import os

os.environ["KERAS_BACKEND"] = "jax"

import gradio as gr
from gradio import ChatMessage
import keras_hub

from chatstate import ChatState
from models import (
    model_presets,
    load_model,
    model_labels,
    preset_to_website_url,
    get_appropriate_chat_template,
)

model_labels_list = list(model_labels)

# lod a warm up (compile) all the models
models = []
for preset in model_presets:
    model = load_model(preset)
    chat_template = get_appropriate_chat_template(preset)
    chat_state = ChatState(model, "", chat_template)
    prompt, response = chat_state.send_message("Hello")
    print("model " + preset + "loaded and initialized.")
    print("The model responded: " + response)
    models.append(model)

# For local debugging
# model = keras_hub.models.Llama3CausalLM.from_preset(
#     "hf://meta-llama/Llama-3.2-1B-Instruct", dtype="bfloat16"
# )
# models = [model, model]


def chat_turn_assistant_1(
    model,
    message,
    history,
    system_message,
    preset,
    # max_tokens,
    # temperature,
    # top_p,
):
    chat_template = get_appropriate_chat_template(preset)
    chat_state = ChatState(model, system_message, chat_template)

    for msg in history:
        msg = ChatMessage(**msg)
        if msg.role == "user":
            chat_state.add_to_history_as_user(msg.content)
        elif msg.role == "assistant":
            chat_state.add_to_history_as_model(msg.content)

    prompt, response = chat_state.send_message(message)
    history.append(ChatMessage(role="assistant", content=response))
    return history


def chat_turn_assistant(
    message,
    sel1,
    history1,
    sel2,
    history2,
    system_message,
    # max_tokens,
    # temperature,
    # top_p,
):
    history1 = chat_turn_assistant_1(
        models[sel1], message, history1, system_message, model_presets[sel1]
    )
    history2 = chat_turn_assistant_1(
        models[sel2], message, history2, system_message, model_presets[sel2]
    )
    return "", history1, history2


def chat_turn_user_1(message, history):
    history.append(ChatMessage(role="user", content=message))
    return history


def chat_turn_user(message, history1, history2):
    history1 = chat_turn_user_1(message, history1)
    history2 = chat_turn_user_1(message, history2)
    return "", history1, history2


def bot_icon_select(model_name):
    if "gemma" in model_name:
        return "img/gemma.png"
    elif "llama" in model_name:
        return "img/llama.png"
    elif "vicuna" in model_name:
        return "img/vicuna.png"
    elif "mistral" in model_name:
        return "img/mistral.png"
    # default
    return "img/bot.png"


def instantiate_chatbots(sel1, sel2):
    model_name1 = model_presets[sel1]
    chatbot1 = gr.Chatbot(
        type="messages",
        show_label=False,
        avatar_images=("img/usr.png", bot_icon_select(model_name1)),
    )
    model_name2 = model_presets[sel2]
    chatbot2 = gr.Chatbot(
        type="messages",
        show_label=False,
        avatar_images=("img/usr.png", bot_icon_select(model_name2)),
    )
    return chatbot1, chatbot2


def instantiate_select_boxes(sel1, sel2, model_labels):
    sel1 = gr.Dropdown(
        choices=[(name, i) for i, name in enumerate(model_labels)],
        show_label=False,
        info="<span style='color:black'>Selected model 1:</span> "
        + "<a href='"
        + preset_to_website_url(model_presets[sel1])
        + "'>"
        + preset_to_website_url(model_presets[sel1])
        + "</a>",
        value=sel1,
    )
    sel2 = gr.Dropdown(
        choices=[(name, i) for i, name in enumerate(model_labels)],
        show_label=False,
        info="<span style='color:black'>Selected model 2:</span> "
        + "<a href='"
        + preset_to_website_url(model_presets[sel2])
        + "'>"
        + preset_to_website_url(model_presets[sel2])
        + "</a>",
        value=sel2,
    )
    return sel1, sel2


def instantiate_chatbots_and_select_boxes(sel1, sel2, model_labels):
    chatbot1, chatbot2 = instantiate_chatbots(sel1, sel2)
    sel1, sel2 = instantiate_select_boxes(sel1, sel2, model_labels)
    return sel1, chatbot1, sel2, chatbot2


with gr.Blocks(fill_width=True, title="Keras demo") as demo:

    with gr.Row():
        gr.Image(
            "img/keras_logo_k.png",
            width=80,
            height=80,
            min_width=80,
            show_label=False,
            show_download_button=False,
            show_fullscreen_button=False,
            interactive=False,
            scale=0.01,
            container=False,
        )
        gr.HTML(
            "<H2> Battle of the Keras chatbots on TPU</H2>"
            + "All the models are loaded into the TPU memory. "
            + "You can call them at will and compare their answers. <br/>"
            + "The entire chat history is fed to the models at every submission."
            + "This demno is runnig on a Google TPU v5e 2x4 (8 cores).",
        )
    with gr.Row():
        sel1, sel2 = instantiate_select_boxes(0, 1, model_labels_list)

    with gr.Row():
        chatbot1, chatbot2 = instantiate_chatbots(sel1.value, sel2.value)

    msg = gr.Textbox(
        label="Your message:",
    )
    with gr.Row():
        gr.ClearButton([msg, chatbot1, chatbot2])
        with gr.Accordion("Additional settings", open=False):
            system_message = gr.Textbox(
                label="Sytem prompt",
                value="You are a helpful assistant and your name is Eliza.",
            )

    sel1.select(
        lambda sel1, sel2: instantiate_chatbots_and_select_boxes(
            sel1, sel2, model_labels_list
        ),
        inputs=[sel1, sel2],
        outputs=[sel1, chatbot1, sel2, chatbot2],
    )

    sel2.select(
        lambda sel1, sel2: instantiate_chatbots_and_select_boxes(
            sel1, sel2, model_labels_list
        ),
        inputs=[sel1, sel2],
        outputs=[sel1, chatbot1, sel2, chatbot2],
    )

    msg.submit(
        chat_turn_user,
        inputs=[msg, chatbot1, chatbot2],
        outputs=[msg, chatbot1, chatbot2],
    ).then(
        chat_turn_assistant,
        [msg, sel1, chatbot1, sel2, chatbot2, system_message],
        outputs=[msg, chatbot1, chatbot2],
    )


if __name__ == "__main__":
    demo.launch()