import re
from typing import Optional

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    # snpdb (궤적 데이터 소스)
    SNPDB_HOST: str = '211.208.115.83'
    SNPDB_PORT: int = 5432
    SNPDB_NAME: str = 'snpdb'
    SNPDB_USER: str = 'snp'
    SNPDB_PASSWORD: str = 'snp#8932'

    # kcgdb (분석 결과 저장 — kcgaidb 통합 DB)
    KCGDB_HOST: str = '211.208.115.83'
    KCGDB_PORT: int = 5432
    KCGDB_NAME: str = 'kcgaidb'
    KCGDB_SCHEMA: str = 'kcg'
    KCGDB_USER: str = 'kcg-app'
    KCGDB_PASSWORD: str = 'Kcg2026ai'

    # 스케줄러
    SCHEDULER_INTERVAL_MIN: int = 5

    # 인메모리 캐시
    CACHE_WINDOW_HOURS: int = 24
    INITIAL_LOAD_HOURS: int = 24
    STATIC_INFO_REFRESH_MIN: int = 60
    PERMIT_REFRESH_MIN: int = 30
    SNPDB_SAFE_DELAY_MIN: int = 12
    SNPDB_BACKFILL_BUCKETS: int = 3

    # 파이프라인
    TRAJECTORY_HOURS: int = 6
    MMSI_PREFIX: str = '412'
    MIN_TRAJ_POINTS: int = 100

    # signal-batch API (gc-signal-batch — 정적정보 보강용)
    SIGNAL_BATCH_URL: str = 'http://192.168.1.18:18090/signal-batch'
    SIGNAL_BATCH_TIMEOUT: int = 60

    # Ollama (LLM)
    OLLAMA_BASE_URL: str = 'http://localhost:11434'
    OLLAMA_MODEL: str = 'qwen3:14b'  # CPU-only: 14b 권장, GPU 있으면 32b
    OLLAMA_TIMEOUT_SEC: int = 300

    # Redis
    REDIS_HOST: str = 'localhost'
    REDIS_PORT: int = 6379
    REDIS_PASSWORD: str = ''

    # 로깅
    LOG_LEVEL: str = 'INFO'

    model_config = {'env_file': '.env', 'env_file_encoding': 'utf-8', 'extra': 'ignore'}


settings = Settings()

_SQL_IDENTIFIER = re.compile(r'^[A-Za-z_][A-Za-z0-9_]*$')


def qualified_table(table_name: str, schema: Optional[str] = None) -> str:
    resolved_schema = schema or settings.KCGDB_SCHEMA
    if not _SQL_IDENTIFIER.fullmatch(resolved_schema):
        raise ValueError(f'Invalid schema name: {resolved_schema!r}')
    if not _SQL_IDENTIFIER.fullmatch(table_name):
        raise ValueError(f'Invalid table name: {table_name!r}')
    return f'{resolved_schema}.{table_name}'