browser/platform/service/server_files.go

package service

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"path"
	"sort"
	"strconv"
	"strings"
	"time"

	"browser.local/platform/domain"
	"browser.local/platform/repo"
	"browser.local/platform/validator"
)

const (
	serverFileTransferChannel     = "run-file-transfer"
	serverFileMaxInlineEditBytes  = 64 * 1024
	serverFileDefaultDirectoryKey = "server-root"
	serverFileBrowseWait          = 4 * time.Second
)

type serverFileContext struct {
	User      domain.User
	Instance  domain.ServerInstance
	Plugin    domain.GamePlugin
	Directory domain.PluginLogicalDirectory
	Workspace domain.PluginFileWorkspace
	Scope     string
}

type runFileListEnvelope struct {
	DirectoryKey string             `json:"directoryKey"`
	Path         string             `json:"path"`
	Entries      []runFileListEntry `json:"entries"`
}

type runFileListEntry struct {
	Name         string `json:"name"`
	Kind         string `json:"kind"`
	DirectoryKey string `json:"directoryKey"`
	RelativePath string `json:"relativePath"`
	LogicalKey   string `json:"logicalKey"`
	Scope        string `json:"scope"`
	SizeBytes    int64  `json:"sizeBytes"`
	ModifiedAt   string `json:"modifiedAt"`
	Checksum     string `json:"checksum"`
	Editable     bool   `json:"editable"`
	Downloadable bool   `json:"downloadable"`
	Remark       string `json:"remark"`
}

func (svc *CoreService) GetServerFileWorkspaceForSession(sessionID string, serverInstanceID string) (domain.ServerFileWorkspaceView, error) {
	ctx, err := svc.serverFileContextForSession(sessionID, serverInstanceID, "", false)
	if err != nil {
		return domain.ServerFileWorkspaceView{}, err
	}
	workspace := domain.CopyPluginFileWorkspace(ctx.Workspace)
	view := domain.ServerFileWorkspaceView{
		ServerInstanceID:      ctx.Instance.ID,
		PluginID:              ctx.Plugin.ID,
		DefaultDirectoryKey:   workspace.DefaultDirectoryKey,
		Directories:           workspace.Directories,
		Files:                 workspace.Files,
		ConfigFields:          workspace.ConfigFields,
		DeclaredOnly:          false,
		RuntimeWorkspaceScope: svc.runtimeProfileScope(ctx.Instance.ID),
		Transfer: domain.ServerFileTransferPolicy{
			Channel:                serverFileTransferChannel,
			UploadChunkSizeBytes:   validator.MaxArtifactChunkBytes,
			DownloadChunkSizeBytes: validator.MaxArtifactDownloadBytes,
			MaxInlineEditBytes:     serverFileMaxInlineEditBytes,
			MaxBrowserUploadBytes:  validator.MaxArtifactBytes,
			Notes: []string{
				"文件字节通过独立文件传输端点传递，不占用 control、jobs 或 logs 通道。",
				"Web 只发送逻辑目录和相对路径；Run 在本机工作区内解析真实路径。",
			},
		},
	}
	return domain.CopyServerFileWorkspaceView(view), nil
}

