package windowsoci

// This file contains the Windows spec for a container. At the time of
// writing, Windows does not have a spec defined in opencontainers/specs,
// hence this is an interim workaround. TODO Windows: FIXME @jhowardmsft

import "fmt"

// WindowsSpec is the full specification for Windows containers.
type WindowsSpec struct {
	Spec

	// Windows is platform specific configuration for Windows based containers.
	Windows Windows `json:"windows"`
}

// Spec is the base configuration for the container.  It specifies platform
// independent configuration. This information must be included when the
// bundle is packaged for distribution.
type Spec struct {

	// Version is the version of the specification that is supported.
	Version string `json:"ociVersion"`
	// Platform is the host information for OS and Arch.
	Platform Platform `json:"platform"`
	// Process is the container's main process.
	Process Process `json:"process"`
	// Root is the root information for the container's filesystem.
	Root Root `json:"root"`
	// Hostname is the container's host name.
	Hostname string `json:"hostname,omitempty"`
	// Mounts profile configuration for adding mounts to the container's filesystem.
	Mounts []Mount `json:"mounts"`
}

// Windows contains platform specific configuration for Windows based containers.
type Windows struct {
	// Resources contain information for handling resource constraints for the container
	Resources *Resources `json:"resources,omitempty"`
	// Networking contains the platform specific network settings for the container.
	Networking *Networking `json:"networking,omitempty"`
	// FirstStart is used for an optimization on first boot of Windows
	FirstStart bool `json:"first_start,omitempty"`
	// LayerFolder is the path to the current layer folder
	LayerFolder string `json:"layer_folder,omitempty"`
	// Layer paths of the parent layers
	LayerPaths []string `json:"layer_paths,omitempty"`
	// HvRuntime contains settings specific to Hyper-V containers, omitted if not using Hyper-V isolation
	HvRuntime *HvRuntime `json:"hv_runtime,omitempty"`
}

// Process contains information to start a specific application inside the container.
type Process struct {
	// Terminal indicates if stderr should NOT be attached for the container.
	Terminal bool `json:"terminal"`
	// ConsoleSize contains the initial h,w of the console size
	InitialConsoleSize [2]int `json:"-"`
	// User specifies user information for the process.
	User User `json:"user"`
	// Args specifies the binary and arguments for the application to execute.
	Args []string `json:"args"`
	// Env populates the process environment for the process.
	Env []string `json:"env,omitempty"`
	// Cwd is the current working directory for the process and must be
	// relative to the container's root.
	Cwd string `json:"cwd"`
}

// User contains the user information for Windows
type User struct {
	User string `json:"user,omitempty"`
}

// Root contains information about the container's root filesystem on the host.
type Root struct {
	// Path is the absolute path to the container's root filesystem.
	Path string `json:"path"`
	// Readonly makes the root filesystem for the container readonly before the process is executed.
	Readonly bool `json:"readonly"`
}

// Platform specifies OS and arch information for the host system that the container
// is created for.
type Platform struct {
	// OS is the operating system.
	OS string `json:"os"`
	// Arch is the architecture
	Arch string `json:"arch"`
}

// Mount specifies a mount for a container.
type Mount struct {
	// Destination is the path where the mount will be placed relative to the container's root.  The path and child directories MUST exist, a runtime MUST NOT create directories automatically to a mount point.
	Destination string `json:"destination"`
	// Type specifies the mount kind.
	Type string `json:"type"`
	// Source specifies the source path of the mount.  In the case of bind mounts
	// this would be the file on the host.
	Source string `json:"source"`
	// Readonly specifies if the mount should be read-only
	Readonly bool `json:"readonly"`
}

// HvRuntime contains settings specific to Hyper-V containers
type HvRuntime struct {
	// ImagePath is the path to the Utility VM image for this container
	ImagePath string `json:"image_path,omitempty"`
}

// Networking contains the platform specific network settings for the container
type Networking struct {
	// List of endpoints to be attached to the container
	EndpointList []string `json:"endpoints,omitempty"`
}

// Storage contains storage resource management settings
type Storage struct {
	// Specifies maximum Iops for the system drive
	Iops *uint64 `json:"iops,omitempty"`
	// Specifies maximum bytes per second for the system drive
	Bps *uint64 `json:"bps,omitempty"`
	// Sandbox size indicates the size to expand the system drive to if it is currently smaller
	SandboxSize *uint64 `json:"sandbox_size,omitempty"`
}

// Memory contains memory settings for the container
type Memory struct {
	// Memory limit (in bytes).
	Limit *int64 `json:"limit,omitempty"`
	// Memory reservation (in bytes).
	Reservation *uint64 `json:"reservation,omitempty"`
}

// CPU contains information for cpu resource management
type CPU struct {
	// Number of CPUs available to the container. This is an appoximation for Windows Server Containers.
	Count *uint64 `json:"count,omitempty"`
	// CPU shares (relative weight (ratio) vs. other containers with cpu shares). Range is from 1 to 10000.
	Shares *uint64 `json:"shares,omitempty"`
	// Percent of available CPUs usable by the container.
	Percent *int64 `json:"percent,omitempty"`
}

// Network network resource management information
type Network struct {
	// Bandwidth is the maximum egress bandwidth in bytes per second
	Bandwidth *uint64 `json:"bandwidth,omitempty"`
}

// Resources has container runtime resource constraints
// TODO Windows containerd. This structure needs ratifying with the old resources
// structure used on Windows and the latest OCI spec.
type Resources struct {
	// Memory restriction configuration
	Memory *Memory `json:"memory,omitempty"`
	// CPU resource restriction configuration
	CPU *CPU `json:"cpu,omitempty"`
	// Storage restriction configuration
	Storage *Storage `json:"storage,omitempty"`
	// Network restriction configuration
	Network *Network `json:"network,omitempty"`
}

const (
	// VersionMajor is for an API incompatible changes
	VersionMajor = 0
	// VersionMinor is for functionality in a backwards-compatible manner
	VersionMinor = 3
	// VersionPatch is for backwards-compatible bug fixes
	VersionPatch = 0

	// VersionDev indicates development branch. Releases will be empty string.
	VersionDev = ""
)

// Version is the specification version that the package types support.
var Version = fmt.Sprintf("%d.%d.%d%s (Windows)", VersionMajor, VersionMinor, VersionPatch, VersionDev)