package protocol

import (
	"path"
	"strings"
)

const (
	SharedSpace  = "shared"
	branchPrefix = "branch:"
	MaxBlobSize  = 5 << 20
)

type File struct {
	Hash string `json:"hash"`
	Time int64  `json:"time"`
}

type Manifest map[string]File

type State struct {
	Seq    int64               `json:"seq"`
	Spaces map[string]Manifest `json:"spaces"`
}

type Change struct {
	Space string `json:"space"`
	Path  string `json:"path"`
	Base  string `json:"base"`
	Hash  string `json:"hash"`
}

type Push struct {
	Name       string   `json:"name"`
	Author     string   `json:"author,omitempty"`
	MainSHA    string   `json:"main_sha"`
	MainBranch string   `json:"main_branch"`
	Changes    []Change `json:"changes"`
}

type Revision struct {
	Seq        int64    `json:"seq"`
	Machine    string   `json:"machine"`
	Author     string   `json:"author"`
	Time       int64    `json:"time"`
	MainSHA    string   `json:"main_sha"`
	MainBranch string   `json:"main_branch"`
	Changes    []Change `json:"changes"`
}

type Repo struct {
	Key  string `json:"key"`
	Name string `json:"name"`
	Seq  int64  `json:"seq"`
	Time int64  `json:"time"`
}

type Machine struct {
	ID        int64  `json:"id"`
	Name      string `json:"name"`
	CreatedAt int64  `json:"created_at"`
	LastPush  int64  `json:"last_push"`
	LastSeen  int64  `json:"last_seen"`
	Online    bool   `json:"online"`
	Revisions int64  `json:"revisions"`
}

type Login struct {
	Password string `json:"password"`
}

type Event struct {
	Repo   string `json:"repo"`
	Seq    int64  `json:"seq"`
	Author string `json:"author,omitempty"`
}

type ClaimRequest struct {
	Code string `json:"code"`
	Name string `json:"name"`
}

type ClaimResponse struct {
	Token string `json:"token"`
}

type CodeResponse struct {
	Code          string `json:"code"`
	Command       string `json:"command"`
	RemoteCommand string `json:"remote_command"`
	ExpiresAt     int64  `json:"expires_at"`
}

func BranchSpace(branch string) string {
	return branchPrefix + branch
}

func ValidSpace(space string) bool {
	return space == SharedSpace || len(space) > len(branchPrefix) && strings.HasPrefix(space, branchPrefix)
}

func SafePath(p string) bool {
	if p == "" || path.IsAbs(p) || path.Clean(p) != p || strings.ContainsAny(p, "\\\x00") {
		return false
	}
	first, _, _ := strings.Cut(p, "/")
	return first != ".." && first != "." && !strings.EqualFold(first, ".git")
}