func (svc *CoreService) ListServerFilesForSession(sessionID string, request domain.ServerFileListRequest) (domain.ServerFileListResult, error) {
	request = normalizeServerFileListRequest(request)
	if err := validator.ValidateServerFileListRequest(request); err != nil {
		return domain.ServerFileListResult{}, err
	}
	ctx, err := svc.serverFileContextForSession(sessionID, request.ServerInstanceID, request.DirectoryKey, false)
	if err != nil {
		return domain.ServerFileListResult{}, err
	}
	latest, hasLatest, err := svc.latestFileListJob(ctx.Instance.ID, request.DirectoryKey, request.Path)
	if err != nil {
		return domain.ServerFileListResult{}, err
	}
	if hasLatest && latest.State == domain.JobStateSucceeded && latest.ExecutionResult.Kind == "file.list" {
		entries, parseErr := serverFileEntriesFromRunList(latest.ExecutionResult.Content, request.DirectoryKey, request.Path)
		if parseErr == nil {
			return domain.CopyServerFileListResult(domain.ServerFileListResult{ServerInstanceID: ctx.Instance.ID, PluginID: ctx.Plugin.ID, DirectoryKey: request.DirectoryKey, Path: request.Path, State: "ready", Entries: filterServerFileEntries(entries, request.Query), Job: latest, RefreshedAt: latest.TerminalAt}), nil
		}
		entries = filterServerFileEntries(serverFileEntriesFromDeclaredWorkspace(ctx.Workspace, request.DirectoryKey), request.Query)
		return domain.CopyServerFileListResult(domain.ServerFileListResult{ServerInstanceID: ctx.Instance.ID, PluginID: ctx.Plugin.ID, DirectoryKey: request.DirectoryKey, Path: request.Path, State: "failed", Entries: entries, Job: latest, RefreshedAt: latest.TerminalAt, Reason: "Run 返回的文件列表无法解析。"}), nil
	}
	state := "declared"
	reason := "展示服务器文件缓存；打开文件标签时会自动读取 Run 实时目录。"
	if hasLatest {
		if !isTerminalJobState(latest.State) {
			state = "pending"
			reason = "Run 正在刷新目录。"
		} else if latest.State == domain.JobStateFailed || latest.State == domain.JobStateCancelled {
			state = "failed"
			reason = serverFileListJobFailureReason(latest)
		}
	}
	entries := filterServerFileEntries(serverFileEntriesFromDeclaredWorkspace(ctx.Workspace, request.DirectoryKey), request.Query)
	if state == "declared" {
		reason = "展示服务器文件缓存；打开文件标签时会自动读取 Run 实时目录。"
	}
	return domain.CopyServerFileListResult(domain.ServerFileListResult{ServerInstanceID: ctx.Instance.ID, PluginID: ctx.Plugin.ID, DirectoryKey: request.DirectoryKey, Path: request.Path, State: state, Entries: entries, Job: latest, RefreshedAt: latest.TerminalAt, Reason: reason}), nil
}

func serverFileListJobFailureReason(job domain.Job) string {
	prefix := "Run 文件目录刷新失败"
	if job.State == domain.JobStateCancelled {
		prefix = "Run 文件目录刷新已取消"
	}
	detail := strings.TrimSpace(job.CancelReason)
	if detail == "" {
		detail = strings.TrimSpace(job.Progress.Message)
	}
	if detail == "" {
		detail = strings.TrimSpace(job.ExecutionResult.Summary)
	}
	if detail == "" {
		return prefix + "。"
	}
	return prefix + "：" + detail
}

func (svc *CoreService) RefreshServerFileListForSession(sessionID string, request domain.ServerFileListRequest) (domain.ServerFileListResult, error) {
	request = normalizeServerFileListRequest(request)
	if request.IdempotencyKey == "" {
		request.IdempotencyKey = fmt.Sprintf("file-list:%s:%s:%s", request.ServerInstanceID, request.DirectoryKey, request.Path)
	}
	if err := validator.ValidateServerFileListRequest(request); err != nil {
		return domain.ServerFileListResult{}, err
	}
	ctx, err := svc.serverFileContextForSession(sessionID, request.ServerInstanceID, request.DirectoryKey, false)
	if err != nil {
		return domain.ServerFileListResult{}, err
	}
	endpoint, err := svc.GetRunEndpoint(ctx.Instance.RunEndpointID)
	if err != nil {
		return domain.ServerFileListResult{}, err
	}
	entries := filterServerFileEntries(serverFileEntriesFromDeclaredWorkspace(ctx.Workspace, request.DirectoryKey), request.Query)
	if !containsString(endpoint.Capabilities, domain.JobCapabilityFilesList) {
		return domain.CopyServerFileListResult(domain.ServerFileListResult{
			ServerInstanceID: ctx.Instance.ID,
			PluginID:         ctx.Plugin.ID,
			DirectoryKey:     request.DirectoryKey,
			Path:             request.Path,
			State:            "ready",
			Entries:          entries,
			Reason:           "当前 Run 未声明 files.list，已展示插件声明的逻辑文件。",
		}), nil
	}
	job, err := svc.CreateJob(domain.Job{
		ID:               jobIDFromParts("job-file-list", request.ServerInstanceID, request.IdempotencyKey),
		ServerInstanceID: ctx.Instance.ID,
		RunEndpointID:    ctx.Instance.RunEndpointID,
		Capability:       domain.JobCapabilityFilesList,
		TargetKey:        request.DirectoryKey,
		InputRef:         "",
		ExecutionInput: domain.JobExecutionInput{WorkspaceScope: svc.runtimeProfileScope(ctx.Instance.ID), Deployment: deploymentPlanForDispatch(ctx.Instance.Deployment), Inputs: map[string]string{
			"directoryKey": request.DirectoryKey,
			"path":         request.Path,
			"recursive":    strconv.FormatBool(request.Recursive),
			"query":        request.Query,
		}, MaxReadBytes: serverFileMaxInlineEditBytes},
		IdempotencyKey: request.IdempotencyKey,
		Progress:       domain.JobProgress{Percent: 0, Phase: "queued", Message: "file list queued"},
	})
	if err != nil {
		return domain.ServerFileListResult{}, err
	}
	return domain.CopyServerFileListResult(domain.ServerFileListResult{ServerInstanceID: ctx.Instance.ID, PluginID: ctx.Plugin.ID, DirectoryKey: request.DirectoryKey, Path: request.Path, State: "pending", Entries: entries, Job: job, Reason: "目录刷新任务已派发到 Run。"}), nil
}

