package service

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
	"sort"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/1Panel-dev/1Panel/backend/app/dto"
	"github.com/1Panel-dev/1Panel/backend/buserr"
	"github.com/1Panel-dev/1Panel/backend/constant"
	"github.com/1Panel-dev/1Panel/backend/global"
	"github.com/1Panel-dev/1Panel/backend/utils/common"
	"github.com/1Panel-dev/1Panel/backend/utils/docker"
	"github.com/docker/docker/api/types"
	"github.com/docker/docker/api/types/container"
	"github.com/docker/docker/api/types/filters"
	"github.com/docker/docker/api/types/network"
	"github.com/docker/docker/client"
	"github.com/docker/go-connections/nat"
	v1 "github.com/opencontainers/image-spec/specs-go/v1"
)

type ContainerService struct{}

type IContainerService interface {
	Page(req dto.PageContainer) (int64, interface{}, error)
	PageNetwork(req dto.SearchWithPage) (int64, interface{}, error)
	PageVolume(req dto.SearchWithPage) (int64, interface{}, error)
	ListVolume() ([]dto.Options, error)
	PageCompose(req dto.SearchWithPage) (int64, interface{}, error)
	CreateCompose(req dto.ComposeCreate) (string, error)
	ComposeOperation(req dto.ComposeOperation) error
	ContainerCreate(req dto.ContainerCreate) error
	ContainerLogClean(req dto.OperationWithName) error
	ContainerOperation(req dto.ContainerOperation) error
	ContainerLogs(param dto.ContainerLog) (string, error)
	ContainerStats(id string) (*dto.ContainterStats, error)
	Inspect(req dto.InspectReq) (string, error)
	DeleteNetwork(req dto.BatchDelete) error
	CreateNetwork(req dto.NetworkCreate) error
	DeleteVolume(req dto.BatchDelete) error
	CreateVolume(req dto.VolumeCreate) error
	TestCompose(req dto.ComposeCreate) (bool, error)
	ComposeUpdate(req dto.ComposeUpdate) error
	Prune(req dto.ContainerPrune) (dto.ContainerPruneReport, error)
}

func NewIContainerService() IContainerService {
	return &ContainerService{}
}

func (u *ContainerService) Page(req dto.PageContainer) (int64, interface{}, error) {
	var (
		records   []types.Container
		list      []types.Container
		backDatas []dto.ContainerInfo
	)
	client, err := docker.NewDockerClient()
	if err != nil {
		return 0, nil, err
	}
	options := types.ContainerListOptions{All: true}
	if len(req.Filters) != 0 {
		options.Filters = filters.NewArgs()
		options.Filters.Add("label", req.Filters)
	}
	list, err = client.ContainerList(context.Background(), options)
	if err != nil {
		return 0, nil, err
	}
	if len(req.Name) != 0 {
		length, count := len(list), 0
		for count < length {
			if !strings.Contains(list[count].Names[0][1:], req.Name) {
				list = append(list[:count], list[(count+1):]...)
				length--
			} else {
				count++
			}
		}
	}
	sort.Slice(list, func(i, j int) bool {
		return list[i].Created > list[j].Created
	})
	total, start, end := len(list), (req.Page-1)*req.PageSize, req.Page*req.PageSize
	if start > total {
		records = make([]types.Container, 0)
	} else {
		if end >= total {
			end = total
		}
		records = list[start:end]
	}

	var wg sync.WaitGroup
	wg.Add(len(records))
	for _, container := range records {
		go func(item types.Container) {
			IsFromCompose := false
			if _, ok := item.Labels[composeProjectLabel]; ok {
				IsFromCompose = true
			}
			IsFromApp := false
			if created, ok := item.Labels[composeCreatedBy]; ok && created == "Apps" {
				IsFromApp = true
			}

			var ports []string
			for _, port := range item.Ports {
				if port.IP == "::" || port.PublicPort == 0 {
					continue
				}
				ports = append(ports, fmt.Sprintf("%v:%v/%s", port.PublicPort, port.PrivatePort, port.Type))
			}
			cpu, mem := loadCpuAndMem(client, item.ID)
			backDatas = append(backDatas, dto.ContainerInfo{
				ContainerID:   item.ID,
				CreateTime:    time.Unix(item.Created, 0).Format("2006-01-02 15:04:05"),
				Name:          item.Names[0][1:],
				ImageId:       strings.Split(item.ImageID, ":")[1],
				ImageName:     item.Image,
				State:         item.State,
				RunTime:       item.Status,
				CPUPercent:    cpu,
				MemoryPercent: mem,
				Ports:         ports,
				IsFromApp:     IsFromApp,
				IsFromCompose: IsFromCompose,
			})
			wg.Done()
		}(container)
	}
	wg.Wait()

