import gradio as gr
import json
import numpy as np
from sklearn.manifold import TSNE
import pickle as pkl
import os
import hashlib
import pandas as pd
import plotly.graph_objects as go
from plotly.colors import sample_colorscale
from gradio import update
import re
from utils.interp_space_utils import compute_clusters_style_representation_3, compute_clusters_g2v_representation
from utils.llm_feat_utils import split_features
from utils.gram2vec_feat_utils import get_shorthand, get_fullform

import plotly.io as pio

def clean_text(text: str) -> str:
    """
    Cleans the text by replacing HTML tags with their escaped versions.
    """
    return text.replace('<','&lt;').replace('>','&gt;').replace('\n', '<br>')

def get_instances(instances_to_explain_path: str = 'datasets/instances_to_explain.json'):
    """
    Loads the JSON and returns:
      - instances_to_explain: the raw dict/list of instances
      - instance_ids: list of keys (if dict) or indices (if list)
    """
    instances_to_explain = json.load(open(instances_to_explain_path))
    if isinstance(instances_to_explain, dict):
        instance_ids = list(instances_to_explain.keys())
    else:
        instance_ids = list(range(len(instances_to_explain)))
    return instances_to_explain, instance_ids

def load_instance(instance_id, instances_to_explain: dict):
    """
    Given a selected instance_id and the loaded data,
    returns (mystery_html, c0_html, c1_html, c2_html).
    """
    # normalize instance_id
    try:
        iid = int(instance_id)
    except ValueError:
        iid = instance_id
    data = instances_to_explain[iid]

    predicted_author = data['latent_rank'][0]
    ground_truth_author = data['gt_idx']

    header_html = f"""
    <div style="border:1px solid #ccc; padding:10px; margin-bottom:10px;">
      <h3>Here’s the mystery passage alongside three candidate texts—look for the green highlight to see the predicted author.</h3>
    </div>
    """
    mystery_text = clean_text(data['Q_fullText'])
    mystery_html = f"""
    <div style="
            border: 2px solid #ff5722;      /* accent border */
            background: #fff3e0;            /* very light matching wash */
            border-radius: 6px;
            padding: 1em;
            margin-bottom: 1em;
        ">
        <h3 style="margin-top:0; color:#bf360c;">Mystery Author</h3>
        <p>{clean_text(mystery_text)}</p>
    </div>
    """

    # Candidate boxes
    candidate_htmls = []
    for i in range(3):
        text = data[f'a{i}_fullText']
        title = f"Candidate {i+1}"
        extra_style = ""

        if ground_truth_author == i:
            if ground_truth_author != predicted_author: # highlight the true author only if its different than the predictd one
                title += " (True Author)"
                extra_style = (
                    "border: 2px solid #ff5722; "
                    "background: #fff3e0; " 
                    "padding:10px; "
                )

        
        if predicted_author == i:
            if predicted_author == ground_truth_author:
                title += " (Predicted and True Author)"
            else:
                title += " (Predicted Author)"
            extra_style = (
                "border:2px solid #228B22; "        # dark green border
                "background-color: #e6ffe6; "       # light green fill
                "padding:10px; "
            )
            

        candidate_htmls.append(f"""
        <div style="border:1px solid #ccc; padding:10px; {extra_style}">
          <h4>{title}</h4>
          <p>{clean_text(text)}</p>
        </div>
        """)

    return header_html, mystery_html, candidate_htmls[0], candidate_htmls[1], candidate_htmls[2]

def compute_tsne_with_cache(embeddings: np.ndarray, cache_path: str = 'datasets/tsne_cache.pkl') -> np.ndarray:
    """
    Compute t-SNE with caching to avoid recomputation for the same input.

    Args:
        embeddings (np.ndarray): The input embeddings to compute t-SNE on.
        cache_path (str): Path to the cache file.

    Returns:
        np.ndarray: The t-SNE transformed embeddings.
    """
    # Create a hash of the input embeddings to use as a key
    hash_key = hashlib.md5(embeddings.tobytes()).hexdigest()
    
    if os.path.exists(cache_path):
        with open(cache_path, 'rb') as f:
            cache = pkl.load(f)
    else:
        cache = {}

    if hash_key in cache:
        return cache[hash_key]
    else:
        print("Computing t-SNE")
        tsne_result = TSNE(n_components=2, learning_rate='auto',
                           init='random', perplexity=3).fit_transform(embeddings)
        cache[hash_key] = tsne_result
        with open(cache_path, 'wb') as f:
            pkl.dump(cache, f)
        return tsne_result  

def load_interp_space(cfg):
    interp_space_path      = cfg['interp_space_path'] + 'interpretable_space.pkl'
    interp_space_rep_path  = cfg['interp_space_path'] + 'interpretable_space_representations.json'
    gram2vec_feats_path    = cfg['interp_space_path'] + '/../gram2vec_feats.csv'
    clustered_authors_path = cfg['interp_space_path'] + 'train_authors.pkl'