func (svc *CoreService) BrowseServerFilesForSession(ctx context.Context, sessionID string, request domain.ServerFileListRequest) (domain.ServerFileListResult, error) {
	request = normalizeServerFileListRequest(request)
	if request.IdempotencyKey == "" {
		idempotencyKey, err := svc.serverFileBrowseIdempotencyKey(request)
		if err != nil {
			return domain.ServerFileListResult{}, err
		}
		request.IdempotencyKey = idempotencyKey
	}
	result, err := svc.RefreshServerFileListForSession(sessionID, request)
	if err != nil || result.State != "pending" || result.Job.ID == "" {
		return result, err
	}
	timer := time.NewTimer(serverFileBrowseWait)
	defer timer.Stop()
	for {
		current, ready, err := svc.serverFileListResultFromJob(request, result, result.Job.ID)
		if err != nil || ready {
			return current, err
		}
		waiter := svc.registerRunJobWaiter(result.Job.RunEndpointID)
		current, ready, err = svc.serverFileListResultFromJob(request, result, result.Job.ID)
		if err != nil || ready {
			svc.unregisterRunJobWaiter(result.Job.RunEndpointID, waiter)
			return current, err
		}
		select {
		case <-ctx.Done():
			svc.unregisterRunJobWaiter(result.Job.RunEndpointID, waiter)
			return domain.ServerFileListResult{}, ctx.Err()
		case <-waiter:
		case <-timer.C:
			svc.unregisterRunJobWaiter(result.Job.RunEndpointID, waiter)
			current.Reason = "正在读取目录。"
			return current, nil
		}
	}
}

func (svc *CoreService) serverFileListResultFromJob(request domain.ServerFileListRequest, fallback domain.ServerFileListResult, jobID string) (domain.ServerFileListResult, bool, error) {
	job, err := svc.store.Jobs().Get(jobID)
	if err != nil {
		return domain.ServerFileListResult{}, true, err
	}
	result := domain.CopyServerFileListResult(fallback)
	result.Job = job
	if !isTerminalJobState(job.State) {
		return result, false, nil
	}
	result.RefreshedAt = job.TerminalAt
	if job.State != domain.JobStateSucceeded || job.ExecutionResult.Kind != "file.list" {
		result.State = "failed"
		result.Reason = serverFileListJobFailureReason(job)
		return result, true, nil
	}
	entries, err := serverFileEntriesFromRunList(job.ExecutionResult.Content, request.DirectoryKey, request.Path)
	if err != nil {
		result.State = "failed"
		result.Reason = "Run 返回的文件列表无法解析。"
		return result, true, nil
	}
	result.State = "ready"
	result.Entries = filterServerFileEntries(entries, request.Query)
	result.Reason = "目录读取完成。"
	return result, true, nil
}

func (svc *CoreService) serverFileBrowseIdempotencyKey(request domain.ServerFileListRequest) (string, error) {
	token, err := randomToken()
	if err != nil {
		return "", err
	}
	raw := strings.Join([]string{request.ServerInstanceID, request.DirectoryKey, request.Path, request.Query, strconv.FormatBool(request.Recursive), token}, ":")
	return fmt.Sprintf("file-browse:%d", stableStringNumber(raw)), nil
}

