#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Speichersystem (JSON-Savegames) und persistente Meta-Statistiken fuer den
Loop-Twist: das Spiel 'erinnert' sich, wie oft es schon gespielt wurde."""

import json
import os

from doom_matrix.entities.player import Player

_SAVE_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "saves")
_META_PATH = os.path.join(_SAVE_DIR, "meta.json")

_DEFAULT_META = {"run_count": 0, "completed_runs": 0, "endings_seen": []}


def _ensure_dir():
    os.makedirs(_SAVE_DIR, exist_ok=True)


def save_game(player, slot="autosave"):
    _ensure_dir()
    path = os.path.join(_SAVE_DIR, f"{slot}.json")
    with open(path, "w", encoding="utf-8") as f:
        json.dump(player.to_dict(), f, ensure_ascii=False, indent=2)
    return path


def load_game(slot="autosave"):
    path = os.path.join(_SAVE_DIR, f"{slot}.json")
    if not os.path.exists(path):
        return None
    with open(path, "r", encoding="utf-8") as f:
        data = json.load(f)
    return Player.from_dict(data)


def save_exists(slot="autosave"):
    return os.path.exists(os.path.join(_SAVE_DIR, f"{slot}.json"))


def load_meta():
    if not os.path.exists(_META_PATH):
        return dict(_DEFAULT_META)
    try:
        with open(_META_PATH, "r", encoding="utf-8") as f:
            data = json.load(f)
        merged = dict(_DEFAULT_META)
        merged.update(data)
        return merged
    except (json.JSONDecodeError, OSError):
        return dict(_DEFAULT_META)


def save_meta(meta):
    _ensure_dir()
    with open(_META_PATH, "w", encoding="utf-8") as f:
        json.dump(meta, f, ensure_ascii=False, indent=2)


def register_new_run():
    meta = load_meta()
    meta["run_count"] += 1
    save_meta(meta)
    return meta["run_count"]


def register_ending(ending_key):
    meta = load_meta()
    meta["completed_runs"] += 1
    if ending_key not in meta["endings_seen"]:
        meta["endings_seen"].append(ending_key)
    save_meta(meta)
    return meta


def loop_twist_line(run_count):
    """Gibt einen Dialogzeile zurueck, falls das Spiel schon oefter gelaufen ist -- oder None."""
    if run_count <= 1:
        return None
    if run_count == 2:
        return "Morpheus: 'Habe ich das hier nicht schon einmal gesagt?'"
    if run_count < 5:
        return f"Morpheus: 'Lauf Nummer {run_count}. Du wirst besser. Oder ich erinnere mich besser.'"
    return f"Morpheus: 'Lauf Nummer {run_count}. Ehrlich gesagt -- ich weiss nicht mehr, welcher von uns beiden real ist.'"