import os
import tempfile
import zipfile
import threading
import uuid
from functools import wraps
from flask import Flask, request, render_template_string, redirect, url_for, session, send_from_directory
from werkzeug.utils import secure_filename
from PyPDF2 import PdfReader
from authlib.integrations.flask_client import OAuth

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = tempfile.mkdtemp()
app.config['MAX_CONTENT_LENGTH'] = 500 * 1024 * 1024  # 500MB limit
app.secret_key = os.getenv('SECRET_KEY', 'dev-secret-key-change-in-production')

# Entra ID Configuration
TENANT_ID = os.getenv('TENANT_ID', 'your-tenant-id')
CLIENT_ID = os.getenv('CLIENT_ID', 'your-client-id')
CLIENT_SECRET = os.getenv('CLIENT_SECRET', 'your-client-secret')

# Admin Configuration
ADMIN_USERNAME = os.getenv('ADMIN_USERNAME', 'trbcit')
ADMIN_PASSWORD = os.getenv('ADMIN_PASSWORD', 'atdrmbicn')

oauth = OAuth(app)
microsoft = oauth.register(
    name='microsoft',
    client_id=CLIENT_ID,
    client_secret=CLIENT_SECRET,
    server_metadata_url=f'https://login.microsoftonline.com/{TENANT_ID}/v2.0/.well-known/openid_configuration',
    client_kwargs={'scope': 'openid profile email'}
)

ALLOWED_EXTENSIONS = {'pdf', 'zip'}

# Global jobs storage (in production, use database)
jobs = {}

def login_required(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if 'user' not in session and 'admin' not in session:
            return redirect(url_for('login'))
        return f(*args, **kwargs)
    return decorated_function

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

def extract_names_from_pdf(pdf_path):
    try:
        reader = PdfReader(pdf_path)
        fields = reader.get_fields()
        last_name = fields.get('Last Name', {}).get('/V', '')
        first_name = fields.get('First Name', {}).get('/V', '')
        if last_name and first_name:
            return f"{last_name}_{first_name}.pdf"
        else:
            return None
    except Exception as e:
        return None

def process_job(job_id, files):
    jobs[job_id]['status'] = 'processing'
    processed_files = []
    temp_extract_dirs = []
    
    for file_info in files:
        filepath = file_info['path']
        filename = file_info['name']
        
        if filename.lower().endswith('.zip'):
            # Extract ZIP
            extract_dir = os.path.join(app.config['UPLOAD_FOLDER'], f'extract_{job_id}_{os.path.splitext(filename)[0]}')
            os.makedirs(extract_dir, exist_ok=True)
            temp_extract_dirs.append(extract_dir)
            with zipfile.ZipFile(filepath, 'r') as zip_ref:
                zip_ref.extractall(extract_dir)
            # Process PDFs in extract_dir
            for root, dirs, files_in_zip in os.walk(extract_dir):
                for f in files_in_zip:
                    if f.lower().endswith('.pdf'):
                        pdf_path = os.path.join(root, f)
                        new_name = extract_names_from_pdf(pdf_path)
                        if new_name:
                            new_path = os.path.join(root, new_name)
                            counter = 1
                            while os.path.exists(new_path):
                                base, ext = os.path.splitext(new_name)
                                new_path = os.path.join(root, f"{base}_{counter}{ext}")
                                counter += 1
                            os.rename(pdf_path, new_path)
                            processed_files.append(('success', os.path.relpath(new_path, extract_dir), new_path))
                        else:
                            processed_files.append(('skipped', f, None))
        else:
            # Single PDF
            new_name = extract_names_from_pdf(filepath)
            if new_name:
                new_filepath = os.path.join(app.config['UPLOAD_FOLDER'], f"{job_id}_{new_name}")
                counter = 1
                while os.path.exists(new_filepath):
                    base, ext = os.path.splitext(new_name)
                    new_filepath = os.path.join(app.config['UPLOAD_FOLDER'], f"{job_id}_{base}_{counter}{ext}")
                    counter += 1
                os.rename(filepath, new_filepath)
                processed_files.append(('success', os.path.basename(new_filepath), new_filepath))
            else:
                processed_files.append(('skipped', filename, None))
    
    # Create ZIP of all successful renames
    successful_files = [p for p in processed_files if p[0] == 'success']
    if successful_files:
        zip_output = os.path.join(app.config['UPLOAD_FOLDER'], f'renamed_{job_id}.zip')
        with zipfile.ZipFile(zip_output, 'w') as zip_out:
            for _, rel_name, full_path in successful_files:
                zip_out.write(full_path, rel_name)
        jobs[job_id]['zip_path'] = zip_output
        jobs[job_id]['zip_name'] = f'renamed_{job_id}.zip'
    
    jobs[job_id]['status'] = 'completed'
    jobs[job_id]['processed_files'] = processed_files
    jobs[job_id]['skipped'] = [p[1] for p in processed_files if p[0] == 'skipped']