func (svc *CoreService) ReadServerFileForSession(sessionID string, request domain.ServerFileReadRequest) (domain.FileOperationDispatchResult, error) {
	if err := validator.ValidateServerFileReadRequest(request); err != nil {
		return domain.FileOperationDispatchResult{}, err
	}
	return svc.DispatchFileOperationForSession(sessionID, domain.FileOperationDispatchRequest{ServerInstanceID: request.ServerInstanceID, PluginID: request.PluginID, Operation: domain.FileOperationRead, Key: request.Key, IdempotencyKey: request.IdempotencyKey})
}

func (svc *CoreService) WriteServerFileForSession(sessionID string, request domain.ServerFileWriteRequest) (domain.FileOperationDispatchResult, error) {
	if request.InputRef == "" {
		request.InputRef = fileManagerInlineInputRef(request.ServerInstanceID, request.Key, request.IdempotencyKey)
	}
	if err := validator.ValidateServerFileWriteRequest(request); err != nil {
		return domain.FileOperationDispatchResult{}, err
	}
	return svc.DispatchFileOperationForSession(sessionID, domain.FileOperationDispatchRequest{ServerInstanceID: request.ServerInstanceID, PluginID: request.PluginID, Operation: domain.FileOperationWrite, Key: request.Key, InputRef: request.InputRef, Content: request.Content, ExpectedConfigVersion: request.ExpectedVersion, ExpectedChecksum: request.ExpectedChecksum, IdempotencyKey: request.IdempotencyKey})
}

func (svc *CoreService) UploadServerFileForSession(sessionID string, request domain.ServerFileUploadRequest) (domain.ServerFileUploadDispatch, error) {
	request = domain.CopyServerFileUploadRequest(request)
	if err := validator.ValidateServerFileUploadRequest(request); err != nil {
		return domain.ServerFileUploadDispatch{}, err
	}
	ctx, err := svc.serverFileContextForSession(sessionID, request.ServerInstanceID, request.DirectoryKey, true)
	if err != nil {
		return domain.ServerFileUploadDispatch{}, err
	}
	relativePath := cleanServerFileRelativePath(path.Join(request.RelativePath, request.Filename))
	artifactID := serverFileUploadArtifactID(request.ServerInstanceID, request.IdempotencyKey, relativePath)
	artifact := domain.Artifact{ID: artifactID, OwnerKind: domain.ArtifactOwnerKindServerInstance, OwnerID: ctx.Instance.ID, SizeBytes: int64(len(request.Payload)), Checksum: request.Checksum, State: domain.ArtifactStateAvailable, CreatedAt: svc.now(), UpdatedAt: svc.now()}
	if err := svc.putBrowserFileArtifact(artifact, request.Payload); err != nil {
		return domain.ServerFileUploadDispatch{}, err
	}
	inputRef := "artifact://" + artifact.ID
	targetKey := cleanServerFileRelativePath(path.Join(request.DirectoryKey, relativePath))
	job, err := svc.CreateJob(domain.Job{
		ID:               jobIDFromParts("job-file-upload", request.ServerInstanceID, request.IdempotencyKey),
		ServerInstanceID: ctx.Instance.ID,
		RunEndpointID:    ctx.Instance.RunEndpointID,
		Capability:       domain.JobCapabilityFilesWrite,
		TargetKey:        targetKey,
		InputRef:         inputRef,
		ExecutionInput: domain.JobExecutionInput{WorkspaceScope: svc.runtimeProfileScope(ctx.Instance.ID), Deployment: deploymentPlanForDispatch(ctx.Instance.Deployment), ExpectedChecksum: request.Checksum, Inputs: map[string]string{
			"directoryKey": request.DirectoryKey,
			"relativePath": relativePath,
			"filename":     request.Filename,
			"transfer":     serverFileTransferChannel,
		}},
		IdempotencyKey: request.IdempotencyKey,
		Progress:       domain.JobProgress{Percent: 0, Phase: "queued", Message: "file upload staged; Run will pull input chunks"},
	})
	if err != nil {
		return domain.ServerFileUploadDispatch{}, err
	}
	return domain.CopyServerFileUploadDispatch(domain.ServerFileUploadDispatch{Status: "queued", ServerInstanceID: ctx.Instance.ID, DirectoryKey: request.DirectoryKey, RelativePath: relativePath, ArtifactID: artifact.ID, InputRef: inputRef, SizeBytes: artifact.SizeBytes, Checksum: artifact.Checksum, Job: job}), nil
}

