// Create is an operation which provisions a new security group with default
// security group rules for the IPv4 and IPv6 ether types.
func Create(c *gophercloud.ServiceClient, opts CreateOpts) CreateResult {
	var res CreateResult

	// Validate required opts
	if opts.Name == "" {
		res.Err = errNameRequired
		return res
	}

	type secgroup struct {
		Name        string `json:"name"`
		Description string `json:"description,omitempty"`
	}

	type request struct {
		SecGroup secgroup `json:"security_group"`
	}

	reqBody := request{SecGroup: secgroup{
		Name:        opts.Name,
		Description: opts.Description,
	}}

	_, res.Err = c.Post(rootURL(c), reqBody, &res.Body, nil)
	return res
}

// Create is a function that creates a new object or replaces an existing object.
func Create(c *gophercloud.ServiceClient, containerName, objectName string, content io.ReadSeeker, opts CreateOptsBuilder) CreateResult {
	var res CreateResult

	url := createURL(c, containerName, objectName)
	h := make(map[string]string)

	if opts != nil {
		headers, query, err := opts.ToObjectCreateParams()
		if err != nil {
			res.Err = err
			return res
		}

		for k, v := range headers {
			h[k] = v
		}

		url += query
	}

	ropts := gophercloud.RequestOpts{
		RawBody:     content,
		MoreHeaders: h,
	}

	resp, err := c.Request("PUT", url, ropts)
	if resp != nil {
		res.Header = resp.Header
	}
	res.Err = err
	return res
}

// Delete is a function that deletes a container.
func Delete(c *gophercloud.ServiceClient, containerName string) DeleteResult {
	var res DeleteResult
	_, res.Err = c.Delete(deleteURL(c, containerName), &gophercloud.RequestOpts{
		ErrorContext: &ContainerError{name: containerName},
	})
	return res
}

// Update is a function that creates, updates, or deletes an object's metadata.
func Update(c *gophercloud.ServiceClient, containerName, objectName string, opts UpdateOptsBuilder) UpdateResult {
	var res UpdateResult
	h := c.AuthenticatedHeaders()

	if opts != nil {
		headers, err := opts.ToObjectUpdateMap()
		if err != nil {
			res.Err = err
			return res
		}

		for k, v := range headers {
			h[k] = v
		}
	}

	url := updateURL(c, containerName, objectName)
	resp, err := c.Request("POST", url, gophercloud.RequestOpts{
		MoreHeaders: h,
	})
	if resp != nil {
		res.Header = resp.Header
	}
	res.Err = err
	return res
}

// Get is a function that retrieves an account's metadata. To extract just the
// custom metadata, call the ExtractMetadata method on the GetResult. To extract
// all the headers that are returned (including the metadata), call the
// ExtractHeader method on the GetResult.
func Get(c *gophercloud.ServiceClient, opts GetOptsBuilder) GetResult {
	var res GetResult
	h := c.AuthenticatedHeaders()

	if opts != nil {
		headers, err := opts.ToAccountGetMap()
		if err != nil {
			res.Err = err
			return res
		}

		for k, v := range headers {
			h[k] = v
		}
	}

	resp, err := c.Request("HEAD", getURL(c), gophercloud.RequestOpts{
		MoreHeaders: h,
		OkCodes:     []int{204},
	})
	if resp != nil {
		res.Header = resp.Header
	}
	res.Err = err
	return res
}

// Reboot requests that a given server reboot.
// Two methods exist for rebooting a server:
//
// HardReboot (aka PowerCycle) restarts the server instance by physically cutting power to the machine, or if a VM,
// terminating it at the hypervisor level.
// It's done. Caput. Full stop.
// Then, after a brief while, power is restored or the VM instance restarted.
//
// SoftReboot (aka OSReboot) simply tells the OS to restart under its own procedures.
// E.g., in Linux, asking it to enter runlevel 6, or executing "sudo shutdown -r now", or by asking Windows to restart the machine.
func Reboot(client *gophercloud.ServiceClient, id string, how RebootMethod) ActionResult {
	var res ActionResult

	if (how != SoftReboot) && (how != HardReboot) {

		res.Err = &ErrInvalidHowParameterProvided{
			&gophercloud.InvalidInputError{
				BaseError: gophercloud.BaseError{
					Function: "servers.Reboot",
				},
				Argument: "how",
				Value:    how,
			},
		}
		return res
	}

	reqBody := struct {
		C map[string]string `json:"reboot"`
	}{
		map[string]string{"type": string(how)},
	}

