package cmd

import (
	"fmt"
	"os"

	"github.com/aisim/kb-cli/internal/index"
	"github.com/spf13/cobra"
)

var indexCmd = &cobra.Command{
	Use:   "index",
	Short: "索引管理",
	Long:  `管理知识库索引`,
}

var indexBuildCmd = &cobra.Command{
	Use:   "build",
	Short: "构建/重建索引",
	Long:  `构建或重建知识库索引`,
	RunE:  runIndexBuild,
}

var indexStatusCmd = &cobra.Command{
	Use:   "status",
	Short: "查看索引状态",
	Long:  `查看索引状态信息`,
	RunE:  runIndexStatus,
}

func init() {
	rootCmd.AddCommand(indexCmd)
	indexCmd.AddCommand(indexBuildCmd)
	indexCmd.AddCommand(indexStatusCmd)
}

func runIndexBuild(cmd *cobra.Command, args []string) error {
	// 打开索引
	store, err := index.Open(dbPath)
	if err != nil {
		return fmt.Errorf("打开索引失败: %w", err)
	}
	defer store.Close()

	// 获取当前 commit
	commit, err := index.GetGitCommit(vaultPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "警告: 无法获取 git commit:", err)
		commit = ""
	}

	fmt.Fprintln(os.Stderr, "正在重建索引...")
	if err := rebuildIndex(store, commit); err != nil {
		return fmt.Errorf("重建索引失败: %w", err)
	}

	fmt.Fprintln(os.Stderr, "索引重建完成")
	return nil
}

func runIndexStatus(cmd *cobra.Command, args []string) error {
	// 打开索引
	store, err := index.Open(dbPath)
	if err != nil {
		return fmt.Errorf("打开索引失败: %w", err)
	}
	defer store.Close()

	// 获取元信息
	gitCommit, err := store.GetMeta("git_commit")
	if err != nil {
		return fmt.Errorf("获取元信息失败: %w", err)
	}
	builtAt, _ := store.GetMeta("built_at")

	// 获取节点数
	nodeCount, err := store.NodeCount()
	if err != nil {
		return fmt.Errorf("获取节点数失败: %w", err)
	}

	// 获取边数
	edgeCount, err := store.EdgeCount()
	if err != nil {
		return fmt.Errorf("获取边数失败: %w", err)
	}

	// 获取当前 commit
	currentCommit, err := index.GetGitCommit(vaultPath)
	if err != nil {
		currentCommit = ""
	}

	// 输出状态
	fmt.Printf("索引状态:\n")
	fmt.Printf("  知识库路径: %s\n", vaultPath)
	fmt.Printf("  索引文件: %s\n", dbPath)
	fmt.Printf("  节点数: %d\n", nodeCount)
	fmt.Printf("  边数: %d\n", edgeCount)
	fmt.Printf("  索引 commit: %s\n", gitCommit)
	fmt.Printf("  当前 commit: %s\n", currentCommit)
	fmt.Printf("  构建时间: %s\n", builtAt)

	// 检查是否需要更新
	needsRebuild, _, err := index.NeedsRebuild(store, vaultPath)
	if err != nil {
		return fmt.Errorf("检查索引状态失败: %w", err)
	}

	if needsRebuild {
		fmt.Printf("  状态: 需要更新\n")
	} else {
		fmt.Printf("  状态: 最新\n")
	}

	return nil
}