func (svc *CoreService) PrepareServerFileDownloadForSession(sessionID string, request domain.ServerFileDownloadRequest) (domain.ServerFileDownloadResult, error) {
	if err := validator.ValidateServerFileDownloadRequest(request); err != nil {
		return domain.ServerFileDownloadResult{}, err
	}
	ctx, err := svc.serverFileContextForSession(sessionID, request.ServerInstanceID, "", false)
	if err != nil {
		return domain.ServerFileDownloadResult{}, err
	}
	filename := serverFileDisplayName(ctx.Workspace, request.Key)
	job, hasJob, err := svc.latestFileReadJob(ctx.Instance.ID, request.Key)
	if err != nil {
		return domain.ServerFileDownloadResult{}, err
	}
	if hasJob && job.State == domain.JobStateSucceeded && job.ExecutionResult.Kind == "file.read" {
		if strings.HasPrefix(job.ResultRef, "artifact://") {
			reference, openErr := svc.OpenArtifactDownloadForSession(sessionID, domain.ArtifactDownloadReferenceRequest{ArtifactID: strings.TrimPrefix(job.ResultRef, "artifact://")})
			if openErr != nil {
				return domain.ServerFileDownloadResult{}, openErr
			}
			return domain.CopyServerFileDownloadResult(domain.ServerFileDownloadResult{Status: "ready", ServerInstanceID: ctx.Instance.ID, Key: request.Key, Filename: filename, ContentType: reference.ContentType, Checksum: reference.Checksum, SizeBytes: reference.SizeBytes, Artifact: &reference, Job: job, ReadAt: job.TerminalAt}), nil
		}
		if job.ExecutionResult.Content != "" {
			content := redactDeclaredFileReadContent(job.ExecutionResult.Content)
			return domain.CopyServerFileDownloadResult(domain.ServerFileDownloadResult{Status: "ready", ServerInstanceID: ctx.Instance.ID, Key: request.Key, Filename: filename, ContentType: "text/plain; charset=utf-8", Content: content, Checksum: job.ExecutionResult.Checksum, SizeBytes: int64(len([]byte(content))), Job: job, ReadAt: job.TerminalAt}), nil
		}
	}
	if hasJob && !isTerminalJobState(job.State) {
		return domain.CopyServerFileDownloadResult(domain.ServerFileDownloadResult{Status: "pending", ServerInstanceID: ctx.Instance.ID, Key: request.Key, Filename: filename, Job: job, Reason: "文件读取任务仍在执行。"}), nil
	}
	dispatch, err := svc.ReadServerFileForSession(sessionID, domain.ServerFileReadRequest{ServerInstanceID: request.ServerInstanceID, PluginID: ctx.Plugin.ID, Key: request.Key, IdempotencyKey: request.IdempotencyKey})
	if err != nil {
		return domain.ServerFileDownloadResult{}, err
	}
	return domain.CopyServerFileDownloadResult(domain.ServerFileDownloadResult{Status: "pending", ServerInstanceID: ctx.Instance.ID, Key: request.Key, Filename: filename, Job: dispatch.Job, Reason: "文件读取任务已派发；完成后可再次下载。"}), nil
}

func (svc *CoreService) ReadRunFileInputChunk(request domain.RunFileInputChunkRequest) (domain.RunFileInputChunk, error) {
	request = domain.CopyRunFileInputChunkRequest(request)
	if err := validator.ValidateRunFileInputChunkRequest(request); err != nil {
		return domain.RunFileInputChunk{}, err
	}
	session, err := svc.validatedRunSession(request.RunEndpointID, request.SessionToken)
	if err != nil {
		return domain.RunFileInputChunk{}, err
	}
	svc.jobMu.Lock()
	job, err := svc.fencedJob(session, request.JobID, request.LeaseToken, request.Attempt)
	if err != nil {
		svc.jobMu.Unlock()
		return domain.RunFileInputChunk{}, err
	}
	if job.Capability != domain.JobCapabilityFilesWrite || !strings.HasPrefix(job.InputRef, "artifact://") {
		svc.jobMu.Unlock()
		return domain.RunFileInputChunk{}, validationError("job does not reference a file input artifact")
	}
	if job.State != domain.JobStateAccepted && job.State != domain.JobStateRunning {
		svc.jobMu.Unlock()
		return domain.RunFileInputChunk{}, validationError("job is not active")
	}
	artifactID := strings.TrimPrefix(job.InputRef, "artifact://")
	serverInstanceID := job.ServerInstanceID
	svc.jobMu.Unlock()

