from __future__ import annotations

import json
import os
import secrets
from pathlib import Path


def _default_data_dir() -> Path:
    return Path(os.getenv("SALDO_DATA_DIR", Path.cwd() / "instance")).resolve()


class Config:
    APP_NAME = "Saldo"
    SECRET_KEY = os.getenv("SECRET_KEY") or secrets.token_hex(32)
    DATA_DIR = _default_data_dir()
    AVATAR_UPLOAD_DIR = DATA_DIR / "avatars"
    SQLALCHEMY_DATABASE_URI = os.getenv(
        "DATABASE_URL",
        f"sqlite:///{(DATA_DIR / 'saldo.db').as_posix()}",
    )
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    REMEMBER_COOKIE_DURATION = 60 * 60 * 24 * 30
    MAX_CONTENT_LENGTH = int(os.getenv("SALDO_MAX_CONTENT_LENGTH", str(5 * 1024 * 1024)))
    SESSION_COOKIE_HTTPONLY = True
    SESSION_COOKIE_SAMESITE = "Lax"
    REMEMBER_COOKIE_HTTPONLY = True
    REMEMBER_COOKIE_SAMESITE = "Lax"
    SESSION_COOKIE_SECURE = os.getenv("SALDO_SESSION_COOKIE_SECURE", "0") != "0"
    REMEMBER_COOKIE_SECURE = SESSION_COOKIE_SECURE
    CSRF_ENABLED = os.getenv("SALDO_CSRF_ENABLED", "1") != "0"

    VAPID_PUBLIC_KEY = os.getenv("VAPID_PUBLIC_KEY", "")
    VAPID_PRIVATE_KEY = os.getenv("VAPID_PRIVATE_KEY", "")
    VAPID_CLAIMS = {
        "sub": os.getenv("VAPID_SUBJECT", "mailto:admin@example.invalid"),
    }

    ADMIN_BOOTSTRAP_USERNAME = os.getenv("SALDO_ADMIN_USERNAME", "admin")
    ADMIN_BOOTSTRAP_PASSWORD = os.getenv("SALDO_ADMIN_PASSWORD", "")
    ADMIN_BOOTSTRAP_EMAIL = os.getenv("SALDO_ADMIN_EMAIL", "admin@example.invalid")

    ALLOCATION_TARGET_RULES = json.loads(
        os.getenv(
            "SALDO_ALLOCATION_TARGET_RULES",
            json.dumps(
                {
                    "sparen": {
                        "recommended_pct": 0.18,
                        "min_pct": 0.15,
                        "max_pct": 0.20,
                        "label": "Sparen",
                    },
                    "urlaub": {
                        "recommended_pct": 0.06,
                        "min_pct": 0.05,
                        "max_pct": 0.08,
                        "label": "Urlaub",
                    },
                    "freizeit": {
                        "recommended_pct": 0.07,
                        "min_pct": 0.05,
                        "max_pct": 0.10,
                        "label": "Freizeit",
                    },
                }
            ),
        )
    )
    DEFAULT_PERSONAL_SPLIT_DESI_PCT = float(
        os.getenv("SALDO_DEFAULT_PERSONAL_SPLIT_DESI_PCT", "50")
    )
    STRONG_INCOME_CHANGE_THRESHOLD = float(
        os.getenv("SALDO_STRONG_INCOME_CHANGE_THRESHOLD", "150")
    )