# Copyright: (c) OpenSpug Organization. https://github.com/openspug/spug
# Copyright: (c) <spug.dev@gmail.com>
# Released under the AGPL-3.0 License.
from django.views.generic import View
from django_redis import get_redis_connection
from apps.host.models import Host
from apps.account.utils import has_host_perm
from apps.file.utils import FileResponseAfter, FileResponse, parse_sftp_attr
from libs import json_response, JsonParser, Argument
from functools import partial
import os


class FileView(View):
    def get(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='参数错误'),
            Argument('path', help='参数错误')
        ).parse(request.GET)
        if error is None:
            if not has_host_perm(request.user, form.id):
                return json_response(error='无权访问主机，请联系管理员')
            host = Host.objects.get(pk=form.id)
            if not host:
                return json_response(error='未找到指定主机')
            with host.get_ssh() as ssh:
                objects = ssh.list_dir_attr(form.path)
            return json_response([parse_sftp_attr(x) for x in objects])
        return json_response(error=error)


class ObjectView(View):
    def get(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='参数错误'),
            Argument('file', help='请输入文件路径')
        ).parse(request.GET)
        if error is None:
            if not has_host_perm(request.user, form.id):
                return json_response(error='无权访问主机，请联系管理员')
            host = Host.objects.filter(pk=form.id).first()
            if not host:
                return json_response(error='未找到指定主机')
            filename = os.path.basename(form.file)
            ssh_cli = host.get_ssh().get_client()
            sftp = ssh_cli.open_sftp()
            f = sftp.open(form.file)
            return FileResponseAfter(ssh_cli.close, f, as_attachment=True, filename=filename)
        return json_response(error=error)

    def post(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='参数错误'),
            Argument('token', help='参数错误'),
            Argument('path', help='参数错误'),
        ).parse(request.POST)
        if error is None:
            if not has_host_perm(request.user, form.id):
                return json_response(error='无权访问主机，请联系管理员')
            file = request.FILES.get('file')
            if not file:
                return json_response(error='请选择要上传的文件')
            host = Host.objects.get(pk=form.id)
            if not host:
                return json_response(error='未找到指定主机')
            rds_cli = get_redis_connection()
            callback = partial(self._compute_progress, rds_cli, form.token, file.size)
            with host.get_ssh() as ssh:
                ssh.put_file_by_fl(file, f'{form.path}/{file.name}', callback=callback)
        return json_response(error=error)

    def delete(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='参数错误'),
            Argument('file', help='请输入文件路径')
        ).parse(request.GET)
        if error is None:
            if not has_host_perm(request.user, form.id):
                return json_response(error='无权访问主机，请联系管理员')
            host = Host.objects.get(pk=form.id)
            if not host:
                return json_response(error='未找到指定主机')
            with host.get_ssh() as ssh:
                ssh.remove_file(form.file)
        return json_response(error=error)

    def _compute_progress(self, rds_cli, token, total, value, *args):
        percent = '%.1f' % (value / total * 100)
        rds_cli.lpush(token, percent)
        rds_cli.expire(token, 300)