import copy
import glob
import json
import os
# Necessary for `requests`. Without set correct path or empty string it fails during process HTTPS connection with this: [Errno 101] Network is unreachable
if os.path.exists("/etc/ssl/certs/ca-certificates.crt"):
    os.environ["CURL_CA_BUNDLE"] = "/etc/ssl/certs/ca-certificates.crt"
    os.environ["REQUESTS_CA_BUNDLE"] = "/etc/ssl/certs/ca-certificates.crt"
else:
    os.environ["CURL_CA_BUNDLE"] = ""
    os.environ["REQUESTS_CA_BUNDLE"] = ""
print(f"{os.environ.get('CURL_CA_BUNDLE') = }")
print(f"{os.environ.get('REQUESTS_CA_BUNDLE') = }")

import hashlib
import time
import requests
from collections import namedtuple
from xml.sax.saxutils import escape as xmlEscape, quoteattr as xmlQuoteAttr
from threading import Lock

import gradio as gr
import pandas as pd
from huggingface_hub import HfApi, snapshot_download

from compare_significance import SUPPORTED_METRICS

VISIBLE_METRICS = SUPPORTED_METRICS + ["macro_f1"]

api = HfApi()

ORG = "CZLC"
REPO = f"{ORG}/LLM_benchmark_data"
HF_TOKEN = os.environ.get("HF_TOKEN")
TASKS_METADATA_PATH = "./tasks_metadata.json"

MARKDOWN_SPECIAL_CHARACTERS = {
    "#": "#",  # for usage in xml.sax.saxutils.escape as entities must be first
    "\\": "\",
    "`": "`",
    "*": "*",
    "_": "_",
    "{": "{",
    "}": "}",
    "[": "[",
    "]": "]",
    "(": "(",
    ")": ")",
    "+": "+",
    "-": "-",
    ".": ".",
    "!": "!",
    "=": "=",
    "|": "|"
}

def check_significance_send_task(model_a_path, model_b_path):
    url = 'https://czechllm.fit.vutbr.cz/benczechmark-leaderboard/compare_significance/'

    # prepare and send request
    with (
        open(model_a_path, 'rb') as model_a_fp,
        open(model_b_path, 'rb') as model_b_fp,
    ):
        files = {
            'model_a': model_a_fp,
            'model_b': model_b_fp,
        }
        response = requests.post(url, files=files, timeout=60 * 5)

    # check response
    if response.status_code == 202:
        result_url = response.url
        #task_id = response.json()['task_id']
    elif response.status_code == 429:
        raise RuntimeError('Server is too busy. Please try again later.')  # TODO: try-except do raise gr.error
    else:
        raise RuntimeError(f'Failed to submit task. Status code: {response.status_code}')  # TODO: try-except do raise gr.error

    return result_url

def check_significance_wait_for_result(result_url):
    while True:
        response = requests.get(result_url, timeout=60 * 5)
        if response.status_code == 200:
            result = response.json()
            break
        elif response.status_code == 202:
            time.sleep(5)
        else:
            raise RuntimeError(f'Failed to get result. Status code: {response.status_code}')  # TODO: try-except do raise gr.error

    if result["state"] == "COMPLETED":
        return result['result']
    else:
        raise RuntimeError(result['result']['error'])

def check_significance(model_a_path, model_b_path):
    result_url = check_significance_send_task(model_a_path, model_b_path)
    result = check_significance_wait_for_result(result_url)
    return result

pre_submit_lock = Lock()

class _ReadLock:
    def __init__(self, lock):
       self._lock = lock
       self.reading = 0
    
    def __enter__(self):
        with self._lock:
            self.reading += 1
    
    def __exit__(self, exc_type, exc_value, traceback):
        with self._lock:
            self.reading -= 1

class ReadWriteLock:
    """
    Zámek, který ověří, že nikdo nečte když se zapisuje a že zapisuje pouze jeden
    """
    
    def __init__(self):
       self._lock = Lock()
       self.ro = _ReadLock(self._lock)
       self.rw = self
    
    def __enter__(self):
        self._lock.acquire()
        while True:
            reading = self.ro.reading
            if reading > 0:
                self._lock.release()
                time.sleep(1)
                self._lock.acquire()
            elif reading < 0:
                self._lock.release()
                raise RuntimeError()
            else:
                return
    
