package cdssdk

import (
	"database/sql/driver"
	"fmt"
	"time"

	"github.com/samber/lo"
	"gitlink.org.cn/cloudream/common/pkgs/types"
	"gitlink.org.cn/cloudream/common/utils/math2"
	"gitlink.org.cn/cloudream/common/utils/serder"
)

const (
	ObjectPathSeparator = "/"
)

type HubID int64

type PackageID int64

type ObjectID int64

type UserID int64

type BucketID int64

type StorageID int64

type LocationID int64

/// TODO 将分散在各处的公共结构体定义集中到这里来

type Redundancy interface {
}

var RedundancyUnion = serder.UseTypeUnionInternallyTagged(types.Ref(types.NewTypeUnion[Redundancy](
	(*NoneRedundancy)(nil),
	(*RepRedundancy)(nil),
	(*ECRedundancy)(nil),
	(*LRCRedundancy)(nil),
	(*SegmentRedundancy)(nil),
	(*MultipartUploadRedundancy)(nil),
)), "type")

type NoneRedundancy struct {
	serder.Metadata `union:"none"`
	Type            string `json:"type"`
}

func NewNoneRedundancy() *NoneRedundancy {
	return &NoneRedundancy{
		Type: "none",
	}
}
func (b *NoneRedundancy) Value() (driver.Value, error) {
	return serder.ObjectToJSONEx[Redundancy](b)
}

var DefaultRepRedundancy = *NewRepRedundancy(2)

type RepRedundancy struct {
	serder.Metadata `union:"rep"`
	Type            string `json:"type"`
	RepCount        int    `json:"repCount"`
}

func NewRepRedundancy(repCount int) *RepRedundancy {
	return &RepRedundancy{
		Type:     "rep",
		RepCount: repCount,
	}
}
func (b *RepRedundancy) Value() (driver.Value, error) {
	return serder.ObjectToJSONEx[Redundancy](b)
}

var DefaultECRedundancy = *NewECRedundancy(2, 3, 1024*1024*5)

type ECRedundancy struct {
	serder.Metadata `union:"ec"`
	Type            string `json:"type"`
	K               int    `json:"k"`
	N               int    `json:"n"`
	ChunkSize       int    `json:"chunkSize"`
}

func NewECRedundancy(k int, n int, chunkSize int) *ECRedundancy {
	return &ECRedundancy{
		Type:      "ec",
		K:         k,
		N:         n,
		ChunkSize: chunkSize,
	}
}
func (b *ECRedundancy) Value() (driver.Value, error) {
	return serder.ObjectToJSONEx[Redundancy](b)
}

func (b *ECRedundancy) StripSize() int64 {
	return int64(b.ChunkSize) * int64(b.K)
}

var DefaultLRCRedundancy = *NewLRCRedundancy(2, 4, []int{2}, 1024*1024*5)

type LRCRedundancy struct {
	serder.Metadata `union:"lrc"`
	Type            string `json:"type"`
	K               int    `json:"k"`
	N               int    `json:"n"`
	Groups          []int  `json:"groups"`
	ChunkSize       int    `json:"chunkSize"`
}

func NewLRCRedundancy(k int, n int, groups []int, chunkSize int) *LRCRedundancy {
	return &LRCRedundancy{
		Type:      "lrc",
		K:         k,
		N:         n,
		Groups:    groups,
		ChunkSize: chunkSize,
	}
}
func (b *LRCRedundancy) Value() (driver.Value, error) {
	return serder.ObjectToJSONEx[Redundancy](b)
}

// 判断指定块属于哪个组。如果都不属于，则返回-1。
func (b *LRCRedundancy) FindGroup(idx int) int {
	if idx >= b.N-len(b.Groups) {
		return idx - (b.N - len(b.Groups))
	}

	for i, group := range b.Groups {
		if idx < group {
			return i
		}
		idx -= group
	}

	return -1
}

// M = N - len(Groups)，即数据块+校验块的总数，不包括组校验块。
func (b *LRCRedundancy) M() int {
	return b.N - len(b.Groups)
}

func (b *LRCRedundancy) GetGroupElements(grp int) []int {
	var idxes []int

	grpStart := 0
	for i := 0; i < grp; i++ {
		grpStart += b.Groups[i]
	}

	for i := 0; i < b.Groups[grp]; i++ {
		idxes = append(idxes, grpStart+i)
	}

	idxes = append(idxes, b.N-len(b.Groups)+grp)
	return idxes
}

type SegmentRedundancy struct {
	serder.Metadata `union:"segment"`
	Type            string  `json:"type"`
	Segments        []int64 `json:"segments"` // 每一段的大小
}

