import sqlite3
import random
from wood import logger

from data.setup_database import DB_PATH

def validate_user_session(db_id, discord_id):
    """Prüft, ob das Cookie noch zur aktuellen Datenbank passt."""
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    cursor.execute("SELECT discord_id FROM players WHERE id = ?", (db_id,))
    result = cursor.fetchone()
    connection.close()

    # 1. Fall: Die ID gibt es gar nicht mehr in der Datenbank
    if result is None:
        return False

    # 2. Fall: Die ID gehört jetzt einem anderen Discord-Account (Datenbank wurde resettet)
    if str(result[0]) != str(discord_id):
        return False

    # 3. Fall: Alles ist korrekt!
    return True


def change_display_name(player_id, new_name):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    cursor.execute("UPDATE players SET display_name = ? WHERE id = ?", (new_name, player_id))

    connection.commit()
    connection.close()

def generate_silly_name():
    adjectives = ["Verwirrter", "Blinder", "Heulender", "Zorniger", "Chaos", "Verzweifelter", "Schreiender", "Stolpernder", "Schwitzender"]
    nouns = ["Grot", "Kultist", "Servitor", "Snotling", "Guardmen", "Würfellecker", "Regelvergesser", "Meta-Chaser", "Klebschnüffler"]
    adj = random.choice(adjectives)
    noun = random.choice(nouns)
    return f"{adj} {noun}"        


def get_or_create_player(discord_id, discord_name, avatar_url):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # fragen 4 Dinge ab (id, discord_name, display_name, discord_avatar_url)
    cursor.execute("SELECT id, discord_name, display_name, discord_avatar_url FROM players WHERE discord_id = ?", (discord_id,))
    player = cursor.fetchone()

    if player is None:
        # Random Silly Name Generator für neue Spieler. Damit sie angeregt werden ihren richtigen Namen einzutragen.
        silly_name = generate_silly_name()
        cursor.execute("INSERT INTO players (discord_id, discord_name, display_name, discord_avatar_url) VALUES (?, ?, ?, ?)", (discord_id, discord_name, silly_name, avatar_url))
        logger.log("NEW PLAYER", str("Ein neuer Spieler wurde angelegt  - " + discord_name))
        connection.commit()
        cursor.execute("SELECT id, discord_name, display_name, discord_avatar_url FROM players WHERE discord_id = ?", (discord_id,))
        player = cursor.fetchone()
    else:
        # Falls sich Name oder Bild auf Discord geändert haben, machen wir ein Update
        cursor.execute("UPDATE players SET discord_name = ?, discord_avatar_url = ? WHERE discord_id = ?", (discord_name, avatar_url, discord_id))
        connection.commit()

        cursor.execute("SELECT id, discord_name, display_name, discord_avatar_url FROM players WHERE discord_id = ?", (discord_id,))
        player = cursor.fetchone()

    connection.close()
    return player


def get_all_players():
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # Alle Spieler laden, absteigend sortiert nach MMR
    cursor.execute("SELECT id, name, mmr, points, games FROM players ORDER BY mmr DESC")
    players = cursor.fetchall()

    connection.close()

    # Die Daten für das Web-GUI in eine lesbare Form umwandeln (Liste von Dictionaries)
    result = []

    return result


def get_all_players_from_system(system_name):
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row
    cursor = connection.cursor()

    # ID und Namen der Spieler.
    # DISTINCT stellt sicher, dass jeder Spieler nur einmal vorkommt.
    query = """
        SELECT DISTINCT 
            p.id AS player_id, 
            p.display_name, 
            p.discord_name
        FROM players p
        JOIN player_game_statistic stat ON p.id = stat.player_id
        JOIN gamesystems sys ON stat.gamesystem_id = sys.id
        WHERE sys.name = ?
        ORDER BY p.display_name ASC
    """

    cursor.execute(query, (system_name,))
    rows = cursor.fetchall()
    connection.close()

    result = []
    for row in rows:
        result.append(dict(row))

    return result


def get_gamesystem_id_by_name(system_name):
    """Holt die interne ID eines Spielsystems anhand seines Namens (z.B. 'Warhammer 40k' -> 1)."""
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # Wir suchen exakt nach dem Namen
    cursor.execute("SELECT id FROM gamesystems WHERE name = ?", (system_name,))
    row = cursor.fetchone()

    connection.close()

