#!/usr/bin/env python3
# ABOUTME: PhaseFlow Garmin Token Generator using garth library.
# ABOUTME: Run this locally to authenticate with Garmin (supports MFA).
"""
PhaseFlow Garmin Token Generator
Run this locally to authenticate with Garmin (supports MFA)

Usage:
    pip install garth
    python3 garmin_auth.py
"""
import json
import sys
from datetime import datetime
from getpass import getpass

try:
    import garth
    from garth.auth_tokens import OAuth1Token, OAuth2Token
    from garth.exc import GarthHTTPError
    from pydantic import TypeAdapter
except ImportError:
    print("Error: garth library not installed.")
    print("Please install it with: pip install garth")
    exit(1)

email = input("Garmin email: ")
password = getpass("Garmin password: ")

# MFA handled automatically - prompts if needed
try:
    garth.login(email, password)
except GarthHTTPError as e:
    if "401" in str(e):
        print("\nError: Invalid email or password.", file=sys.stderr)
    else:
        print(f"\nError: Authentication failed - {e}", file=sys.stderr)
    exit(1)
except Exception as e:
    print(f"\nError: {e}", file=sys.stderr)
    exit(1)

# Serialize Pydantic dataclasses using TypeAdapter
oauth1_adapter = TypeAdapter(OAuth1Token)
oauth2_adapter = TypeAdapter(OAuth2Token)

expires_at_ts = garth.client.oauth2_token.expires_at
tokens = {
    "oauth1": oauth1_adapter.dump_python(garth.client.oauth1_token, mode='json'),
    "oauth2": oauth2_adapter.dump_python(garth.client.oauth2_token, mode='json'),
    "expires_at": datetime.fromtimestamp(expires_at_ts).isoformat()
}

print("\n--- Copy everything below this line ---")
print(json.dumps(tokens, indent=2))
print("--- Copy everything above this line ---")
print(f"\nTokens expire: {tokens['expires_at']}")