	return int64(total), backDatas, nil
}

func (u *ContainerService) Inspect(req dto.InspectReq) (string, error) {
	client, err := docker.NewDockerClient()
	if err != nil {
		return "", err
	}
	var inspectInfo interface{}
	switch req.Type {
	case "container":
		inspectInfo, err = client.ContainerInspect(context.Background(), req.ID)
	case "network":
		inspectInfo, err = client.NetworkInspect(context.TODO(), req.ID, types.NetworkInspectOptions{})
	case "volume":
		inspectInfo, err = client.VolumeInspect(context.TODO(), req.ID)
	}
	if err != nil {
		return "", err
	}
	bytes, err := json.Marshal(inspectInfo)
	if err != nil {
		return "", err
	}
	return string(bytes), nil
}

func (u *ContainerService) Prune(req dto.ContainerPrune) (dto.ContainerPruneReport, error) {
	report := dto.ContainerPruneReport{}
	client, err := docker.NewDockerClient()
	if err != nil {
		return report, err
	}
	pruneFilters := filters.NewArgs()
	if req.WithTagAll {
		pruneFilters.Add("dangling", "false")
		if req.PruneType != "image" {
			pruneFilters.Add("until", "24h")
		}
	}
	switch req.PruneType {
	case "container":
		rep, err := client.ContainersPrune(context.Background(), pruneFilters)
		if err != nil {
			return report, err
		}
		report.DeletedNumber = len(rep.ContainersDeleted)
		report.SpaceReclaimed = int(rep.SpaceReclaimed)
	case "image":
		rep, err := client.ImagesPrune(context.Background(), pruneFilters)
		if err != nil {
			return report, err
		}
		report.DeletedNumber = len(rep.ImagesDeleted)
		report.SpaceReclaimed = int(rep.SpaceReclaimed)
	case "network":
		rep, err := client.NetworksPrune(context.Background(), pruneFilters)
		if err != nil {
			return report, err
		}
		report.DeletedNumber = len(rep.NetworksDeleted)
	case "volume":
		rep, err := client.VolumesPrune(context.Background(), pruneFilters)
		if err != nil {
			return report, err
		}
		report.DeletedNumber = len(rep.VolumesDeleted)
		report.SpaceReclaimed = int(rep.SpaceReclaimed)
	}
	return report, nil
}

func (u *ContainerService) ContainerCreate(req dto.ContainerCreate) error {
	portMap, err := checkPortStats(req.ExposedPorts)
	if err != nil {
		return err
	}
	client, err := docker.NewDockerClient()
	if err != nil {
		return err
	}

	exposeds := make(nat.PortSet)
	for port := range portMap {
		exposeds[port] = struct{}{}
	}
	config := &container.Config{
		Image:        req.Image,
		Cmd:          req.Cmd,
		Env:          req.Env,
		Labels:       stringsToMap(req.Labels),
		Tty:          true,
		OpenStdin:    true,
		ExposedPorts: exposeds,
	}
	hostConf := &container.HostConfig{
		AutoRemove:      req.AutoRemove,
		PublishAllPorts: req.PublishAllPorts,
		RestartPolicy:   container.RestartPolicy{Name: req.RestartPolicy},
	}
	if req.RestartPolicy == "on-failure" {
		hostConf.RestartPolicy.MaximumRetryCount = 5
	}
	if req.NanoCPUs != 0 {
		hostConf.NanoCPUs = req.NanoCPUs * 1000000000
	}
	if req.Memory != 0 {
		hostConf.Memory = req.Memory
	}
	if len(req.ExposedPorts) != 0 {
		hostConf.PortBindings = portMap
	}
	if len(req.Volumes) != 0 {
		config.Volumes = make(map[string]struct{})
		for _, volume := range req.Volumes {
			config.Volumes[volume.ContainerDir] = struct{}{}
			hostConf.Binds = append(hostConf.Binds, fmt.Sprintf("%s:%s:%s", volume.SourceDir, volume.ContainerDir, volume.Mode))
		}
	}

	global.LOG.Infof("new container info %s has been made, now start to create", req.Name)

	ctx := context.Background()
	if !checkImageExist(client, req.Image) {
		if err := pullImages(ctx, client, req.Image); err != nil {
			return err
		}
	}
	container, err := client.ContainerCreate(ctx, config, hostConf, &network.NetworkingConfig{}, &v1.Platform{}, req.Name)
	if err != nil {
		_ = client.ContainerRemove(ctx, req.Name, types.ContainerRemoveOptions{RemoveVolumes: true, Force: true})
		return err
	}
	global.LOG.Infof("create container %s successful! now check if the container is started and delete the container information if it is not.", req.Name)
	if err := client.ContainerStart(ctx, container.ID, types.ContainerStartOptions{}); err != nil {
		_ = client.ContainerRemove(ctx, req.Name, types.ContainerRemoveOptions{RemoveVolumes: true, Force: true})
		return fmt.Errorf("create successful but start failed, err: %v", err)
	}
	return nil
}

