import gradio as gr
import numpy as np
import tempfile
import imageio
import torch
from transformers import pipeline
from diffusers import DiffusionPipeline

# ---------- Settings ----------
AVAILABLE_MODELS = {
    "GPT-2 (small, fast)": "gpt2",
    "Falcon (TII UAE)": "tiiuae/falcon-7b-instruct",
    "Mistral (OpenAccess)": "mistralai/Mistral-7B-v0.1"
}

device = "cuda" if torch.cuda.is_available() else "cpu"
text_model_cache = {}
chat_memory = {}

# ---------- Load Optional Models ----------
try:
    image_generator = DiffusionPipeline.from_pretrained("runwayml/stable-diffusion-v1-5", torch_dtype=torch.float16 if device == "cuda" else torch.float32)
    image_generator.to(device)
    image_enabled = True
except Exception as e:
    print(f"[Image Load Error]: {e}")
    image_generator = None
    image_enabled = False

try:
    video_pipeline = DiffusionPipeline.from_pretrained("damo-vilab/text-to-video-ms-1.7b", torch_dtype=torch.float16 if device == "cuda" else torch.float32)
    video_pipeline.to(device)
    video_enabled = True
except Exception as e:
    print(f"[Video Load Error]: {e}")
    video_pipeline = None
    video_enabled = False

# ---------- Core Logic ----------
def codette_terminal(prompt, model_name, generate_image, generate_video, session_id):
    if session_id not in chat_memory:
        chat_memory[session_id] = []

    if prompt.lower() in ["exit", "quit"]:
        chat_memory[session_id] = []
        return "🧠 Codette signing off... Session reset.", None, None

    # Load text model if not cached
    if model_name not in text_model_cache:
        try:
            text_model_cache[model_name] = pipeline("text-generation", model=AVAILABLE_MODELS[model_name], device=0 if device == "cuda" else -1)
        except Exception as e:
            return f"[Text model error]: {e}", None, None

    generator = text_model_cache[model_name]
    try:
        output = generator(prompt, max_length=100, do_sample=True, num_return_sequences=1)
        response = output[0]['generated_text'].strip()
    except Exception as e:
        response = f"[Text generation error]: {e}"

    chat_memory[session_id].append(f"🖋️ You > {prompt}")
    chat_memory[session_id].append(f"🧠 Codette > {response}")
    chat_log = "\n".join(chat_memory[session_id][-10:])

    img = None
    if generate_image and image_enabled:
        try:
            img = image_generator(prompt).images[0]
        except Exception as e:
            chat_log += f"\n[Image error]: {e}"

    vid = None
    if generate_video and video_enabled:
        try:
            video_frames = video_pipeline(prompt, num_inference_steps=50).frames
            temp_video_path = tempfile.NamedTemporaryFile(suffix=".mp4", delete=False).name
            imageio.mimsave(temp_video_path, video_frames, fps=8)
            vid = temp_video_path
        except Exception as e:
            chat_log += f"\n[Video error]: {e}"

    return chat_log, img, vid

# ---------- Gradio App ----------
with gr.Blocks(title="Codette Terminal (Hugging Face Edition)") as demo:
    gr.Markdown("## 🧬 Codette Terminal\nA text + image + video AI powered by Hugging Face + Gradio. Type `'exit'` to reset the session.")
    session_id = gr.Textbox(value="session_default", visible=False)
    model_dropdown = gr.Dropdown(choices=list(AVAILABLE_MODELS.keys()), value="GPT-2 (small, fast)", label="Choose a Language Model")
    generate_image_toggle = gr.Checkbox(label="Also generate image?", value=False, interactive=image_enabled)
    generate_video_toggle = gr.Checkbox(label="Also generate video?", value=False, interactive=video_enabled)
    user_input = gr.Textbox(label="Your Prompt", placeholder="e.g. A robot dreaming on Mars", lines=1)
    output_text = gr.Textbox(label="Codette Output", lines=15, interactive=False)
    output_image = gr.Image(label="Generated Image")
    output_video = gr.Video(label="Generated Video")

    user_input.submit(
        codette_terminal,
        inputs=[user_input, model_dropdown, generate_image_toggle, generate_video_toggle, session_id],
        outputs=[output_text, output_image, output_video]
    )

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