func NewSegmentRedundancy(totalSize int64, segmentCount int) *SegmentRedundancy {
	return &SegmentRedundancy{
		Type:     "segment",
		Segments: math2.SplitN(totalSize, segmentCount),
	}
}

func (r *SegmentRedundancy) SegmentCount() int {
	return len(r.Segments)
}

func (r *SegmentRedundancy) CalcSegmentStart(index int) int64 {
	return lo.Sum(r.Segments[:index])
}

// 计算指定位置取整到最近的段的起始位置。
func (r *SegmentRedundancy) FloorSegmentPosition(pos int64) int64 {
	fpos := int64(0)
	for _, segLen := range r.Segments {
		segEnd := fpos + segLen
		if pos < segEnd {
			break
		}
		fpos += segLen
	}

	return fpos
}

// 计算指定范围内的段索引范围，参数和返回值所代表的范围都是左闭右开的。
// 如果end == -1，则代表计算从start到最后一个字节的范围。
func (b *SegmentRedundancy) CalcSegmentRange(start int64, end *int64) (segIdxStart int, segIdxEnd int) {
	segIdxStart = len(b.Segments)
	segIdxEnd = len(b.Segments)

	// 找到第一个包含start的段索引
	segStart := int64(0)
	for i, segLen := range b.Segments {
		segEnd := segStart + segLen
		if start < segEnd {
			segIdxStart = i
			break
		}
		segStart += segLen
	}

	if end != nil {
		// 找到第一个包含end的段索引
		segStart = int64(0)
		for i, segLen := range b.Segments {
			segEnd := segStart + segLen
			if *end <= segEnd {
				segIdxEnd = i + 1
				break
			}
			segStart += segLen
		}
	}

	return
}

type MultipartUploadRedundancy struct {
	serder.Metadata `union:"multipartUpload"`
	Type            string `json:"type"`
}

func NewMultipartUploadRedundancy() *MultipartUploadRedundancy {
	return &MultipartUploadRedundancy{
		Type: "multipartUpload",
	}
}

type User struct {
	UserID   UserID `gorm:"column:UserID; primaryKey; type:bigint" json:"userID"`
	Name     string `gorm:"column:Name; type:varchar(255); not null" json:"name"`
	Password string `gorm:"column:Password; type:varchar(255); not null" json:"password"`
}

func (User) TableName() string {
	return "User"
}

const (
	PackageStateNormal  = "Normal"
	PackageStateDeleted = "Deleted"
)

type Package struct {
	PackageID  PackageID `gorm:"column:PackageID; primaryKey; type:bigint; autoIncrement" json:"packageID"`
	Name       string    `gorm:"column:Name; type:varchar(255); not null" json:"name"`
	BucketID   BucketID  `gorm:"column:BucketID; type:bigint; not null" json:"bucketID"`
	CreateTime time.Time `gorm:"column:CreateTime; type:datetime; not null" json:"createTime"`
	State      string    `gorm:"column:State; type:varchar(255); not null" json:"state"`
}

func (Package) TableName() string {
	return "Package"
}

type Object struct {
	ObjectID   ObjectID   `json:"objectID"  gorm:"column:ObjectID; primaryKey; type:bigint; autoIncrement" `
	PackageID  PackageID  `json:"packageID" gorm:"column:PackageID; type:bigint; not null"`
	Path       string     `json:"path" gorm:"column:Path; type:varchar(1024); not null"`
	Size       int64      `json:"size,string" gorm:"column:Size; type:bigint; not null"`
	FileHash   FileHash   `json:"fileHash" gorm:"column:FileHash; type:char(68); not null"`
	Redundancy Redundancy `json:"redundancy" gorm:"column:Redundancy; type: json; serializer:union"`
	CreateTime time.Time  `json:"createTime" gorm:"column:CreateTime; type:datetime; not null"`
	UpdateTime time.Time  `json:"updateTime" gorm:"column:UpdateTime; type:datetime; not null"`
}

