"""配置模型与环境变量加载。"""
from __future__ import annotations

import os
from dataclasses import dataclass, field


@dataclass
class Config:
    """模块运行配置。所有字段均可通过环境变量覆盖。"""

    # Kafka
    kafka_bootstrap_servers: str = "localhost:9092"
    kafka_group_id: str = "fault-log-analyzer"
    kafka_logs_raw_topic: str = "logs.raw"
    kafka_logs_fault_topic: str = "logs.fault"

    # Elasticsearch
    es_hosts: list[str] = field(default_factory=lambda: ["http://localhost:9200"])
    es_index_pattern: str = "hms-fault-log-{yyyy.MM}"

    # MySQL
    mysql_host: str = "localhost"
    mysql_port: int = 3306
    mysql_user: str = "hms"
    mysql_password: str = ""
    mysql_db: str = "hms"

    # Redis
    redis_url: str = "redis://localhost:6379/0"

    # API
    api_host: str = "0.0.0.0"
    api_port: int = 8080

    # 聚类
    cluster_eps: float = 0.75
    cluster_min_samples: int = 5
    cluster_use_sklearn: bool = False

    # 根因分析
    root_cause_window_minutes: int = 5

    # 去重窗口（秒）
    dedup_ttl_seconds: int = 300

    # 存储模式：memory（默认，便于离线运行/测试）或真实后端
    storage: str = "memory"

    @classmethod
    def from_env(cls) -> "Config":
        """从环境变量构建配置。"""
        cfg = cls()
        env = os.environ

        def _get(name: str, default: str) -> str:
            return env.get(name, default)

        cfg.kafka_bootstrap_servers = _get("KAFKA_BOOTSTRAP_SERVERS", cfg.kafka_bootstrap_servers)
        cfg.kafka_group_id = _get("KAFKA_GROUP_ID", cfg.kafka_group_id)
        cfg.kafka_logs_raw_topic = _get("KAFKA_LOGS_RAW_TOPIC", cfg.kafka_logs_raw_topic)
        cfg.kafka_logs_fault_topic = _get("KAFKA_LOGS_FAULT_TOPIC", cfg.kafka_logs_fault_topic)

        es_hosts = _get("ES_HOSTS", ",".join(cfg.es_hosts))
        cfg.es_hosts = [h.strip() for h in es_hosts.split(",") if h.strip()]
        cfg.es_index_pattern = _get("ES_INDEX_PATTERN", cfg.es_index_pattern)

        cfg.mysql_host = _get("MYSQL_HOST", cfg.mysql_host)
        cfg.mysql_port = int(_get("MYSQL_PORT", str(cfg.mysql_port)))
        cfg.mysql_user = _get("MYSQL_USER", cfg.mysql_user)
        cfg.mysql_password = _get("MYSQL_PASSWORD", cfg.mysql_password)
        cfg.mysql_db = _get("MYSQL_DB", cfg.mysql_db)

        cfg.redis_url = _get("REDIS_URL", cfg.redis_url)

        cfg.api_host = _get("API_HOST", cfg.api_host)
        cfg.api_port = int(_get("API_PORT", str(cfg.api_port)))

        cfg.cluster_eps = float(_get("CLUSTER_EPS", str(cfg.cluster_eps)))
        cfg.cluster_min_samples = int(_get("CLUSTER_MIN_SAMPLES", str(cfg.cluster_min_samples)))
        cfg.cluster_use_sklearn = _get("CLUSTER_USE_SKLEARN", "false").lower() in (
            "1",
            "true",
            "yes",
        )

        cfg.root_cause_window_minutes = int(
            _get("ROOT_CAUSE_WINDOW_MINUTES", str(cfg.root_cause_window_minutes))
        )
        cfg.dedup_ttl_seconds = int(_get("DEDUP_TTL_SECONDS", str(cfg.dedup_ttl_seconds)))
        cfg.storage = _get("STORAGE", cfg.storage)

        return cfg