import hashlib
import json
import re
from datetime import datetime, timezone
from pathlib import Path

import pandas as pd

from src.models import TaskType
from src.benchmarks import LongDocBenchmarks, QABenchmarks
from src.display.columns import get_default_col_names_and_types, get_fixed_col_names_and_types
from src.display.formatting import styled_error, styled_message
from src.envs import (
    API,
    COL_NAME_AVG,
    COL_NAME_IS_ANONYMOUS,
    COL_NAME_RANK,
    COL_NAME_RERANKING_MODEL,
    COL_NAME_RETRIEVAL_MODEL,
    COL_NAME_REVISION,
    COL_NAME_TIMESTAMP,
    LATEST_BENCHMARK_VERSION,
    SEARCH_RESULTS_REPO,
)


def calculate_mean(row):
    if pd.isna(row).any():
        return -1
    else:
        return row.mean()


def remove_html(input_str):
    # Regular expression for finding HTML tags
    clean = re.sub(r"<.*?>", "", input_str)
    return clean


def filter_models(df: pd.DataFrame, reranking_query: list) -> pd.DataFrame:
    if not reranking_query:
        return df
    else:
        return df.loc[df[COL_NAME_RERANKING_MODEL].apply(remove_html).isin(reranking_query)]


def filter_queries(query: str, df: pd.DataFrame) -> pd.DataFrame:
    filtered_df = df.copy()
    final_df = []
    if query != "":
        queries = [q.strip() for q in query.split(";")]
        for _q in queries:
            _q = _q.strip()
            if _q != "":
                temp_filtered_df = search_table(filtered_df, _q)
                if len(temp_filtered_df) > 0:
                    final_df.append(temp_filtered_df)
        if len(final_df) > 0:
            filtered_df = pd.concat(final_df)
            filtered_df = filtered_df.drop_duplicates(
                subset=[
                    COL_NAME_RETRIEVAL_MODEL,
                    COL_NAME_RERANKING_MODEL,
                ]
            )
    return filtered_df


def search_table(df: pd.DataFrame, query: str) -> pd.DataFrame:
    return df[(df[COL_NAME_RETRIEVAL_MODEL].str.contains(query, case=False))]


def get_default_cols(task: TaskType, version_slug, add_fix_cols: bool = True) -> tuple:
    cols = []
    types = []
    if task == TaskType.qa:
        benchmarks = QABenchmarks[version_slug]
    elif task == TaskType.long_doc:
        benchmarks = LongDocBenchmarks[version_slug]
    else:
        raise NotImplementedError
    cols_list, types_list = get_default_col_names_and_types(benchmarks)
    benchmark_list = [c.value.col_name for c in list(benchmarks.value)]
    for col_name, col_type in zip(cols_list, types_list):
        if col_name not in benchmark_list:
            continue
        cols.append(col_name)
        types.append(col_type)
    if add_fix_cols:
        _cols = []
        _types = []
        fixed_cols, fixed_cols_types = get_fixed_col_names_and_types()
        for col_name, col_type in zip(cols, types):
            if col_name in fixed_cols:
                continue
            _cols.append(col_name)
            _types.append(col_type)
        cols = fixed_cols + _cols
        types = fixed_cols_types + _types
    return cols, types


def select_columns(
    df: pd.DataFrame,
    domain_query: list,
    language_query: list,
    task: TaskType = TaskType.qa,
    reset_ranking: bool = True,
    version_slug: str = None,
) -> pd.DataFrame:
    cols, _ = get_default_cols(task=task, version_slug=version_slug, add_fix_cols=False)
    selected_cols = []
    for c in cols:
        if task == TaskType.qa:
            eval_col = QABenchmarks[version_slug].value[c].value
        elif task == TaskType.long_doc:
            eval_col = LongDocBenchmarks[version_slug].value[c].value
        else:
            raise NotImplementedError
        if eval_col.domain not in domain_query:
            continue
        if eval_col.lang not in language_query:
            continue
        selected_cols.append(c)
    # We use COLS to maintain sorting
    fixed_cols, _ = get_fixed_col_names_and_types()
    filtered_df = df[fixed_cols + selected_cols]
    filtered_df.replace({"": pd.NA}, inplace=True)
    if reset_ranking:
        filtered_df[COL_NAME_AVG] = filtered_df[selected_cols].apply(calculate_mean, axis=1).round(decimals=2)
        filtered_df.sort_values(by=[COL_NAME_AVG], ascending=False, inplace=True)
        filtered_df.reset_index(inplace=True, drop=True)
        filtered_df = reset_rank(filtered_df)

    return filtered_df


def get_safe_name(name: str):
    """Get RFC 1123 compatible safe name"""
    name = name.replace("-", "_")
    return "".join(character.lower() for character in name if (character.isalnum() or character == "_"))