	_, res.Err = client.Post(actionURL(client, id), reqBody, nil, &gophercloud.RequestOpts{
		ErrorContext: &ServerError{id: id},
	})
	return res
}

// Delete requests that a server previously provisioned be removed from your account.
func Delete(client *gophercloud.ServiceClient, id string) DeleteResult {
	var res DeleteResult
	_, res.Err = client.Delete(deleteURL(client, id), &gophercloud.RequestOpts{
		ErrorContext: &ServerError{id: id},
	})
	return res
}

// Revoke immediately makes specified token invalid.
func Revoke(c *gophercloud.ServiceClient, token string) RevokeResult {
	var res RevokeResult
	_, res.Err = c.Delete(tokenURL(c), &gophercloud.RequestOpts{
		MoreHeaders: subjectTokenHeaders(c, token),
	})
	return res
}

// Get requests details on a single server, by ID.
func Get(client *gophercloud.ServiceClient, id string) GetResult {
	var result GetResult
	_, result.Err = client.Get(getURL(client, id), &result.Body, &gophercloud.RequestOpts{
		OkCodes: []int{200, 203},
	})
	return result
}

// DeleteMetadatum will delete the key-value pair with the given key for the given server ID.
func DeleteMetadatum(client *gophercloud.ServiceClient, id, key string) DeleteMetadatumResult {
	var res DeleteMetadatumResult
	_, res.Err = client.Delete(metadatumURL(client, id, key), &gophercloud.RequestOpts{
		JSONResponse: &res.Body,
	})
	return res
}

// Create requests a server to be provisioned to the user in the current tenant.
func Create(client *gophercloud.ServiceClient, opts CreateOptsBuilder) CreateResult {
	var res CreateResult

	reqBody, err := opts.ToServerCreateMap()
	if err != nil {
		res.Err = err
		return res
	}

	// If ImageRef isn't provided, use ImageName to ascertain the image ID.
	if reqBody["server"].(map[string]interface{})["imageRef"].(string) == "" {
		imageName := reqBody["server"].(map[string]interface{})["imageName"].(string)
		if imageName == "" {
			res.Err = &ErrNeitherImageIDNorImageNameProvided{
				&gophercloud.InvalidInputError{
					BaseError: gophercloud.BaseError{
						Function: "servers.Create",
					},
					Argument: "ImageRef/ImageName",
				},
			}
			return res
		}
		imageID, err := images.IDFromName(client, imageName)
		if err != nil {
			res.Err = err
			return res
		}
		reqBody["server"].(map[string]interface{})["imageRef"] = imageID
	}
	delete(reqBody["server"].(map[string]interface{}), "imageName")

	// If FlavorRef isn't provided, use FlavorName to ascertain the flavor ID.
	if reqBody["server"].(map[string]interface{})["flavorRef"].(string) == "" {
		flavorName := reqBody["server"].(map[string]interface{})["flavorName"].(string)
		if flavorName == "" {
			res.Err = &ErrNeitherFlavorIDNorFlavorNameProvided{
				&gophercloud.InvalidInputError{
					BaseError: gophercloud.BaseError{
						Function: "servers.Create",
					},
					Argument: "FlavorRef/FlavorName",
				},
			}
			return res
		}
		flavorID, err := flavors.IDFromName(client, flavorName)
		if err != nil {
			res.Err = err
			return res
		}
		reqBody["server"].(map[string]interface{})["flavorRef"] = flavorID
	}
	delete(reqBody["server"].(map[string]interface{}), "flavorName")

	_, res.Err = client.Post(listURL(client), reqBody, &res.Body, &gophercloud.RequestOpts{
		ErrorContext: &ServerError{},
	})
	return res
}

// Download is a function that retrieves the content and metadata for an object.
// To extract just the content, pass the DownloadResult response to the
// ExtractContent function.
func Download(c *gophercloud.ServiceClient, containerName, objectName string, opts DownloadOptsBuilder) DownloadResult {
	var res DownloadResult

	url := downloadURL(c, containerName, objectName)
	h := c.AuthenticatedHeaders()

	if opts != nil {
		headers, query, err := opts.ToObjectDownloadParams()
		if err != nil {
			res.Err = err
			return res
		}

		for k, v := range headers {
			h[k] = v
		}

		url += query
	}

	resp, err := c.Request("GET", url, gophercloud.RequestOpts{
		MoreHeaders: h,
		OkCodes:     []int{200, 304},
	})
	if resp != nil {
		res.Header = resp.Header
		res.Body = resp.Body
	}
	res.Err = err

	return res
}

// Update is a function that creates, updates, or deletes an account's metadata.
// To extract the headers returned, call the Extract method on the UpdateResult.
func Update(c *gophercloud.ServiceClient, opts UpdateOptsBuilder) UpdateResult {
	var res UpdateResult
	h := make(map[string]string)

	if opts != nil {
		headers, err := opts.ToAccountUpdateMap()
		if err != nil {
			res.Err = err
			return res
		}
		for k, v := range headers {
			h[k] = v
		}
	}

	resp, err := c.Request("POST", updateURL(c), gophercloud.RequestOpts{
		MoreHeaders: h,
		OkCodes:     []int{201, 202, 204},
	})
	if resp != nil {
		res.Header = resp.Header
	}
	res.Err = err
	return res
}

