import collections
import heapq
import json
import os
import logging

import gradio as gr
import numpy as np
import polars as pl
import torch
import torch.nn.functional as F
from open_clip import create_model, get_tokenizer
from torchvision import transforms

from templates import openai_imagenet_template
from components.query import  get_sample

log_format = "[%(asctime)s] [%(levelname)s] [%(name)s] %(message)s"
logging.basicConfig(level=logging.INFO, format=log_format)
logger = logging.getLogger()

hf_token = os.getenv("HF_TOKEN")

# For sample images
METADATA_PATH = "components/metadata.csv"
# Read page ID as int and filter out smaller ablation duplicated training split
metadata_df = pl.read_csv(METADATA_PATH, low_memory = False)
metadata_df = metadata_df.with_columns(pl.col("eol_page_id").cast(pl.Int64))

model_str = "hf-hub:imageomics/bioclip"
tokenizer_str = "ViT-B-16"

txt_emb_npy = "txt_emb_species.npy"
txt_names_json = "txt_emb_species.json"

min_prob = 1e-9
k = 5

device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")

preprocess_img = transforms.Compose(
    [
        transforms.ToTensor(),
        transforms.Resize((224, 224), antialias=True),
        transforms.Normalize(
            mean=(0.48145466, 0.4578275, 0.40821073),
            std=(0.26862954, 0.26130258, 0.27577711),
        ),
    ]
)

ranks = ("Kingdom", "Phylum", "Class", "Order", "Family", "Genus", "Species")

open_domain_examples = [
    ["examples/Ursus-arctos.jpeg", "Species"],
    ["examples/Phoca-vitulina.png", "Species"],
    ["examples/Felis-catus.jpeg", "Genus"],
    ["examples/Sarcoscypha-coccinea.jpeg", "Order"],
]
zero_shot_examples = [
    [
        "examples/Ursus-arctos.jpeg",
        "brown bear\nblack bear\npolar bear\nkoala bear\ngrizzly bear",
    ],
    ["examples/milk-snake.png", "coral snake\nmilk snake"],
    ["examples/coral-snake.jpeg", "coral snake\nmilk snake"],
    [
        "examples/Carnegiea-gigantea.png",
        "Carnegiea gigantea\nSchlumbergera opuntioides\nMammillaria albicoma",
    ],
    [
        "examples/Amanita-muscaria.jpeg",
        "Amanita fulva\nAmanita vaginata (grisette)\nAmanita calyptrata (coccoli)\nAmanita crocea\nAmanita rubescens (blusher)\nAmanita caesarea (Caesar's mushroom)\nAmanita jacksonii (American Caesar's mushroom)\nAmanita muscaria (fly agaric)\nAmanita pantherina (panther cap)",
    ],
    [
        "examples/Actinostola-abyssorum.png",
        "Animalia Cnidaria Hexacorallia Actiniaria Actinostolidae Actinostola abyssorum\nAnimalia Cnidaria Hexacorallia Actiniaria Actinostolidae Actinostola bulbosa\nAnimalia Cnidaria Hexacorallia Actiniaria Actinostolidae Actinostola callosa\nAnimalia Cnidaria Hexacorallia Actiniaria Actinostolidae Actinostola capensis\nAnimalia Cnidaria Hexacorallia Actiniaria Actinostolidae Actinostola carlgreni",
    ],
    [
        "examples/Sarcoscypha-coccinea.jpeg",
        "scarlet elf cup (coccinea)\nscharlachroter kelchbecherling (austriaca)\ncrimson cup (dudleyi)\nstalked scarlet cup (occidentalis)",
    ],
    [
        "examples/Onoclea-hintonii.jpg",
        "Onoclea attenuata\nOnoclea boryana\nOnoclea hintonii\nOnoclea intermedia\nOnoclea sensibilis",
    ],
    [
        "examples/Onoclea-sensibilis.jpg",
        "Onoclea attenuata\nOnoclea boryana\nOnoclea hintonii\nOnoclea intermedia\nOnoclea sensibilis",
    ],
]


def indexed(lst, indices):
    return [lst[i] for i in indices]


