import streamlit as st
import kornia
from torch import nn
import torch
from torchvision.transforms import functional as F
from torchvision.utils import make_grid
from streamlit_ace import st_ace
from PIL import Image

IS_LOCAL = False #Change this

@st.cache(suppress_st_warning=True)
def set_transform(content):
    #     st.write("set transform")
    try:
        transform = eval(content, {"kornia": kornia, "nn": nn}, None)
    except Exception as e:
        st.write(f"There was an error: {e}")
        transform = nn.Sequential()
    return transform

st.markdown("# Kornia Augmentations Demo")
st.sidebar.markdown(
    "[Kornia](https://github.com/kornia/kornia) is a *differentiable* computer vision library for PyTorch."
)
ims=[]
uploaded_files = st.sidebar.file_uploader("Choose a file",accept_multiple_files=True)
if uploaded_files is not None:
    for uploaded_file in uploaded_files: 
        im = Image.open(uploaded_file)
        st.sidebar.image(im, caption="Input Image", width=256)
        im=im.resize((512,512))
        image = F.pil_to_tensor(im).float() / 255
        ims.append(image) 
else:
    im = Image.open("./images/pretty_bird.jpg")
    st.sidebar.image(im, caption="Input Image", width=256)
    image = F.pil_to_tensor(im).float() / 255
    ims.append(image) 
scaler = 256

# batch size is just for show
batch_size = st.sidebar.slider("batch_size", min_value=4, max_value=16,value=8)
gpu = st.sidebar.checkbox("Use GPU!", value=True)
if not gpu:
    st.sidebar.markdown("With Kornia you do ops on the GPU!")
    device = torch.device("cpu")
else:
    if not IS_LOCAL:
        st.sidebar.markdown("(GPU Not available on hosted demo, try on your local!)")
        # Credits   
        st.sidebar.caption("Demo made by [Ceyda Cinarel](https://linktr.ee/ceydai)")
        st.sidebar.markdown("Clone [Code](https://github.com/cceyda/kornia-demo)")
        device = torch.device("cpu")
    else:
        st.sidebar.markdown("Running on GPU~")
        device = torch.device("cuda:0")

predefined_transforms = [
    """
nn.Sequential(
   kornia.augmentation.RandomAffine(degrees=360,p=0.5),
   kornia.augmentation.ColorJitter(brightness=0.2, contrast=0.3, saturation=0.2, hue=0.3, p=1)
)
# p=0.5 is the probability of applying the transformation
""",
    """
nn.Sequential(
   kornia.augmentation.RandomErasing(scale=(.4, .8), ratio=(.3, 1/.3), p=0.5),
)
""",
    """
nn.Sequential(
   kornia.augmentation.RandomErasing(scale=(.4, .8), ratio=(.3, 1/.3), p=1, same_on_batch=False),
)
#By setting same_on_batch=True you can apply the same transform across the batch
""",
    f"""
nn.Sequential(
    kornia.augmentation.RandomResizedCrop(size=({scaler}, {scaler}), scale=(3., 3.), ratio=(2., 2.), p=1.),
    kornia.augmentation.RandomHorizontalFlip(p=0.7),
    kornia.augmentation.RandomGrayscale(p=0.5),
)
""",
]

selected_transform = st.selectbox(
    "Pick an augmentation pipeline example:", predefined_transforms
)

st.write("Transform to apply:")
readonly = False
content = st_ace(
    value=selected_transform,
    height=150,
    language="python",
    keybinding="vscode",
    show_gutter=True,
    show_print_margin=True,
    wrap=False,
    auto_update=False,
    readonly=readonly,
)
if content:
    #     st.write(content)
    transform = set_transform(content)

# st.write(transform)

# with st.echo():
#     transform = nn.Sequential(
#        K.RandomAffine(360),
#        K.ColorJitter(0.2, 0.3, 0.2, 0.3)
#     )

process = st.button("Next Batch")

# Fake dataloader
if len(ims)>1:
    image_batch = torch.stack(ims)
else:
    image_batch = torch.stack(batch_size * ims)


image_batch.to(device)
transformeds = None
try:
    transformeds = transform(image_batch)
except Exception as e:
    st.write(f"There was an error: {e}")
    



cols = st.columns(4)

# st.image(F.to_pil_image(make_grid(transformeds)))
if transformeds is not None:
    for i, x in enumerate(transformeds):
        i = i % 4
        cols[i].image(F.to_pil_image(x), use_column_width=True)

st.markdown(
    "There are a lot more transformations available: [Documentation](https://kornia.readthedocs.io/en/latest/augmentation.module.html)"
)
st.markdown(
    "Kornia can do a lot more than augmentations~ [Check it out](https://kornia.readthedocs.io/en/latest/introduction.html#highlighted-features)"
)
# if process:
#     pass