import os
import random
import uuid

import gradio as gr
from datasets import load_dataset

HF_TOKEN = os.environ.get('HF_TOKEN')
HF_DATASET = os.environ.get('HF_DATASET')

configuration = "commitchronicle-py-long"  # select a configuration
dataset = load_dataset("JetBrains-Research/lca-cmg",
                       configuration,
                       split="test",
                       cache_dir="data")
n_samples = len(dataset)

saver = gr.HuggingFaceDatasetSaver(HF_TOKEN, HF_DATASET, private=True)


def get_github_api_url(repo, hash):
    repo_url = f"https://api.github.com/repos/{repo}/commits/{hash}"
    return repo_url


DIFF_VIEW_UPDATE_JS_FN = """
<script>
function updateDiffView() {
    var github_api_url = document.getElementById('diff-view').getAttribute("github-api-url");
    var xmlHttp = new XMLHttpRequest();
        xmlHttp.onreadystatechange = function() {{ 
            if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
                var diff = xmlHttp.responseText;
                console.log(diff);
                var targetElement = document.getElementById('diff-view');
                var configuration = { 
                    drawFileList: true, 
                    matching: 'lines', 
                    highlight: true 
                };
                var diff2htmlUi = new Diff2HtmlUI(targetElement, diff, configuration);
                diff2htmlUi.draw();
        }}
        xmlHttp.open("GET", github_api_url, true);
        xmlHttp.setRequestHeader("Accept", "application/vnd.github.v3.diff");
        xmlHttp.send();
}
</script>
"""


def get_diff2html_view(github_api_url):
    html = f"""
    <div style='width:100%; height:720px; overflow:auto'>
        <div 
            id='diff-view' 
            github-api-url="{github_api_url}"
        ></div>
    </div>
    """

    return html


def update_commit_view(sample_ind):
    if sample_ind >= n_samples:
        return None

    record = dataset[sample_ind]
    github_api_url = get_github_api_url(record['repo'], record['hash'])

    # github_link_md = f"[See the commit on GitHub]({github_link})"

    diff_view = get_diff2html_view(github_api_url)
    commit_msg = record['message']
    repo_val = record['repo']
    hash_val = record['hash']
    return diff_view, commit_msg, repo_val, hash_val


def next_sample(current_sample_ind, shuffled_idx):
    if current_sample_ind == n_samples:
        return None

    current_sample_ind += 1
    updated_view = update_commit_view(shuffled_idx[current_sample_ind])
    return (current_sample_ind,) + updated_view


DIFF2HTML_IMPORTS = """
<!-- Stylesheet -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/styles/github.min.css" />
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css" />

<!-- Javascripts -->
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html-ui.min.js"></script>
"""

with gr.Blocks(theme=gr.themes.Soft(), head=DIFF2HTML_IMPORTS + DIFF_VIEW_UPDATE_JS_FN) as application:
    repo_val = gr.Textbox(interactive=False, label='repo', visible=False)
    hash_val = gr.Textbox(interactive=False, label='hash', visible=False)
    shuffled_idx_val = gr.JSON(visible=False)

    with gr.Row():
        current_sample_sld = gr.Slider(minimum=0, maximum=n_samples, step=1,
                                       value=0,
                                       interactive=False,
                                       label='sample_ind',
                                       info=f"Samples labeled/skipped (out of {n_samples})",
                                       show_label=False,
                                       container=False,
                                       scale=5)
        with gr.Column(scale=1):
            skip_btn = gr.Button("Skip the current sample")
    with gr.Row():
        with gr.Column(scale=2):
            # github_link = gr.Markdown()
            diff_view = gr.HTML()
        with gr.Column(scale=1):
            commit_msg = gr.Textbox(label="Commit message",
                                    interactive=False,
                                    )
            gr.Markdown("## Please, answer the questions below")
            verbosity_feedback = gr.Radio(info='How can you describe the length of the commit message above?',
                                          label='verbosity',
                                          show_label=False,
                                          choices=[
                                              ('Too short', 0),
                                              ('Just right', 1),
                                              ('Too verbose', 2)])
            correctness_feedback = gr.Radio(info='Is the commit message factually correct?',
                                            label='is_correct',
                                            show_label=False,
                                            choices=[
                                                ('Yes', True),
                                                ('No', False)])
            format_feedback = gr.Slider(info='Rate the commit message\'s format (1 - very bad, 5 - very good)',
                                        label='format_score',
                                        show_label=False,
                                        minimum=1,
                                        step=1,
                                        interactive=True,
                                        maximum=5)
            submit_btn = gr.Button("Submit and continue")
            session_val = gr.Textbox(info='Session', interactive=False, container=True, show_label=False,
                                     label='session')

    commit_view = [
        # github_link,
        diff_view,
        commit_msg,
        repo_val,
        hash_val
    ]

    feedback_form = [
        session_val,
        repo_val,
        hash_val,
        verbosity_feedback,
        correctness_feedback,
        format_feedback
    ]

    saver.setup([current_sample_sld] + feedback_form, "feedback")

    skip_btn.click(next_sample, inputs=[current_sample_sld, shuffled_idx_val],
                   outputs=[current_sample_sld] + commit_view)


    def submit(current_sample, shuffled_idx, *args):
        saver.flag((current_sample,) + args)
        return next_sample(current_sample, shuffled_idx)


    submit_btn.click(submit, inputs=[current_sample_sld, shuffled_idx_val] + feedback_form,
                     outputs=[current_sample_sld] + commit_view)


    def init_session(current_sample):
        session = str(uuid.uuid4())
        shuffled_idx = list(range(n_samples))
        random.shuffle(shuffled_idx)
        return (session, shuffled_idx) + update_commit_view(shuffled_idx[current_sample])


    application.load(init_session, inputs=[current_sample_sld], outputs=[session_val, shuffled_idx_val] + commit_view)

application.launch()