import torch
import torch.nn as nn
import torch.nn.functional as F
import random
from textblob import TextBlob
import pandas as pd
import requests
from io import StringIO
import gradio as gr
import speech_recognition as sr
import json

# ----- Dummy Model and vocab -----
vocab = {'<PAD>': 0, '<UNK>': 1, 'i': 2, 'am': 3, 'feeling': 4, 'sad': 5, 'happy': 6, 'angry': 7, 'love': 8, 'stressed': 9, 'anxious': 10}
MAX_LEN = 16

class DummyLabelEncoder:
    def __init__(self):
        self.classes_ = ['sadness', 'anger', 'love', 'happiness', 'neutral']
    def transform(self, x): return [self.classes_.index(i) for i in x]
    def inverse_transform(self, x): return [self.classes_[i] for i in x]

le = DummyLabelEncoder()

class DummyModel(nn.Module):
    def __init__(self):
        super().__init__()
        self.embedding = nn.Embedding(len(vocab), 8)
        self.fc = nn.Linear(8, len(le.classes_))
    def forward(self, x):
        x = self.embedding(x)
        x = x.mean(dim=1)
        return self.fc(x)

model = DummyModel()

def preprocess_input(text):
    tokens = text.lower().split()
    encoded = [vocab.get(token, vocab['<UNK>']) for token in tokens]
    padded = encoded[:MAX_LEN] + [vocab['<PAD>']] * max(0, MAX_LEN - len(encoded))
    return torch.tensor([padded], dtype=torch.long).to(next(model.parameters()).device)

# ----- Load CSV from Google Drive -----
file_id = "1yVJh_NVL4Y4YqEXGym47UCK5ZNZgVZYv"
url = f"https://drive.google.com/uc?export=download&id={file_id}"
response = requests.get(url)
csv_text = response.text

if csv_text.strip().startswith('<'):
    raise Exception("ERROR: Google Drive link is not returning CSV! Check your sharing settings.")

solutions_df = pd.read_csv(StringIO(csv_text), header=0, on_bad_lines='skip')

used_solutions = {emotion: set() for emotion in solutions_df['emotion'].unique()}

# ----- Data and responses -----
negative_words = [
    "not", "bad", "sad", "anxious", "anxiety", "depressed", "upset", "shit", "stress",
    "worried", "unwell", "struggling", "low", "down", "terrible", "awful",
    "nervous", "panic", "afraid", "scared", "tense", "overwhelmed", "fear", "uneasy"
]

responses = {
    "sadness": [
        "It’s okay to feel down sometimes. I’m here to support you.",
        "I'm really sorry you're going through this. Want to talk more about it?",
        "You're not alone — I’m here for you."
    ],
    "anger": [
        "That must have been frustrating. Want to vent about it?",
        "It's okay to feel this way. I'm listening.",
        "Would it help to talk through it?"
    ],
    "love": [
        "That’s beautiful to hear! What made you feel that way?",
        "It’s amazing to experience moments like that.",
        "Sounds like something truly meaningful."
    ],
    "happiness": [
        "That's awesome! What’s bringing you joy today?",
        "I love hearing good news. 😊",
        "Yay! Want to share more about it?"
    ],
    "neutral": [
        "Got it. I’m here if you want to dive deeper.",
        "Thanks for sharing that. Tell me more if you’d like.",
        "I’m listening. How else can I support you?"
    ]
}

# --- Helper functions ---

def correct_spelling(text):
    return str(TextBlob(text).correct())

def get_sentiment(text):
    return TextBlob(text).sentiment.polarity

def is_negative_input(text):
    text_lower = text.lower()
    return any(word in text_lower for word in negative_words)

def get_unique_solution(emotion):
    available = solutions_df[solutions_df['emotion'] == emotion]
    unused = available[~available['solution'].isin(used_solutions[emotion])]
    if unused.empty:
        used_solutions[emotion] = set()
        unused = available
    solution_row = unused.sample(1).iloc[0]
    used_solutions[emotion].add(solution_row['solution'])
    return solution_row['solution']