    # Wenn wir einen Treffer haben, geben wir die erste Spalte (die ID) zurück
    if row:
        return row[0]

    # Wenn das System nicht existiert
    return None





def get_player_statistics(player_id):
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row 
    cursor = connection.cursor()

    query = """
        SELECT 
            sys.id AS gamesystem_id,
            sys.name AS gamesystem_name,
            sys.*, 
            stat.mmr,
            stat.games_in_system,
            stat.points
        FROM gamesystems sys
        LEFT JOIN player_game_statistic stat 
            ON sys.id = stat.gamesystem_id AND stat.player_id = ?
    """

    cursor.execute(query, (player_id,))
    rows = cursor.fetchall()
    connection.close()

    result = []
    for row in rows:
        result.append(dict(row))

    return result




def join_league(player_id, gamesystem_id):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # Wir fügen nur die beiden IDs ein, der Rest wird von den DEFAULT-Werten der DB erledigt
    query = """
        INSERT INTO player_game_statistic (player_id, gamesystem_id) 
        VALUES (?, ?)
    """
    logger.log("DataAPI", f"{get_player_name(player_id)} joined {gamesystem_id}", player_id)
    cursor.execute(query, (player_id, gamesystem_id))
    connection.commit()

    connection.close()



def get_recent_matches_for_player(player_id):
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row 
    cursor = connection.cursor()

    query = """
        SELECT 
            m.id AS match_id,
            sys.name AS gamesystem_name,
            m.player1_id,
            p1.display_name AS p1_display,
            p1.discord_name AS p1_discord,
            m.score_player1,
            m.player2_id,
            p2.display_name AS p2_display,
            p2.discord_name AS p2_discord,
            m.score_player2,
            m.played_at
        FROM matches m
        JOIN gamesystems sys ON m.gamesystem_id = sys.id
        JOIN players p1 ON m.player1_id = p1.id
        JOIN players p2 ON m.player2_id = p2.id
        WHERE m.player1_id = ? OR m.player2_id = ?
        ORDER BY m.played_at DESC
        LIMIT 10
    """

    cursor.execute(query, (player_id, player_id))
    rows = cursor.fetchall()
    connection.close()

    result = []
    for row in rows:
        result.append(dict(row))

    return result




def add_new_match(system_name, player1_id, player2_id, score_p1, score_p2):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # 1. Wir suchen die interne ID des Spielsystems anhand des Namens (z.B. "Warhammer 40k" -> 1)
    cursor.execute("SELECT id FROM gamesystems WHERE name = ?", (system_name,))
    sys_row = cursor.fetchone()

    # Sicherheitscheck (sollte eigentlich nie passieren)
    if not sys_row:
        connection.close()
        return None 

    sys_id = sys_row[0]

    # 2. Das Match eintragen! (Datum 'played_at' macht SQLite durch DEFAULT CURRENT_TIMESTAMP automatisch)
    query = """
        INSERT INTO matches (gamesystem_id, player1_id, player2_id, score_player1, score_player2)
        VALUES (?, ?, ?, ?, ?)
    """

    cursor.execute(query, (sys_id, player1_id, player2_id, score_p1, score_p2))
    new_match_id = cursor.lastrowid

    logger.log("DataAPI", f"{get_player_name(player1_id)}:({score_p1}) posted Match. System: {system_name}, {get_player_name(player2_id)}:({score_p2})", player1_id)

    connection.commit()
    connection.close()

    return new_match_id



def save_calculated_match(calc_results: dict):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    try:
        match_id   = calc_results["match_id"]
        winner_id  = calc_results["winner_id"]
        looser_id  = calc_results["looser_id"]

        # Match aus DB lesen
        cursor.execute(
            "SELECT player1_id, player2_id, gamesystem_id FROM matches WHERE id = ?",
            (match_id,)
        )
        row = cursor.fetchone()
        if not row:
            raise ValueError(f"Match ID {match_id} nicht in der Datenbank gefunden.")