@app.route('/login')
def login():
    return render_template_string('''
    <!DOCTYPE html>
    <html>
    <head>
        <title>Login</title>
        <style>
            body { font-family: Arial, sans-serif; background-color: #f4f4f4; margin: 0; padding: 20px; text-align: center; }
            .login-container { background-color: #fff; padding: 30px; border-radius: 10px; box-shadow: 0 0 10px rgba(0,0,0,0.1); display: inline-block; margin: 20px; }
            h1 { color: #333; }
            .login-options { display: flex; justify-content: space-around; flex-wrap: wrap; }
            .login-option { margin: 10px; }
            a { color: #007bff; text-decoration: none; padding: 15px 30px; background-color: #007bff; color: white; border-radius: 5px; display: inline-block; }
            a:hover { background-color: #0056b3; }
            form { margin-top: 20px; }
            input[type="text"], input[type="password"] { padding: 10px; margin: 5px; width: 200px; border: 1px solid #ccc; border-radius: 5px; }
            input[type="submit"] { background-color: #28a745; color: white; border: none; padding: 10px 20px; border-radius: 5px; cursor: pointer; }
            input[type="submit"]:hover { background-color: #218838; }
        </style>
    </head>
    <body>
        <img src="/static/trbc-logo-full.png" alt="Logo" width="200">
        <h1>PDF Renamer Login</h1>
        <div class="login-options">
            <div class="login-option">
                <h2>Microsoft Entra ID</h2>
                <a href="/entra-login">Login with Microsoft</a>
            </div>
            <div class="login-option">
                <h2>Admin Login</h2>
                <form method="post" action="/admin-login">
                    <input type="text" name="username" placeholder="Username" required><br>
                    <input type="password" name="password" placeholder="Password" required><br>
                    <input type="submit" value="Admin Login">
                </form>
            </div>
        </div>
    </body>
    </html>
    ''')

@app.route('/entra-login')
def entra_login():
    redirect_uri = url_for('auth', _external=True)
    return microsoft.authorize_redirect(redirect_uri)

@app.route('/admin-login', methods=['POST'])
def admin_login():
    username = request.form.get('username')
    password = request.form.get('password')
    if username == ADMIN_USERNAME and password == ADMIN_PASSWORD:
        session['admin'] = True
        return redirect(url_for('upload_files'))
    else:
        return render_template_string('''
        <!DOCTYPE html>
        <html>
        <head>
            <title>Login Failed</title>
            <style>
                body { font-family: Arial, sans-serif; background-color: #f4f4f4; text-align: center; padding: 50px; }
                .error { color: #dc3545; background-color: #f8d7da; padding: 20px; border-radius: 5px; border: 1px solid #f5c6cb; }
                a { color: #007bff; text-decoration: none; }
            </style>
        </head>
        <body>
            <div class="error">
                <h1>Login Failed</h1>
                <p>Invalid username or password.</p>
                <a href="/login">Try Again</a>
            </div>
        </body>
        </html>
        ''')

@app.route('/auth')
def auth():
    token = microsoft.authorize_access_token()
    user = microsoft.parse_id_token(token)
    session['user'] = user
    return redirect(url_for('upload_files'))

@app.route('/logout')
@login_required
def logout():
    session.pop('user', None)
    session.pop('admin', None)
    return redirect(url_for('login'))

@app.route('/', methods=['GET', 'POST'])
@login_required
def upload_files():
    if request.method == 'POST':
        files = request.files.getlist('files')
        if not files or all(not f.filename for f in files):
            return redirect(url_for('upload_files'))
        
        job_id = str(uuid.uuid4())
        jobs[job_id] = {
            'status': 'queued',
            'files': [],
            'zip_path': None,
            'zip_name': None,
            'processed_files': [],
            'skipped': []
        }
        
        file_list = []
        for file in files:
            if file and allowed_file(file.filename):
                filename = secure_filename(file.filename)
                filepath = os.path.join(app.config['UPLOAD_FOLDER'], f"{job_id}_{filename}")
                file.save(filepath)
                file_list.append({'name': filename, 'path': filepath})
        
        jobs[job_id]['files'] = file_list
        
        # Start processing in background
        thread = threading.Thread(target=process_job, args=(job_id, file_list))
        thread.daemon = True
        thread.start()
        
        return redirect(url_for('jobs'))
    