@torch.no_grad()
def get_txt_features(classnames, templates):
    all_features = []
    for classname in classnames:
        txts = [template(classname) for template in templates]
        txts = tokenizer(txts).to(device)
        txt_features = model.encode_text(txts)
        txt_features = F.normalize(txt_features, dim=-1).mean(dim=0)
        txt_features /= txt_features.norm()
        all_features.append(txt_features)
    all_features = torch.stack(all_features, dim=1)
    return all_features


@torch.no_grad()
def zero_shot_classification(img, cls_str: str) -> dict[str, float]:
    classes = [cls.strip() for cls in cls_str.split("\n") if cls.strip()]
    txt_features = get_txt_features(classes, openai_imagenet_template)

    img = preprocess_img(img).to(device)
    img_features = model.encode_image(img.unsqueeze(0))
    img_features = F.normalize(img_features, dim=-1)

    logits = (model.logit_scale.exp() * img_features @ txt_features).squeeze()
    probs = F.softmax(logits, dim=0).to("cpu").tolist()
    return {cls: prob for cls, prob in zip(classes, probs)}


def format_name(taxon, common):
    taxon = " ".join(taxon)
    if not common:
        return taxon
    return f"{taxon} ({common})"


@torch.no_grad()
def open_domain_classification(img, rank: int, return_all=False):
    """
    Predicts from the entire tree of life.
    If targeting a higher rank than species, then this function predicts among all
    species, then sums up species-level probabilities for the given rank.
    """

    logger.info(f"Starting open domain classification for rank: {rank}")
    img = preprocess_img(img).to(device)
    img_features = model.encode_image(img.unsqueeze(0))
    img_features = F.normalize(img_features, dim=-1)

    logits = (model.logit_scale.exp() * img_features @ txt_emb).squeeze()
    probs = F.softmax(logits, dim=0)

    if rank + 1 == len(ranks):
        topk = probs.topk(k)
        prediction_dict = {
            format_name(*txt_names[i]): prob for i, prob in zip(topk.indices, topk.values)
        }
        logger.info(f"Top K predictions: {prediction_dict}")
        top_prediction_name = format_name(*txt_names[topk.indices[0]]).split("(")[0]
        logger.info(f"Top prediction name: {top_prediction_name}")
        sample_img, taxon_url = get_sample(metadata_df, top_prediction_name, rank)
        if return_all:
            return prediction_dict, sample_img, taxon_url
        return prediction_dict

    output = collections.defaultdict(float)
    for i in torch.nonzero(probs > min_prob).squeeze():
        output[" ".join(txt_names[i][0][: rank + 1])] += probs[i]

    topk_names = heapq.nlargest(k, output, key=output.get)
    prediction_dict = {name: output[name] for name in topk_names}
    logger.info(f"Top K names for output: {topk_names}")
    logger.info(f"Prediction dictionary: {prediction_dict}")

    top_prediction_name = topk_names[0]
    logger.info(f"Top prediction name: {top_prediction_name}")
    sample_img, taxon_url = get_sample(metadata_df, top_prediction_name, rank)
    logger.info(f"Sample image and taxon URL: {sample_img}, {taxon_url}")

    if return_all:
        return prediction_dict, sample_img, taxon_url
    return prediction_dict


def change_output(choice):
    return gr.Label(num_top_classes=k, label=ranks[choice], show_label=True, value=None)


if __name__ == "__main__":
    logger.info("Starting.")
    model = create_model(model_str, output_dict=True, require_pretrained=True)
    model = model.to(device)
    logger.info("Created model.")

    model = torch.compile(model)
    logger.info("Compiled model.")

    tokenizer = get_tokenizer(tokenizer_str)

    txt_emb = torch.from_numpy(np.load(txt_emb_npy, mmap_mode="r")).to(device)
    with open(txt_names_json) as fd:
        txt_names = json.load(fd)

    done = txt_emb.any(axis=0).sum().item()
    total = txt_emb.shape[1]
    status_msg = ""
    if done != total:
        status_msg = f"{done}/{total} ({done / total * 100:.1f}%) indexed"

    with gr.Blocks() as app:
        
        with gr.Tab("Open-Ended"):
            with gr.Row(variant = "panel", elem_id = "images_panel"):
                with gr.Column():
                    img_input = gr.Image(height = 400, sources=["upload"])
            
                with gr.Column():
                    # display sample image of top predicted taxon
                    sample_img = gr.Image(label = "Sample Image of Predicted Taxon", 
                                        height = 400, 
                                        show_download_button = False)
                
