"""项目路径与环境变量加载。"""

from __future__ import annotations

import os
import sys
from pathlib import Path

from dotenv import load_dotenv

ROOT = Path(__file__).resolve().parent.parent
BOT_DIR = ROOT / "bot"
OUTPUT_DIR = ROOT / "output"
LOG_DIR = ROOT / "logs"
CACHE_DIR = ROOT / ".cache"
SNAPSHOT_FILE = CACHE_DIR / "last-report.json"

# 企微 webhook markdown.content 硬上限
WECOM_MARKDOWN_LIMIT = 4096


def wecom_chunk_bytes() -> int:
    """单条企微 markdown 消息字节上限。"""
    chunk = env_int("DAILY_WECOM_CHUNK_BYTES", -1)
    if chunk < 0:
        chunk = env_int("DAILY_WECOM_MAX_BYTES", WECOM_MARKDOWN_LIMIT)
    return min(chunk, WECOM_MARKDOWN_LIMIT)


def wecom_skill_desc_limit() -> int:
    """企微 Skills 榜单条简介建议字数。"""
    return env_int("DAILY_WECOM_SKILL_DESC_LIMIT", 56)


def full_desc_limit() -> int:
    """完整版早报摘要长度；0 表示不截断。"""
    return env_int("DAILY_FULL_DESC_LIMIT", 0)


def news_summary_limit() -> int:
    return env_int("DAILY_FULL_NEWS_SUMMARY_LIMIT", 0)


def wecom_max_bytes() -> int:
    """兼容旧配置名。"""
    return wecom_chunk_bytes()

load_dotenv(ROOT / ".env")
load_dotenv(ROOT / ".env.local", override=True)


def ensure_bot_on_path() -> None:
    bot = str(BOT_DIR)
    if bot not in sys.path:
        sys.path.insert(0, bot)


def _clean_env_value(raw: str | None) -> str | None:
    if raw is None:
        return None
    value = raw.strip()
    if not value:
        return None
    # .env 行内注释（未加引号时 python-dotenv 不会自动去掉）
    if " #" in value:
        value = value.split(" #", 1)[0].rstrip()
    return value or None


def env(key: str, default: str | None = None) -> str | None:
    return _clean_env_value(os.getenv(key, default))


def env_int(key: str, default: int) -> int:
    raw = env(key)
    if not raw:
        return default
    try:
        return int(raw)
    except ValueError:
        return default