import os
import json
from pathlib import Path
from dotenv import load_dotenv

# 基础路径配置
BASE_DIR = Path(__file__).parent.parent.parent
REPO_DIR = BASE_DIR.parent
UPLOAD_DIR = BASE_DIR / "uploads"
AUDIO_DIR = UPLOAD_DIR / "audio"
TEMP_UPLOAD_DIR = UPLOAD_DIR / "temp_audio"
MARKDOWN_DIR = UPLOAD_DIR / "markdown"
CLIENT_DIR = UPLOAD_DIR / "clients"
EXTERNAL_APPS_DIR = UPLOAD_DIR / "external_apps"
USER_DIR = UPLOAD_DIR / "user"
LEGACY_VOICEPRINT_DIR = USER_DIR / "voiceprint"
LEGACY_AVATAR_DIR = USER_DIR / "avatar"
VOICEPRINT_DIR = USER_DIR
AVATAR_DIR = USER_DIR


def _is_running_in_docker() -> bool:
    return Path("/.dockerenv").exists()


def _load_env_file(dotenv_path: Path) -> None:
    if dotenv_path.exists():
        load_dotenv(dotenv_path=dotenv_path, override=False)


# 非 Docker 本地运行时，兼容读取仓库根目录 .env 与 backend/.env；
# Docker 容器内只使用显式注入的环境变量，避免意外读取镜像内的开发配置。
if not _is_running_in_docker():
    _load_env_file(REPO_DIR / ".env")
    _load_env_file(BASE_DIR / ".env")


def _get_env(*names: str, default: str | None = None, allow_blank: bool = True) -> str | None:
    for name in names:
        value = os.getenv(name)
        if value is None:
            continue
        value = value.strip() if isinstance(value, str) else value
        if value == "" and not allow_blank:
            continue
        return value
    return default


def _get_int_env(*names: str, default: int) -> int:
    raw_value = _get_env(*names, default=str(default), allow_blank=False)
    try:
        return int(raw_value) if raw_value is not None else default
    except (TypeError, ValueError):
        return default


def _normalize_base_url(value: str | None) -> str:
    normalized = str(value or "").strip().rstrip("/")
    return normalized or "http://localhost"


def get_user_data_dir(user_id: int | str) -> Path:
    return USER_DIR / str(user_id)


def get_user_voiceprint_dir(user_id: int | str) -> Path:
    return get_user_data_dir(user_id) / "voiceprint"


def get_user_avatar_dir(user_id: int | str) -> Path:
    return get_user_data_dir(user_id) / "avatar"

# 文件上传配置
ALLOWED_EXTENSIONS = {".mp3", ".wav", ".m4a", ".mpeg", ".mp4"}
ALLOWED_IMAGE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".gif", ".webp"}
ALLOWED_VOICEPRINT_EXTENSIONS = {".wav"}
ALLOWED_CLIENT_EXTENSIONS = {".apk", ".exe", ".dmg", ".deb", ".rpm", ".pkg", ".msi", ".zip", ".tar.gz"}
MAX_FILE_SIZE = 100 * 1024 * 1024  # 100MB
MAX_IMAGE_SIZE = 10 * 1024 * 1024  # 10MB
MAX_CLIENT_SIZE = 500 * 1024 * 1024  # 500MB for client installers

# 确保上传目录存在
UPLOAD_DIR.mkdir(exist_ok=True)
AUDIO_DIR.mkdir(exist_ok=True)
MARKDOWN_DIR.mkdir(exist_ok=True)
CLIENT_DIR.mkdir(exist_ok=True)
EXTERNAL_APPS_DIR.mkdir(exist_ok=True)
USER_DIR.mkdir(exist_ok=True)
LEGACY_VOICEPRINT_DIR.mkdir(exist_ok=True)
LEGACY_AVATAR_DIR.mkdir(exist_ok=True)


# 数据库配置
DATABASE_CONFIG = {
    'host': _get_env('DB_HOST', 'MYSQL_HOST', default='127.0.0.1', allow_blank=False),
    'user': _get_env('DB_USER', 'MYSQL_USER', default='root', allow_blank=False),
    'password': _get_env('DB_PASSWORD', 'MYSQL_PASSWORD', default=''),
    'database': _get_env('DB_NAME', 'MYSQL_DATABASE', default='imeeting', allow_blank=False),
    'port': _get_int_env('DB_PORT', 'MYSQL_PORT', default=3306),
    'charset': 'utf8mb4'
}

# API配置
API_CONFIG = {
    'host': _get_env('API_HOST', default='0.0.0.0', allow_blank=False),
    'port': _get_int_env('API_PORT', default=8000)
}

# 七牛云配置
# QINIU_ACCESS_KEY = os.getenv('QINIU_ACCESS_KEY', 'A0tp96HCtg-wZCughTgi5vc2pJnw3btClwxRE_e8')
# QINIU_SECRET_KEY = os.getenv('QINIU_SECRET_KEY', 'Lj-MSHpaVbmzpS86kMIjmwikvYOT9iPBjCk9hm6k')
# QINIU_BUCKET = os.getenv('QINIU_BUCKET', 'imeeting_dev')
# QINIU_DOMAIN = os.getenv('QINIU_DOMAIN', 't0vogyxkz.hn-bkt.clouddn.com')

# 应用配置
APP_CONFIG = {
    'base_url': _normalize_base_url(_get_env('BASE_URL', default='http://localhost', allow_blank=False))
}

# Redis配置
REDIS_CONFIG = {
    'host': _get_env('REDIS_HOST', default='127.0.0.1', allow_blank=False),
    'port': _get_int_env('REDIS_PORT', default=6379),
    'db': _get_int_env('REDIS_DB', default=0),
    'password': _get_env('REDIS_PASSWORD', default=''),
    'decode_responses': True
}

# 转录轮询配置 - 用于 upload-audio-complete 接口
TRANSCRIPTION_POLL_CONFIG = {
    'poll_interval': _get_int_env('TRANSCRIPTION_POLL_INTERVAL', default=10),  # 轮询间隔：10秒
    'max_wait_time': _get_int_env('TRANSCRIPTION_MAX_WAIT_TIME', default=1800),  # 最大等待：30分钟
}

# 后台任务配置
BACKGROUND_TASK_CONFIG = {
    'summary_workers': _get_int_env('SUMMARY_TASK_MAX_WORKERS', default=2),
    'monitor_workers': _get_int_env('MONITOR_TASK_MAX_WORKERS', default=8),
    'transcription_status_cache_ttl': _get_int_env('TRANSCRIPTION_STATUS_CACHE_TTL', default=3),
}