import os
from pathlib import Path
from functools import lru_cache
from dotenv import load_dotenv

load_dotenv()

# ─── Paths ───────────────────────────────────────────────
ROOT_DIR               = Path(__file__).resolve().parent.parent
DATA_DIR               = ROOT_DIR / "data"
TMP_DIR                = Path("/tmp")
DOWNLOAD_DIR           = DATA_DIR / "downloads"
USERS_DIR              = DATA_DIR / "users"
ENV                    = os.getenv("APP_ENV", "development")
PROXY_LIST_FILE        = Path(os.getenv("PROXY_LIST_FILE", ".50.txt"))
# ─── Additional ───────────────────────────────────────────────
PROXY_USERNAME         = os.getenv("PROXY_USERNAME")
PROXY_PASSWORD         = os.getenv("PROXY_PASSWORD")
# ─── DB and SQLAlchemy ───────────────────────────────────────────
SQLALCHEMY_DATABASE_URI= os.getenv("DATABASE_URL") or f"sqlite:///{DATA_DIR / 'local.db'}"
DB_POOL_SIZE           = int(os.getenv("DB_POOL_SIZE", 20))
DB_ECHO                = bool(os.getenv("DB_ECHO", False))
# ─── Concurrency ───────────────────────────────────────────────
CPU_COUNT              = os.cpu_count() or 2
THREADS_MAX            = min(32, CPU_COUNT * 4)
PROCS_MAX              = min(CPU_COUNT, 4)
PER_IP_CONCURRENCY     = int(os.getenv("PER_IP_CONCURRENCY", 2))
# ─── Cache and Tuning knobs ──────────────────────────────────────
FORMAT_CACHE_TTL_SEC   = int(os.getenv("FORMAT_CACHE_TTL_SEC",   8_000))
DOWNLOAD_CACHE_TTL_SEC = int(os.getenv("DOWNLOAD_CACHE_TTL_SEC", 86_400)) # 24h
PARALLEL_CHUNK_MB      = int(os.getenv("PARALLEL_CHUNK_MB",      2))
MAX_CONCURRENT_FRAG    = int(os.getenv("MAX_CONCURRENT_FRAG",    4))
ARIA2C_THRESHOLD_MB    = int(os.getenv("ARIA2C_THRESHOLD_MB",    512))
MIN_SCORE              = float(os.getenv("PROXY_MIN_SCORE", "0.05"))
MAX_IN_USE             = int(os.getenv("PROXY_CONCURRENCY_LIMIT", "4"))
FAIL_COOLDOWN_SEC      = int(os.getenv("PROXY_FAIL_COOLDOWN", "600"))
_MAX_LOGIN_FAILS       = int(os.getenv("MAX_LOGIN_FAILS", "12"))
_MAX_INVALID_URLS      = int(os.getenv("MAX_INVALID_URLS", "20"))
_WINDOW_MINUTES        = int(os.getenv("WINDOW_MINUTES", "60"))
# ─── Logging ───────────────────────────────────────────────────
LOG_LEVEL              = os.getenv("LOG_LEVEL", "INFO")
# ─── db ───────────────────────────────────────────────────
SKIP_SCHEMA_BOOTSTRAP  = int(os.getenv("SKIP_SCHEMA_BOOTSTRAP","0"))
@lru_cache
def ensure_dirs() -> None:
    for p in (DATA_DIR, USERS_DIR, DOWNLOAD_DIR):
        p.mkdir(parents=True, exist_ok=True)
ensure_dirs()