from google.adk.tools.tool_context import ToolContext
import datetime

def update_customer_profile(field: str, value: str, tool_context: ToolContext) -> dict:
    """Updates a customer's profile information.

    Args:
        field: Profile field to update.
        value: New value.
        tool_context: Provided by ADK.
    Returns:
        dict: Success status and summary.
    """
    try:
        profile_key = "user:customer_profile"
        profile = tool_context.state.get(profile_key, {})
        if "update_history" not in profile:
            profile["update_history"] = []
        old_value = profile.get(field)
        profile[field] = value
        profile["update_history"].append({
            "field": field,
            "old_value": old_value,
            "new_value": value,
            "timestamp": datetime.datetime.now().isoformat()
        })
        tool_context.state[profile_key] = profile
        return {
            "status": "success",
            "message": f"Updated {field} to '{value}'",
            "profile_summary": {k: v for k, v in profile.items() if k != "update_history"}
        }
    except Exception as e:
        return {
            "status": "error",
            "error_message": f"Failed to update profile: {str(e)}"
        }

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