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

import (
  "context"
  "fmt"
_ "os"
_ "gopkg.in/yaml.v3"
_ "os/exec"
_ "strings"
  "log"
  "github.com/docker/docker/api/types/container"
  "github.com/docker/docker/api/types/filters"
  "github.com/docker/docker/api/types"
  "github.com/docker/docker/client"
  "github.com/docker/docker/api/types/network"                                                                                                                                                              
  ocispec "github.com/opencontainers/image-spec/specs-go/v1"                                                                                                                                                
  "gopkg.in/yaml.v3"
  "net/url"
  "path/filepath"
)

type ContainerClient interface {
  ContainerCreate(ctx context.Context, config *container.Config, hostConfig *container.HostConfig, networkingConfig *network.NetworkingConfig, platform *ocispec.Platform, containerName string) (container.CreateResponse, error)
  ContainerList(context.Context, types.ContainerListOptions) ([]types.Container, error)
  ContainerInspect(context.Context, string) (types.ContainerJSON, error)
  ContainerRemove(context.Context, string, container.RemoveOptions) error
  Close() error
}

type Container struct {
  loader YamlLoader
  Id string `yaml:"ID",omitempty`
  Name string `yaml:"name"`
  Path string `yaml:"path"`
  Cmd []string `yaml:"cmd",omitempty`
  Args []string `yaml:"args",omitempty`
  Image string `yaml:"image"`
  ResolvConfPath string `yaml:"resolvconfpath"`
  HostnamePath string `yaml:"hostnamepath"`
  HostsPath string `yaml:"hostspath"`
  LogPath string `yaml:"logpath"`
  Created string `yaml:"created"`
  ContainerState types.ContainerState `yaml:"containerstate"`
  RestartCount int `yaml:"restartcount"`
  Driver string `yaml:"driver"`
  Platform string `yaml:"platform"`
  MountLabel string `yaml:"mountlabel"`
  ProcessLabel string `yaml:"processlabel"`
  AppArmorProfile string `yaml:"apparmorprofile"`
  ExecIDs []string `yaml:"execids"`
  HostConfig *container.HostConfig `yaml:"hostconfig"`
  GraphDriver types.GraphDriverData `yaml:"graphdriver"`
  SizeRw *int64 `json:",omitempty"`
  SizeRootFs *int64 `json:",omitempty"`
/*
Mounts          []MountPoint
Config          *container.Config
NetworkSettings *NetworkSettings
*/

  State string `yaml:"state"`

  apiClient ContainerClient
}

func init() {
  ResourceTypes.Register("container", func(u *url.URL) Resource {
    c := NewContainer(nil)
    c.Name = filepath.Join(u.Hostname(), u.Path)
    return c
  })
}

func NewContainer(containerClientApi ContainerClient) *Container {
  var apiClient ContainerClient = containerClientApi
  if apiClient == nil {
    var err error
    apiClient, err = client.NewClientWithOpts(client.FromEnv)
    if err != nil {
      panic(err)
    }
  }
  return &Container{
    loader: YamlLoadDecl,
    apiClient: apiClient,
  }
}

func (c *Container) URI() string {
  return fmt.Sprintf("container://%s", c.Id)
}

func (c *Container) SetURI(uri string) error {
  resourceUri, e := url.Parse(uri)
  if resourceUri.Scheme == c.Type() {
    c.Name, e = filepath.Abs(filepath.Join(resourceUri.Hostname(), resourceUri.RequestURI()))
  } else {
    e = fmt.Errorf("%w: %s is not a %s", ErrInvalidResourceURI, uri, c.Type())
  }
  return e
}

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

func (c *Container) LoadDecl(yamlFileResourceDeclaration string) error {
  return c.loader(yamlFileResourceDeclaration, c)
}

/*
	apiClient, err := client.NewClientWithOpts(client.FromEnv)
	if err != nil {
		panic(err)
	}
	defer apiClient.Close()

	containers, err := apiClient.ContainerList(context.Background(), container.ListOptions{All: true})
	if err != nil {
		panic(err)
	}

	for _, ctr := range containers {
		fmt.Printf("%s %s (status: %s)\n", ctr.ID, ctr.Image, ctr.Status)
	}
}
*/

func (c *Container) Create(ctx context.Context) error {
  config := &container.Config {
    Image: c.Image,
    Cmd: c.Cmd,
    Tty: false,
  }
  resp, err := c.apiClient.ContainerCreate(ctx, config, nil, nil, nil, c.Name)
  if err != nil {
    panic(err)
  }
  c.Id = resp.ID

/*
  statusCh, errCh := cli.ContainerWait(ctx, resp.ID, container.WaitConditionNotRunning)
  select {
  case err := <-errCh:
    if err != nil {
      panic(err)
    }
  case <-statusCh:
  }
*/
  return err
}

// produce yaml representation of any resource

func (c *Container) Read(ctx context.Context) ([]byte, error) {
  var containerID string
  filterArgs := filters.NewArgs()
  filterArgs.Add("name", "/" + c.Name)
  containers,err := c.apiClient.ContainerList(ctx, types.ContainerListOptions{
    All:     true,
    Filters: filterArgs,
  })
  if err != nil {
    panic(fmt.Errorf("%w: %s %s", err, c.Type(), c.Name))
  }

  for _, container := range containers {
    for _, containerName := range container.Names {
      if containerName == c.Name {
        containerID = container.ID
      }
    }
  }

  containerJSON, err := c.apiClient.ContainerInspect(ctx, containerID)
  if client.IsErrNotFound(err) {
    c.State = "absent"
  } else {
    c.State = "present"
    c.Id = containerJSON.ID
    c.Name = containerJSON.Name
    c.Path = containerJSON.Path
    c.Image = containerJSON.Image
    if containerJSON.State != nil {
      c.ContainerState = *containerJSON.State
    }
    c.Created = containerJSON.Created
    c.ResolvConfPath = containerJSON.ResolvConfPath
    c.HostnamePath = containerJSON.HostnamePath
    c.HostsPath = containerJSON.HostsPath
    c.LogPath = containerJSON.LogPath
    c.RestartCount = containerJSON.RestartCount
    c.Driver = containerJSON.Driver
  }
  return yaml.Marshal(c)
}


func (c *Container) Delete(ctx context.Context) error {
  err := c.apiClient.ContainerRemove(ctx, c.Id, types.ContainerRemoveOptions{
    RemoveVolumes: true,
    Force: false,
  })
  if err != nil {
    log.Printf("Failed to remove: %s\n", c.Id)
    panic(err)
  }
  return err
}

func (c *Container) Type() string { return "container" }

func (c *Container) ResolveId(ctx context.Context) string {
  filterArgs := filters.NewArgs()
  filterArgs.Add("name", "/" + c.Name)
  containers,err := c.apiClient.ContainerList(ctx, types.ContainerListOptions{
    All:     true,
    Filters: filterArgs,
  })
  if err != nil {
    panic(fmt.Errorf("%w: %s %s", err, c.Type(), c.Name))
  }

  for _, container := range containers {
    for _, containerName := range container.Names {
      if containerName == c.Name {
        if c.Id == "" {
	  c.Id = container.ID
        }
        return container.ID
      }
    }
  }
  return "" 
}