def _update_df_elem(
    task: TaskType,
    version: str,
    source_df: pd.DataFrame,
    domains: list,
    langs: list,
    reranking_query: list,
    query: str,
    show_anonymous: bool,
    reset_ranking: bool = True,
    show_revision_and_timestamp: bool = False,
):
    version_slug = get_safe_name(version)[-4:]
    filtered_df = source_df.copy()
    if not show_anonymous:
        filtered_df = filtered_df[~filtered_df[COL_NAME_IS_ANONYMOUS]]
    filtered_df = filter_models(filtered_df, reranking_query)
    filtered_df = filter_queries(query, filtered_df)
    filtered_df = select_columns(filtered_df, domains, langs, task, reset_ranking, version_slug)
    if not show_revision_and_timestamp:
        filtered_df.drop([COL_NAME_REVISION, COL_NAME_TIMESTAMP], axis=1, inplace=True)
    return filtered_df


def update_doc_df_elem(
    version: str,
    hidden_df: pd.DataFrame,
    domains: list,
    langs: list,
    reranking_query: list,
    query: str,
    show_anonymous: bool,
    show_revision_and_timestamp: bool = False,
    reset_ranking: bool = True,
):
    return _update_df_elem(
        TaskType.long_doc,
        version,
        hidden_df,
        domains,
        langs,
        reranking_query,
        query,
        show_anonymous,
        reset_ranking,
        show_revision_and_timestamp,
    )


def update_metric(
    datastore,
    task: TaskType,
    metric: str,
    domains: list,
    langs: list,
    reranking_model: list,
    query: str,
    show_anonymous: bool = False,
    show_revision_and_timestamp: bool = False,
) -> pd.DataFrame:
    if task == TaskType.qa:
        update_func = update_qa_df_elem
    elif task == TaskType.long_doc:
        update_func = update_doc_df_elem
    else:
        raise NotImplemented
    df_elem = get_leaderboard_df(datastore, task=task, metric=metric)
    version = datastore.version
    return update_func(
        version,
        df_elem,
        domains,
        langs,
        reranking_model,
        query,
        show_anonymous,
        show_revision_and_timestamp,
    )


def upload_file(filepath: str):
    if not filepath.endswith(".zip"):
        print(f"file uploading aborted. wrong file type: {filepath}")
        return filepath
    return filepath


def get_iso_format_timestamp():
    # Get the current timestamp with UTC as the timezone
    current_timestamp = datetime.now(timezone.utc)

    # Remove milliseconds by setting microseconds to zero
    current_timestamp = current_timestamp.replace(microsecond=0)

    # Convert to ISO 8601 format and replace the offset with 'Z'
    iso_format_timestamp = current_timestamp.isoformat().replace("+00:00", "Z")
    filename_friendly_timestamp = current_timestamp.strftime("%Y%m%d%H%M%S")
    return iso_format_timestamp, filename_friendly_timestamp


def calculate_file_md5(file_path):
    md5 = hashlib.md5()

    with open(file_path, "rb") as f:
        while True:
            data = f.read(4096)
            if not data:
                break
            md5.update(data)

    return md5.hexdigest()


def submit_results(
    filepath: str,
    model: str,
    model_url: str,
    reranking_model: str = "",
    reranking_model_url: str = "",
    version: str = LATEST_BENCHMARK_VERSION,
    is_anonymous=False,
):
    if not filepath.endswith(".zip"):
        return styled_error(f"file uploading aborted. wrong file type: {filepath}")

    # validate model
    if not model:
        return styled_error("failed to submit. Model name can not be empty.")

    # validate model url
    if not is_anonymous:
        if not model_url.startswith("https://") and not model_url.startswith("http://"):
            # TODO: retrieve the model page and find the model name on the page
            return styled_error(
                f"failed to submit. Model url must start with `https://` or `http://`. Illegal model url: {model_url}"
            )
        if reranking_model != "NoReranker":
            if not reranking_model_url.startswith("https://") and not reranking_model_url.startswith("http://"):
                return styled_error(
                    f"failed to submit. Model url must start with `https://` or `http://`. Illegal model url: {model_url}"
                )

    # rename the uploaded file
    input_fp = Path(filepath)
    revision = calculate_file_md5(filepath)
    timestamp_config, timestamp_fn = get_iso_format_timestamp()
    output_fn = f"{timestamp_fn}-{revision}.zip"
    input_folder_path = input_fp.parent

    if not reranking_model:
        reranking_model = "NoReranker"