// Metadatum requests the key-value pair with the given key for the given server ID.
func Metadatum(client *gophercloud.ServiceClient, id, key string) GetMetadatumResult {
	var res GetMetadatumResult
	_, res.Err = client.Request("GET", metadatumURL(client, id, key), gophercloud.RequestOpts{
		JSONResponse: &res.Body,
	})
	return res
}

// Copy is a function that copies one object to another.
func Copy(c *gophercloud.ServiceClient, containerName, objectName string, opts CopyOptsBuilder) CopyResult {
	var res CopyResult
	h := c.AuthenticatedHeaders()

	headers, err := opts.ToObjectCopyMap()
	if err != nil {
		res.Err = err
		return res
	}

	for k, v := range headers {
		h[k] = v
	}

	url := copyURL(c, containerName, objectName)
	resp, err := c.Request("COPY", url, gophercloud.RequestOpts{
		MoreHeaders: h,
		OkCodes:     []int{201},
	})
	if resp != nil {
		res.Header = resp.Header
	}
	res.Err = err
	return res
}

// Rescue instructs the provider to place the server into RESCUE mode.
func Rescue(client *gophercloud.ServiceClient, id string, opts RescueOptsBuilder) RescueResult {
	var result RescueResult

	if id == "" {
		result.Err = &ErrNoIDProvided{
			&gophercloud.InvalidInputError{
				BaseError: gophercloud.BaseError{
					Function: "servers.Rescue",
				},
				Argument: "id",
			},
		}
		return result
	}
	reqBody, err := opts.ToServerRescueMap()
	if err != nil {
		result.Err = err
		return result
	}

	_, result.Err = client.Post(actionURL(client, id), reqBody, &result.Body, &gophercloud.RequestOpts{
		OkCodes:      []int{200},
		ErrorContext: &ServerError{id: id},
	})

	return result
}

// Update requests that various attributes of the indicated server be changed.
func Update(client *gophercloud.ServiceClient, id string, opts UpdateOptsBuilder) UpdateResult {
	var result UpdateResult
	reqBody := opts.ToServerUpdateMap()
	_, result.Err = client.Put(updateURL(client, id), reqBody, &result.Body, &gophercloud.RequestOpts{
		OkCodes: []int{200},
	})
	return result
}

// RevertResize cancels a previous resize operation on a server.
// See Resize() for more details.
func RevertResize(client *gophercloud.ServiceClient, id string) ActionResult {
	var res ActionResult
	reqBody := map[string]interface{}{"revertResize": nil}
	_, res.Err = client.Post(actionURL(client, id), reqBody, nil, &gophercloud.RequestOpts{
		ErrorContext: &ServerError{id: id},
	})
	return res
}

// ConfirmResize confirms a previous resize operation on a server.
// See Resize() for more details.
func ConfirmResize(client *gophercloud.ServiceClient, id string) ActionResult {
	var res ActionResult

	reqBody := map[string]interface{}{"confirmResize": nil}
	_, res.Err = client.Post(actionURL(client, id), reqBody, nil, &gophercloud.RequestOpts{
		OkCodes: []int{201, 202, 204},
	})
	return res
}

// Resize instructs the provider to change the flavor of the server.
// Note that this implies rebuilding it.
// Unfortunately, one cannot pass rebuild parameters to the resize function.
// When the resize completes, the server will be in RESIZE_VERIFY state.
// While in this state, you can explore the use of the new server's configuration.
// If you like it, call ConfirmResize() to commit the resize permanently.
// Otherwise, call RevertResize() to restore the old configuration.
func Resize(client *gophercloud.ServiceClient, id string, opts ResizeOptsBuilder) ActionResult {
	var res ActionResult
	reqBody, err := opts.ToServerResizeMap()
	if err != nil {
		res.Err = err
		return res
	}

	_, res.Err = client.Post(actionURL(client, id), reqBody, nil, nil)
	return res
}