from typing import TypedDict
from pathlib import Path
import os

from server.Server import Server

class RunConfig(TypedDict):
  host: str
  port: int
  debug: bool

def env_bool(name:str, default:bool=False) -> bool:
  value = os.environ.get(name)
  if value is None:
    return default
  return value.lower() in {'1', 'true', 'yes', 'on'}

def build_server_from_env(default_snake_type:str) -> Server:
  data_path = str(Path(__file__).resolve().parent.parent)
  game_state_backend = os.environ.get('GAME_STATE_BACKEND', 'memory')
  game_state_redis_url = os.environ.get('GAME_STATE_REDIS_URL', 'redis://localhost:6379/0')
  game_state_ttl_sec = int(os.environ.get('GAME_STATE_TTL_SEC', '900'))

  metrics_backend = os.environ.get('METRICS_BACKEND', None)
  if metrics_backend is None:
    metrics_backend = ('redis' if game_state_backend.strip().lower() == 'redis' else 'memory')

  metrics_redis_url = os.environ.get('METRICS_REDIS_URL', game_state_redis_url)
  metrics_ttl_sec_raw = os.environ.get('METRICS_TTL_SEC', None)
  if metrics_ttl_sec_raw is None:
    metrics_ttl_sec = (game_state_ttl_sec if metrics_backend.strip().lower() == 'redis' else None)
  else:
    metrics_ttl_sec = int(metrics_ttl_sec_raw)

  gameplay_db_enabled = env_bool('GAMEPLAY_DB_ENABLED', True)
  gameplay_db_path = os.environ.get(
    'GAMEPLAY_DB_PATH',
    os.path.join(data_path, 'data', 'database', 'gameplay.sqlite3'),
  )
  gameplay_db_busy_timeout_ms = int(os.environ.get('GAMEPLAY_DB_BUSY_TIMEOUT_MS', '5000'))

  server = Server(
    data_path=data_path,
    snake_type=os.environ.get('SNAKE', default_snake_type),
    storage_type=os.environ.get('STORAGE', 'LocalStorage'),
    debug=env_bool('DEBUG_SERVER'),
    check_tls_security=False,
    game_state_backend=game_state_backend,
    game_state_redis_url=game_state_redis_url,
    game_state_ttl_sec=game_state_ttl_sec,
    game_state_local_cache=env_bool('GAME_STATE_LOCAL_CACHE', default=True),
    metrics_backend=metrics_backend,
    metrics_redis_url=metrics_redis_url,
    metrics_ttl_sec=metrics_ttl_sec,
    gameplay_db_enabled=gameplay_db_enabled,
    gameplay_db_path=gameplay_db_path,
    gameplay_db_busy_timeout_ms=gameplay_db_busy_timeout_ms,
  )

  if env_bool('STORE_GAME_HISTORY'):
    server.enable_store_game_state()

  return server

def build_run_config() -> RunConfig:
  return {
    'host': os.environ.get('HOST', '0.0.0.0'),
    'port': int(os.environ.get('PORT', '8000')),
    'debug': env_bool('DEBUG'),
  }