    def __exit__(self, exc_type, exc_value, traceback):
        self._lock.release()

class LeaderboardServer:
    def __init__(self):
        self.server_address = REPO
        self.repo_type = "dataset"
        self.local_leaderboard = snapshot_download(
            self.server_address,
            repo_type=self.repo_type,
            token=HF_TOKEN,
            local_dir="./",
        )
        self.TASKS_METADATA = json.load(open(TASKS_METADATA_PATH))
        self.TASKS_CATEGORIES = {self.TASKS_METADATA[task]["category"] for task in self.TASKS_METADATA}
        self.TASKS_CATEGORY_OVERALL = "Overall"
        
        self.var_lock = ReadWriteLock()
        self.submission_ids = set()
        self.submission_id_to_file = {}  # Map submission ids to file paths
        self.fetch_existing_models()
        self.tournament_results = self.load_tournament_results()
        
        self.pre_submit_lock = pre_submit_lock
        self.pre_submit = None

    def update_leaderboard(self):
        self.local_leaderboard = snapshot_download(
            self.server_address,
            repo_type=self.repo_type,
            token=HF_TOKEN,
            local_dir="./",
        )
        self.fetch_existing_models()
        
        with self.var_lock.rw:
            self.tournament_results = self.load_tournament_results()

    def load_tournament_results(self):
        metadata_rank_paths = os.path.join(self.local_leaderboard, "tournament.json")
        if not os.path.exists(metadata_rank_paths):
            return {}
        with open(metadata_rank_paths) as ranks_file:
            results = json.load(ranks_file)
        return results

    def fetch_existing_models(self):
        # Models data
        for submission_file in glob.glob(os.path.join(self.local_leaderboard, "data") + "/*.json"):
            data = json.load(open(submission_file))
            metadata = data.get('metadata')
            if metadata is None:
                continue
            submission_id = metadata["submission_id"]
            
            with self.var_lock.rw:
                self.submission_ids.add(submission_id)
                self.submission_id_to_file[submission_id] = submission_file

    def get_leaderboard(self, pre_submit=None, category=None):
        with self.var_lock.ro:
            tournament_results = pre_submit.tournament_results if pre_submit else self.tournament_results
            category = category if category else self.TASKS_CATEGORY_OVERALL

            if len(tournament_results) == 0:
                return pd.DataFrame(columns=['No submissions yet'])
            else:
                processed_results = []
                for submission_id in tournament_results.keys():
                    path = self.submission_id_to_file.get(submission_id)
                    if path is None:
                        if pre_submit and submission_id == pre_submit.submission_id:
                            data = json.load(open(pre_submit.file))
                        else:
                            raise gr.Error(f"Internal error: Submission [{submission_id}] not found")
                    elif path:
                        data = json.load(open(path))
                    else:
                        raise gr.Error(f"Submission [{submission_id}] not found")
                    
                    if submission_id != data["metadata"]["submission_id"]:
                        raise gr.Error(f"Proper submission [{submission_id}] not found")

                    local_results = {}
                    win_score = {}
                    visible_metrics_map_word_to_header = {}
                    for task in self.TASKS_METADATA.keys():
                        
                        task_category = self.TASKS_METADATA[task]["category"]
                        if category not in (self.TASKS_CATEGORY_OVERALL, task_category):
                            continue
                        else:
                            # tournament_results
                            num_of_competitors = 0
                            num_of_wins = 0
                            for competitor_id in tournament_results[submission_id].keys() - {submission_id}: # without self
                                num_of_competitors += 1
                                if tournament_results[submission_id][competitor_id][task]:
                                    num_of_wins += 1
                            task_score = num_of_wins / num_of_competitors * 100 if num_of_competitors > 0 else 100
                            win_score.setdefault(task_category, []).append(task_score)
                            
                            if category == task_category:
                                local_results[task] = task_score
                                for metric in VISIBLE_METRICS:
                                    visible_metrics_map_word_to_header[task + "_" + metric] = self.TASKS_METADATA[task]["abbreviation"] + " " + metric
                                    metric_value = data['results'][task].get(metric)
                                    if metric_value is not None:
                                        local_results[task + "_" + metric] = metric_value * 100
                                        break  # Only the first metric of every task
                    