	artifact, err := svc.store.Artifacts().Get(artifactID)
	if err != nil {
		return domain.RunFileInputChunk{}, err
	}
	if artifact.OwnerKind != domain.ArtifactOwnerKindServerInstance || artifact.OwnerID != serverInstanceID || artifact.State != domain.ArtifactStateAvailable {
		return domain.RunFileInputChunk{}, ErrForbidden
	}
	payload, err := svc.artifactPayload(artifact.ID)
	if err != nil {
		return domain.RunFileInputChunk{}, err
	}
	if int64(len(payload)) != artifact.SizeBytes || validator.BytesChecksum(payload) != artifact.Checksum {
		return domain.RunFileInputChunk{}, validationError("file input artifact checksum mismatch")
	}
	if request.Offset >= artifact.SizeBytes {
		return domain.RunFileInputChunk{}, validationError("offset must be inside artifact content")
	}
	length := request.Length
	remaining := artifact.SizeBytes - request.Offset
	if int64(length) > remaining {
		length = int(remaining)
	}
	end := int(request.Offset) + length
	chunk := domain.RunFileInputChunk{JobID: job.ID, ArtifactID: artifact.ID, Offset: request.Offset, TotalBytes: artifact.SizeBytes, Checksum: artifact.Checksum, Payload: payload[int(request.Offset):end], Complete: int64(end) == artifact.SizeBytes}
	return domain.CopyRunFileInputChunk(chunk), nil
}

func (svc *CoreService) serverFileContextForSession(sessionID string, serverInstanceID string, directoryKey string, requireWrite bool) (serverFileContext, error) {
	instance, err := svc.GetServerInstanceForSession(sessionID, serverInstanceID)
	if err != nil {
		return serverFileContext{}, err
	}
	user, err := svc.GetCurrentUser(sessionID)
	if err != nil {
		return serverFileContext{}, err
	}
	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)
	if err != nil {
		return serverFileContext{}, err
	}
	if plugin.Status != domain.GamePluginStatusInstalled {
		return serverFileContext{}, validationError("plugin must be installed")
	}
	if requireWrite {
		if !containsString(plugin.DeclaredPermissions, "server.files.write") {
			return serverFileContext{}, ErrForbidden
		}
	} else if !plugin.Permissions.Files && !containsString(plugin.DeclaredPermissions, "server.files.read") {
		return serverFileContext{}, ErrForbidden
	}
	workspace := effectiveServerFileWorkspace(plugin)
	directory := domain.PluginLogicalDirectory{}
	if directoryKey != "" {
		var found bool
		for _, candidate := range workspace.Directories {
			if candidate.Key == directoryKey {
				directory = candidate
				found = true
				break
			}
		}
		if !found && len(workspace.Directories) > 0 {
			return serverFileContext{}, validationError("directoryKey must reference an available logical directory")
		}
	}
	return serverFileContext{User: user, Instance: instance, Plugin: plugin, Directory: directory, Workspace: workspace, Scope: svc.runtimeProfileScope(instance.ID)}, nil
}

func effectiveServerFileWorkspace(plugin domain.GamePlugin) domain.PluginFileWorkspace {
	workspace := domain.CopyPluginFileWorkspace(plugin.FileWorkspace)
	if serverFileWorkspaceIsPluginDeclared(workspace) {
		if workspace.DefaultDirectoryKey == "" && len(workspace.Directories) > 0 {
			workspace.DefaultDirectoryKey = workspace.Directories[0].Key
		}
		return workspace
	}
	return domain.PluginFileWorkspace{DefaultDirectoryKey: serverFileDefaultDirectoryKey, Directories: []domain.PluginLogicalDirectory{{Key: serverFileDefaultDirectoryKey, Label: "服务器根目录", Scope: "config"}}, Files: []domain.PluginLogicalFile{}, ConfigFields: []domain.PluginConfigField{}}
}

func serverFileWorkspaceIsPluginDeclared(workspace domain.PluginFileWorkspace) bool {
	return workspace.DefaultDirectoryKey != "" || len(workspace.Directories) > 0 || len(workspace.Files) > 0 || len(workspace.ConfigFields) > 0
}

