package waf

import (
	"context"
	"errors"
	"fmt"
	v1 "github.com/go-nunu/nunu-layout-advanced/api/v1"
	"github.com/go-nunu/nunu-layout-advanced/internal/model"
	"github.com/go-nunu/nunu-layout-advanced/internal/repository"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"time"
)

type UdpForWardingRepository interface {
	GetUdpForWarding(ctx context.Context, id int64) (*model.UdpForWarding, error)
	AddUdpForwarding(ctx context.Context, req *model.UdpForWarding) (int, error)
	EditUdpForwarding(ctx context.Context, req *model.UdpForWarding) error
	DeleteUdpForwarding(ctx context.Context, id int64) error
	GetUdpForwardingWafUdpIdById(ctx context.Context, id int) (int, error)
	GetUdpForwardingPortCountByHostId(ctx context.Context, hostId int) (int64, error)
	GetUdpForwardingWafUdpAllIds(ctx context.Context, hostId int) ([]int, error)
	AddUdpForwardingIps(ctx context.Context, req model.UdpForwardingRule) (primitive.ObjectID, error)
	EditUdpForwardingIps(ctx context.Context, req model.UdpForwardingRule) error
	GetUdpForwardingIpsByID(ctx context.Context, udpId int) (*model.UdpForwardingRule, error)
	DeleteUdpForwardingIpsById(ctx context.Context, udpId int) error
	// 获取ip数量等于1的ip
	GetIpCountByIp(ctx context.Context, ips []string) ([]v1.IpCountResult, error)
	// 获取端口数量
	GetPortCount(ctx context.Context, hostId int64, port string) (int64, error)
	GetUdpAll(ctx context.Context, hostIds []int) ([]int, error)
}

func NewUdpForWardingRepository(
	repository *repository.Repository,
) UdpForWardingRepository {
	return &udpForWardingRepository{
		Repository: repository,
	}
}

type udpForWardingRepository struct {
	*repository.Repository
}

func (r *udpForWardingRepository) GetUdpForWarding(ctx context.Context, id int64) (*model.UdpForWarding, error) {
	var udpForWarding model.UdpForWarding
	if err := r.Db.Where("id = ?", id).First(&udpForWarding).Error; err != nil {
		return nil, err
	}

	return &udpForWarding, nil
}

func (r *udpForWardingRepository) AddUdpForwarding(ctx context.Context, req *model.UdpForWarding) (int, error) {
	if err := r.Db.WithContext(ctx).Create(req).Error; err != nil {
		return 0, err
	}
	return req.Id, nil
}

func (r *udpForWardingRepository) EditUdpForwarding(ctx context.Context, req *model.UdpForWarding) error {
	data := map[string]interface{}{
		"proxy" : req.Proxy,
	}
	if err := r.Db.Updates(req).Updates(data).Error; err != nil {
		return err
	}
	return nil
}

func (r *udpForWardingRepository) DeleteUdpForwarding(ctx context.Context, id int64) error {
	if err := r.Db.Where("id = ?", id).Delete(&model.UdpForWarding{}).Error; err != nil {
		return err
	}
	return nil
}

func (r *udpForWardingRepository) GetUdpForwardingWafUdpIdById(ctx context.Context, id int) (int, error) {
	var WafUdpId int

	if err := r.Db.Model(&model.UdpForWarding{}).Where("id = ?", id).Select("waf_udp_id").Find(&WafUdpId).Error; err != nil {
		return 0, err
	}
	return WafUdpId, nil
}

func (r *udpForWardingRepository) GetUdpForwardingPortCountByHostId(ctx context.Context, hostId int) (int64, error)  {
	var count int64
	if err := r.Db.Model(&model.UdpForWarding{}).Where("host_id = ?", hostId).Count(&count).Error; err != nil {
		return 0, err
	}
	return count, nil
}

func (r *udpForWardingRepository) GetUdpForwardingWafUdpAllIds(ctx context.Context, hostId int) ([]int, error) {
	var res []int
	if err:= r.Db.WithContext(ctx).Model(&model.UdpForWarding{}).Where("host_id = ?", hostId).Select("id").Find(&res).Error; err != nil {
		return nil, err
	}
	return res, nil
}


// mongodb 插入
func (r *udpForWardingRepository) AddUdpForwardingIps(ctx context.Context, req model.UdpForwardingRule) (primitive.ObjectID, error) {
	collection := r.MongoDB.Collection("udp_forwarding_rules")
	req.CreatedAt = time.Now()
	result, err := collection.InsertOne(ctx, req)
	if err != nil {
		return primitive.NilObjectID, fmt.Errorf("插入MongoDB失败: %w", err)
	}

