// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package resource

import (
	"context"
	"fmt"
	"github.com/docker/docker/api/types/filters"
	"github.com/docker/docker/api/types/volume"
_	"github.com/docker/docker/api/types/strslice"
	"github.com/docker/docker/client"
	"gopkg.in/yaml.v3"
_	"log/slog"
	"net/url"
_	"os"
_	"os/exec"
_	"strings"
	"encoding/json"
	"io"
	"gitea.rosskeen.house/rosskeen.house/machine"
	"decl/internal/codec"
	"decl/internal/data"
	"decl/internal/folio"
	"log/slog"
)

const (
	ContainerVolumeTypeName TypeName = "container-volume"
)

type ContainerVolumeClient interface {
	ContainerClient
	VolumeCreate(ctx context.Context, options volume.CreateOptions) (volume.Volume, error)
	VolumeList(ctx context.Context, options volume.ListOptions) (volume.ListResponse, error)
	VolumeInspect(ctx context.Context, volumeID string) (volume.Volume, error)
	VolumeRemove(ctx context.Context, volumeID string, force bool) (error)
}

type ContainerVolume struct {
	*Common													`json:",inline" yaml:",inline"`
	stater				machine.Stater		`json:"-" yaml:"-"`
	volume.Volume													`json:",inline" yaml:",inline"`

	apiClient		ContainerVolumeClient
	Resources		data.ResourceMapper `json:"-" yaml:"-"`
}

func init() {
	folio.DocumentRegistry.ResourceTypes.Register([]string{"container-volume"}, func(u *url.URL) (n data.Resource) {
		n = NewContainerVolume(nil)
		if u != nil {
			if err := folio.CastParsedURI(u).ConstructResource(n); err != nil {
				panic(err)
			}
		}
		return
	})
}

func NewContainerVolume(containerClientApi ContainerVolumeClient) (cn *ContainerVolume) {
	var apiClient ContainerVolumeClient = containerClientApi
	if apiClient == nil {
		var err error
		apiClient, err = client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
		if err != nil {
			panic(err)
		}
	}
	cn = &ContainerVolume{
		apiClient: apiClient,
	}
	cn.Common = NewCommon(ContainerVolumeTypeName, true)
	cn.Common.NormalizePath = cn.NormalizePath
	return cn
}

func (v *ContainerVolume) Init(u data.URIParser) error {
	if u == nil {
		u = folio.URI(v.URI()).Parse()
	}
	return v.SetParsedURI(u)
}

func (v *ContainerVolume) NormalizePath() error {
	return nil
}

func (v *ContainerVolume) SetResourceMapper(resources data.ResourceMapper) {
	v.Resources = resources
}

func (v *ContainerVolume) Clone() data.Resource {
	return &ContainerVolume {
		Common: v.Common.Clone(),
		Volume: v.Volume,
		apiClient: v.apiClient,
	}
}

func (v *ContainerVolume) StateMachine() machine.Stater {
	if v.stater == nil {
		v.stater = StorageMachine(v)
	}
	return v.stater
}

func (v *ContainerVolume) Notify(m *machine.EventMessage) {
  ctx := context.Background()
	slog.Info("Notify()", "ContainerVolume", v, "m", m)
  switch m.On {
  case machine.ENTERSTATEEVENT:
    switch m.Dest {
		case "start_read":
			if _,readErr := v.Read(ctx); readErr == nil {
				if triggerErr := v.StateMachine().Trigger("state_read"); triggerErr == nil {
					return
				} else {
					v.Common.State = "absent"
					panic(triggerErr)
				}
			} else {
				v.Common.State = "absent"
				panic(readErr)
			}
		case "start_delete":
			if deleteErr := v.Delete(ctx); deleteErr == nil {
				if triggerErr := v.StateMachine().Trigger("deleted"); triggerErr == nil {
					return
				} else {
					v.Common.State = "present"
					panic(triggerErr)
				}
			} else {
				v.Common.State = "present"
				panic(deleteErr)
			}
    case "start_create":
      if e := v.Create(ctx); e == nil {
				if triggerErr := v.StateMachine().Trigger("created"); triggerErr == nil {
					return
				}
			}
			v.Common.State = "absent"
		case "absent":
			v.Common.State = "absent"
		case "present", "created", "read":
      v.Common.State = "present"
    }
  case machine.EXITSTATEEVENT:
  }
}