                    
                    for c in win_score:
                        win_score[c] = sum(win_score[c]) / len(win_score[c])
                    
                    if category == self.TASKS_CATEGORY_OVERALL:
                        for c in win_score:
                            local_results[c] = win_score[c]
                        local_results["average_score"] = sum(win_score.values()) / len(win_score)
                    else:
                        local_results["average_score"] = win_score[category]
                    
                    model_link = data["metadata"]["link_to_model"]
                    model_title = data["metadata"]["team_name"] + "/" + data["metadata"]["model_name"]
                    model_title_abbr = self.abbreviate(data["metadata"]["team_name"], 14) + "/" + self.abbreviate(data["metadata"]["model_name"], 14)
                    local_results["model"] = f'<a href={xmlQuoteAttr(model_link)} title={xmlQuoteAttr(model_title)}>{xmlEscape(model_title_abbr, MARKDOWN_SPECIAL_CHARACTERS)}</a>'
                    release = data["metadata"].get("submission_timestamp")
                    release = time.strftime("%Y-%m-%d", time.gmtime(release)) if release else "N/A"
                    local_results["release"] = release
                    local_results["model_type"] = data["metadata"]["model_type"]
                    local_results["parameters"] = data["metadata"]["parameters"]
                    
                    if pre_submit and submission_id == pre_submit.submission_id:
                        processed_results.insert(0, local_results)
                    else:
                        processed_results.append(local_results)
                dataframe = pd.DataFrame.from_records(processed_results)
                
                extra_attributes_map_word_to_header = {
                    "model": "Model",
                    "release": "Release",
                    "average_score": "Average ⬆️",
                    "team_name": "Team name",
                    "model_name": "Model name",
                    "model_type": "Type",
                    "parameters": "# θ (B)",
                    "input_length": "Input length (# tokens)",
                    "precision": "Precision",
                    "description": "Description",
                    "link_to_model": "Link to model"
                }
                first_attributes = [
                    "model",
                    "release",
                    "model_type",
                    "parameters",
                    "average_score",
                ]
                df_order = [
                    key
                    for key in dict.fromkeys(
                        first_attributes
                        + list(self.TASKS_METADATA.keys())
                        + list(dataframe.columns)
                    ).keys()
                    if key in dataframe.columns
                ]
                dataframe = dataframe[df_order]
                attributes_map_word_to_header = {key: value["abbreviation"] for key, value in self.TASKS_METADATA.items()}
                attributes_map_word_to_header.update(extra_attributes_map_word_to_header)
                attributes_map_word_to_header.update(visible_metrics_map_word_to_header)
                dataframe = dataframe.rename(
                    columns=attributes_map_word_to_header
                )
                return dataframe

    def start_tournament(self, new_submission_id, new_model_file):
        with self.var_lock.ro:
            new_tournament = copy.deepcopy(self.tournament_results)
            new_tournament[new_submission_id] = {}
            new_tournament[new_submission_id][new_submission_id] = {
                task: False for task in self.TASKS_METADATA.keys()
            }
            
            rest_of_competitors = list(self.submission_ids - {new_submission_id})  # without self
            num_of_competitors = len(rest_of_competitors)
            
            result_url = {}
            result_inverse_url = {}
            
            while rest_of_competitors:
                next_competitors = []
                while rest_of_competitors:
                    if len(next_competitors) < 5:  # 5*2==10 tasks
                        next_competitors.append(rest_of_competitors.pop())
                    else:
                        break
                
                for competitor_id in next_competitors:
                    result_url[competitor_id] = check_significance_send_task(new_model_file, self.submission_id_to_file[competitor_id])
                    result_inverse_url[competitor_id] = check_significance_send_task(self.submission_id_to_file[competitor_id], new_model_file)
                
                while next_competitors:
                    competitor_id = next_competitors.pop(0)
                    result = check_significance_wait_for_result(result_url.pop(competitor_id))
                    result_inverse = check_significance_wait_for_result(result_inverse_url.pop(competitor_id))
                    
                    if rest_of_competitors:
                        new_competitor_id = rest_of_competitors.pop()
                        next_competitors.append(new_competitor_id)
                        result_url[new_competitor_id] = check_significance_send_task(new_model_file, self.submission_id_to_file[new_competitor_id])
                        result_inverse_url[new_competitor_id] = check_significance_send_task(self.submission_id_to_file[new_competitor_id], new_model_file)
                    
