package interfaces

import (
	"context"
	"io"

	"gitea.unprism.ru/KRBL/Agate/store"
)

// SnapshotManager is an interface that defines operations for managing and interacting with snapshots.
type SnapshotManager interface {
	// CreateSnapshot creates a new snapshot from the specified source directory, associating it with a given name and parent ID.
	// Returns the created Snapshot with its metadata or an error if the process fails.
	CreateSnapshot(ctx context.Context, sourceDir string, name string, parentID string) (*store.Snapshot, error)

	// GetSnapshotDetails retrieves detailed metadata for a specific snapshot identified by its unique snapshotID.
	// Returns a Snapshot object containing metadata
	GetSnapshotDetails(ctx context.Context, snapshotID string) (*store.Snapshot, error)

	// ListSnapshots retrieves a list of available snapshots with filtering and pagination options.
	ListSnapshots(ctx context.Context, opts store.ListOptions) ([]store.SnapshotInfo, error)

	// DeleteSnapshot removes a snapshot identified by snapshotID. Returns an error if the snapshot does not exist or cannot be deleted.
	DeleteSnapshot(ctx context.Context, snapshotID string) error

	// OpenFile retrieves and opens a file from the specified snapshot, returning a readable stream and an error, if any.
	OpenFile(ctx context.Context, snapshotID string, filePath string) (io.ReadCloser, error)

	// ExtractSnapshot extracts the contents of a specified snapshot to a target directory at the given path.
	// If cleanTarget is true, the target directory will be cleaned before extraction.
	// Returns an error if the snapshot ID is invalid or the extraction fails.
	ExtractSnapshot(ctx context.Context, snapshotID string, path string, cleanTarget bool) error

	// UpdateSnapshotMetadata updates the metadata of an existing snapshot, allowing changes to its name.
	UpdateSnapshotMetadata(ctx context.Context, snapshotID string, newName string) error
}

// SnapshotServer defines the interface for a server that can share snapshots
type SnapshotServer interface {
	// Start initializes and begins the server's operation, handling incoming requests or processes within the provided context.
	Start(ctx context.Context) error

	// Stop gracefully shuts down the server, releasing any allocated resources and ensuring all operations are completed.
	Stop(ctx context.Context) error
}

// SnapshotClient defines the interface for a client that can connect to a server and download snapshots
type SnapshotClient interface {
	// ListSnapshots retrieves a list of snapshots from the server
	ListSnapshots(ctx context.Context) ([]store.SnapshotInfo, error)

	// FetchSnapshotDetails retrieves detailed information about a specific snapshot
	FetchSnapshotDetails(ctx context.Context, snapshotID string) (*store.Snapshot, error)

	// DownloadSnapshot downloads a snapshot from the server
	DownloadSnapshot(ctx context.Context, snapshotID string, targetDir string, localParentID string) error

	// Close closes the connection to the server
	Close() error
}