func (v *ContainerVolume) URI() string {
	return fmt.Sprintf("container-volume://%s", v.Name)
}

func (v *ContainerVolume) JSON() ([]byte, error) {
	return json.Marshal(v)
}

func (v *ContainerVolume) Validate() error {
	return fmt.Errorf("failed")
}

func (v *ContainerVolume) Apply() error {
	ctx := context.Background()
	switch v.Common.State {
	case "absent":
		return v.Delete(ctx)
	case "present":
		return v.Create(ctx)
	}
	return nil
}

func (v *ContainerVolume) Load(docData []byte, f codec.Format) (err error) {
	err = f.StringDecoder(string(docData)).Decode(v)
	return
}

func (v *ContainerVolume) LoadReader(r io.ReadCloser, f codec.Format) (err error) {
	err = f.Decoder(r).Decode(v)
	return
}

func (v *ContainerVolume) LoadString(docData string, f codec.Format) (err error) {
	err = f.StringDecoder(docData).Decode(v)
	return
}

func (n *ContainerVolume) LoadDecl(yamlResourceDeclaration string) error {
	return n.LoadString(yamlResourceDeclaration, codec.FormatYaml)
}

func (v *ContainerVolume) Create(ctx context.Context) (err error) {
	var spec volume.ClusterVolumeSpec
	if v.ClusterVolume != nil {
		spec = v.ClusterVolume.Spec
	}
	v.Volume, err = v.apiClient.VolumeCreate(ctx, volume.CreateOptions{
		Name: v.Name,
		Driver: v.Driver,
		DriverOpts: v.Options,
		Labels: v.Labels,
		ClusterVolumeSpec: &spec,
	})
	if err != nil {
		panic(err)
	}
	return nil
}

func (v *ContainerVolume) Inspect(ctx context.Context, volumeID string) error {
	volumeInspect, err := v.apiClient.VolumeInspect(ctx, volumeID)
	if client.IsErrNotFound(err) {
		v.Common.State = "absent"
	} else {
		v.Common.State = "present"
		v.Volume = volumeInspect
		if v.Name == "" {
			if volumeInspect.Name[0] == '/' {
				v.Name = volumeInspect.Name[1:]
			} else {
				v.Name = volumeInspect.Name
			}
		}
	}
	return nil
}

func (v *ContainerVolume) Read(ctx context.Context) ([]byte, error) {
	var volumeID string
	filterArgs := filters.NewArgs()
	filterArgs.Add("name", v.Name)
	volumes, err := v.apiClient.VolumeList(ctx, volume.ListOptions{
		Filters: filterArgs,
	})

	if err != nil {
		return nil, fmt.Errorf("%w: %s %s", err, v.Type(), v.Name)
	}

	for _, vol := range volumes.Volumes {
		if vol.Name == v.Name {
			volumeID = vol.Name
		}
	}

	if inspectErr := v.Inspect(ctx, volumeID); inspectErr != nil {
		return nil, fmt.Errorf("%w: volume %s", inspectErr, volumeID)
	}
	slog.Info("Read() ", "type", v.Type(), "name", v.Name)
	
	return yaml.Marshal(v)
}

func (v *ContainerVolume) Update(ctx context.Context) error {
	return v.Create(ctx)
}

func (v *ContainerVolume) Delete(ctx context.Context) error {
	return nil
}

func (v *ContainerVolume) Type() string { return "container-volume" }

func (v *ContainerVolume) ResolveId(ctx context.Context) string {
	v.Inspect(ctx, v.Name)
	return v.Name
/*
	volumes, err := n.apiClient.VolumeInspect(ctx, volume.ListOptions{
	
	filterArgs := filters.NewArgs()
	filterArgs.Add("name", "/"+n.Name)
	volumes, err := n.apiClient.VolumeList(ctx, volume.ListOptions{
		All:     true,
		Filters: filterArgs,
	})
	if err != nil {
		panic(fmt.Errorf("%w: %s %s", err, n.Type(), n.Name))
	}

	for _, volume := range volumes {
		for _, containerName := range volume.Name {
			if containerName == n.Name {
				if n.Id == "" {
					n.Id = container.ID
				}
				return container.ID
			}
		}
	}
	return ""
*/
}