	// 返回插入文档的ID
	return result.InsertedID.(primitive.ObjectID), nil
}

func (r *udpForWardingRepository) EditUdpForwardingIps(ctx context.Context, req model.UdpForwardingRule) error {
	collection := r.MongoDB.Collection("udp_forwarding_rules")
	updateData := bson.M{}

	if req.Uid != 0 {
		updateData["uid"] = req.Uid
	}

	if req.HostId != 0 {
		updateData["host_id"] = req.HostId
	}

	if req.UdpId != 0 {
		updateData["udp_id"] = req.UdpId
	}


	if len(req.BackendList) > 0 {
		updateData["backend_list"] = req.BackendList
	}


	updateData["cdn_origin_ids"] = req.CdnOriginIds

	// 始终更新更新时间
	updateData["updated_at"] = time.Now()

	// 如果没有任何字段需要更新，则直接返回
	if len(updateData) == 0 {
		return nil
	}

	// 执行更新
	update := bson.M{"$set": updateData}
	 err := collection.UpdateOne(ctx, bson.M{"udp_id": req.UdpId}, update)
	if err != nil {
		return fmt.Errorf("更新MongoDB文档失败: %w", err)
	}

	return nil
}

func (r *udpForWardingRepository) GetUdpForwardingIpsByID(ctx context.Context, udpId int) (*model.UdpForwardingRule, error) {

	collection := r.MongoDB.Collection("udp_forwarding_rules")
	var result model.UdpForwardingRule
	err := collection.Find(ctx, bson.M{"udp_id": udpId}).One(&result)
	if err != nil {
		if errors.Is(err, mongo.ErrNoDocuments) {
			return nil, nil
		}
		return nil, fmt.Errorf("从MongoDB中获取文档失败: %w", err)
	}
	return &result, nil

}

func (r *udpForWardingRepository) DeleteUdpForwardingIpsById(ctx context.Context, udpId int) error {

	collection := r.MongoDB.Collection("udp_forwarding_rules")

	 err := collection.Remove(ctx, bson.M{"udp_id": udpId})

	if err != nil {
		if errors.Is(err, mongo.ErrNoDocuments) {
			return fmt.Errorf("记录不存在")
		}
		return fmt.Errorf("删除MongoDB文档失败: %w", err)
	}
	return nil

}

// 获取IP数量等于1的IP
func (r *udpForWardingRepository) GetIpCountByIp(ctx context.Context, ips []string) ([]v1.IpCountResult, error) {
	if len(ips) == 0 {
		return []v1.IpCountResult{}, nil
	}

	// 管道逻辑与 TCP 版本完全相同
	pipeline := []bson.M{
		{
			"$unwind": "$backend_list",
		},
		{
			"$addFields": bson.M{
				"extracted_ip": bson.M{
					"$arrayElemAt": []interface{}{
						bson.M{"$split": []string{"$backend_list", ":"}},
						0,
					},
				},
			},
		},
		{
			"$match": bson.M{
				"extracted_ip": bson.M{"$in": ips},
			},
		},
		{
			"$group": bson.M{
				"_id":   "$extracted_ip",
				"count": bson.M{"$sum": 1},
			},
		},
		{
			"$project": bson.M{
				"_id":   0,
				"ip":    "$_id",
				"count": 1,
			},
		},
	}

	var results []v1.IpCountResult
	err := r.MongoDB.Collection("udp_forwarding_rules").Aggregate(ctx, pipeline).All(&results)
	if err != nil {
		return nil, fmt.Errorf("聚合查询 udp_forwarding_rules 失败: %w", err)
	}
	return results, nil
}

func (r *udpForWardingRepository) GetPortCount(ctx context.Context, hostId int64, port string) (int64, error) {
	var count int64
	if err := r.Db.WithContext(ctx).Model(&model.UdpForWarding{}).Where("host_id = ? AND port = ?", hostId, port).Count(&count).Error; err != nil {
		return 0, err
	}
	return count, nil
}

func (r *udpForWardingRepository) GetUdpAll(ctx context.Context, hostIds []int) ([]int, error) {
	var res []int
	if err:= r.Db.WithContext(ctx).Model(&model.UdpForWarding{}).Where("host_id IN ?", hostIds).Select("cdn_web_id").Scan(&res).Error; err != nil {
		return nil, err
	}
	return res, nil
}