"""文件上传接口"""
import os
from typing import Optional
from fastapi import APIRouter, Depends, UploadFile, File, HTTPException, Form
from sqlalchemy.orm import Session

from app.core.database import get_db
from app.core.auth import get_current_user
from app.core.response import success_response, error_response
from app.core.storage import storage

router = APIRouter(prefix="/api/upload", tags=["文件上传"])


# 允许的文件类型
ALLOWED_IMAGE_TYPES = {"image/jpeg", "image/png", "image/gif", "image/webp", "image/heic", "image/heif"}
ALLOWED_DOCUMENT_TYPES = {
    "application/pdf",
    "application/msword",
    "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
}

# 文件大小限制 (字节)
MAX_IMAGE_SIZE = 10 * 1024 * 1024  # 10MB
MAX_DOCUMENT_SIZE = 20 * 1024 * 1024  # 20MB


async def validate_file(file: UploadFile, max_size: int, allowed_types: set) -> bytes:
    """验证文件"""
    if file.content_type not in allowed_types:
        raise HTTPException(
            status_code=400,
            detail=f"不支持的文件类型: {file.content_type}"
        )
    
    content = b""
    chunk_size = 1024 * 1024
    while True:
        chunk = await file.read(chunk_size)
        if not chunk:
            break
        content += chunk
        if len(content) > max_size:
            raise HTTPException(status_code=400, detail="文件大小超过限制")
    
    await file.seek(0)
    return content


@router.post("/image", response_model=dict)
async def upload_image(
    file: UploadFile = File(...),
    folder: str = Form("images"),
    current_user: dict = Depends(get_current_user)
):
    """上传图片"""
    try:
        content = await validate_file(file, MAX_IMAGE_SIZE, ALLOWED_IMAGE_TYPES)
        original_filename = file.filename or "image.jpg"
        url = storage.upload_file(content, original_filename, folder)
        return success_response({
            "url": url,
            "filename": original_filename,
            "contentType": file.content_type,
            "size": len(content)
        })
    except HTTPException:
        raise
    except Exception as e:
        return error_response(500, f"上传失败: {str(e)}")


@router.post("/images", response_model=dict)
async def upload_images(
    files: list[UploadFile] = File(...),
    folder: str = Form("images"),
    current_user: dict = Depends(get_current_user)
):
    """批量上传图片"""
    if len(files) > 9:
        return error_response(400, "最多支持同时上传9张图片")
    
    results = []
    errors = []
    
    for i, file in enumerate(files):
        try:
            content = await validate_file(file, MAX_IMAGE_SIZE, ALLOWED_IMAGE_TYPES)
            original_filename = file.filename or f"image_{i}.jpg"
            url = storage.upload_file(content, original_filename, folder)
            results.append({
                "url": url,
                "filename": original_filename,
                "contentType": file.content_type,
                "size": len(content),
                "index": i
            })
        except Exception as e:
            errors.append({"index": i, "filename": file.filename, "error": str(e)})
    
    return success_response({
        "success": results,
        "errors": errors,
        "totalSuccess": len(results),
        "totalError": len(errors)
    })


@router.post("/document", response_model=dict)
async def upload_document(
    file: UploadFile = File(...),
    folder: str = Form("documents"),
    current_user: dict = Depends(get_current_user)
):
    """上传文档"""
    try:
        content = await validate_file(file, MAX_DOCUMENT_SIZE, ALLOWED_DOCUMENT_TYPES)
        original_filename = file.filename or "document.pdf"
        url = storage.upload_file(content, original_filename, folder)
        return success_response({
            "url": url,
            "filename": original_filename,
            "contentType": file.content_type,
            "size": len(content)
        })
    except HTTPException:
        raise
    except Exception as e:
        return error_response(500, f"上传失败: {str(e)}")


@router.post("/base64", response_model=dict)
async def upload_base64(
    data: dict,
    current_user: dict = Depends(get_current_user)
):
    """上传 Base64 编码的图片"""
    try:
        base64_data = data.get("base64")
        filename = data.get("filename", "image.png")
        folder = data.get("folder", "images")
        
        if not base64_data:
            return error_response(400, "base64数据不能为空")
        
        url = storage.upload_base64(base64_data, filename, folder)
        return success_response({"url": url, "filename": filename})
    except Exception as e:
        return error_response(500, f"上传失败: {str(e)}")


@router.delete("/file", response_model=dict)
async def delete_file(
    url: str,
    current_user: dict = Depends(get_current_user)
):
    """删除文件"""
    try:
        success = storage.delete_file(url)
        if success:
            return success_response({"message": "删除成功"})
        return error_response(400, "文件不存在或删除失败")
    except Exception as e:
        return error_response(500, f"删除失败: {str(e)}")


@router.get("/info", response_model=dict)
async def get_storage_info(
    current_user: dict = Depends(get_current_user)
):
    """获取存储配置信息"""
    from app.core.config import settings
    
    info = {
        "storageType": settings.STORAGE_TYPE,
        "maxImageSize": MAX_IMAGE_SIZE,
        "maxDocumentSize": MAX_DOCUMENT_SIZE,
        "allowedImageTypes": list(ALLOWED_IMAGE_TYPES),
        "allowedDocumentTypes": list(ALLOWED_DOCUMENT_TYPES)
    }
    
    if settings.STORAGE_TYPE == "local":
        info["baseUrl"] = settings.LOCAL_STORAGE_URL
    elif settings.STORAGE_TYPE == "qiniu":
        info["domain"] = settings.QINIU_DOMAIN
    elif settings.STORAGE_TYPE == "oss":
        info["domain"] = settings.OSS_DOMAIN
    elif settings.STORAGE_TYPE == "minio":
        info["domain"] = settings.MINIO_BASE_URL or f"http://{settings.MINIO_ENDPOINT}/{settings.MINIO_BUCKET}"
    
    return success_response(info)