    # Load authors embeddings and their cluster labels
    clustered_authors_df = pd.read_pickle(clustered_authors_path)
    clustered_authors_df = clustered_authors_df[clustered_authors_df.cluster_label != -1]
    author_embedding = clustered_authors_df.author_embedding.tolist()
    author_labels    = clustered_authors_df.cluster_label.tolist()
    author_ids      = clustered_authors_df.authorID.tolist()

    # filter out gram2vec features that doesn't have representation
    clustered_authors_df['gram2vec_feats'] = clustered_authors_df.gram2vec_feats.apply(lambda feats: [feat for feat in feats if get_shorthand(feat) is not None])
    
    # Load a list of gram2vec features --> we use it to distinguish the cluster representations whether they come from gram2vec or llms
    gram2vec_df = pd.read_csv(gram2vec_feats_path)
    gram2vec_feats = gram2vec_df.gram2vec_feats.unique().tolist()

    # Load interpretable space embeddings and the representation of each dimension
    interpretable_space = pkl.load(open(interp_space_path, 'rb'))
    del interpretable_space[-1] #DBSCAN generate a cluster -1 of all outliers. We don't want this cluster
    dimension_to_latent = {key: interpretable_space[key][0] for key in interpretable_space}

    interpretable_space_rep_df = pd.read_json(interp_space_rep_path)
    #dimension_to_style  = {x[0]: x[1] for x in zip(interpretable_space_rep_df.cluster_label.tolist(), interpretable_space_rep_df[style_feat_clm].tolist())}
    dimension_to_style  = {x[0]: [feat[0] for feat in sorted(x[1].items(), key=lambda feat_w:-feat_w[1])] for x in zip(interpretable_space_rep_df.cluster_label.tolist(), interpretable_space_rep_df[cfg['style_feat_clm']].tolist())}

    if cfg['only_llm_feats']:
        #print('only llm feats')
        dimension_to_style = {dim[0]:[feat for feat in dim[1] if feat not in gram2vec_feats] for dim in dimension_to_style.items()}

    if cfg['only_gram2vec_feats']:
        #print('only gra2vec feats')
        dimension_to_style = {dim[0]:[feat for feat in dim[1] if feat in gram2vec_feats] for dim in dimension_to_style.items()}

    # Take top features from g2v and llm
    def take_to_k_llm_and_g2v_feats(feats_list, top_k):
        g2v_feats = [x for x in feats_list if x in gram2vec_feats][:top_k]
        llm_feats = [x for x in feats_list if x not in gram2vec_feats][:top_k]
        return g2v_feats + llm_feats
    dimension_to_style = {dim[0]: take_to_k_llm_and_g2v_feats(dim[1], cfg['top_k']) for dim in dimension_to_style.items()}


    return {
        'dimension_to_latent': dimension_to_latent, 
        'dimension_to_style' : dimension_to_style, 
        'author_embedding' : author_embedding, 
        'author_labels' : author_labels,
        'author_ids' : author_ids,
        'clustered_authors_df' : clustered_authors_df

    }

#function to handle zoom events
def handle_zoom(event_json, bg_proj, bg_lbls, clustered_authors_df, task_authors_df):
    """
    event_json         – stringified JSON from JS listener
    bg_proj            – (N,2) numpy array with 2D coordinates
    bg_lbls            – list of N author IDs
    clustered_authors_df – pd.DataFrame containing authorID and final_attribute_name
    """
    print("[INFO] Handling zoom event")

    if not event_json:
        return gr.update(value=""), gr.update(value=""), None, None, None

    try:
        ranges = json.loads(event_json)
        (x_min, x_max) = ranges["xaxis"]
        (y_min, y_max) = ranges["yaxis"]
    except (json.JSONDecodeError, KeyError, ValueError):
        return gr.update(value=""), gr.update(value=""), None, None, None

    # Find points within the zoomed region
    mask = (
        (bg_proj[:, 0] >= x_min) & (bg_proj[:, 0] <= x_max) &
        (bg_proj[:, 1] >= y_min) & (bg_proj[:, 1] <= y_max)
    )

    visible_authors = [lbl for lbl, keep in zip(bg_lbls, mask) if keep]

    print(f"[INFO] Zoomed region includes {len(visible_authors)} authors:{visible_authors}")