func normalizeServerFileListRequest(request domain.ServerFileListRequest) domain.ServerFileListRequest {
	request.DirectoryKey = strings.TrimSpace(request.DirectoryKey)
	request.Path = cleanServerFileRelativePath(request.Path)
	request.Query = strings.TrimSpace(request.Query)
	return request
}

func serverFileEntriesFromDeclaredWorkspace(workspace domain.PluginFileWorkspace, directoryKey string) []domain.ServerFileEntry {
	entries := make([]domain.ServerFileEntry, 0)
	for _, directory := range workspace.Directories {
		if directoryKey == "" || directory.Key == directoryKey {
			continue
		}
		entries = append(entries, domain.ServerFileEntry{Name: directory.Label, Kind: domain.ServerFileEntryDirectory, DirectoryKey: directory.Key, RelativePath: "", Scope: directory.Scope, Editable: true, Downloadable: true, Remark: "目录"})
	}
	for _, file := range workspace.Files {
		if directoryKey != "" && file.DirectoryKey != directoryKey {
			continue
		}
		entries = append(entries, domain.ServerFileEntry{Name: file.Label, Kind: domain.ServerFileEntryFile, DirectoryKey: file.DirectoryKey, RelativePath: file.Key, LogicalKey: file.Key, Scope: file.Kind, Editable: true, Downloadable: true, Remark: fileRemark(file)})
	}
	sort.SliceStable(entries, func(i int, j int) bool {
		if entries[i].Kind == entries[j].Kind {
			return strings.ToLower(entries[i].Name) < strings.ToLower(entries[j].Name)
		}
		return entries[i].Kind == domain.ServerFileEntryDirectory
	})
	return entries
}

func serverFileEntriesFromRunList(content string, fallbackDirectoryKey string, fallbackPath string) ([]domain.ServerFileEntry, error) {
	var envelope runFileListEnvelope
	if err := json.Unmarshal([]byte(content), &envelope); err != nil {
		return nil, err
	}
	entries := make([]domain.ServerFileEntry, 0, len(envelope.Entries))
	for _, entry := range envelope.Entries {
		kind := domain.ServerFileEntryFile
		if entry.Kind == string(domain.ServerFileEntryDirectory) {
			kind = domain.ServerFileEntryDirectory
		}
		modifiedAt := time.Time{}
		if entry.ModifiedAt != "" {
			modifiedAt, _ = time.Parse(time.RFC3339, entry.ModifiedAt)
		}
		directoryKey := entry.DirectoryKey
		if directoryKey == "" {
			directoryKey = fallbackDirectoryKey
		}
		relativePath := cleanServerFileRelativePath(entry.RelativePath)
		if relativePath == "" && entry.Name != "" {
			relativePath = cleanServerFileRelativePath(path.Join(fallbackPath, entry.Name))
		} else if relativePath == "" {
			relativePath = fallbackPath
		}
		editable := kind == domain.ServerFileEntryFile
		downloadable := kind == domain.ServerFileEntryFile
		entries = append(entries, domain.ServerFileEntry{Name: entry.Name, Kind: kind, DirectoryKey: directoryKey, RelativePath: relativePath, LogicalKey: entry.LogicalKey, Scope: entry.Scope, SizeBytes: entry.SizeBytes, ModifiedAt: modifiedAt, Checksum: entry.Checksum, Editable: editable, Downloadable: downloadable, Remark: entry.Remark})
	}
	return entries, nil
}

func filterServerFileEntries(entries []domain.ServerFileEntry, query string) []domain.ServerFileEntry {
	query = strings.ToLower(strings.TrimSpace(query))
	if query == "" {
		return domain.CopyServerFileEntries(entries)
	}
	filtered := make([]domain.ServerFileEntry, 0, len(entries))
	for _, entry := range entries {
		if strings.Contains(strings.ToLower(entry.Name+" "+entry.RelativePath+" "+entry.LogicalKey+" "+entry.Remark), query) {
			filtered = append(filtered, entry)
		}
	}
	return filtered
}

