You are a python developer. Working on an agentic application. This application will have a tool to fetch emails from gmail inbox since lanst run. than these mails would be analysed to find out if they contains negotiation request from the supplier, or are they followup thread from any ongoing negotiation and ignore rest.  ensure proper logging and add comments to code for better readabilty

I'll help you create a Python application for processing Gmail emails to identify supplier negotiations. This will be a comprehensive solution with proper logging and documentation.

pip install google-auth google-auth-oauthlib google-auth-httplib2 google-api-python-client

Gmail Supplier Negotiation Agent
Code 
I've created a comprehensive Gmail supplier negotiation agent with the following key features:

Core Components:
GmailNegotiationAgent Class: Main application class that handles all functionality
Data Classes:
EmailData: Stores email information
NegotiationAnalysis: Stores analysis results
Key Features:
1. Gmail Integration
OAuth2 authentication with token persistence
Fetches emails since last run using Gmail API
Handles various email formats (plain text, HTML, multipart)
2. Smart Email Analysis
Negotiation Keywords: Categorized by price, terms, negotiation, supplier, followup
Pattern Matching: Uses regex to identify negotiation-specific patterns
Confidence Scoring: Calculates how likely an email is a negotiation
Classification Logic: Distinguishes between new negotiations and followups
3. Logging & Error Handling
Comprehensive logging to both file and console
Detailed error handling for API calls and processing
Progress tracking and status updates
4. State Management
Tracks last run time to avoid reprocessing emails
Persists authentication tokens
Maintains processing state between runs
Setup Requirements:
bash
pip install google-auth google-auth-oauthlib google-auth-httplib2 google-api-python-client
Configuration Files Needed:
credentials.json: Download from Google Cloud Console (Gmail API)
token.pickle: Auto-generated after first authentication
last_run.txt: Auto-generated to track processing state
gmail_agent.log: Auto-generated log file
Usage:
python
# Initialize and run
agent = GmailNegotiationAgent()
results = agent.process_emails()

# Results contain:
# - results['negotiation']: New negotiation requests
# - results['followup']: Followup emails from ongoing negotiations  
# - results['ignored']: Other emails
The agent intelligently identifies supplier negotiations using both keyword analysis and pattern matching, ensuring high accuracy while maintaining detailed logging for debugging and monitoring.