from account.decorators import login_required
from file.models import File

from django.http import FileResponse
from django.utils.http import urlquote
from folder.models import Folder
from .judgement_function import judge_filepath
from account.models import get_user
from utils.debug import debug_view
from utils.http import make_json_response
from utils.permission import can_delete
from utils.crypto import secure_transport
from utils.crypto import get_file_encrypt_cipher, get_padding
import base64

# Create your views here.


@secure_transport
@debug_view(template_name='upload_file.html')
@login_required
def upload_file(request):
    data = request.POST
    user = get_user(request)
    key = data.get('key', '')
    if key:
        file_b64 = data.get('file_b64')
        if not file_b64:
            return make_json_response(code=400, error='文件不存在')
        file_name = data.get('file_name')
    else:
        try:
            file_obj = request.FILES.get('file')
        except:
            return make_json_response(code=400, error='文件不存在')
        file_name = file_obj.name
    file_type = judge_filepath(file_name.split('.')[-1].lower()) if '.' in file_name else ''
    father_folder_id = data.get('father_folder_id')
    try:
        folder = Folder.objects.get(folder_id=father_folder_id)
    except:
        return make_json_response(code=402, error='文件夹不存在')
    if not folder.check_permission(user=user):
        return make_json_response(code=404, error='没有上传文件的权限')
    file = File.objects.create(file_name=file_name,
                               father_folder=folder,
                               file_type=file_type,
                               owner=user,
                               group=folder.group,
                               key=key)
    try:
        file_path = file.get_path()
        with open(file_path, 'wb+') as f:
            if key:
                print(key)
                file.file_type, content_b64 = file_b64.split(',')
                file.save()
                file_bytes = base64.b64decode(content_b64)
                file_bytes += get_padding(file_bytes)
                enc_file_bytes = get_file_encrypt_cipher(key).encrypt(file_bytes)
                f.write(enc_file_bytes)
            else:
                for chunk in file_obj.chunks():
                    f.write(chunk)
    except Exception as e:
        print(e)
        file.delete()
        return make_json_response(code=500, error='文件保存失败')

    return make_json_response()


@secure_transport
# @debug_view('file_id')
@login_required
def download_file(request):
    user = get_user(request)
    file_id = request.POST.get('file_id')
    try:
        file = File.objects.get(file_id=file_id)
    except:
        return make_json_response(code=402, error='文件不存在')
    if not file.father_folder.check_permission(user=user):
        return make_json_response(code=404, error='没有下载文件的权限')
    try:
        file_path = file.get_path()
        f = open(file_path, 'rb')
    except:
        return make_json_response(code=500, error='文件读取失败')
    if file.key:
        try:
            enc_file_bytes = f.read()
            file_bytes = get_file_encrypt_cipher(file.key).decrypt(enc_file_bytes)
            content_b64 = base64.b64encode(file_bytes).decode()
            file_b64 = f'{file.file_type},{content_b64}'
            f.close()
        except Exception as e:
            print(e)
            return make_json_response(code=500, error='文件读取失败')
        return make_json_response(file_b64=file_b64, **file.to_json())
    else:
        file_bytes = f.read()
        content_b64 = base64.b64encode(file_bytes).decode()
        file_b64 = f'{file.file_type},{content_b64}'
        f.close()
        return make_json_response(file_b64=file_b64, **file.to_json())
        # file_name = file.file_name
        # response = FileResponse(f)
        # response['Content-Type'] = 'application/octet-stream'
        # response['Content-Disposition'] = 'attachment;filename={}'.format(urlquote(file_name))
        # return response


@secure_transport
# @debug_view('file_id')
@login_required
def delete_file(request):
    data = request.POST
    user = get_user(request)
    file_id = data.get('file_id')
    try:
        file = File.objects.get(file_id=file_id)
    except:
        return make_json_response(code=402, error='文件不存在')
    if not can_delete(user=user, f=file):
        return make_json_response(code=404, error='没有删除文件的权限')
    file.delete()
    return make_json_response()