def get_emotion(user_input):
    if is_negative_input(user_input):
        return "sadness"
    sentiment = get_sentiment(user_input)
    x = preprocess_input(user_input)
    model.train()
    with torch.no_grad():
        probs = torch.stack([F.softmax(model(x), dim=1) for _ in range(5)])
        avg_probs = probs.mean(dim=0)
        prob, idx = torch.max(avg_probs, dim=1)
    pred_emotion = le.classes_[idx.item()]
    if prob.item() < 0.6:
        return "neutral"
    if sentiment < -0.25 and pred_emotion == "happiness":
        return "sadness"
    if sentiment > 0.25 and pred_emotion == "sadness":
        return "happiness"
    return pred_emotion

def audio_to_text(audio_file):
    if audio_file is None:
        return ""
    recog = sr.Recognizer()
    with sr.AudioFile(audio_file) as source:
        audio = recog.record(source)
    try:
        text = recog.recognize_google(audio)
        return text
    except Exception:
        return ""

# ----- Chat function -----
GLOBAL_CONVO_HISTORY = []
USER_FEEDBACK_STATE = {}

def emoti_chat(audio, text, history_json=""):
    if text and text.strip():
        user_input = text
    elif audio is not None:
        user_input = audio_to_text(audio)
    else:
        user_input = ""
    if not user_input.strip():
        return "Please say something or type your message.", json.dumps(GLOBAL_CONVO_HISTORY[-5:], indent=2), ""

    user_input = correct_spelling(user_input)

    exit_phrases = ["exit", "quit", "goodbye", "bye", "close"]
    if user_input.lower().strip() in exit_phrases:
        return "Take care! I’m here whenever you want to talk. 👋", json.dumps(GLOBAL_CONVO_HISTORY[-5:], indent=2), gr.update(visible=False)

    user_id = "default_user"
    state = USER_FEEDBACK_STATE.get(user_id, {"emotion": None, "pending": False})

    if state["pending"]:
        feedback = user_input.lower().strip()
        GLOBAL_CONVO_HISTORY[-1]["feedback"] = feedback
        if feedback == "no":
            suggestion = get_unique_solution(state["emotion"])
            reply = f"Here's another suggestion for you: {suggestion}\nDid this help? (yes/no/skip)"
            USER_FEEDBACK_STATE[user_id]["pending"] = True
            return reply, json.dumps(GLOBAL_CONVO_HISTORY[-5:], indent=2), ""
        else:
            USER_FEEDBACK_STATE[user_id] = {"emotion": None, "pending": False}
            return "How can I help you further?", json.dumps(GLOBAL_CONVO_HISTORY[-5:], indent=2), ""

    pred_emotion = get_emotion(user_input)
    support = random.choice(responses.get(pred_emotion, responses["neutral"]))
    try:
        suggestion = get_unique_solution(pred_emotion)
    except Exception:
        suggestion = get_unique_solution("neutral")

    reply = f"{support}\n\nHere's a suggestion for you: {suggestion}\nDid this help? (yes/no/skip)"
    GLOBAL_CONVO_HISTORY.append({
        "user_input": user_input,
        "emotion": pred_emotion,
        "bot_support": support,
        "bot_suggestion": suggestion,
        "feedback": ""
    })
    USER_FEEDBACK_STATE[user_id] = {"emotion": pred_emotion, "pending": True}
    return reply, json.dumps(GLOBAL_CONVO_HISTORY[-5:], indent=2), ""

# ---- Gradio interface ----
iface = gr.Interface(
    fn=emoti_chat,
    inputs=[
        gr.Audio(type="filepath", label="🎤 Speak your message"),
        gr.Textbox(lines=2, placeholder="Or type your message here...", label="💬 Type message"),
        gr.Textbox(lines=1, value="", visible=False)  # hidden, history state
    ],
    outputs=[
        gr.Textbox(label="EmotiBot Reply"),
        gr.Textbox(label="Hidden", visible=False)
    ],
    title="EmotiBot Connect",
    description="Talk to EmotiBot using your voice or by typing. Detects your emotion, gives dynamic suggestions, remembers your feedback, and keeps a conversation history! Type 'exit' to leave."
)

if __name__ == "__main__":
    iface.launch(debug=True)