        player1_id, player2_id, gamesystem_id = row

        # Daten der Spieler aus calc_results holen (Key = player_id als int/str)
        p1 = calc_results[player1_id]
        p2 = calc_results[player2_id]

        # 1. Match-Tabelle updaten
        match_query = """
            UPDATE matches
            SET
                player1_base_change  = ?, player1_khorne  = ?, player1_slaanesh  = ?,
                player1_tzeentch     = ?, player1_mmr_change = ?,
                player2_base_change  = ?, player2_khorne  = ?, player2_slaanesh  = ?,
                player2_tzeentch     = ?, player2_mmr_change = ?,
                rust_factor          = ?, elo_factor       = ?, point_inflation   = ?,
                match_is_counted     = 1
            WHERE id = ?
        """
        cursor.execute(match_query, (
            p1["base"], p1["khorne"], p1["slaanesh"], p1["tzeentch"], p1["total"],
            p2["base"], p2["khorne"], p2["slaanesh"], p2["tzeentch"], p2["total"],
            calc_results["rust_factor"], calc_results["elo_factor"], calc_results["point_inflation"],
            match_id
        ))

        # 2. Scores holen
        cursor.execute(
            "SELECT score_player1, score_player2 FROM matches WHERE id = ?",
            (match_id,)
        )
        score_row = cursor.fetchone()
        score_p1, score_p2 = score_row if score_row else (0, 0)

        # 3. Statistik-Query
        stat_query = """
            UPDATE player_game_statistic
            SET
                mmr              = mmr + ?,
                games_in_system  = games_in_system + 1,
                points           = points + ?,
                avv_points       = (points + ?) / (games_in_system + 1),
                last_played      = CURRENT_TIMESTAMP
            WHERE player_id = ? AND gamesystem_id = ?
        """

        # 4. Statistik Spieler 1
        cursor.execute(stat_query, (
            p1["total"], score_p1, score_p1,
            player1_id, gamesystem_id
        ))

        # 5. Statistik Spieler 2
        cursor.execute(stat_query, (
            p2["total"], score_p2, score_p2,
            player2_id, gamesystem_id
        ))

        connection.commit()
        logger.log("MATCH_CALC", f"Match ID {match_id} wurde komplett berechnet und verbucht.")
        return True

    except Exception as e:
        connection.rollback()
        print(f"KRITISCHER FEHLER beim Speichern des Matches: {e}")
        return False

    finally:
        connection.close()






# -----------------------------------------------------
# Get Data Funktionen
# -----------------------------------------------------   
def get_gamesystem_data(system_id):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()
    cursor.execute("SELECT * FROM gamesystems WHERE id = ?", (system_id,))
    row = cursor.fetchone()
    connection.close()
    return dict(zip([col[0] for col in cursor.description], row)) if row else None





def get_gamesystems_data():
    connection = sqlite3.connect(DB_PATH)

    connection.row_factory = sqlite3.Row 
    cursor = connection.cursor()

    cursor.execute("SELECT * FROM gamesystems")
    rows = cursor.fetchall()
    connection.close()

    # SQLite-Rows in normale Python-Dictionaries um
    result = []
    for row in rows:
        result.append(dict(row))

    return result



def get_leaderboard(system_name):
    """Holt alle Spieler eines Systems sortiert nach MMR für die Rangliste."""
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row
    cursor = connection.cursor()

    # WIR HABEN HIER EINE BEDINGUNG HINZUGEFÜGT: AND stat.games_in_system > 0
    # Dadurch filtert die Datenbank direkt auf dem Server schon alle "0-Spiele"-Accounts raus.
    query = """
        SELECT p.id, p.display_name, p.discord_name, stat.mmr
        FROM players p
        JOIN player_game_statistic stat ON p.id = stat.player_id
        JOIN gamesystems sys ON stat.gamesystem_id = sys.id
        WHERE sys.name = ? AND stat.games_in_system > 0
        ORDER BY stat.mmr DESC
    """

    cursor.execute(query, (system_name,))
    rows = cursor.fetchall()
    connection.close()

    result = []
    for row in rows:
        result.append(dict(row))

