package index

import (
	"os/exec"
	"strings"
)

// GetGitCommit 获取知识库当前 git commit hash
func GetGitCommit(vaultPath string) (string, error) {
	cmd := exec.Command("git", "-C", vaultPath, "rev-parse", "HEAD")
	out, err := cmd.Output()
	if err != nil {
		return "", err // 不是 git 仓库
	}
	return strings.TrimSpace(string(out)), nil
}

// NeedsRebuild 检查是否需要重建索引
func NeedsRebuild(store *Store, vaultPath string) (bool, string, error) {
	currentCommit, err := GetGitCommit(vaultPath)
	if err != nil {
		// 不是 git 仓库，总是需要重建
		return true, "", nil
	}

	storedCommit, err := store.GetMeta("git_commit")
	if err != nil {
		return true, currentCommit, nil
	}

	if storedCommit == "" {
		// 没有记录，需要重建
		return true, currentCommit, nil
	}

	if storedCommit != currentCommit {
		// commit 变了，需要重建
		return true, currentCommit, nil
	}

	// 检查是否有节点
	count, _ := store.NodeCount()
	if count == 0 {
		return true, currentCommit, nil
	}

	return false, currentCommit, nil
}