import os, json, re, jsonpickle
import sqlite3 as sql

data_dir = "data"
league_dir = "leagues"
statements_file = os.path.join(data_dir, "sql_statements.xvi")

def create_connection(league_name):
    #create connection, create db if doesn't exist
    conn = None
    try:
        if not os.path.exists(os.path.join(data_dir, league_dir, league_name)):
        
            os.makedirs(os.path.join(data_dir, league_dir, league_name))
        conn = sql.connect(os.path.join(data_dir, league_dir, league_name, f"{league_name}.db"))

        # enable write-ahead log for performance and resilience
        conn.execute('pragma journal_mode=wal')

        modifications_table_check_string = """ CREATE TABLE IF NOT EXISTS mods (
                                                counter integer PRIMARY KEY,
                                                name text NOT NULL,
                                                team_name text NOT NULL,
                                                modifications_json text
                                            );"""
        conn.execute(modifications_table_check_string)

        return conn
    except:
        print("oops, db connection no work")
        return conn

def statements():
    if not os.path.exists(os.path.dirname(statements_file)):
        os.makedirs(os.path.dirname(statements_file))
    if not os.path.exists(statements_file):
        #generate default statements: bat_base and pitch_base to be appended with a relevant ORDER BY statement
        config_dic = {
                "bat_base" : """SELECT name, team_name,
	plate_appearances - (walks_taken + sacrifices) as ABs, 
	ROUND(hits*1.0 / (plate_appearances - (walks_taken + sacrifices)*1.0),3) as BA,
	ROUND(total_bases*1.0 / (plate_appearances - (walks_taken + sacrifices)*1.0),3) as SLG,
	ROUND((walks_taken + hits)*1.0/plate_appearances*1.0,3) as OBP,
	ROUND((walks_taken + hits)*1.0/plate_appearances*1.0,3) + ROUND(total_bases*1.0 / (plate_appearances - (walks_taken + sacrifices)*1.0),3) as OPS
FROM stats WHERE plate_appearances > """,
                "bat_base_req": 3,
                "avg" : ["ORDER BY BA DESC;", "bat_base"],
                "slg" : ["ORDER BY SLG DESC;", "bat_base"],
                "obp" : ["ORDER BY OBP DESC;", "bat_base"],
                "ops" : ["ORDER BY OPS DESC;", "bat_base"],
                "bat_count_base": "SELECT name, team_name,\n\tplate_appearances - (walks_taken + sacrifices) as ABs,\nwalks_taken as BB,\nhits as H,\nhome_runs as HR,\nrbis as RBIs,\nstrikeouts_taken as K,\nsacrifices\nFROM stats WHERE plate_appearances > 8",
	            "home runs": ["ORDER BY HR DESC;", "bat_count_base"],
	            "walks drawn": ["ORDER BY BB DESC;", "bat_count_base"],
                "bat_count_base_req" : 3,
                "pitch_base" : """SELECT name, team_name,
    ROUND(((outs_pitched*1.0)/3.0),1) as IP,
	ROUND(runs_allowed*27.0/(outs_pitched*1.0),3) as ERA,
	ROUND((walks_allowed+hits_allowed)*3.0/(outs_pitched*1.0),3) as WHIP,
	ROUND(walks_allowed*27.0/(outs_pitched*1.0),3) as BBper9,
	ROUND(strikeouts_given*27.0/(outs_pitched*1.0),3) as Kper9,
	ROUND(strikeouts_given*1.0/walks_allowed*1.0,3) as KperBB
FROM stats WHERE outs_pitched > 
""",
                "pitch_base_req": 2,
                "era" : ["ORDER BY ERA ASC;", "pitch_base"],
                "whip" : ["ORDER BY WHIP ASC;", "pitch_base"],
                "kper9" : ["ORDER BY Kper9 DESC;", "pitch_base"],
                "bbper9" : ["ORDER BY BBper9 ASC;", "pitch_base"],
                "kperbb" : ["ORDER BY KperBB DESC;", "pitch_base"]
            }
        with open(statements_file, "w") as config_file:
            json.dump(config_dic, config_file, indent=4)
            return config_dic
    else:
        with open(statements_file) as config_file:
            return json.load(config_file)

def create_season_connection(league_name, season_num):
    #create connection, create db if doesn't exist
    conn = None
    try:
        if not os.path.exists(os.path.join(data_dir, league_dir, league_name)):
        
            os.makedirs(os.path.join(data_dir, league_dir, league_name))
        conn = sql.connect(os.path.join(data_dir, league_dir, league_name, season_num, f"{league_name}.db"))