func (u *ContainerService) ContainerOperation(req dto.ContainerOperation) error {
	var err error
	ctx := context.Background()
	client, err := docker.NewDockerClient()
	if err != nil {
		return err
	}
	global.LOG.Infof("start container %s operation %s", req.Name, req.Operation)
	switch req.Operation {
	case constant.ContainerOpStart:
		err = client.ContainerStart(ctx, req.Name, types.ContainerStartOptions{})
	case constant.ContainerOpStop:
		err = client.ContainerStop(ctx, req.Name, container.StopOptions{})
	case constant.ContainerOpRestart:
		err = client.ContainerRestart(ctx, req.Name, container.StopOptions{})
	case constant.ContainerOpKill:
		err = client.ContainerKill(ctx, req.Name, "SIGKILL")
	case constant.ContainerOpPause:
		err = client.ContainerPause(ctx, req.Name)
	case constant.ContainerOpUnpause:
		err = client.ContainerUnpause(ctx, req.Name)
	case constant.ContainerOpRename:
		err = client.ContainerRename(ctx, req.Name, req.NewName)
	case constant.ContainerOpRemove:
		err = client.ContainerRemove(ctx, req.Name, types.ContainerRemoveOptions{RemoveVolumes: true, Force: true})
	}
	return err
}

func (u *ContainerService) ContainerLogClean(req dto.OperationWithName) error {
	client, err := docker.NewDockerClient()
	if err != nil {
		return err
	}
	container, err := client.ContainerInspect(context.Background(), req.Name)
	if err != nil {
		return err
	}
	file, err := os.OpenFile(container.LogPath, os.O_RDWR|os.O_CREATE, 0666)
	if err != nil {
		return err
	}
	defer file.Close()
	if err = file.Truncate(0); err != nil {
		return err
	}
	_, _ = file.Seek(0, 0)
	return nil
}

func (u *ContainerService) ContainerLogs(req dto.ContainerLog) (string, error) {
	cmd := exec.Command("docker", "logs", req.ContainerID)
	if req.Mode != "all" {
		cmd = exec.Command("docker", "logs", req.ContainerID, "--since", req.Mode)
	}
	stdout, err := cmd.CombinedOutput()
	if err != nil {
		return "", errors.New(string(stdout))
	}
	return string(stdout), nil
}

func (u *ContainerService) ContainerStats(id string) (*dto.ContainterStats, error) {
	client, err := docker.NewDockerClient()
	if err != nil {
		return nil, err
	}
	res, err := client.ContainerStats(context.TODO(), id, false)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)
	if err != nil {
		res.Body.Close()
		return nil, err
	}
	res.Body.Close()
	var stats *types.StatsJSON
	if err := json.Unmarshal(body, &stats); err != nil {
		return nil, err
	}
	var data dto.ContainterStats
	data.CPUPercent = calculateCPUPercentUnix(stats)
	data.IORead, data.IOWrite = calculateBlockIO(stats.BlkioStats)
	data.Memory = float64(stats.MemoryStats.Usage) / 1024 / 1024
	if cache, ok := stats.MemoryStats.Stats["cache"]; ok {
		data.Cache = float64(cache) / 1024 / 1024
	}
	data.Memory = data.Memory - data.Cache
	data.NetworkRX, data.NetworkTX = calculateNetwork(stats.Networks)
	data.ShotTime = stats.Read
	return &data, nil
}

func stringsToMap(list []string) map[string]string {
	var lableMap = make(map[string]string)
	for _, label := range list {
		if strings.Contains(label, "=") {
			sps := strings.SplitN(label, "=", 2)
			lableMap[sps[0]] = sps[1]
		}
	}
	return lableMap
}

func calculateCPUPercentUnix(stats *types.StatsJSON) float64 {
	cpuPercent := 0.0
	cpuDelta := float64(stats.CPUStats.CPUUsage.TotalUsage) - float64(stats.PreCPUStats.CPUUsage.TotalUsage)
	systemDelta := float64(stats.CPUStats.SystemUsage) - float64(stats.PreCPUStats.SystemUsage)

