import streamlit as st
import datetime
import uuid
import os

from google_auth_oauthlib.flow import Flow
from googleapiclient.discovery import build
import gspread

# ==========================================================
# CONFIG
# ==========================================================

APP_NAME = "UnreadGbox ✨"
SPREADSHEET_URL = "https://docs.google.com/spreadsheets/d/1j_uDxzWfp2PiZyJXDbFPz5Pa8HLg8zFTuJAYq1XiTDo/edit?usp=drivesdk"
SHEET_NAME = "UnreadGbox"

SCOPES = [
    "openid",
    "https://www.googleapis.com/auth/userinfo.email",
    "https://www.googleapis.com/auth/userinfo.profile",
    "https://www.googleapis.com/auth/gmail.modify",
    "https://www.googleapis.com/auth/spreadsheets",
]

CLIENT_ID = os.environ.get("GOOGLE_CLIENT_ID")
CLIENT_SECRET = os.environ.get("GOOGLE_CLIENT_SECRET")
PROJECT_ID = os.environ.get("GOOGLE_PROJECT_ID")
BASE_URL = os.environ.get("BASE_URL")

# ==========================================================
# PAGE SETUP
# ==========================================================

st.set_page_config(
    page_title="UnreadGbox ✨",
    page_icon="✨",
    layout="centered"
)

st.markdown("# ✨ UnreadGbox")
st.caption("Minimal Gmail Cleanup Tool")
st.divider()

if not CLIENT_ID or not CLIENT_SECRET or not PROJECT_ID or not BASE_URL:
    st.error("Missing Hugging Face Secrets.")
    st.stop()

# ==========================================================
# OAUTH FLOW
# ==========================================================

def create_flow():
    flow = Flow.from_client_config(
        {
            "web": {
                "client_id": CLIENT_ID,
                "project_id": PROJECT_ID,
                "auth_uri": "https://accounts.google.com/o/oauth2/auth",
                "token_uri": "https://oauth2.googleapis.com/token",
                "client_secret": CLIENT_SECRET,
                "redirect_uris": [BASE_URL],
            }
        },
        scopes=SCOPES,
    )
    flow.redirect_uri = BASE_URL
    return flow


def login():
    flow = create_flow()
    auth_url, state = flow.authorization_url(
        access_type="offline",
        include_granted_scopes="true",
        prompt="consent",
    )
    st.session_state["state"] = state
    st.markdown(f"[🔐 Login with Google]({auth_url})")
    st.stop()


def fetch_token():
    if "code" not in st.query_params:
        login()

    flow = create_flow()
    flow.fetch_token(
        code=st.query_params["code"],
        include_client_id=True,
    )

    return flow.credentials


# ==========================================================
# AUTHENTICATION
# ==========================================================

if "credentials" not in st.session_state:
    credentials = fetch_token()
    st.session_state["credentials"] = credentials

creds = st.session_state["credentials"]

# ==========================================================
# BUILD GOOGLE SERVICES
# ==========================================================

gmail_service = build("gmail", "v1", credentials=creds)
gc = gspread.authorize(creds)
sheet = gc.open_by_url(SPREADSHEET_URL).worksheet(SHEET_NAME)

# ==========================================================
# GET USER INFO
# ==========================================================

profile = gmail_service.users().getProfile(userId="me").execute()
user_email = profile.get("emailAddress")

st.success(f"Logged in as: {user_email}")
st.divider()

# ==========================================================
# CLEAN UNREAD EMAILS
# ==========================================================

if st.button("✨ Clean Unread Emails"):

    with st.spinner("Scanning unread emails..."):

        results = gmail_service.users().messages().list(
            userId="me",
            q="is:unread"
        ).execute()

        messages = results.get("messages", [])
        unread_count = len(messages)

        if unread_count == 0:
            st.success("No unread emails 🎉")
        else:
            for msg in messages:
                gmail_service.users().messages().trash(
                    userId="me",
                    id=msg["id"]
                ).execute()

            now = datetime.datetime.now()

            sheet.append_row([
                str(uuid.uuid4()),
                now.strftime("%Y-%m-%d"),
                now.strftime("%H:%M:%S"),
                user_email.split("@")[0],
                user_email,
                unread_count
            ])

            st.success(f"{unread_count} unread emails moved to Trash ✅")

st.divider()
st.caption("UnreadGbox ✨ — Secure Micro SaaS")