    API.upload_file(
        path_or_fileobj=filepath,
        path_in_repo=f"{version}/{model}/{reranking_model}/{output_fn}",
        repo_id=SEARCH_RESULTS_REPO,
        repo_type="dataset",
        commit_message=f"feat: submit {model} to evaluate",
    )

    output_config_fn = f"{output_fn.removesuffix('.zip')}.json"
    output_config = {
        "model_name": f"{model}",
        "model_url": f"{model_url}",
        "reranker_name": f"{reranking_model}",
        "reranker_url": f"{reranking_model_url}",
        "version": f"{version}",
        "is_anonymous": is_anonymous,
        "revision": f"{revision}",
        "timestamp": f"{timestamp_config}",
    }
    with open(input_folder_path / output_config_fn, "w") as f:
        json.dump(output_config, f, indent=4, ensure_ascii=False)
    API.upload_file(
        path_or_fileobj=input_folder_path / output_config_fn,
        path_in_repo=f"{version}/{model}/{reranking_model}/{output_config_fn}",
        repo_id=SEARCH_RESULTS_REPO,
        repo_type="dataset",
        commit_message=f"feat: submit {model} + {reranking_model} config",
    )
    return styled_message(
        f"Thanks for submission!\n"
        f"Retrieval method: {model}\nReranking model: {reranking_model}\nSubmission revision: {revision}"
    )


def reset_rank(df):
    df[COL_NAME_RANK] = df[COL_NAME_AVG].rank(ascending=False, method="min")
    return df


def get_leaderboard_df(datastore, task: TaskType, metric: str) -> pd.DataFrame:
    """
    Creates a dataframe from all the individual experiment results
    """
    raw_data = datastore.raw_data
    cols = [
        COL_NAME_IS_ANONYMOUS,
    ]
    if task == TaskType.qa:
        benchmarks = QABenchmarks[datastore.slug]
    elif task == TaskType.long_doc:
        benchmarks = LongDocBenchmarks[datastore.slug]
    else:
        raise NotImplementedError
    cols_qa, _ = get_default_col_names_and_types(benchmarks)
    cols += cols_qa
    benchmark_cols = [t.value.col_name for t in list(benchmarks.value)]
    all_data_json = []
    for v in raw_data:
        all_data_json += v.to_dict(task=task.value, metric=metric)
    df = pd.DataFrame.from_records(all_data_json)

    _benchmark_cols = frozenset(benchmark_cols).intersection(frozenset(df.columns.to_list()))

    # calculate the average score for selected benchmarks
    df[COL_NAME_AVG] = df[list(_benchmark_cols)].apply(calculate_mean, axis=1).round(decimals=2)
    df.sort_values(by=[COL_NAME_AVG], ascending=False, inplace=True)
    df.reset_index(inplace=True, drop=True)

    _cols = frozenset(cols).intersection(frozenset(df.columns.to_list()))
    df = df[_cols].round(decimals=2)

    # filter out if any of the benchmarks have not been produced
    df[COL_NAME_RANK] = df[COL_NAME_AVG].rank(ascending=False, method="min")

    # shorten the revision
    df[COL_NAME_REVISION] = df[COL_NAME_REVISION].str[:6]

    # # replace "0" with "-" for average score
    # df[COL_NAME_AVG] = df[COL_NAME_AVG].replace(0, "-")
    return df


def set_listeners(
    task: TaskType,
    target_df,
    source_df,
    search_bar,
    version,
    selected_domains,
    selected_langs,
    selected_rerankings,
    show_anonymous,
    show_revision_and_timestamp,
):
    if task == TaskType.qa:
        update_table_func = update_qa_df_elem
    elif task == TaskType.long_doc:
        update_table_func = update_doc_df_elem
    else:
        raise NotImplementedError
    selector_list = [selected_domains, selected_langs, selected_rerankings, search_bar, show_anonymous]
    search_bar_args = [
        source_df,
        version,
    ] + selector_list
    selector_args = (
        [version, source_df]
        + selector_list
        + [
            show_revision_and_timestamp,
        ]
    )
    # Set search_bar listener
    search_bar.submit(update_table_func, search_bar_args, target_df)

    # Set column-wise listener
    for selector in selector_list:
        selector.change(
            update_table_func,
            selector_args,
            target_df,
            queue=True,
        )


def update_qa_df_elem(
    version: str,
    hidden_df: pd.DataFrame,
    domains: list,
    langs: list,
    reranking_query: list,
    query: str,
    show_anonymous: bool,
    show_revision_and_timestamp: bool = False,
    reset_ranking: bool = True,
):
    return _update_df_elem(
        TaskType.qa,
        version,
        hidden_df,
        domains,
        langs,
        reranking_query,
        query,
        show_anonymous,
        reset_ranking,
        show_revision_and_timestamp,
    )