#!/bin/bash

# Fully Automated Header Modifier for Chrome (Ubuntu x86)
# Creates a custom Chrome extension to modify User-Agent and Sec-Ch-Ua-Platform
# No manual steps required!

set -e

PROFILE_DIR="$HOME/.config/google-chrome-headers"
EXTENSION_DIR="$PROFILE_DIR/HeaderModifier"

echo "================================================"
echo "Automated Header Modifier Setup for Chrome"
echo "================================================"
echo ""

# Install Google Chrome if not present
echo "[1/3] Checking for Google Chrome..."
if ! command -v google-chrome &> /dev/null; then
    echo "Installing Google Chrome..."
    wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
    sudo sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
    sudo apt-get update
    sudo apt-get install -y google-chrome-stable
    echo "✓ Chrome installed"
else
    echo "✓ Chrome already installed"
fi

# Create extension directory
echo ""
echo "[2/3] Creating header modifier extension..."
rm -rf "$EXTENSION_DIR"
mkdir -p "$EXTENSION_DIR"

# Create manifest.json
cat > "$EXTENSION_DIR/manifest.json" << 'EOF'
{
  "manifest_version": 3,
  "name": "Header Modifier",
  "version": "1.0.0",
  "description": "Automatically modifies User-Agent and Sec-Ch-Ua-Platform headers",
  "permissions": [
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "declarative_net_request": {
    "rule_resources": [{
      "id": "ruleset_1",
      "enabled": true,
      "path": "rules.json"
    }]
  },
  "background": {
    "service_worker": "background.js"
  }
}
EOF

# Create rules.json for declarativeNetRequest
cat > "$EXTENSION_DIR/rules.json" << 'EOF'
[
  {
    "id": 1,
    "priority": 1,
    "action": {
      "type": "modifyHeaders",
      "requestHeaders": [
        {
          "header": "User-Agent",
          "operation": "set",
          "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36"
        },
        {
          "header": "Sec-Ch-Ua-Platform",
          "operation": "set",
          "value": "\"macOS\""
        },
        {
          "header": "Sec-Ch-Ua",
          "operation": "set",
          "value": "Not(A:Brand\";v=\"8\", \"Chromium\";v=\"144\", \"Google Chrome\";v=\"144\""
        }
      ]
    },
    "condition": {
      "urlFilter": "*",
      "resourceTypes": [
        "main_frame",
        "sub_frame",
        "stylesheet",
        "script",
        "image",
        "font",
        "object",
        "xmlhttprequest",
        "ping",
        "csp_report",
        "media",
        "websocket",
        "other"
      ]
    }
  }
]
EOF

# Create background.js
cat > "$EXTENSION_DIR/background.js" << 'EOF'
// Background service worker for Header Modifier
console.log('Header Modifier extension loaded');

// Listen for extension installation
chrome.runtime.onInstalled.addListener(() => {
  console.log('Header Modifier installed and active');
  console.log('User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36');
  console.log('Sec-Ch-Ua-Platform: "macOS"');
});
EOF

echo "✓ Extension created at $EXTENSION_DIR"

# Create Chrome preferences to suppress popups
echo ""
echo "[3/4] Configuring Chrome preferences..."
mkdir -p "$PROFILE_DIR/Default"

cat > "$PROFILE_DIR/Default/Preferences" << 'PREFEOF'
{
  "browser": {
    "show_home_button": true,
    "check_default_browser": false
  },
  "profile": {
    "default_content_setting_values": {
      "notifications": 2
    },
    "password_manager_enabled": false,
    "name": "HeaderModifier"
  },
  "upgrade": {
    "last_check_status": 0,
    "last_check_time": "13317768000000000"
  },
  "distribution": {
    "skip_first_run_ui": true,
    "show_welcome_page": false,
    "import_search_engine": false,
    "import_history": false,
    "do_not_create_any_shortcuts": true,
    "do_not_create_desktop_shortcut": true,
    "do_not_create_quick_launch_shortcut": true,
    "do_not_create_taskbar_shortcut": true,
    "do_not_launch_chrome": true,
    "do_not_register_for_update_launch": true,
    "make_chrome_default": false,
    "make_chrome_default_for_user": false,
    "suppress_first_run_default_browser_prompt": true
  },
  "first_run_tabs": [],
  "sync_promo": {
    "show_on_first_run_allowed": false
  },
  "privacy_sandbox": {
    "m1": {
      "topics_enabled": false,
      "fledge_enabled": false
    },
    "notice_displayed": true,
    "consent_decision_made": true,
    "topics_consent": {
      "consent_given": false
    }
  }
}
PREFEOF

cat > "$PROFILE_DIR/First Run" << 'EOF'
EOF

cat > "$PROFILE_DIR/First Run Dev" << 'EOF'
EOF

echo "✓ Preferences configured"

# Create launcher script
echo ""
echo "[4/4] Creating launcher script..."
LAUNCH_SCRIPT="$HOME/launch-chrome-with-headers-hijack.sh"
cat > "$LAUNCH_SCRIPT" << EOF
#!/bin/bash
nohup google-chrome \\
  --user-data-dir="$PROFILE_DIR" \\
  --load-extension="$EXTENSION_DIR" \\
  --disable-extensions-except="$EXTENSION_DIR" \\
  --no-first-run \\
  --no-default-browser-check \\
  --disable-default-apps \\
  --disable-popup-blocking \\
  --disable-translate \\
  --disable-sync \\
  --no-service-autorun \\
  --simulate-outdated-no-au='Tue, 31 Dec 2099 23:59:59 GMT' \\
  --disable-component-update \\
  "\$@" > /dev/null 2>&1 &
EOF
chmod +x "$LAUNCH_SCRIPT"

# Build a new chrome shortcut and replace the one on dock
echo "Updating the shortcut on Dock"
mkdir -p ~/.local/share/applications
cp /usr/share/applications/google-chrome.desktop ~/.local/share/applications/
sed -i "s|/usr/bin/google-chrome-stable|$LAUNCH_SCRIPT|g" ~/.local/share/applications/google-chrome.desktop
update-desktop-database ~/.local/share/applications

NEW_DESKTOP_FILE="$HOME/.local/share/applications/chrome-custom.desktop"
cat > "$NEW_DESKTOP_FILE" << EOF
[Desktop Entry]
Version=1.0
Name=Chrome (Header Mod)
Exec=/usr/bin/google-chrome-stable --user-data-dir="$PROFILE_DIR" --load-extension="$EXTENSION_DIR" --no-first-run %U
Terminal=false
Icon=google-chrome
Type=Application
Categories=Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;
StartupWMClass=google-chrome
EOF
chmod +x "$NEW_DESKTOP_FILE"

CURRENT_FAVORITES=$(gsettings get org.gnome.shell favorite-apps)

if [[ $CURRENT_FAVORITES != *"'chrome-custom.desktop'"* ]]; then
    NEW_FAVORITES=$(echo $CURRENT_FAVORITES | sed "s/'google-chrome.desktop'//g" | sed "s/\[/['chrome-custom.desktop', /g" | sed "s/, ,/, /g" | sed "s/, \]/]/g")
    gsettings set org.gnome.shell favorite-apps "$NEW_FAVORITES"
    echo "✓ Updated"
else
    echo "✓ Already the newest version"
fi
sleep 5