import os
import io
import base64
import subprocess
import re
import platform
from flask import Flask, render_template, request, jsonify, send_file
import segno
from segno import helpers
from PIL import Image

app = Flask(__name__)
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024  # 16MB max upload

def get_current_wifi_ssid():
    """
    Attempt to get the current connected WiFi SSID.
    Works primarily on macOS for local development.
    Returns None if detection fails or running in cloud.
    """
    try:
        system = platform.system()
        if system == 'Darwin':  # macOS
            process = subprocess.Popen(
                ['/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport', '-I'],
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE
            )
            out, err = process.communicate()
            if process.returncode == 0:
                output = out.decode('utf-8')
                match = re.search(r' SSID: (.+)', output)
                if match:
                    return match.group(1).strip()
        elif system == 'Linux':
            # Basic attempt for Linux (might work if nmcli is installed and has permissions)
            # Unlikely to work in Docker/HF Spaces without host networking
            pass
    except Exception as e:
        print(f"WiFi detection failed: {e}")
    return None

def hex_to_rgb(hex_color):
    hex_color = hex_color.lstrip('#')
    return tuple(int(hex_color[i:i+2], 16) for i in (0, 2, 4))

@app.route('/')
def index():
    default_ssid = get_current_wifi_ssid() or ''
    return render_template('index.html', default_ssid=default_ssid)

@app.route('/api/generate', methods=['POST'])
def generate_qr():
    try:
        data = request.form
        qr_type = data.get('type', 'text')
        content = data.get('content', '')
        fg_color = data.get('fg_color', '#000000')
        bg_color = data.get('bg_color', '#ffffff')
        scale = int(data.get('scale', 10))
        border = int(data.get('border', 4))
        
        # Handle colors (Segno expects hex or RGB tuple, but let's be safe)
        # Segno handles hex strings well.
        
        qr = None
        
        # 1. Generate QR Object
        if qr_type == 'wifi':
            ssid = data.get('wifi_ssid')
            password = data.get('wifi_password')
            security = data.get('wifi_security', 'WPA')
            hidden = data.get('wifi_hidden') == 'true'
            qr = helpers.make_wifi(ssid=ssid, password=password, security=security, hidden=hidden)
        elif qr_type == 'vcard':
            name = data.get('vcard_name')
            displayname = data.get('vcard_displayname')
            email = data.get('vcard_email')
            phone = data.get('vcard_phone')
            url = data.get('vcard_url')
            # Segno make_vcard is powerful
            qr = helpers.make_vcard(name=name, displayname=displayname, email=email, phone=phone, url=url)
        else:
            # Default text/url
            if not content:
                return jsonify({'error': '内容不能为空'}), 400
            qr = segno.make(content, error='h') # High error correction for logos

        # 2. Convert to PIL Image
        out = io.BytesIO()
        qr.save(out, kind='png', scale=scale, border=border, dark=fg_color, light=bg_color)
        out.seek(0)
        img = Image.open(out).convert("RGBA")
        
        # 3. Handle Logo
        logo_file = request.files.get('logo')
        if logo_file:
            logo = Image.open(logo_file).convert("RGBA")
            
            # Calculate logo size (e.g., 20% of QR width)
            qr_width, qr_height = img.size
            logo_max_size = int(qr_width * 0.25) # 25% coverage max
            
            # Resize logo maintaining aspect ratio
            logo.thumbnail((logo_max_size, logo_max_size), Image.Resampling.LANCZOS)
            
            # Position centered
            logo_pos = ((qr_width - logo.size[0]) // 2, (qr_height - logo.size[1]) // 2)
            
            # Paste logo (with transparency support)
            # Create a white background for logo if needed or just paste
            # Usually better to have a small white border around logo for readability
            # Let's create a white backing for the logo
            logo_bg_size = (logo.size[0] + 4, logo.size[1] + 4) # 4px padding
            logo_bg = Image.new('RGBA', logo_bg_size, bg_color)
            logo_bg_pos = (logo_pos[0] - 2, logo_pos[1] - 2)
            
            img.paste(logo_bg, logo_bg_pos, logo_bg) # Paste white square
            img.paste(logo, logo_pos, logo) # Paste logo
            
        # 4. Return as Base64
        final_out = io.BytesIO()
        img.save(final_out, format='PNG')
        final_out.seek(0)
        b64_data = base64.b64encode(final_out.getvalue()).decode()
        
        return jsonify({
            'image': f'data:image/png;base64,{b64_data}',
            'filename': 'qrcode.png'
        })

    except Exception as e:
        print(f"Error: {e}")
        return jsonify({'error': str(e)}), 500

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860, debug=True)