	if systemDelta > 0.0 && cpuDelta > 0.0 {
		cpuPercent = (cpuDelta / systemDelta) * 100.0
		if len(stats.CPUStats.CPUUsage.PercpuUsage) != 0 {
			cpuPercent = cpuPercent * float64(len(stats.CPUStats.CPUUsage.PercpuUsage))
		}
	}
	return cpuPercent
}
func calculateMemPercentUnix(memStats types.MemoryStats) float64 {
	memPercent := 0.0
	memUsage := float64(memStats.Usage - memStats.Stats["cache"])
	memLimit := float64(memStats.Limit)
	if memUsage > 0.0 && memLimit > 0.0 {
		memPercent = (memUsage / memLimit) * 100.0
	}
	return memPercent
}
func calculateBlockIO(blkio types.BlkioStats) (blkRead float64, blkWrite float64) {
	for _, bioEntry := range blkio.IoServiceBytesRecursive {
		switch strings.ToLower(bioEntry.Op) {
		case "read":
			blkRead = (blkRead + float64(bioEntry.Value)) / 1024 / 1024
		case "write":
			blkWrite = (blkWrite + float64(bioEntry.Value)) / 1024 / 1024
		}
	}
	return
}
func calculateNetwork(network map[string]types.NetworkStats) (float64, float64) {
	var rx, tx float64

	for _, v := range network {
		rx += float64(v.RxBytes) / 1024
		tx += float64(v.TxBytes) / 1024
	}
	return rx, tx
}

func checkImageExist(client *client.Client, image string) bool {
	images, err := client.ImageList(context.Background(), types.ImageListOptions{})
	if err != nil {
		fmt.Println(err)
		return false
	}

	for _, img := range images {
		for _, tag := range img.RepoTags {
			if tag == image || tag == image+":latest" {
				return true
			}
		}
	}
	return false
}

func pullImages(ctx context.Context, client *client.Client, image string) error {
	out, err := client.ImagePull(ctx, image, types.ImagePullOptions{})
	if err != nil {
		return err
	}
	defer out.Close()
	_, err = io.Copy(io.Discard, out)
	if err != nil {
		return err
	}
	return nil
}

func loadCpuAndMem(client *client.Client, container string) (float64, float64) {
	res, err := client.ContainerStats(context.Background(), container, false)
	if err != nil {
		return 0, 0
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		res.Body.Close()
		return 0, 0
	}
	res.Body.Close()
	var stats *types.StatsJSON
	if err := json.Unmarshal(body, &stats); err != nil {
		return 0, 0
	}

	CPUPercent := calculateCPUPercentUnix(stats)
	MemPercent := calculateMemPercentUnix(stats.MemoryStats)
	return CPUPercent, MemPercent
}

func checkPortStats(ports []dto.PortHelper) (nat.PortMap, error) {
	portMap := make(nat.PortMap)
	if len(ports) == 0 {
		return portMap, nil
	}
	for _, port := range ports {
		if strings.Contains(port.ContainerPort, "-") {
			if !strings.Contains(port.HostPort, "-") {
				return portMap, buserr.New(constant.ErrPortRules)
			}
			hostStart, _ := strconv.Atoi(strings.Split(port.HostPort, "-")[0])
			hostEnd, _ := strconv.Atoi(strings.Split(port.HostPort, "-")[1])
			containerStart, _ := strconv.Atoi(strings.Split(port.ContainerPort, "-")[0])
			containerEnd, _ := strconv.Atoi(strings.Split(port.ContainerPort, "-")[1])
			if (hostEnd-hostStart) <= 0 || (containerEnd-containerStart) <= 0 {
				return portMap, buserr.New(constant.ErrPortRules)
			}
			if (containerEnd - containerStart) != (hostEnd - hostStart) {
				return portMap, buserr.New(constant.ErrPortRules)
			}
			for i := 0; i <= hostEnd-hostStart; i++ {
				bindItem := nat.PortBinding{HostPort: strconv.Itoa(hostStart + i), HostIP: port.HostIP}
				portMap[nat.Port(fmt.Sprintf("%d/%s", containerStart+i, port.Protocol))] = []nat.PortBinding{bindItem}
			}
			for i := hostStart; i <= hostEnd; i++ {
				if common.ScanPort(i) {
					return portMap, buserr.WithDetail(constant.ErrPortInUsed, i, nil)
				}
			}
		} else {
			portItem := 0
			if strings.Contains(port.HostPort, "-") {
				portItem, _ = strconv.Atoi(strings.Split(port.HostPort, "-")[0])
			} else {
				portItem, _ = strconv.Atoi(port.HostPort)
			}
			if common.ScanPort(portItem) {
				return portMap, buserr.WithDetail(constant.ErrPortInUsed, portItem, nil)
			}
			bindItem := nat.PortBinding{HostPort: strconv.Itoa(portItem), HostIP: port.HostIP}
			portMap[nat.Port(fmt.Sprintf("%s/%s", port.ContainerPort, port.Protocol))] = []nat.PortBinding{bindItem}
		}
	}
	return portMap, nil
}