                    taxon_url = gr.HTML(label = "More Information", 
                                    elem_id = "url"
                                    )

            with gr.Row():
                with gr.Column():
                    rank_dropdown = gr.Dropdown(
                        label="Taxonomic Rank",
                        info="Which taxonomic rank to predict. Fine-grained ranks (genus, species) are more challenging.",
                        choices=ranks,
                        value="Species",
                        type="index",
                    )
                    open_domain_btn = gr.Button("Submit", variant="primary")
                with gr.Column():
                    open_domain_output = gr.Label(
                        num_top_classes=k,
                        label="Prediction",
                        show_label=True,
                        value=None,
                    )
                  #  open_domain_flag_btn = gr.Button("Flag Mistake", variant="primary")

            with gr.Row():
                gr.Examples(
                    examples=open_domain_examples,
                    inputs=[img_input, rank_dropdown],
                    cache_examples=True,
                    fn=lambda img, rank: open_domain_classification(img, rank, return_all=False),
                    outputs=[open_domain_output],
                )
            '''
            # Flagging Code
            open_domain_callback = gr.HuggingFaceDatasetSaver(
                hf_token, "bioclip-demo-open-domain-mistakes", private=True
            )
            open_domain_callback.setup(
                [img_input, rank_dropdown, open_domain_output],
                flagging_dir="bioclip-demo-open-domain-mistakes/logs/flagged",
            )
            open_domain_flag_btn.click(
                lambda *args: open_domain_callback.flag(args),
                [img_input, rank_dropdown, open_domain_output],
                None,
                preprocess=False,
            )
            '''
        with gr.Tab("Zero-Shot"):
            with gr.Row():
                img_input_zs = gr.Image(height = 400, sources=["upload"])

            with gr.Row():
                with gr.Column():
                    classes_txt = gr.Textbox(
                        placeholder="Canis familiaris (dog)\nFelis catus (cat)\n...",
                        lines=3,
                        label="Classes",
                        show_label=True,
                        info="Use taxonomic names where possible; include common names if possible.",
                    )
                    zero_shot_btn = gr.Button("Submit", variant="primary")

                with gr.Column():
                    zero_shot_output = gr.Label(
                        num_top_classes=k, label="Prediction", show_label=True
                    )
             #       zero_shot_flag_btn = gr.Button("Flag Mistake", variant="primary")

            with gr.Row():
                gr.Examples(
                    examples=zero_shot_examples,
                    inputs=[img_input_zs, classes_txt],
                    cache_examples=True,
                    fn=zero_shot_classification,
                    outputs=[zero_shot_output],
                )
        '''
        # Flagging Code
        zero_shot_callback = gr.HuggingFaceDatasetSaver(
            hf_token, "bioclip-demo-zero-shot-mistakes", private=True
        )
        zero_shot_callback.setup(
            [img_input, zero_shot_output], flagging_dir="bioclip-demo-zero-shot-mistakes/logs/flagged"
        )
        zero_shot_flag_btn.click(
            lambda *args: zero_shot_callback.flag(args),
            [img_input, zero_shot_output],
            None,
            preprocess=False,
        )
        '''
        rank_dropdown.change(
            fn=change_output, inputs=rank_dropdown, outputs=[open_domain_output]
        )

        open_domain_btn.click(
            fn=lambda img, rank: open_domain_classification(img, rank, return_all=True),
            inputs=[img_input, rank_dropdown],
            outputs=[open_domain_output, sample_img, taxon_url],
        )

        zero_shot_btn.click(
            fn=zero_shot_classification,
            inputs=[img_input_zs, classes_txt],
            outputs=zero_shot_output,
        )
        
        # Footer to point out to model and data from app page.
        gr.Markdown(
            """
            For more information on the [BioCLIP Model](https://huggingface.co/imageomics/bioclip) creation, see our [BioCLIP Project GitHub](https://github.com/Imageomics/bioclip), and
            for easier integration of BioCLIP, checkout [pybioclip](https://github.com/Imageomics/pybioclip).
            
            To learn more about the data, check out our [TreeOfLife-10M Dataset](https://huggingface.co/datasets/imageomics/TreeOfLife-10M).
            """
        )

    app.queue(max_size=20)
    app.launch(share=True)