import os
from dotenv import load_dotenv, find_dotenv

# ─── Load .env from project root or any parent ────────────────────────────────
dotenv_path = find_dotenv()
if dotenv_path:
    load_dotenv(dotenv_path, override=True)

# ─── Paths ────────────────────────────────────────────────────────────────────
CONFIG_DIR   = os.path.dirname(os.path.abspath(__file__))
PROJECT_ROOT = os.path.dirname(CONFIG_DIR)

class Config:
    # ─── Environment ─────────────────────────────────────────────────────────────
    ENV = (
        os.getenv('FLASK_ENV')
        or os.getenv('DOCKER_ENV')
        or 'production'
    ).lower()

    # ─── Secret Key ──────────────────────────────────────────────────────────────
    if ENV == 'production':
        SECRET_KEY = os.getenv('SECRET_KEY')
        if not SECRET_KEY:
            raise RuntimeError(
                "SECRET_KEY environment variable not set! "
                "Generate one with `openssl rand -hex 32` and export it."
            )
    else:
        # dev/test: fall back to env or a random one
        SECRET_KEY = os.getenv('SECRET_KEY') or os.urandom(24).hex()

    # ─── Uploads ────────────────────────────────────────────────────────────────
    # Default to PROJECT_ROOT/static/uploads; if UPLOAD_FOLDER env is set, resolve relative to PROJECT_ROOT
    _env_upload = os.getenv('UPLOAD_FOLDER', '')
    if _env_upload:
        # if absolute, use directly; otherwise join to project root
        UPLOAD_FOLDER = _env_upload if os.path.isabs(_env_upload) else os.path.join(PROJECT_ROOT, _env_upload)
    else:
        UPLOAD_FOLDER = os.path.join(PROJECT_ROOT, "static", "uploads")

    MAX_CONTENT_LENGTH = int(os.getenv('MAX_CONTENT_LENGTH', 20 * 1024**3))
    ALLOWED_EXTENSIONS  = {'png', 'jpg', 'jpeg', 'gif'}

    # ─── Celery ────────────────────────────────────────────────────────────────
    CELERY_BROKER_URL     = os.getenv('CELERY_BROKER_URL')
    if not CELERY_BROKER_URL:
        raise RuntimeError("CELERY_BROKER_URL environment variable not set!")
    CELERY_RESULT_BACKEND = os.getenv('CELERY_RESULT_BACKEND', CELERY_BROKER_URL)

    # ─── MySQL ──────────────────────────────────────────────────────────────────
    MYSQL_USER     = os.getenv('MYSQL_USER')
    MYSQL_PASSWORD = os.getenv('MYSQL_PASSWORD')
    if not MYSQL_PASSWORD:
        raise RuntimeError("MYSQL_PASSWORD environment variable not set!")
    MYSQL_HOST     = os.getenv('MYSQL_HOST', 'db')
    MYSQL_PORT     = int(os.getenv('MYSQL_PORT', 3306))
    MYSQL_DATABASE = os.getenv('MYSQL_DATABASE')
    if not MYSQL_DATABASE:
        raise RuntimeError("MYSQL_DATABASE environment variable not set!")

    SQLALCHEMY_DATABASE_URI        = (
        f"mysql+pymysql://{MYSQL_USER}:{MYSQL_PASSWORD}"
        f"@{MYSQL_HOST}:{MYSQL_PORT}/{MYSQL_DATABASE}"
    )
    SQLALCHEMY_TRACK_MODIFICATIONS = False

    # ─── Cookies / Session ──────────────────────────────────────────────────────
    SESSION_COOKIE_SECURE    = True
    SESSION_COOKIE_HTTPONLY  = True
    SESSION_COOKIE_SAMESITE  = 'Lax'
    REMEMBER_COOKIE_SECURE   = True
    REMEMBER_COOKIE_HTTPONLY = True
    REMEMBER_COOKIE_SAMESITE = 'Lax'
    PREFERRED_URL_SCHEME     = 'https'

    # ─── Toggles ────────────────────────────────────────────────────────────────
    ENABLE_DB_SEEDING = os.getenv('ENABLE_DB_SEEDING', '0') == '1'
    DOCKER_ENV        = os.getenv('DOCKER_ENV', 'production')

    # ─── Neo4j ──────────────────────────────────────────────────────────────────
    NEO4J_URI      = os.getenv('NEO4J_URI', 'bolt://neo4j:7687')
    NEO4J_USER     = os.getenv('NEO4J_USER', 'neo4j')
    NEO4J_PASSWORD = os.getenv('NEO4J_PASSWORD')
    if not NEO4J_PASSWORD:
        raise RuntimeError("NEO4J_PASSWORD environment variable not set!")

    # ─── Misc ──────────────────────────────────────────────────────────────────
    STANDARD_IMG_SIZE = tuple(
        map(int, os.getenv('STANDARD_IMG_SIZE', '300x200').split('x'))
    )
    PLANT_CARDS_BASE_URL = "https://plant.cards"
    ALLOW_REGISTRATION   = False