from fastapi import APIRouter, Form, UploadFile, File, Depends, HTTPException
from apps.admin.dependencies import admin_required
from apps.base.models import FileCodes
from apps.base.schemas import SelectFileModel
from apps.base.utils import get_expire_info, get_file_path_name, ip_limit
from core.response import APIResponse
from core.settings import settings
from core.storage import storages, FileStorageInterface
from core.utils import get_select_token

share_api = APIRouter(prefix="/share", tags=["分享"])


async def validate_file_size(file: UploadFile, max_size: int):
    if file.size > max_size:
        max_size_mb = max_size / (1024 * 1024)
        raise HTTPException(
            status_code=403, detail=f"大小超过限制,最大为{max_size_mb:.2f} MB"
        )


async def create_file_code(code, **kwargs):
    return await FileCodes.create(code=code, **kwargs)


@share_api.post("/text/", dependencies=[Depends(admin_required)])
async def share_text(
    text: str = Form(...),
    expire_value: int = Form(default=1, gt=0),
    expire_style: str = Form(default="day"),
    ip: str = Depends(ip_limit["upload"]),
):
    text_size = len(text.encode("utf-8"))
    max_txt_size = 222 * 1024
    if text_size > max_txt_size:
        raise HTTPException(status_code=403, detail="内容过多,建议采用文件形式")

    expired_at, expired_count, used_count, code = await get_expire_info(
        expire_value, expire_style
    )
    await create_file_code(
        code=code,
        text=text,
        expired_at=expired_at,
        expired_count=expired_count,
        used_count=used_count,
        size=len(text),
        prefix="Text",
    )
    ip_limit["upload"].add_ip(ip)
    return APIResponse(detail={"code": code})


@share_api.post("/file/", dependencies=[Depends(admin_required)])
async def share_file(
    expire_value: int = Form(default=1, gt=0),
    expire_style: str = Form(default="day"),
    file: UploadFile = File(...),
    ip: str = Depends(ip_limit["upload"]),
):
    await validate_file_size(file, settings.uploadSize)

    if expire_style not in settings.expireStyle:
        raise HTTPException(status_code=400, detail="过期时间类型错误")

    expired_at, expired_count, used_count, code = await get_expire_info(
        expire_value, expire_style
    )
    path, suffix, prefix, uuid_file_name, save_path = await get_file_path_name(file)

    file_storage: FileStorageInterface = storages[settings.file_storage]()
    await file_storage.save_file(file, save_path)

    await create_file_code(
        code=code,
        prefix=prefix,
        suffix=suffix,
        uuid_file_name=uuid_file_name,
        file_path=path,
        size=file.size,
        expired_at=expired_at,
        expired_count=expired_count,
        used_count=used_count,
    )
    ip_limit["upload"].add_ip(ip)
    return APIResponse(detail={"code": code, "name": file.filename})


async def get_code_file_by_code(code, check=True):
    file_code = await FileCodes.filter(code=code).first()
    if not file_code:
        return False, "文件不存在"
    if await file_code.is_expired() and check:
        return False, "文件已过期"
    return True, file_code


async def update_file_usage(file_code):
    file_code.used_count += 1
    if file_code.expired_count > 0:
        file_code.expired_count -= 1
    await file_code.save()


@share_api.get("/select/")
async def get_code_file(code: str, ip: str = Depends(ip_limit["error"])):
    file_storage: FileStorageInterface = storages[settings.file_storage]()
    has, file_code = await get_code_file_by_code(code)
    if not has:
        ip_limit["error"].add_ip(ip)
        return APIResponse(code=404, detail=file_code)

    await update_file_usage(file_code)
    return await file_storage.get_file_response(file_code)


@share_api.post("/select/")
async def select_file(data: SelectFileModel, ip: str = Depends(ip_limit["error"])):
    file_storage: FileStorageInterface = storages[settings.file_storage]()
    has, file_code = await get_code_file_by_code(data.code)
    if not has:
        ip_limit["error"].add_ip(ip)
        return APIResponse(code=404, detail=file_code)

    await update_file_usage(file_code)
    return APIResponse(
        detail={
            "code": file_code.code,
            "name": file_code.prefix + file_code.suffix,
            "size": file_code.size,
            "text": (
                file_code.text
                if file_code.text is not None
                else await file_storage.get_file_url(file_code)
            ),
        }
    )


@share_api.get("/download")
async def download_file(key: str, code: str, ip: str = Depends(ip_limit["error"])):
    file_storage: FileStorageInterface = storages[settings.file_storage]()
    if await get_select_token(code) != key:
        ip_limit["error"].add_ip(ip)

    has, file_code = await get_code_file_by_code(code, False)
    if not has:
        return APIResponse(code=404, detail="文件不存在")

    return (
        APIResponse(detail=file_code.text)
        if file_code.text
        else await file_storage.get_file_response(file_code)
    )