    return result


def get_match_by_id(match_id: int) -> dict | None:
    """Gibt alle Match-Daten inkl. Gamesystem-Name als Dict zurück."""
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    try:
        cursor.execute("""
            SELECT
                m.id,
                m.gamesystem_id,
                g.name AS gamesystem_name,
                m.player1_id,
                m.score_player1,
                m.player2_id,
                m.score_player2,
                m.played_at
            FROM matches m
            JOIN gamesystems g ON m.gamesystem_id = g.id
            WHERE m.id = ?
        """, (match_id,))

        row = cursor.fetchone()
        if not row:
            return None

        columns = [desc[0] for desc in cursor.description]
        return dict(zip(columns, row))

    except Exception as e:
        print(f"Fehler beim Laden des Matches: {e}")
        return None

    finally:
        connection.close()


def get_player_name(player_id):
    """Gibt den Namen eines Spielers im Format 'Anzeigename (Discordname)' zurück."""

    # Sicherheits-Check: Falls aus Versehen gar keine ID übergeben wird
    if player_id is None:
        return "Unbekannter Spieler"

    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    cursor.execute("SELECT display_name, discord_name FROM players WHERE id = ?", (player_id,))
    row = cursor.fetchone()
    connection.close()

    # Wenn die Datenbank den Spieler gefunden hat:
    if row:
        display_name = row[0]
        discord_name = row[1]
        return f"{display_name} ({discord_name})"
    else:
        return "Gelöschter Spieler"


def get_system_name(sys_id):
    if sys_id is None:
        return "Unbekanntes System"
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()
    cursor.execute("SELECT name FROM gamesystems WHERE id = ?", (sys_id,))

    row = cursor.fetchone()
    connection.close()

    if row:
        return row[0]
    else:
        return "Gelöschtes System"




def get_days_since_last_system_game(player_id, gamesystem_id):
    """Gibt zurück, wie viele Tage das letzte Spiel in einem bestimmten System her ist."""
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # Julianday() berechnet in SQLite die Differenz in Tagen zwischen zwei Daten
    query = """
        SELECT CAST(julianday('now') - julianday(last_played) AS INTEGER) 
        FROM player_game_statistic 
        WHERE player_id = ? AND gamesystem_id = ?
    """
    cursor.execute(query, (player_id, gamesystem_id))
    result = cursor.fetchone()
    connection.close()

    # Wenn er gefunden wurde und ein Datum hat, gib die Tage zurück. Sonst (Erstes Spiel) 0.
    if result and result[0] is not None:
        return result[0]
    return 0




# -----------------------------------------------------
# Matches Bestätigen, Löschen, Berechnen, ...
# -----------------------------------------------------   

def get_unconfirmed_matches(player_id):
    """Holt alle offenen Matches, die der Spieler noch bestätigen muss."""
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row
    cursor = connection.cursor()

    # Wir joinen players (für den Namen des Gegners) und gamesystems (für den Systemnamen)
    query = """
        SELECT m.id AS match_id, m.score_player1, m.score_player2, m.played_at,
               sys.name AS system_name,
               p1.display_name AS p1_name
        FROM matches m
        JOIN gamesystems sys ON m.gamesystem_id = sys.id
        JOIN players p1 ON m.player1_id = p1.id
        WHERE m.player2_id = ? AND m.player2_check = 0
    """

    cursor.execute(query, (player_id,))
    rows = cursor.fetchall()
    connection.close()

    # Wir geben eine Liste mit Dictionaries zurück
    return [dict(row) for row in rows]


def delete_match(match_id, player_id):
    """Löscht ein Match anhand seiner ID komplett aus der Datenbank."""
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # DELETE FROM löscht die gesamte Zeile, bei der die ID übereinstimmt.
    cursor.execute("DELETE FROM matches WHERE id = ?", (match_id,))
    logger.log("data_api.delete_match", f"Match mit ID{match_id} von User gelöscht.", f"{player_id}")
    connection.commit()
    connection.close()


def confirm_match(match_id):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # Ändert nur die Spalte player2_check auf 1 (True)
    cursor.execute("UPDATE matches SET player2_check = 1 WHERE id = ?", (match_id,))
    logger.log("data_api.confirm_match", f"Match mit ID{match_id} von Player2 bestätigt.")
    connection.commit()
    connection.close()


