import streamlit as st
import json
import os
import subprocess
import time
import pandas as pd
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

st.set_page_config(layout="wide")

# Paths
SALES_SCRIPT_FILE = 'sales_script.txt'
NUMBERS_FILE = 'numbers.txt'
LOG_DIR = 'call_logs'
APP_DATA_DIR = 'application_data'
WEBHOOK_SERVER_FILE = 'webhook_server.py'

# --- Helper Functions ---
def load_sales_script():
    if os.path.exists(SALES_SCRIPT_FILE):
        with open(SALES_SCRIPT_FILE, 'r') as f:
            return f.read()
    return ""

def save_sales_script(script):
    with open(SALES_SCRIPT_FILE, 'w') as f:
        f.write(script)

def load_numbers():
    if os.path.exists(NUMBERS_FILE):
        with open(NUMBERS_FILE, 'r') as f:
            return [line.strip() for line in f.readlines()]
    return []

def save_numbers(numbers):
    with open(NUMBERS_FILE, 'w') as f:
        f.write('\n'.join(numbers))

@st.cache_data
def get_application_data():
    data = []
    if os.path.exists(APP_DATA_DIR):
        for filename in os.listdir(APP_DATA_DIR):
            if filename.endswith(".json"):
                with open(os.path.join(APP_DATA_DIR, filename), 'r') as f:
                    call_data = json.load(f)
                    call_data['call_sid'] = filename.replace('.json', '')
                    data.append(call_data)
    return pd.DataFrame(data)

# --- UI ---
st.title("AI Sales Calling Agent")

# --- Sales Script ---
with st.expander("Sales Script"):
    sales_script = st.text_area("Edit Sales Script", value=load_sales_script(), height=200)
    if st.button("Save Script"):
        save_sales_script(sales_script)
        st.success("Sales script saved!")

# --- Numbers ---
with st.expander("Manage Numbers"):
    numbers = st.text_area("Enter numbers to call (one per line)", value='\n'.join(load_numbers()), height=150)
    if st.button("Save Numbers"):
        save_numbers(numbers.split('\n'))
        st.success("Numbers saved!")

def get_huggingface_url():
    hf_space_id = os.environ.get("HF_SPACE_ID")
    if hf_space_id:
        return f"https://{hf_space_id.replace('/', '-')}.hf.space"
    return None

# --- Call Control ---
with st.expander("Call Control"):
    st.info("When running on Hugging Face Spaces, the webhook server will start automatically.")

    if os.environ.get("HF_SPACE_ID") and not hasattr(st, 'webhook_process'):
        try:
            st.webhook_process = subprocess.Popen(["python", WEBHOOK_SERVER_FILE])
            st.success("Webhook server started automatically on Hugging Face Space.")
        except Exception as e:
            st.error(f"Error starting webhook server: {e}")

    webhook_url = get_huggingface_url()
    if webhook_url:
        st.success(f"Webhook URL detected: {webhook_url}")
    else:
        st.warning("Could not determine Hugging Face URL. Please run this in a Hugging Face Space.")

    number_to_call = st.selectbox("Select number to call", load_numbers())
    if st.button("Initiate Call"):
        if webhook_url:
            try:
                from twilio.rest import Client
                client = Client(os.environ.get('TWILIO_ACCOUNT_SID'), os.environ.get('TWILIO_AUTH_TOKEN'))
                call = client.calls.create(
                    to=number_to_call,
                    from_=os.environ.get('TWILIO_PHONE_NUMBER'),
                    url=f"{webhook_url}",
                    status_callback=f"{webhook_url}/status",
                    status_callback_method="POST",
                    status_callback_event=['completed']
                )
                st.success(f"Call initiated to {number_to_call} (SID: {call.sid})")
            except Exception as e:
                st.error(f"Error initiating call: {e}")
        else:
            st.error("Webhook URL is not set. Cannot initiate call.")

# --- Real-time Logs & Data ---
st.header("Live Call Status")
log_placeholder = st.empty()

class LogHandler(FileSystemEventHandler):
    def on_modified(self, event):
        if not event.is_directory and event.src_path.endswith(".log"):
            with open(event.src_path, "r") as f:
                log_placeholder.text_area("Logs", f.read(), height=300)

if not os.path.exists(LOG_DIR):
    os.makedirs(LOG_DIR)

observer = Observer()
observer.schedule(LogHandler(), LOG_DIR, recursive=True)
observer.start()

# --- Application Data ---
st.header("Extracted Application Data")
df = get_application_data()
if not df.empty:
    st.dataframe(df)
    csv = df.to_csv(index=False).encode('utf-8')
    st.download_button(
        label="Download Application Data as CSV",
        data=csv,
        file_name='application_data.csv',
        mime='text/csv',
    )
else:
    st.info("No application data found.")