/*
 *     Copyright 2020 The Dragonfly Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package server

import (
	"context"
	"time"

	"d7y.io/dragonfly/v2/pkg/unit"
	"github.com/golang/protobuf/ptypes/empty"

	logger "d7y.io/dragonfly/v2/internal/dflog"
	"d7y.io/dragonfly/v2/pkg/rpc"
	"d7y.io/dragonfly/v2/pkg/rpc/base"
	"d7y.io/dragonfly/v2/pkg/rpc/scheduler"
	"d7y.io/dragonfly/v2/pkg/util/net/iputils"
	"go.uber.org/zap"
	"google.golang.org/grpc"
)

func init() {
	// set register with server implementation.
	rpc.SetRegister(func(s *grpc.Server, impl interface{}) {
		scheduler.RegisterSchedulerServer(s, &proxy{server: impl.(SchedulerServer)})
	})
}

type proxy struct {
	server SchedulerServer
	scheduler.UnimplementedSchedulerServer
}

// SchedulerServer scheduler.SchedulerServer
type SchedulerServer interface {
	// RegisterPeerTask register a peer to scheduler
	RegisterPeerTask(context.Context, *scheduler.PeerTaskRequest) (*scheduler.RegisterResult, error)
	// ReportPieceResult report piece result to scheduler
	ReportPieceResult(scheduler.Scheduler_ReportPieceResultServer) error
	// ReportPeerResult report peer download result to scheduler
	ReportPeerResult(context.Context, *scheduler.PeerResult) error
	// LeaveTask leave peer from scheduler
	LeaveTask(context.Context, *scheduler.PeerTarget) error
}

func (p *proxy) RegisterPeerTask(ctx context.Context, ptr *scheduler.PeerTaskRequest) (rr *scheduler.RegisterResult, err error) {
	rr, err = p.server.RegisterPeerTask(ctx, ptr)

	var taskID = "unknown"
	var suc bool
	var code base.Code

	if err == nil && rr != nil {
		taskID = rr.TaskId
		suc = true
	}

	peerHost := ptr.PeerHost

	logger.StatPeerLogger.Info("register peer task",
		zap.Bool("success", suc),
		zap.String("taskID", taskID),
		zap.String("url", ptr.Url),
		zap.String("peerIp", peerHost.Ip),
		zap.String("securityDomain", peerHost.SecurityDomain),
		zap.String("idc", peerHost.Idc),
		zap.String("schedulerIp", iputils.HostIP),
		zap.String("schedulerName", iputils.HostName),
		zap.Int32("code", int32(code)))

	return
}

func (p *proxy) ReportPieceResult(stream scheduler.Scheduler_ReportPieceResultServer) error {
	return p.server.ReportPieceResult(stream)
}

func (p *proxy) ReportPeerResult(ctx context.Context, pr *scheduler.PeerResult) (*empty.Empty, error) {
	err := p.server.ReportPeerResult(ctx, pr)

	logger.StatPeerLogger.Info("finish peer task",
		zap.Bool("success", pr.Success),
		zap.String("peerID", pr.PeerId),
		zap.String("taskID", pr.TaskId),
		zap.String("URL", pr.Url),
		zap.String("IDC", pr.Idc),
		zap.String("peerIP", pr.SrcIp),
		zap.String("securityDomain", pr.SecurityDomain),
		zap.String("schedulerIp", iputils.HostIP),
		zap.String("schedulerName", iputils.HostName),
		zap.String("contentLength", unit.Bytes(pr.ContentLength).String()),
		zap.String("traffic", unit.Bytes(uint64(pr.Traffic)).String()),
		zap.Duration("cost", time.Duration(int64(pr.Cost))),
		zap.Int32("code", int32(pr.Code)))
	return new(empty.Empty), err
}

func (p *proxy) LeaveTask(ctx context.Context, pt *scheduler.PeerTarget) (*empty.Empty, error) {
	return new(empty.Empty), p.server.LeaveTask(ctx, pt)
}