"""
utils/logger.py
统一日志模块：从 settings 读取日志级别与文件路径配置
"""

import logging
import sys
from pathlib import Path


# ── ANSI 颜色常量 ──────────────────────────────────────────────
class Color:
    RESET   = "\033[0m"
    BOLD    = "\033[1m"
    CYAN    = "\033[96m"
    GREEN   = "\033[92m"
    YELLOW  = "\033[93m"
    RED     = "\033[91m"
    MAGENTA = "\033[95m"
    BLUE    = "\033[94m"
    GREY    = "\033[90m"


class ColorFormatter(logging.Formatter):
    LEVEL_COLORS = {
        logging.DEBUG:    Color.GREY,
        logging.INFO:     Color.CYAN,
        logging.WARNING:  Color.YELLOW,
        logging.ERROR:    Color.RED,
        logging.CRITICAL: Color.MAGENTA,
    }
    COMPONENT_COLORS = {
        "CLIENT": Color.BLUE,
        "LLM":    Color.GREEN,
        "MCP":    Color.YELLOW,
        "TOOL":   Color.MAGENTA,
        "MEMORY": Color.CYAN,
        "SYSTEM": Color.GREY,
        "CONFIG": Color.GREEN,
    }

    def format(self, record: logging.LogRecord) -> str:
        from datetime import datetime
        level_color = self.LEVEL_COLORS.get(record.levelno, Color.RESET)
        time_str    = datetime.now().strftime("%H:%M:%S.%f")[:-3]
        component   = record.name.split(".")[-1].upper()
        comp_color  = self.COMPONENT_COLORS.get(component, Color.RESET)
        return (
            f"{Color.GREY}[{time_str}]{Color.RESET} "
            f"{comp_color}{Color.BOLD}[{component:6s}]{Color.RESET} "
            f"{level_color}{record.getMessage()}{Color.RESET}"
        )


def get_logger(component: str, level: int | None = None) -> logging.Logger:
    """
    获取指定组件的 Logger 实例，日志级别与文件路径从 settings 读取

    Args:
        component: 组件名称，如 "CLIENT"、"LLM"、"MCP"
        level:     覆盖日志级别（None 时从 settings 读取）
    """
    # 延迟导入避免循环依赖（settings 初始化时也会用到 logger）
    from config.settings import settings as cfg

    if level is None:
        level = getattr(logging, cfg.logging.level, logging.DEBUG)

    logger = logging.getLogger(f"agent.{component}")
    logger.setLevel(level)

    if logger.handlers:
        return logger

    # 终端 Handler
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setFormatter(ColorFormatter())
    logger.addHandler(console_handler)

    # 文件 Handler（由配置控制开关）
    if cfg.logging.enable_file:
        log_dir = Path(cfg.logging.log_dir)
        log_dir.mkdir(parents=True, exist_ok=True)
        file_handler = logging.FileHandler(
            log_dir / cfg.logging.log_file, encoding="utf-8"
        )
        file_handler.setFormatter(
            logging.Formatter("[%(asctime)s] [%(name)s] %(levelname)s: %(message)s")
        )
        logger.addHandler(file_handler)

    logger.propagate = False
    return logger