        # enable write-ahead log for performance and resilience
        conn.execute('pragma journal_mode=wal')

        return conn
    except:
        print("oops, db connection no work")
        return conn

def state(league_name):
    if not os.path.exists(os.path.dirname(os.path.join(data_dir, league_dir, league_name, f"{league_name}.state"))):
            os.makedirs(os.path.dirname(os.path.join(data_dir, league_dir, league_name, f"{league_name}.state")))
    with open(os.path.join(data_dir, league_dir, league_name, f"{league_name}.state")) as state_file:
        return json.load(state_file)

def init_league_db(league):
    if os.path.exists(os.path.join(data_dir, league_dir, league.name, f"{league.name}.db")):
        os.remove(os.path.join(data_dir, league_dir, league.name, f"{league.name}.db"))

    conn = create_connection(league.name)

    player_stats_table_check_string = """ CREATE TABLE IF NOT EXISTS stats (
                                            counter integer PRIMARY KEY,
                                            id text,
                                            name text,
                                            team_name text,
                                            outs_pitched integer DEFAULT 0,
                                            walks_allowed integer DEFAULT 0,
                                            hits_allowed integer DEFAULT 0,
                                            strikeouts_given integer DEFAULT 0,
                                            runs_allowed integer DEFAULT 0,
                                            plate_appearances integer DEFAULT 0,
                                            walks_taken integer DEFAULT 0,
                                            sacrifices integer DEFAULT 0,
                                            hits integer DEFAULT 0,
                                            home_runs integer DEFAULT 0,
                                            total_bases integer DEFAULT 0,
                                            rbis integer DEFAULT 0,
                                            strikeouts_taken integer DEFAULT 0
                                            );"""

    teams_table_check_string = """ CREATE TABLE IF NOT EXISTS teams (
                                            counter integer PRIMARY KEY,
                                            name text NOT NULL,
                                            wins integer DEFAULT 0,
                                            losses integer DEFAULT 0,
                                            run_diff integer DEFAULT 0
                                        ); """

    modifications_table_check_string = """ CREATE TABLE IF NOT EXISTS mods (
                                                counter integer PRIMARY KEY,
                                                name text NOT NULL,
                                                team_name text NOT NULL,
                                                modifications_json text
                                            );"""

    if conn is not None:
        c = conn.cursor()
        c.execute(player_stats_table_check_string)
        c.execute(teams_table_check_string)
        c.execute(modifications_table_check_string)

        for team in league.teams_in_league():
            c.execute("INSERT INTO teams (name) VALUES (?)", (team.name,))

            player_string = "INSERT INTO stats (name, team_name) VALUES (?,?)"
            for batter in team.lineup:
                c.execute(player_string, (batter.name, team.name))
            for pitcher in team.rotation:
                c.execute(player_string, (pitcher.name, team.name))

    conn.commit()
    conn.close()

def save_league(league):
    if league_exists(league.name):
        state_dic = {
                "season" : league.season,
                "day" : league.day,
                "subs" : league.subbed_channels,
                "last_weather_event" : league.last_weather_event_day,
                "constraints" : league.constraints,
                "game_length" : league.game_length,
                "series_length" : league.series_length,
                "games_per_hour" : league.games_per_hour,
                "owner" : league.owner,
                "champion" : league.champion,
                "schedule" : league.schedule,
                "forecasts" : league.weather_forecast,              
                "historic" : league.historic
            }
        with open(os.path.join(data_dir, league_dir, league.name, f"{league.name}.state"), "w") as state_file:
            json.dump(state_dic, state_file, indent=4)

def add_stats(league_name, player_game_stats_list):
    conn = create_connection(league_name)
    if conn is not None:
        c=conn.cursor()
        for team_name in player_game_stats_list.keys():
            for (name, player_stats_dic) in player_game_stats_list[team_name]:
                c.execute("SELECT * FROM stats WHERE name=? AND team_name=?",(name, team_name))
                this_player = c.fetchone()
                if this_player is not None:
                    for stat in player_stats_dic.keys():
                        c.execute(f"SELECT {stat} FROM stats WHERE name=? AND team_name=?",(name, team_name))
                        old_value = int(c.fetchone()[0])
                        c.execute(f"UPDATE stats SET {stat} = ? WHERE name=? AND team_name=?",(player_stats_dic[stat]+old_value, name, team_name))
                else:
                    c.execute("INSERT INTO stats(name) VALUES (?)",(name,))
                    for stat in player_stats_dic.keys():
                        c.execute(f"UPDATE stats SET {stat} = ? WHERE name=? AND team_name=?",(player_stats_dic[stat], name, team_name))
        conn.commit()
    conn.close()

def get_stats(league_name, stat, is_batter=True, day = 10):
    conn = create_connection(league_name)
    stats = None
    if conn is not None:
        conn.row_factory = sql.Row
        c=conn.cursor()

        if stat in statements().keys():
            req_number = str(day * int(statements()[statements()[stat][1]+"_req"]))
            c.execute(statements()[statements()[stat][1]]+req_number+"\n"+statements()[stat][0])
            stats = c.fetchall()
    conn.close()
    return stats