    return render_template_string('''
    <!DOCTYPE html>
    <html>
    <head>
        <title>PDF Renamer</title>
        <style>
            body { font-family: Arial, sans-serif; background-color: #f4f4f4; margin: 0; padding: 20px; text-align: center; }
            img { margin-bottom: 20px; }
            h1 { color: #333; }
            form { background-color: #fff; padding: 20px; border-radius: 10px; box-shadow: 0 0 10px rgba(0,0,0,0.1); display: inline-block; }
            input[type="file"] { margin: 10px 0; }
            input[type="submit"] { background-color: #28a745; color: white; border: none; padding: 10px 20px; border-radius: 5px; cursor: pointer; }
            input[type="submit"]:hover { background-color: #218838; }
            .logout { position: absolute; top: 20px; right: 20px; background-color: #dc3545; color: white; text-decoration: none; padding: 10px 20px; border-radius: 5px; }
            .logout:hover { background-color: #c82333; }
            .nav { margin-bottom: 20px; }
            .nav a { margin: 0 10px; color: #007bff; text-decoration: none; }
            .view-jobs-btn { background-color: #007bff; color: white; text-decoration: none; padding: 10px 20px; border-radius: 5px; display: inline-block; margin: 10px 0; }
            .view-jobs-btn:hover { background-color: #0056b3; }
        </style>
    </head>
    <body>
        <a href="/logout" class="logout">Logout</a>
        <div class="nav">
            <a href="/jobs">View Jobs</a>
        </div>
        <img src="/static/trbc-logo-full.png" alt="Logo" width="200">
        <h1>Upload PDF Files or ZIP to Rename</h1>
        <a href="/jobs" class="view-jobs-btn">View Jobs</a>
        <br><br>
        <form method="post" enctype="multipart/form-data">
            <input type="file" name="files" multiple accept=".pdf,.zip">
            <br><br>
            <input type="submit" value="Process PDFs">
        </form>
    </body>
    </html>
    ''')

@app.route('/jobs')
@login_required
def jobs():
    global jobs
    return render_template_string('''
    <!DOCTYPE html>
    <html>
    <head>
        <title>Jobs</title>
        <style>
            body { font-family: Arial, sans-serif; background-color: #f4f4f4; margin: 0; padding: 20px; text-align: center; }
            img { margin-bottom: 20px; }
            h1 { color: #333; }
            .job { background-color: #fff; margin: 10px auto; padding: 15px; border-radius: 10px; box-shadow: 0 0 10px rgba(0,0,0,0.1); max-width: 800px; text-align: left; }
            .status { padding: 5px 10px; border-radius: 5px; color: white; font-weight: bold; }
            .status.queued { background-color: #ffc107; }
            .status.processing { background-color: #17a2b8; }
            .status.completed { background-color: #28a745; }
            .download-btn { background-color: #007bff; color: white; text-decoration: none; padding: 8px 16px; border-radius: 5px; margin-left: 10px; }
            .download-btn:hover { background-color: #0056b3; }
            .logout { position: absolute; top: 20px; right: 20px; background-color: #dc3545; color: white; text-decoration: none; padding: 10px 20px; border-radius: 5px; }
            .logout:hover { background-color: #c82333; }
            .nav { margin-bottom: 20px; }
            .nav a { margin: 0 10px; color: #007bff; text-decoration: none; }
            ul { list-style-type: none; padding: 0; }
            li { background-color: #f8f9fa; margin: 2px 0; padding: 5px; border-radius: 3px; }
        </style>
    </head>
    <body>
        <a href="/logout" class="logout">Logout</a>
        <div class="nav">
            <a href="/">Upload Files</a>
        </div>
        <img src="/static/trbc-logo-full.png" alt="Logo" width="200">
        <h1>Processing Jobs</h1>
        {% for job_id, job in jobs.items() %}
        <div class="job">
            <h3>Job {{ job_id[:8] }}</h3>
            <p><strong>Status:</strong> <span class="status {{ job.status }}">{{ job.status.title() }}</span></p>
            <p><strong>Files:</strong> {{ job.files|length }}</p>
            {% if job.status == 'completed' %}
                {% if job.zip_name %}
                <p><a href="/download/{{ job.zip_name }}" class="download-btn">Download ZIP</a></p>
                {% endif %}
                {% if job.skipped %}
                <p><strong>Skipped Files:</strong></p>
                <ul>
                {% for file in job.skipped %}
                    <li>{{ file }}</li>
                {% endfor %}
                </ul>
                {% endif %}
            {% endif %}
        </div>
        {% endfor %}
        {% if not jobs %}
        <p>No jobs yet. <a href="/">Upload some files</a> to get started.</p>
        {% endif %}
    </body>
    </html>
    ''', jobs=jobs)

if __name__ == '__main__':
    app.run(debug=True, port=3000)