import typing
import warnings
from pathlib import Path
from typing import cast

from lang_main.analysis.graphs import TokenGraph
from lang_main.constants import (
    DO_GRAPH_POSTPROCESSING,
    DO_PREPROCESSING,
    DO_TIME_ANALYSIS,
    DO_TOKEN_ANALYSIS,
    INPUT_PATH_FOLDER,
    PATH_TO_DATASET,
    SAVE_PATH_FOLDER,
    SKIP_GRAPH_POSTPROCESSING,
    SKIP_PREPROCESSING,
    SKIP_TIME_ANALYSIS,
    SKIP_TOKEN_ANALYSIS,
    THRESHOLD_AMOUNT_CHARACTERS,
    THRESHOLD_EDGE_WEIGHT,
)
from lang_main.io import create_saving_folder, load_pickle
from lang_main.pipelines.predefined import (
    pipe_merge,
    pipe_target_feat,
    pipe_timeline,
    pipe_token_analysis,
)
from lang_main.types import (
    ObjectID,
    TimelineCandidates,
)
from pandas import DataFrame, Series


# ** processing pipeline
def run_preprocessing() -> DataFrame:
    create_saving_folder(
        saving_path_folder=SAVE_PATH_FOLDER,
        overwrite_existing=True,
    )
    # run pipelines
    ret = typing.cast(
        tuple[DataFrame], pipe_target_feat.run(starting_values=(PATH_TO_DATASET,))
    )
    target_feat_data = ret[0]
    # only entries with more than threshold amount of characters
    data_filter = typing.cast(Series, (target_feat_data['len'] > THRESHOLD_AMOUNT_CHARACTERS))
    subset_data = target_feat_data.loc[data_filter].copy()
    # merge duplicates, results saved separately
    ret = typing.cast(tuple[DataFrame], pipe_merge.run(starting_values=(subset_data,)))
    preprocessed_data = ret[0]

    return preprocessed_data


def run_token_analysis(
    preprocessed_data: DataFrame,
) -> TokenGraph:
    # build token graph
    (tk_graph,) = typing.cast(
        tuple[TokenGraph], pipe_token_analysis.run(starting_values=(preprocessed_data,))
    )
    tk_graph.save_graph(SAVE_PATH_FOLDER, directed=False)
    tk_graph.to_pickle(SAVE_PATH_FOLDER, filename=f'{pipe_token_analysis.name}-TokenGraph')

    return tk_graph


def run_graph_postprocessing(
    tk_graph: TokenGraph,
) -> TokenGraph:
    # filter graph by edge weight and remove single nodes (no connection)
    tk_graph_filtered = tk_graph.filter_by_edge_weight(THRESHOLD_EDGE_WEIGHT)
    tk_graph_filtered = tk_graph_filtered.filter_by_node_degree(1)
    tk_graph_filtered.save_graph(
        SAVE_PATH_FOLDER, filename='TokenGraph-filtered', directed=False
    )
    tk_graph_filtered.to_pickle(
        SAVE_PATH_FOLDER, filename=f'{pipe_token_analysis.name}-TokenGraph-filtered'
    )

    return tk_graph_filtered


def run_time_analysis() -> tuple[TimelineCandidates, dict[ObjectID, str]]:
    filename = 'without_nan'
    loading_path = INPUT_PATH_FOLDER.joinpath(filename).with_suffix('.pkl')
    verify_path(loading_path)
    ret = load_pickle(loading_path)
    preprocessed_data = ret[0]

    ret = cast(
        tuple[TimelineCandidates, dict[ObjectID, str]],
        pipe_timeline.run(starting_values=(preprocessed_data,)),
    )
    return ret


def verify_path(
    loading_path: Path,
) -> None:
    if not loading_path.exists():
        raise FileNotFoundError(f'Could not load results. File not found: {loading_path}')


def main() -> None:
    pre_step_skipped: bool = False
    # ** preprocess
    if DO_PREPROCESSING and not SKIP_PREPROCESSING:
        preprocessed_data = run_preprocessing()
    elif not SKIP_PREPROCESSING:
        # !! hardcoded result filenames
        target_pattern: str = r'*Pipe-Merge_Duplicates_Step-1*'
        loading_path = list(SAVE_PATH_FOLDER.glob(target_pattern))[0]
        verify_path(loading_path)
        ret = typing.cast(tuple[DataFrame], load_pickle(loading_path))
        preprocessed_data = ret[0]
    else:
        pre_step_skipped = True
        warnings.warn('No preprocessing action selected. Skipped.')
    # sys.exit(0)
    # ** token analysis
    if DO_TOKEN_ANALYSIS and not SKIP_TOKEN_ANALYSIS:
        if pre_step_skipped:
            raise RuntimeError(
                'Preprocessing step skipped. Token analysis cannot be performed.'
            )
        preprocessed_data_trunc = typing.cast(
            DataFrame, preprocessed_data[['entry', 'num_occur']].copy()
        )  # type: ignore
        tk_graph = run_token_analysis(preprocessed_data_trunc)
    elif not SKIP_TOKEN_ANALYSIS:
        # !! hardcoded result filenames
        # whole graph
        filename: str = f'{pipe_token_analysis.name}-TokenGraph'
        loading_path = SAVE_PATH_FOLDER.joinpath(filename).with_suffix('.pkl')
        verify_path(loading_path)
        # tk_graph = typing.cast(TokenGraph, load_pickle(loading_path))
        tk_graph = TokenGraph.from_pickle(loading_path)
        pre_step_skipped = False
    else:
        pre_step_skipped = True
        warnings.warn('No token analysis action selected. Skipped.')
    # ** graph postprocessing
    if DO_GRAPH_POSTPROCESSING and not SKIP_GRAPH_POSTPROCESSING:
        if pre_step_skipped:
            raise RuntimeError(
                (
                    'Preprocessing or token analysis step skipped. '
                    'Graph postprocessing cannot be performed.'
                )
            )
        tk_graph_filtered = run_graph_postprocessing(tk_graph)
    elif not SKIP_GRAPH_POSTPROCESSING:
        # !! hardcoded result filenames
        # filtered graph
        filename: str = f'{pipe_token_analysis.name}-TokenGraph-filtered'
        loading_path = SAVE_PATH_FOLDER.joinpath(filename).with_suffix('.pkl')
        verify_path(loading_path)
        # tk_graph_filtered = typing.cast(TokenGraph, load_pickle(loading_path))
        tk_graph_filtered = TokenGraph.from_pickle(loading_path)
        pre_step_skipped = False
    else:
        warnings.warn('No graph postprocessing action selected. Skipped.')
    # ** time analysis
    if DO_TIME_ANALYSIS and not SKIP_TIME_ANALYSIS:
        # no check for fails, runs separately
        ret = run_time_analysis()
    elif not SKIP_TIME_ANALYSIS:
        ...
    else:
        warnings.warn('No time analysis action selected. Skipped.')


if __name__ == '__main__':
    main()