func (svc *CoreService) latestFileListJob(serverInstanceID string, directoryKey string, relativePath string) (domain.Job, bool, error) {
	jobs, err := svc.store.Jobs().List(domain.JobFilter{ServerInstanceID: serverInstanceID})
	if err != nil {
		return domain.Job{}, false, err
	}
	var latest domain.Job
	found := false
	for _, job := range jobs {
		if job.Capability != domain.JobCapabilityFilesList || job.TargetKey != directoryKey {
			continue
		}
		if job.ExecutionInput.Inputs["path"] != relativePath {
			continue
		}
		if !found || job.UpdatedAt.After(latest.UpdatedAt) || job.CreatedAt.After(latest.CreatedAt) {
			latest = job
			found = true
		}
	}
	return domain.CopyJob(latest), found, nil
}

func isServerFileCapability(capability string) bool {
	switch capability {
	case domain.JobCapabilityFilesList, domain.JobCapabilityFilesRead, domain.JobCapabilityFilesWrite:
		return true
	default:
		return false
	}
}

func (svc *CoreService) latestFileReadJob(serverInstanceID string, key string) (domain.Job, bool, error) {
	return svc.latestServerFileJob(serverInstanceID, domain.JobCapabilityFilesRead, key)
}

func (svc *CoreService) latestServerFileJob(serverInstanceID string, capability string, targetKey string) (domain.Job, bool, error) {
	jobs, err := svc.store.Jobs().List(domain.JobFilter{ServerInstanceID: serverInstanceID})
	if err != nil {
		return domain.Job{}, false, err
	}
	var latest domain.Job
	found := false
	for _, job := range jobs {
		if job.Capability != capability || job.TargetKey != targetKey {
			continue
		}
		if !found || job.UpdatedAt.After(latest.UpdatedAt) || job.CreatedAt.After(latest.CreatedAt) {
			latest = job
			found = true
		}
	}
	return domain.CopyJob(latest), found, nil
}

func (svc *CoreService) putBrowserFileArtifact(artifact domain.Artifact, payload []byte) error {
	svc.artifactMu.Lock()
	defer svc.artifactMu.Unlock()
	if existing, err := svc.store.Artifacts().Get(artifact.ID); err == nil {
		if existing.OwnerKind != artifact.OwnerKind || existing.OwnerID != artifact.OwnerID || existing.SizeBytes != artifact.SizeBytes || existing.Checksum != artifact.Checksum || existing.State != domain.ArtifactStateAvailable {
			return validationError("file upload idempotency key conflicts with existing artifact")
		}
	} else if !errors.Is(err, repo.ErrNotFound) {
		return err
	} else {
		if err := validator.ValidateArtifact(artifact); err != nil {
			return err
		}
		if err := svc.store.Artifacts().Create(artifact); err != nil {
			return err
		}
	}
	if err := svc.artifactStore.PutPayload(artifact.ID, payload); err != nil {
		return err
	}
	svc.cacheArtifactPayload(artifact.ID, payload)
	return nil
}

func cleanServerFileRelativePath(value string) string {
	value = strings.TrimSpace(strings.ReplaceAll(value, "\\", "/"))
	if value == "" || value == "." {
		return ""
	}
	cleaned := path.Clean(value)
	if cleaned == "." {
		return ""
	}
	return strings.TrimPrefix(cleaned, "/")
}

func serverFileUploadArtifactID(serverInstanceID string, idempotencyKey string, relativePath string) string {
	raw := serverInstanceID + ":" + idempotencyKey + ":" + relativePath
	return "artifact-file-upload-" + sanitizeIDPart(serverInstanceID) + "-" + fmt.Sprint(stableStringNumber(raw))
}

func fileManagerInlineInputRef(serverInstanceID string, key string, idempotencyKey string) string {
	return "input://server-files/" + sanitizeIDPart(serverInstanceID) + "/" + sanitizeIDPart(key) + "/" + fmt.Sprint(stableStringNumber(idempotencyKey))
}

func fileRemark(file domain.PluginLogicalFile) string {
	if file.StreamKey != "" {
		return "日志流 " + file.StreamKey
	}
	if file.Editable {
		return "可编辑配置"
	}
	return "文件"
}

func serverFileDisplayName(workspace domain.PluginFileWorkspace, key string) string {
	for _, file := range workspace.Files {
		if file.Key == key && strings.TrimSpace(file.Label) != "" {
			return file.Label
		}
	}
	name := path.Base(key)
	if name == "." || name == "/" || name == "" {
		return "server-file.txt"
	}
	return name
}