package disk

import (
	"context"
	"encoding/json"

	"github.com/shirou/gopsutil/v3/internal/common"
)

var invoke common.Invoker = common.Invoke{}

type UsageStat struct {
	Path              string  `json:"path"`
	Fstype            string  `json:"fstype"`
	Total             uint64  `json:"total"`
	Free              uint64  `json:"free"`
	Used              uint64  `json:"used"`
	UsedPercent       float64 `json:"usedPercent"`
	InodesTotal       uint64  `json:"inodesTotal"`
	InodesUsed        uint64  `json:"inodesUsed"`
	InodesFree        uint64  `json:"inodesFree"`
	InodesUsedPercent float64 `json:"inodesUsedPercent"`
}

type PartitionStat struct {
	Device     string   `json:"device"`
	Mountpoint string   `json:"mountpoint"`
	Fstype     string   `json:"fstype"`
	Opts       []string `json:"opts"`
}

type IOCountersStat struct {
	ReadCount        uint64 `json:"readCount"`
	MergedReadCount  uint64 `json:"mergedReadCount"`
	WriteCount       uint64 `json:"writeCount"`
	MergedWriteCount uint64 `json:"mergedWriteCount"`
	ReadBytes        uint64 `json:"readBytes"`
	WriteBytes       uint64 `json:"writeBytes"`
	ReadTime         uint64 `json:"readTime"`
	WriteTime        uint64 `json:"writeTime"`
	IopsInProgress   uint64 `json:"iopsInProgress"`
	IoTime           uint64 `json:"ioTime"`
	WeightedIO       uint64 `json:"weightedIO"`
	Name             string `json:"name"`
	SerialNumber     string `json:"serialNumber"`
	Label            string `json:"label"`
}

func (d UsageStat) String() string {
	s, _ := json.Marshal(d)
	return string(s)
}

func (d PartitionStat) String() string {
	s, _ := json.Marshal(d)
	return string(s)
}

func (d IOCountersStat) String() string {
	s, _ := json.Marshal(d)
	return string(s)
}

// Usage returns a file system usage. path is a filesystem path such
// as "/", not device file path like "/dev/vda1".  If you want to use
// a return value of disk.Partitions, use "Mountpoint" not "Device".
func Usage(path string) (*UsageStat, error) {
	return UsageWithContext(context.Background(), path)
}

// Partitions returns disk partitions. If all is false, returns
// physical devices only (e.g. hard disks, cd-rom drives, USB keys)
// and ignore all others (e.g. memory partitions such as /dev/shm)
//
// 'all' argument is ignored for BSD, see: https://github.com/giampaolo/psutil/issues/906
func Partitions(all bool) ([]PartitionStat, error) {
	return PartitionsWithContext(context.Background(), all)
}

func IOCounters(names ...string) (map[string]IOCountersStat, error) {
	return IOCountersWithContext(context.Background(), names...)
}

// SerialNumber returns Serial Number of given device or empty string
// on error. Name of device is expected, eg. /dev/sda
func SerialNumber(name string) (string, error) {
	return SerialNumberWithContext(context.Background(), name)
}

// Label returns label of given device or empty string on error.
// Name of device is expected, eg. /dev/sda
// Supports label based on devicemapper name
// See https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-block-dm
func Label(name string) (string, error) {
	return LabelWithContext(context.Background(), name)
}