import streamlit as st
import SessionState
from mtranslate import translate
from prompts import PROMPT_LIST
import random
import time
from transformers import pipeline, set_seed

# st.set_page_config(page_title="Image Search")

# vector_length = 128
model_name = "cahya/gpt2-small-indonesian-story"


@st.cache(suppress_st_warning=True, allow_output_mutation=True)
def get_generator():
    st.write(f"Loading the GPT2 model {model_name}, please wait...")
    text_generator = pipeline('text-generation', model=model_name)
    return text_generator


#@st.cache(suppress_st_warning=True)
def process(text: str, max_length: int = 100, do_sample: bool = True, top_k: int = 50, top_p: float = 0.95,
            temperature: float = 1.0, max_time: float = None, seed=42):
    # st.write("Cache miss: process")
    set_seed(seed)
    result = text_generator(text, max_length=max_length, do_sample=do_sample,
                            top_k=top_k, top_p=top_p, temperature=temperature, max_time=max_time)
    return result


st.title("Indonesian Story Generator")

st.markdown(
    """
    This application is a demo for Indonesian Story Generator using GPT2.
    """
)
session_state = SessionState.get(prompt=None, prompt_box=None, text=None)
ALL_PROMPTS = list(PROMPT_LIST.keys())+["Custom"]
prompt = st.selectbox('Prompt', ALL_PROMPTS, index=len(ALL_PROMPTS)-1)
# Update prompt
if session_state.prompt is None:
    session_state.prompt = prompt
elif session_state.prompt is not None and (prompt != session_state.prompt):
    session_state.prompt = prompt
    session_state.prompt_box = None
    session_state.text = None
else:
    session_state.prompt = prompt

# Update prompt box
if session_state.prompt == "Custom":
    session_state.prompt_box = "Enter your text here"
else:
    if session_state.prompt is not None and session_state.prompt_box is None:
        session_state.prompt_box = random.choice(PROMPT_LIST[session_state.prompt])

session_state.text = st.text_area("Enter text", session_state.prompt_box)

max_length = st.sidebar.number_input(
    "Maximum length",
    value=100,
    max_value=512,
    help="The maximum length of the sequence to be generated."
)

temp = st.sidebar.slider(
    "Temperature",
    value=1.0,
    min_value=0.0,
    max_value=100.0
)

top_k = st.sidebar.number_input(
    "Top k",
    value=25
)

top_p = st.sidebar.number_input(
    "Top p",
    value=0.95
)

text_generator = get_generator()
if st.button("Run"):
    with st.spinner(text="Getting results..."):
        st.subheader("Result")
        time_start = time.time()
        result = process(text=session_state.text, max_length=int(max_length), top_k=int(top_k), top_p=float(top_p))
        time_end = time.time()
        time_diff = time_end-time_start
        #print(f"Text generated in {time_diff} seconds")
        result = result[0]["generated_text"]
        st.write(result.replace("\n", "  \n"))
        st.text("Translation")
        translation = translate(result, "en", "id")
        st.write(translation.replace("\n", "  \n"))

        # Reset state
        session_state.prompt = None
        session_state.prompt_box = None
        session_state.text = None