    # Example: Find features for clusters [2,3,4] that are NOT prominent in cluster [1]
    # llm_feats = compute_clusters_style_representation(
    #     background_corpus_df=clustered_authors_df,
    #     cluster_ids=visible_authors,
    #     cluster_label_clm_name='authorID',
    #     other_cluster_ids=[],
    #     features_clm_name='final_attribute_name_manually_processed'
    # )
    print(f"Task authors: {len(task_authors_df)}, Clustered authors: {len(clustered_authors_df)}")
    merged_authors_df = pd.concat([task_authors_df, clustered_authors_df])
    print(f"Merged authors DataFrame:\n{len(merged_authors_df)}")
    style_analysis_response = compute_clusters_style_representation_3(
        background_corpus_df=merged_authors_df,
        cluster_ids=visible_authors,
        cluster_label_clm_name='authorID',
    )

    llm_feats = ['None'] + style_analysis_response['features']


    merged_authors_df = pd.concat([task_authors_df, clustered_authors_df])
    g2v_feats = compute_clusters_g2v_representation(
        background_corpus_df=merged_authors_df,
        author_ids=visible_authors,
        other_author_ids=[],
        features_clm_name='g2v_vector'
    )

    # Gram2vec features are already in shorthand. convert to human readable for display
    HR_g2v_list = []
    for feat in g2v_feats:
        HR_g2v = get_fullform(feat)
        print(f"\n\n feat: {feat} ---> Human Readable: {HR_g2v}")
        if HR_g2v is None:
            print(f"Skipping Gram2Vec feature without human readable form: {feat}")
        else:
            HR_g2v_list.append(HR_g2v)

    HR_g2v_list = ["None"] + HR_g2v_list

    print(f"[INFO] Found {len(llm_feats)} LLM features and {len(g2v_feats)} Gram2Vec features in the zoomed region.")   
    print(f"[INFO] unfiltered g2v features: {g2v_feats}")

    print(f"[INFO] LLM features: {llm_feats}")
    print(f"[INFO] Gram2Vec features: {HR_g2v_list}")

    return (
        gr.update(choices=llm_feats, value=llm_feats[0]),
        gr.update(choices=HR_g2v_list, value=HR_g2v_list[0]),
        style_analysis_response,
        llm_feats,
        visible_authors
    )
    # return gr.update(value="\n".join(llm_feats).join("\n").join(g2v_feats)), llm_feats, g2v_feats

def handle_zoom_with_retries(event_json, bg_proj, bg_lbls, clustered_authors_df, task_authors_df):
    """
    event_json         – stringified JSON from JS listener
    bg_proj            – (N,2) numpy array with 2D coordinates
    bg_lbls            – list of N author IDs
    clustered_authors_df – pd.DataFrame containing authorID and final_attribute_name
    task_authors_df   – pd.DataFrame containing authorID and final_attribute_name
    """
    print("[INFO] Handling zoom event with retries")

    for attempt in range(3):
        try:
            return handle_zoom(event_json, bg_proj, bg_lbls, clustered_authors_df, task_authors_df)
        except Exception as e:
            print(f"[ERROR] Attempt {attempt + 1} failed: {e}")
            if attempt < 2:
                print("[INFO] Retrying...")
    return (
        None,
        None,
        None,
        None,
        None
    )


def visualize_clusters_plotly(iid, cfg, instances, model_radio, custom_model_input, task_authors_df, background_authors_embeddings_df, pred_idx=None, gt_idx=None):
    model_name = model_radio if model_radio != "Other" else custom_model_input
    embedding_col_name = f'{model_name.split("/")[-1]}_style_embedding'
    print(background_authors_embeddings_df.columns)
    print("Generating cluster visualization")
    iid = int(iid)
    interp      = load_interp_space(cfg)
    # dim2lat     = interp['dimension_to_latent']
    style_names = interp['dimension_to_style']
    # bg_emb      = np.array(interp['author_embedding'])
    # print(f"bg_emb shape: {bg_emb.shape}")
    #replace with cached embedddings
    bg_emb      = np.array(background_authors_embeddings_df[embedding_col_name].tolist()) #placeholder for background embeddings
    print(f"bg_emb shape: {bg_emb.shape}")
    # print("interp.keys():", interp.keys())
    #bg_lbls     = interp['author_labels']
    #bg_ids      = interp['author_ids']
    bg_ids = task_authors_df['authorID'].tolist() + background_authors_embeddings_df['authorID'].tolist()
    # inst         = instances[iid]
    # print("inst.keys():", inst.keys())
    # q_lat        = np.array(inst['author_latents'][:1])
    # print(f"q_lat shape: {q_lat.shape}")
    # c_lat        = np.array(inst['author_latents'][1:])
    # print(f"c_lat shape: {c_lat.shape}")
    # pred_idx     = inst['latent_rank'][0]
    # gt_idx       = inst['gt_idx']
    q_lat = np.array(task_authors_df[embedding_col_name].iloc[0]).reshape(1, -1) # Mystery author latent
    print(f"q_lat shape: {q_lat.shape}")
    c_lat = np.array(task_authors_df[embedding_col_name].iloc[1:].tolist())  # Candidate authors latents
    print(f"c_lat shape: {c_lat.shape}")

