"""兼容 S3 的对象存储上传模块."""
import logging
import os
import time
import uuid
from pathlib import Path
from typing import Optional

logger = logging.getLogger(__name__)


class OSSUploader:
    """基于 boto3 的 S3 兼容对象存储上传器."""

    def __init__(self, config: Optional[dict] = None):
        from config.oss import S3_COMPATIBLE_CONFIG

        self.config = config or S3_COMPATIBLE_CONFIG
        self.enabled = self.config.get("enabled", False)
        self.client = None
        self.bucket = self.config.get("bucket_name", "")
        self.path_prefix = self.config.get("path_prefix", "device")
        self.custom_domain = self.config.get("custom_domain", "")
        self.endpoint_url = self.config.get("endpoint_url", "")
        self.retry_times = self.config.get("retry_times", 3)
        self.upload_timeout = self.config.get("upload_timeout", 30)

        if self.enabled:
            try:
                import boto3
                from botocore.config import Config

                s3_config = Config(
                    s3={"addressing_style": "path"},
                    signature_version="s3v4",
                    retries={"max_attempts": self.retry_times, "mode": "standard"},
                )
                self.client = boto3.client(
                    "s3",
                    endpoint_url=self.endpoint_url,
                    region_name=self.config.get("region_name", "us-east-1"),
                    aws_access_key_id=self.config.get("access_key_id", ""),
                    aws_secret_access_key=self.config.get("secret_access_key", ""),
                    config=s3_config,
                    verify=False,
                )
                logger.info("[OSS] 上传器初始化完成: %s/%s", self.endpoint_url, self.bucket)
            except Exception as exc:
                logger.error("[OSS] 初始化失败: %s", exc)
                self.enabled = False

    def _object_key(self, local_path: str, suffix: str = "") -> str:
        """生成对象存储 key."""
        filename = Path(local_path).name
        if suffix:
            stem = Path(filename).stem
            ext = Path(filename).suffix
            filename = f"{stem}_{suffix}{ext}"
        date_dir = time.strftime("%Y%m%d")
        unique = uuid.uuid4().hex[:8]
        return f"{self.path_prefix}/{date_dir}/{unique}_{filename}"

    def _make_url(self, key: str) -> str:
        """根据 endpoint 或自定义域名生成访问 URL."""
        if self.custom_domain:
            base = self.custom_domain.rstrip("/")
            return f"{base}/{key}"
        base = self.endpoint_url.rstrip("/")
        return f"{base}/{self.bucket}/{key}"

    def upload(self, local_path: str, suffix: str = "") -> Optional[str]:
        """上传单个文件到 OSS，返回可访问 URL."""
        if not self.enabled or self.client is None:
            return None

        if not os.path.isfile(local_path):
            logger.warning("[OSS] 文件不存在: %s", local_path)
            return None

        key = self._object_key(local_path, suffix)
        for attempt in range(1, self.retry_times + 1):
            try:
                self.client.upload_file(
                    local_path,
                    self.bucket,
                    key,
                    ExtraArgs={"ContentType": "image/jpeg"},
                )
                url = self._make_url(key)
                logger.info("[OSS] 上传成功: %s -> %s", local_path, url)
                return url
            except Exception as exc:
                logger.warning("[OSS] 上传失败 (尝试 %d/%d): %s - %s", attempt, self.retry_times, local_path, exc)
                if attempt < self.retry_times:
                    time.sleep(0.5 * attempt)

        logger.error("[OSS] 上传最终失败: %s", local_path)
        return None

    def upload_pair(self, original_path: str, marked_path: str, prefix: str = "") -> dict:
        """上传原图和标注图，返回 URL 字典."""
        orig_suffix = f"original_{prefix}" if prefix else "original"
        mark_suffix = f"marked_{prefix}" if prefix else "marked"
        return {
            "original": self.upload(original_path, suffix=orig_suffix),
            "marked": self.upload(marked_path, suffix=mark_suffix),
        }