"""Utility functions for all event stream to SPADL converters.

A converter should implement 'convert_to_actions' to convert the events to the
SPADL format.

"""

import pandas as pd  # type: ignore

from . import config as spadlconfig


def _fix_clearances(actions: pd.DataFrame) -> pd.DataFrame:
    next_actions = actions.shift(-1)
    next_actions[-1:] = actions[-1:]
    clearance_idx = actions.type_id == spadlconfig.actiontypes.index("clearance")
    actions.loc[clearance_idx, "end_x"] = next_actions[clearance_idx].start_x.values
    actions.loc[clearance_idx, "end_y"] = next_actions[clearance_idx].start_y.values

    return actions


def _fix_direction_of_play(actions: pd.DataFrame, home_team_id: int) -> pd.DataFrame:
    away_idx = (actions.team_id != home_team_id).values
    for col in ["start_x", "end_x"]:
        actions.loc[away_idx, col] = spadlconfig.field_length - actions[away_idx][col].values
    for col in ["start_y", "end_y"]:
        actions.loc[away_idx, col] = spadlconfig.field_width - actions[away_idx][col].values

    return actions


min_dribble_length: float = 3.0
max_dribble_length: float = 60.0
max_dribble_duration: float = 10.0


def _add_dribbles(actions: pd.DataFrame) -> pd.DataFrame:
    next_actions = actions.shift(-1, fill_value=0)

    same_team = actions.team_id == next_actions.team_id
    # not_clearance = actions.type_id != actiontypes.index("clearance")
    not_offensive_foul = same_team & (
        next_actions.type_id != spadlconfig.actiontypes.index("foul")
    )
    not_headed_shot = (next_actions.type_id != spadlconfig.actiontypes.index("shot")) & (
        next_actions.bodypart_id != spadlconfig.bodyparts.index("head")
    )

    dx = actions.end_x - next_actions.start_x
    dy = actions.end_y - next_actions.start_y
    far_enough = dx**2 + dy**2 >= min_dribble_length**2
    not_too_far = dx**2 + dy**2 <= max_dribble_length**2

    dt = next_actions.time_seconds - actions.time_seconds
    same_phase = dt < max_dribble_duration
    same_period = actions.period_id == next_actions.period_id

    dribble_idx = (
        same_team
        & far_enough
        & not_too_far
        & same_phase
        & same_period
        & not_offensive_foul
        & not_headed_shot
    )

    dribbles = pd.DataFrame()
    prev = actions[dribble_idx]
    nex = next_actions[dribble_idx]
    dribbles["game_id"] = nex.game_id
    dribbles["period_id"] = nex.period_id
    dribbles["action_id"] = prev.action_id + 0.1
    dribbles["time_seconds"] = (prev.time_seconds + nex.time_seconds) / 2
    if "timestamp" in actions.columns:
        dribbles["timestamp"] = nex.timestamp
    dribbles["team_id"] = nex.team_id
    dribbles["player_id"] = nex.player_id
    dribbles["start_x"] = prev.end_x
    dribbles["start_y"] = prev.end_y
    dribbles["end_x"] = nex.start_x
    dribbles["end_y"] = nex.start_y
    dribbles["bodypart_id"] = spadlconfig.bodyparts.index("foot")
    dribbles["type_id"] = spadlconfig.actiontypes.index("dribble")
    dribbles["result_id"] = spadlconfig.results.index("success")

    actions = pd.concat([actions, dribbles], ignore_index=True, sort=False)
    actions = actions.sort_values(["game_id", "period_id", "action_id"]).reset_index(drop=True)
    actions["action_id"] = range(len(actions))
    return actions