id="iForm">
                            <div class="row">
                                <div class="col-md-6 mb-3">
                                    <label>Full Name <span class="text-danger">*</span></label>
                                    <input type="text" name="name" class="form-control" placeholder="e.g. Aman Shrivastav" value="<?php echo $_POST['name'] ?? ''; ?>" required />
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Email ID <span class="text-danger">*</span></label>
                                    <input type="email" name="email" id="email" class="form-control <?php echo isset($error['email']) ? 'is-invalid' : ''; ?>" 
                                    placeholder="e.g. aman@example.com" value="<?php echo $_POST['email'] ?? ''; ?>" required />
                                    <?php if(isset($error['email'])) echo "<span class='text-danger'>".$error['email']."</span>"; ?>
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Mobile No. <span class="text-danger">*</span></label>
                                    <input type="text" name="contact" id="contact" class="form-control <?php echo isset($error['contact']) ? 'is-invalid' : ''; ?>" 
                                    placeholder="e.g. 9999999999" value="<?php echo $_POST['contact'] ?? ''; ?>" maxlength="10" required />
                                    <?php if(isset($error['contact'])) echo "<span class='text-danger'>".$error['contact']."</span>"; ?>
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Institute Name <span class="text-danger">*</span></label>
                                    <input type="text" name="institute" class="form-control" placeholder="e.g. IIT Delhi" value="<?php echo $_POST['institute'] ?? ''; ?>" required />
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Current Stream/Degree <span class="text-danger">*</span></label>
                                    <input type="text" name="main_stream" class="form-control" placeholder="e.g. B.Tech (CS)" value="<?php echo $_POST['main_stream'] ?? ''; ?>" required />
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Current Semester <span class="text-danger">*</span></label>
                                    <select name="semester" class="form-control" required>
                                        <option value="">-- Choose Semester --</option>
                                        <?php for($i=1; $i<=8; $i++) { 
                                            $sel = (isset($_POST['semester']) && $_POST['semester'] == $i) ? 'selected' : '';
                                            echo "<option value='$i' $sel>$i Semester</option>";
                                        } ?>
                                    </select>
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Internship Domain <span class="text-danger">*</span></label>
                                    <input type="text" name="intern_stream" class="form-control" placeholder="e.g. Web Development" value="<?php echo $_POST['intern_stream'] ?? ''; ?>" required />
                                </div>

                                <div class="col-md-6 mb-3">
                                    <label>Duration <span class="text-danger">*</span></label>
                                    <select name="tenure" class="form-control" required>
                                        <option value="">-- Select Period --</option>
                                        <option value="1 Month" <?php echo (isset($_POST['tenure']) && $_POST['tenure'] == '1 Month') ? 'selected' : ''; ?>>1 Month</option>
                                        <option value="3 Months" <?php echo (isset($_POST['tenure']) && $_POST['tenure'] == '3 Months') ? 'selected' : ''; ?>>3 Months</option>
                                        <option value="6 Months" <?php echo (isset($_POST['tenure']) && $_POST['tenure'] == '6 Months') ? 'selected' : ''; ?>>6 Months</option>
                                    </select>
                                </div>

                                <div class="col-md-12 mb-3">
                                    <label>About Your Skills <span class="text-danger">*</span></label>
                                    <textarea name="about" class="form-control" rows="3" placeholder="Explain your skills..." required><?php echo $_POST['about'] ?? ''; ?></textarea>
                                </div>

                                <div class="col-md-6 mb-4">
                                    <label>Resume (PDF Only) <span class="text-danger">*</span></label>
                                    <input type="file" name="resume" class="form-control <?php echo isset($error['resume']) ? 'is-invalid' : ''; ?>" accept="application/pdf" required />
                                    <?php if(isset($error['resume'])) echo "<span class='text-danger'>".$error['resume']."</span>"; ?>
                                </div>

                                <div class="col-md-6 mb-4">
                                    <label>Captcha: <?php echo "$num1 + $num2 = ?"; ?> <span class="text-danger">*</span></label>
                                    <input type="hidden" name="captcha_val" value="<?php echo $captcha_ans; ?>">
                                    <input type="number" name="captcha_res" class="form-control <?php echo isset($error['captcha']) ? 'is-invalid' : ''; ?>" placeholder="Sum" required />
                                    <?php if(isset($error['captcha'])) echo "<span class='text-danger'>".$error['captcha']."</span>"; ?>
                                </div>

                                <div class="col-sm-12 text-center">
                                    <button class="btn btn-primary px-5 py-2 shadow-sm" name="intern_submit" type="submit" style="border-radius: 30px;">
                                        Submit Application
                                    </button>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
</section>

<script>
document.getElementById('iForm').addEventListener('input', function(e) {
    if(e.target.id === 'email') {
        const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        e.target.classList.toggle('is-invalid', !regex.test(e.target.value));
    }
    if(e.target.id === 'contact') {
        const regex = /^[0-9]{10}$/;
        e.target.value = e.target.value.replace(/[^0-9]/g, '');
        e.target.classList.toggle('is-invalid', e.target.value.length !== 10);
    }
});
</script>

<?php include("include/footer.php"); ?>