    # cent_emb = np.array([v for _,v in dim2lat.items()])
    # cent_lbl = np.array([k for k,_ in dim2lat.items()])

    # all_emb = np.vstack([q_lat, c_lat, bg_emb, cent_emb])
    all_emb = np.vstack([q_lat, c_lat, bg_emb])
    proj    = compute_tsne_with_cache(all_emb)

    # split
    q_proj    = proj[0]
    c_proj    = proj[1:4]
    #bg_proj   = proj[4:4+len(bg_lbls)]
    bg_proj   = proj

    # cent_proj = proj[4+len(bg_lbls):]


    # find nearest centroid
    # dists = np.linalg.norm(cent_proj - q_proj, axis=1)
    # idx   = int(np.argmin(dists))
    # cluster_label_query = cent_lbl[idx]
    # features of the nearest centroid to display
    # feature_list = style_names[cluster_label_query]

    # cluster_labels_per_candidate = [
    #     cent_lbl[int(np.argmin(np.linalg.norm(cent_proj - c_proj[i], axis=1)))]
    #     for i in range(c_proj.shape[0])
    # ]

    # prepare colorscale
    # n_cent = len(cent_lbl)
    # cent_colors = sample_colorscale("algae", [i/(n_cent-1) for i in range(n_cent)])
    # map each cluster label to its color
    # color_map = { label: cent_colors[i] for i, label in enumerate(cent_lbl) }

    # uncomment the following line to show background authors
    ## background author colors pulled from their cluster label
    # bg_colors = [ color_map[label] for label in bg_lbls ]

    # 2) build Plotly figure
    fig = go.Figure()

    fig.update_layout(
        template='plotly_white',
        margin=dict(l=40,r=40,t=60,b=40),
        autosize=True,
        hovermode='closest',
        # Enable zoom events
        dragmode='zoom'  
    )
    
    # fig.update_layout(
    #     template='plotly_white',
    #     margin=dict(l=40,r=40,t=60,b=40),
    #     autosize=True,
    #     hovermode='closest')


    # uncomment the following line to show background authors
    ## background authors (light grey dots)
    fig.add_trace(go.Scattergl(
        x=bg_proj[:,0], y=bg_proj[:,1],
        mode='markers',
        marker=dict(size=6, color="#d3d3d3"),# color=bg_colors
        name='Background authors',
        hoverinfo='skip'
    ))

    # centroids (rainbow colors + hovertext of your top-k features)
    # hover_texts = [
    #     f"Cluster {lbl}<br>" + "<br>".join(style_names[lbl])
    #     for lbl in cent_lbl
    # ]
    # fig.add_trace(go.Scattergl(
    #     x=cent_proj[:,0], y=cent_proj[:,1],
    #     mode='markers',
    #     marker=dict(symbol='triangle-up', size=10, color="#d3d3d3"),#color=cent_colors
    #     name='Cluster centroids',
    #     hovertext=hover_texts,
    #     hoverinfo='text'
    # ))

    # three candidates
    marker_syms = ['diamond','pentagon','x']
    for i in range(3):
        # label = f"Candidate {i+1}" + (" (predicted)" if i==pred_idx else "")
        base = f"Candidate {i+1}"
        # pick the right suffix
        if i == pred_idx and i == gt_idx:
            suffix = " (Predicted & Ground Truth)"
        elif i == pred_idx:
            suffix = " (Predicted)"
        elif i == gt_idx:
            suffix = "(Ground Truth)"
        else:
            suffix = ""

        label = base + suffix
        fig.add_trace(go.Scattergl(
            x=[c_proj[i,0]], y=[c_proj[i,1]],
            mode='markers',
            marker=dict(symbol=marker_syms[i], size=12, color='darkblue'),
            name=label,
            hoverinfo='skip'
        ))