def set_match_counted(match_id):
    """Setzt den Haken (1), dass das Match erfolgreich in die MMR eingeflossen ist."""
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # Ändert nur die Spalte match_is_counted auf 1 (True)
    cursor.execute("UPDATE matches SET match_is_counted = 1 WHERE id = ?", (match_id,))
    logger.log("data_api.set_match_counted", f"Match mit ID: {match_id} berechnet.")
    connection.commit()
    connection.close()


def get_submitted_matches(player_id):
    """Holt alle offenen Matches, die der Spieler selbst eingetragen hat, aber vom Gegner noch nicht bestätigt wurden."""
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row
    cursor = connection.cursor()

    # ACHTUNG: Wir joinen hier p2 (player2), weil wir den Namen des Gegners anzeigen wollen!
    query = """
        SELECT m.id AS match_id, m.score_player1, m.score_player2, m.played_at,
               sys.name AS system_name,
               p2.display_name AS p2_name
        FROM matches m
        JOIN gamesystems sys ON m.gamesystem_id = sys.id
        JOIN players p2 ON m.player2_id = p2.id
        WHERE m.player1_id = ? AND m.player2_check = 0
    """

    cursor.execute(query, (player_id,))
    rows = cursor.fetchall()
    connection.close()

    return [dict(row) for row in rows]


def get_match_history_log(player_id):
    """Holt ALLE Matches eines Spielers inklusive der MMR-Änderungen für das Log."""
    connection = sqlite3.connect(DB_PATH)
    connection.row_factory = sqlite3.Row
    cursor = connection.cursor()

    query = """
        SELECT m.played_at, sys.name AS gamesystem_name,
               m.player1_id, p1.display_name AS p1_display, p1.discord_name AS p1_discord, m.score_player1, m.player1_mmr_change,
               m.player2_id, p2.display_name AS p2_display, p2.discord_name AS p2_discord, m.score_player2, m.player2_mmr_change,
               m.player2_check, m.match_is_counted
        FROM matches m
        JOIN gamesystems sys ON m.gamesystem_id = sys.id
        JOIN players p1 ON m.player1_id = p1.id
        JOIN players p2 ON m.player2_id = p2.id
        WHERE m.player1_id = ? OR m.player2_id = ?
        ORDER BY m.played_at DESC
    """
    cursor.execute(query, (player_id, player_id))
    rows = cursor.fetchall()
    connection.close()

    return [dict(row) for row in rows]





# -----------------------------------------------------
# Testing and Prototyping
# -----------------------------------------------------   
def create_random_dummy_match(player_id):
    connection = sqlite3.connect(DB_PATH)
    cursor = connection.cursor()

    # 1. Die ID des Dummys suchen (Wir suchen einfach nach dem Namen 'Dummy')
    cursor.execute("SELECT id FROM players WHERE display_name LIKE '%Dummy%' OR discord_name LIKE '%Dummy%' LIMIT 1")
    dummy_row = cursor.fetchone()

    if not dummy_row:
        connection.close()
        print("Fehler: Kein Dummy in der Datenbank gefunden!")
        return False
    dummy_id = dummy_row[0]
    # 2. Zufällige Punkte generieren (z.B. zwischen 0 und 100)
    score_p1 = random.randint(0, 100)
    score_p2 = random.randint(0, 100)
    # 3. Das Match hart in System 1 (gamesystem_id = 1) eintragen
    query = """
        INSERT INTO matches (gamesystem_id, player2_id, player1_id, score_player1, score_player2, player2_check)
        VALUES (?, ?, ?, ?, ?, 0)
    """
    cursor.execute(query, (1, player_id, dummy_id, score_p1, score_p2))

    connection.commit()
    connection.close()

    p1_name = get_player_name(player_id)
    dummy_name = get_player_name(dummy_id)
    sys_name = get_system_name(1)

    logger.log("TEST_MATCH", f"Zufallsspiel generiert. [{sys_name}]: {p1_name} ({score_p1}) vs. {dummy_name} ({score_p2})", player_id)

    return True