func (Object) TableName() string {
	return "Object"
}

type Hub struct {
	HubID          HubID          `gorm:"column:HubID; primaryKey; type:bigint; autoIncrement" json:"hubID"`
	Name           string         `gorm:"column:Name; type:varchar(255); not null" json:"name"`
	Address        HubAddressInfo `gorm:"column:Address; type:json; serializer:union" json:"address"`
	LocationID     LocationID     `gorm:"column:LocationID; type:bigint; not null" json:"locationID"`
	State          string         `gorm:"column:State; type:varchar(255); not null" json:"state"`
	LastReportTime *time.Time     `gorm:"column:LastReportTime; type:datetime" json:"lastReportTime"`
}

func (Hub) TableName() string {
	return "Hub"
}

type HubAddressInfo interface {
}

var HubAddressUnion = types.NewTypeUnion[HubAddressInfo](
	(*GRPCAddressInfo)(nil),
	(*HttpAddressInfo)(nil),
)

var _ = serder.UseTypeUnionInternallyTagged(&HubAddressUnion, "type")

type GRPCAddressInfo struct {
	serder.Metadata  `union:"GRPC"`
	Type             string `json:"type"`
	LocalIP          string `json:"localIP"`
	ExternalIP       string `json:"externalIP"`
	LocalGRPCPort    int    `json:"localGRPCPort"`
	ExternalGRPCPort int    `json:"externalGRPCPort"`
}

type HttpAddressInfo struct {
	serder.Metadata `union:"HTTP"`
	Type            string `json:"type"`
	LocalIP         string `json:"localIP"`
	ExternalIP      string `json:"externalIP"`
	Port            int    `json:"port"`
}

func (n Hub) String() string {
	return fmt.Sprintf("%v(%v)", n.Name, n.HubID)
}

type PinnedObject struct {
	ObjectID   ObjectID  `gorm:"column:ObjectID; primaryKey; type:bigint" json:"objectID"`
	StorageID  StorageID `gorm:"column:StorageID; primaryKey; type:bigint" json:"storageID"`
	CreateTime time.Time `gorm:"column:CreateTime; type:datetime; not null" json:"createTime"`
}

func (PinnedObject) TableName() string {
	return "PinnedObject"
}

type Bucket struct {
	BucketID   BucketID  `gorm:"column:BucketID; primaryKey; type:bigint; autoIncrement" json:"bucketID"`
	Name       string    `gorm:"column:Name; type:varchar(255); not null" json:"name"`
	CreateTime time.Time `gorm:"column:CreateTime; type:datetime; not null" json:"createTime"`
	CreatorID  UserID    `gorm:"column:CreatorID; type:bigint; not null" json:"creatorID"`
}

func (Bucket) TableName() string {
	return "Bucket"
}

type HubConnectivity struct {
	FromHubID HubID     `gorm:"column:FromHubID; primaryKey; type:bigint" json:"fromHubID"`
	ToHubID   HubID     `gorm:"column:ToHubID; primaryKey; type:bigint" json:"ToHubID"`
	Latency   *float32  `gorm:"column:Latency; type:float" json:"latency"`
	TestTime  time.Time `gorm:"column:TestTime; type:datetime" json:"testTime"`
}

func (HubConnectivity) TableName() string {
	return "HubConnectivity"
}

type StoragePackageCachingInfo struct {
	StorageID   StorageID `json:"storageID"`
	FileSize    int64     `json:"fileSize"`
	ObjectCount int64     `json:"objectCount"`
}

type PackageCachingInfo struct {
	StorageInfos []StoragePackageCachingInfo `json:"stgInfos"`
	PackageSize  int64                       `json:"packageSize"`
}

func NewPackageCachingInfo(stgInfos []StoragePackageCachingInfo, packageSize int64) PackageCachingInfo {
	return PackageCachingInfo{
		StorageInfos: stgInfos,
		PackageSize:  packageSize,
	}
}

type CodeError struct {
	Code    string `json:"code"`
	Message string `json:"message"`
}

func (e *CodeError) Error() string {
	return fmt.Sprintf("code: %s, message: %s", e.Code, e.Message)
}

type PackageHash struct {
	// 16进制字符串格式的sha256哈希值
	Hash string `json:"hash"`
}

type UserStats struct {
	UserID    UserID `json:"userID" gorm:"column:UserID"`
	FileCount int64  `json:"fileCount" gorm:"column:FileCount"`
	TotalSize int64  `json:"totalSize" gorm:"column:TotalSize"`
}

type UserInfo struct {
	Name   string `json:"name"`
	UserID UserID `json:"userID"`
	SsoID  string `json:"ssoID"`
}