    # query author
    fig.add_trace(go.Scattergl(
        x=[q_proj[0]], y=[q_proj[1]],
        mode='markers',
        marker=dict(symbol='star', size=14, color='red'),
        name='Mystery author',
        hoverinfo='skip'
    ))

    # ── Arrowed annotations for mystery + candidates ──────────────────────────
    # Mystery author (red star)
    fig.add_annotation(
        x=q_proj[0], y=q_proj[1],
        xref='x', yref='y',
        text="Mystery",
        showarrow=True,
        arrowhead=2,
        arrowsize=1,
        arrowwidth=1.5,
        ax=40,   # tail offset in pixels: moves the label 40px to the right
        ay=-40,  # moves the label 40px up
        font=dict(color='red', size=12)
    )

    # Candidate authors (dark blue ◆)
    offsets = [(-40, -30), (40, -30), (0, 40)]  # [(ax,ay) for Cand1, Cand2, Cand3]
    for i in range(3):
        # build the right label
        if i == pred_idx and i == gt_idx:
            label = f"Candidate {i+1} (Predicted & Ground Truth)"
        elif i == pred_idx:
            label = f"Candidate {i+1} (Predicted)"
        elif i == gt_idx:
            label = f"Candidate {i+1} (Ground Truth)"
        else:
            label = f"Candidate {i+1}"

        fig.add_annotation(
            x=c_proj[i,0], y=c_proj[i,1],
            xref='x', yref='y',
            text= label,
            showarrow=True,
            arrowhead=2,
            arrowsize=1,
            arrowwidth=1.5,
            ax=offsets[i][0],
            ay=offsets[i][1],
            font=dict(color='darkblue', size=12)
        )

    print('Done processing....')
    # Prepare outputs for the new cluster‐dropdown UI
    # all_clusters = sorted(style_names.keys())
    # --- build display names for the dropdown ---
    # sorted_labels = sorted([int(lbl) for lbl in cent_lbl])
    # display_clusters = []
    # for lbl in sorted_labels:
    #     name = f"Cluster {lbl}"
    #     if lbl == cluster_label_query:
    #         name += " (closest to mystery author)"
    #     matching_indices = [i + 1 for i, val in enumerate(cluster_labels_per_candidate) if int(val) == lbl]
    #     if matching_indices:
    #         if len(matching_indices) == 1:
    #             name += f" (closest to Candidate {matching_indices[0]} author)"
    #         else:
    #             candidate_str = ", ".join(f"Candidate {i}" for i in matching_indices)
    #             name += f" (closest to {candidate_str} authors)"
    #     display_clusters.append(name)
    # print(f"All clusters: {all_clusters}")
    # return: figure, dropdown payload, full style_map
    return (
      fig,
    #   update(choices=display_clusters, value=display_clusters[cluster_label_query]),
      style_names, 
      bg_proj,  # Return background points
      bg_ids,    # Return background labels
      background_authors_embeddings_df,  # Return the DataFrame for zoom handling

    )
    # return fig, update(choices=feature_list, value=feature_list[0]),feature_list


def extract_cluster_key(display_label: str) -> int:
    """
    Given a dropdown label like
      "Cluster 5 (closest to mystery author; closest to Candidate 1 author)"
    returns the integer 5.
    """
    m = re.match(r"Cluster\s+(\d+)", display_label)
    if not m:
        raise ValueError(f"Unrecognized cluster label: {display_label}")
    return int(m.group(1))



# When a cluster is selected, split features and populate radio buttons
def on_cluster_change(selected_cluster, style_map):
    cluster_key = extract_cluster_key(selected_cluster)
    all_feats = style_map[cluster_key]
    llm_feats, g2v_feats = split_features(all_feats)
    # print(f"Selected cluster: {selected_cluster} ({cluster_key})")
    # print(f"LLM features: {llm_feats}")

    # Add "None" as a default selectable option
    llm_feats = ["None"] + llm_feats

    # filter out any g2v feature without a shorthand
    filtered_g2v = []
    for feat in g2v_feats:
        if get_shorthand(feat) is None:
            print(f"Skipping Gram2Vec feature without shorthand: {feat}")
        else:
            filtered_g2v.append(feat)
    
    # Add "None" as a default selectable option
    filtered_g2v = ["None"] + filtered_g2v

    return (
        gr.update(choices=llm_feats, value=llm_feats[0]),
        gr.update(choices=filtered_g2v, value=filtered_g2v[0]),
        llm_feats
    )