                    new_tournament[new_submission_id][competitor_id] = {
                        task: data["significant"] for task, data in result.items()
                    }
                    new_tournament[competitor_id][new_submission_id] = {
                        task: data["significant"] for task, data in result_inverse.items()
                    }
                    
                    num_of_competitors_done = num_of_competitors - len(next_competitors) - len(rest_of_competitors)
                    gr.Info(f"Tournament: {num_of_competitors_done}/{num_of_competitors} = {(num_of_competitors_done) * 100 // num_of_competitors}% done")
        
        return new_tournament

    @staticmethod
    def abbreviate(s, max_length, dots_place="center"):
        if len(s) <= max_length:
            return s
        else:
            if max_length <= 1:
                return "…"
            elif dots_place == "begin":
                return "…" + s[-max_length + 1:].lstrip()
            elif dots_place == "center" and max_length >= 3:
                max_length_begin = max_length // 2
                max_length_end = max_length - max_length_begin - 1
                return s[:max_length_begin].rstrip() + "…" + s[-max_length_end:].lstrip()
            else:  # dots_place == "end"
                return s[:max_length - 1].rstrip() + "…"

    @staticmethod
    def create_submission_id(metadata):
        # Délka ID musí být omezena, protože se používá v názvu souboru
        submission_id = "_".join([metadata[key][:7] for key in (
            "team_name",
            "model_name",
            "model_predictions_sha256",
            "model_results_sha256",
        )])
        submission_id = submission_id.replace("/", "_").replace("\n", "_").strip()
        return submission_id

    @staticmethod
    def get_sha256_hexdigest(obj):
        data = json.dumps(
            obj,
            separators=(',', ':'),
            sort_keys=True,
            ensure_ascii=True,
        ).encode()
        result = hashlib.sha256(data).hexdigest()
        return result
    
    PreSubmit = namedtuple('PreSubmit', 'tournament_results, submission_id, file')
    
    def prepare_model_for_submission(self, file, metadata) -> PreSubmit:
        with open(file, "r") as f:
            data = json.load(f)
        
        data["metadata"] = metadata
        
        metadata["model_predictions_sha256"] = self.get_sha256_hexdigest(data["predictions"])
        metadata["model_results_sha256"] = self.get_sha256_hexdigest(data["results"])
        
        submission_id = self.create_submission_id(metadata)
        metadata["submission_id"] = submission_id
        
        metadata["submission_timestamp"] = time.time()  # timestamp
        
        with open(file, "w") as f:
            json.dump(data, f, separators=(',', ':'))  # compact JSON
        
        while True:
            with self.pre_submit_lock:
                if self.pre_submit == None:
                    gr.Info('Running tournament...', duration=15)
                    self.update_leaderboard()
                    tournament_results = self.start_tournament(submission_id, file)
                    self.pre_submit = self.PreSubmit(tournament_results, submission_id, file)
                    break
            gr.Info("Waiting in queue...", duration=5)
            time.sleep(10)
        
        return self.pre_submit

    def save_pre_submit(self):
        with self.pre_submit_lock:
            if self.pre_submit:
                tournament_results, submission_id, file = self.pre_submit
                
                api.upload_file(
                    path_or_fileobj=file,
                    path_in_repo=f"data/{submission_id}.json",
                    repo_id=self.server_address,
                    repo_type=self.repo_type,
                    token=HF_TOKEN,
                )

                # Temporary save tournament results
                tournament_results_path = os.path.join(self.local_leaderboard, "tournament.json")
                with open(tournament_results_path, "w") as f:
                    json.dump(tournament_results, f, sort_keys=True, indent=2)  # readable JSON

                api.upload_file(
                    path_or_fileobj=tournament_results_path,
                    path_in_repo="tournament.json",
                    repo_id=self.server_address,
                    repo_type=self.repo_type,
                    token=HF_TOKEN,
                )
                
                self.pre_submit = None

    def get_model_detail(self, submission_id):
        with self.var_lock.ro:
            path = self.submission_id_to_file.get(submission_id)
        if path is None:
            raise gr.Error(f"Submission [{submission_id}] not found")
        data = json.load(open(path))
        return data["metadata"]