package core

import (
	"time"

	gogit "github.com/go-git/go-git/v5"
)

// Repository represents an Onyx repository with both Git and Onyx-specific metadata
type Repository interface {
	// Init initializes a new Onyx repository at the given path
	Init(path string) error

	// GetGitRepo returns the underlying Git repository
	GetGitRepo() *gogit.Repository

	// GetOnyxMetadata returns Onyx-specific metadata
	GetOnyxMetadata() *OnyxMetadata

	// Close releases any resources held by the repository
	Close() error
}

// GitBackend provides low-level Git object operations
type GitBackend interface {
	// CreateCommit creates a new commit object
	CreateCommit(tree, parent, message string) (string, error)

	// CreateTree creates a new tree object from the given entries
	CreateTree(entries []TreeEntry) (string, error)

	// UpdateRef updates a Git reference to point to a new SHA
	UpdateRef(name, sha string) error

	// GetRef retrieves the SHA that a reference points to
	GetRef(name string) (string, error)

	// CreateBlob creates a new blob object from content
	CreateBlob(content []byte) (string, error)

	// GetObject retrieves a Git object by its SHA
	GetObject(sha string) (Object, error)
}

// TreeEntry represents an entry in a Git tree object
type TreeEntry struct {
	Mode int    // File mode (e.g., 0100644 for regular file, 040000 for directory)
	Name string // Entry name
	SHA  string // Object SHA-1 hash
}

// Object represents a Git object (blob, tree, commit, or tag)
type Object interface {
	// Type returns the type of the object (blob, tree, commit, tag)
	Type() string

	// SHA returns the SHA-1 hash of the object
	SHA() string

	// Size returns the size of the object in bytes
	Size() int64
}

// OnyxMetadata holds Onyx-specific repository metadata
type OnyxMetadata struct {
	// Version of the Onyx repository format
	Version string

	// Created timestamp when the repository was initialized
	Created time.Time

	// Path to the .onx directory
	OnyxPath string
}