// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package v2

import (
	"time"

	// TODO(rjnagal): Remove dependency after moving all stats structs from v1.
	// using v1 now for easy conversion.
	"github.com/google/cadvisor/info/v1"
)

const (
	TypeName   = "name"
	TypeDocker = "docker"
)

type CpuSpec struct {
	// Requested cpu shares. Default is 1024.
	Limit uint64 `json:"limit"`
	// Requested cpu hard limit. Default is unlimited (0).
	// Units: milli-cpus.
	MaxLimit uint64 `json:"max_limit"`
	// Cpu affinity mask.
	// TODO(rjnagal): Add a library to convert mask string to set of cpu bitmask.
	Mask string `json:"mask,omitempty"`
}

type MemorySpec struct {
	// The amount of memory requested. Default is unlimited (-1).
	// Units: bytes.
	Limit uint64 `json:"limit,omitempty"`

	// The amount of guaranteed memory.  Default is 0.
	// Units: bytes.
	Reservation uint64 `json:"reservation,omitempty"`

	// The amount of swap space requested. Default is unlimited (-1).
	// Units: bytes.
	SwapLimit uint64 `json:"swap_limit,omitempty"`
}

type ContainerSpec struct {
	// Time at which the container was created.
	CreationTime time.Time `json:"creation_time,omitempty"`

	// Other names by which the container is known within a certain namespace.
	// This is unique within that namespace.
	Aliases []string `json:"aliases,omitempty"`

	// Namespace under which the aliases of a container are unique.
	// An example of a namespace is "docker" for Docker containers.
	Namespace string `json:"namespace,omitempty"`

	HasCpu bool    `json:"has_cpu"`
	Cpu    CpuSpec `json:"cpu,omitempty"`

	HasMemory bool       `json:"has_memory"`
	Memory    MemorySpec `json:"memory,omitempty"`
}

type ContainerStats struct {
	// The time of this stat point.
	Timestamp time.Time `json:"timestamp"`
	// CPU statistics
	HasCpu bool        `json:"has_cpu"`
	Cpu    v1.CpuStats `json:"cpu,omitempty"`
	// Disk IO statistics
	HasDiskIo bool           `json:"has_diskio"`
	DiskIo    v1.DiskIoStats `json:"diskio,omitempty"`
	// Memory statistics
	HasMemory bool           `json:"has_memory"`
	Memory    v1.MemoryStats `json:"memory,omitempty"`
	// Network statistics
	HasNetwork bool              `json:"has_network"`
	Network    []v1.NetworkStats `json:"network,omitempty"`
	// Filesystem statistics
	HasFilesystem bool         `json:"has_filesystem"`
	Filesystem    []v1.FsStats `json:"filesystem,omitempty"`
	// Task load statistics
	HasLoad bool         `json:"has_load"`
	Load    v1.LoadStats `json:"load_stats,omitempty"`
}

type Percentiles struct {
	// Indicates whether the stats are present or not.
	// If true, values below do not have any data.
	Present bool `json:"present"`
	// Average over the collected sample.
	Mean uint64 `json:"mean"`
	// Max seen over the collected sample.
	Max uint64 `json:"max"`
	// 90th percentile over the collected sample.
	Ninety uint64 `json:"ninety"`
}

type Usage struct {
	// Indicates amount of data available [0-100].
	// If we have data for half a day, we'll still process DayUsage,
	// but set PercentComplete to 50.
	PercentComplete int32 `json:"percent_complete"`
	// Mean, Max, and 90p cpu rate value in milliCpus/seconds. Converted to milliCpus to avoid floats.
	Cpu Percentiles `json:"cpu"`
	// Mean, Max, and 90p memory size in bytes.
	Memory Percentiles `json:"memory"`
}

// latest sample collected for a container.
type InstantUsage struct {
	// cpu rate in cpu milliseconds/second.
	Cpu uint64 `json:"cpu"`
	// Memory usage in bytes.
	Memory uint64 `json:"memory"`
}

type DerivedStats struct {
	// Time of generation of these stats.
	Timestamp time.Time `json:"timestamp"`
	// Latest instantaneous sample.
	LatestUsage InstantUsage `json:"latest_usage"`
	// Percentiles in last observed minute.
	MinuteUsage Usage `json:"minute_usage"`
	// Percentile in last hour.
	HourUsage Usage `json:"hour_usage"`
	// Percentile in last day.
	DayUsage Usage `json:"day_usage"`
}

type FsInfo struct {
	// The block device name associated with the filesystem.
	Device string `json:"device"`

	// Path where the filesystem is mounted.
	Mountpoint string `json:"mountpoint"`

	// Filesystem usage in bytes.
	Capacity uint64 `json:"capacity"`

	// Number of bytes used on this filesystem.
	Usage uint64 `json:"usage"`

	// Labels associated with this filesystem.
	Labels []string `json:"labels"`
}

type RequestOptions struct {
	// Type of container identifier specified - "name", "dockerid", dockeralias"
	IdType string `json:"type"`
	// Number of stats to return
	Count int `json:"count"`
	// Whether to include stats for child subcontainers.
	Recursive bool `json:"recursive"`
}