def get_mods(league_name, player:str, team:str):
    """returns a player's modifications dict"""
    conn = create_connection(league_name)
    if conn is not None:
        c = conn.cursor()
        c.execute("SELECT * FROM stats WHERE name=? AND team_name=?", (player, team)) #check stats table to make sure player actually exists in the league
        row = c.fetchone()
        if row is None:
            return False
        c.execute("SELECT modifications_json FROM mods WHERE name=? AND team_name=?", (player, team))
        mod_string = c.fetchone()
        if mod_string is None:
            return None
        mods = json.loads(mod_string[0])
        conn.close()
        return mods
    return False

def get_team_mods(league_name, team:str):
    """returns a dictionary of player modifications belonging to a team"""
    conn = create_connection(league_name)
    if conn is not None:
        c = conn.cursor()
        c.execute("SELECT * FROM stats WHERE team_name=?", (team,)) #check stats table to make sure team actually exists in the league
        row = c.fetchone()
        if row is None:
            return False
        c.execute("SELECT name, modifications_json FROM mods WHERE team_name=?",(team,))
        rows = c.fetchall()
        if len(rows) == 0:
            return None
        mods_dic = {}
        for row in rows:
            mods_dic[row[0]] = json.loads(row[1])
        return mods_dic

def set_mods(league_name, player:str, team:str, modifications:dict):
    """Overwrites a player's modifications with an entirely new set"""
    conn = create_connection(league_name)
    if conn is not None:
        c = conn.cursor()
        c.execute("SELECT * FROM stats WHERE name=? AND team_name=?", (player, team)) #check stats table to make sure player actually exists in the league
        row = c.fetchone()
        if row is None:
            return False
        mod_string = json.dumps(modifications)
        c.execute("SELECT counter FROM mods WHERE name=? AND team_name=?", (player, team)) #check stats table to make sure player actually exists in the league
        counter = c.fetchone()
        if counter is None:
            c.execute("INSERT INTO mods(name, team_name, modifications_json) VALUES (?,?,?)", (player, team, mod_string))
        else:
            c.execute("UPDATE mods SET modifications_json = ? WHERE counter=?", (mod_string, counter))
        conn.commit()
        conn.close
        return True
    return False

def update_standings(league_name, update_dic):
    if league_exists(league_name):
        conn = create_connection(league_name)
        if conn is not None:
            c = conn.cursor()

            for team_name in update_dic.keys():
                for stat_type in update_dic[team_name].keys(): #wins, losses, run_diff
                    c.execute(f"SELECT {stat_type} FROM teams WHERE name = ?", (team_name,))
                    old_value = int(c.fetchone()[0])
                    c.execute(f"UPDATE teams SET {stat_type} = ? WHERE name = ?", (update_dic[team_name][stat_type]+old_value, team_name))
            conn.commit()
        conn.close()

def get_standings(league_name):
    if league_exists(league_name):
        conn = create_connection(league_name)
        if conn is not None:
            c = conn.cursor()

            c.execute("SELECT name, wins, losses, run_diff FROM teams",)
            standings_array = c.fetchall()
            conn.close()
            return standings_array

def season_save(league):
    if league_exists(league.name):
        seasons = 1
        with os.scandir(os.path.join(data_dir, league_dir, league.name)) as folder:
            for item in folder:
                if "." not in item.name:
                    seasons += 1
            new_dir = os.path.join(data_dir, league_dir, league.name, str(seasons))
            os.makedirs(new_dir)
        with os.scandir(os.path.join(data_dir, league_dir, league.name)) as folder:
            for item in folder:
                if "." in item.name:
                    os.rename(os.path.join(data_dir, league_dir, league.name, item.name), os.path.join(new_dir, item.name))

def season_restart(league):
    if league_exists(league.name):
        with os.scandir(os.path.join(data_dir, league_dir, league.name)) as folder:
            for item in folder:
                if "." in item.name:
                    os.remove(os.path.join(data_dir, league_dir, league.name, item.name))

def get_past_standings(league_name, season_num):
    if league_exists(league_name):
         with os.scandir(os.path.join(data_dir, league_dir, league_name)) as folder:
            for item in folder:
                if item.name == str(season_num):
                    conn = create_season_connection(league_name, str(item.name))
                    if conn is not None:
                        c = conn.cursor()

                        c.execute("SELECT name, wins, losses, run_diff FROM teams",)
                        standings_array = c.fetchall()
                        conn.close()
                        return standings_array

def get_past_champion(league_name, season_num):
    if league_exists(league_name):
         with os.scandir(os.path.join(data_dir, league_dir, league_name)) as folder:
            for item in folder:
                if item.name == str(season_num):
                    with open(os.path.join(data_dir, league_dir, league_name, item.name, f"{league_name}.state")) as state_file:
                        state_dic = json.load(state_file)
                        return state_dic["champion"]

def league_exists(league_name):
    with os.scandir(os.path.join(data_dir, league_dir)) as folder:
        for subfolder in folder:
            if league_name == subfolder.name:
                with os.scandir(subfolder.path) as league_folder:
                    for item in league_folder:
                        if item.name == f"{league_name}.db":
                            return True
    return False