package cmd

import (
	"fmt"
	"os"

	"github.com/spf13/cobra"
	"github.com/yeho/doks/internal/registry"
	"github.com/yeho/doks/internal/storage"
)

var (
	addKey         string
	addPreserve    bool
	addTags        string
	addDescription string
)

var addCmd = &cobra.Command{
	Use:   "add <path>",
	Short: "Add a document to doks",
	Long: `Add a document to doks by copying it to the storage directory.
Use -p to create a symlink at the original location pointing to the stored file.`,
	Args: cobra.ExactArgs(1),
	Run: func(cmd *cobra.Command, args []string) {
		filePath := args[0]

		if addKey == "" {
			fmt.Fprintln(os.Stderr, "Error: -k (key) flag is required")
			os.Exit(1)
		}

		absPath, err := storage.GetAbsolutePath(filePath)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Error resolving path: %v\n", err)
			os.Exit(1)
		}

		// Check if file exists
		if _, err := os.Stat(absPath); os.IsNotExist(err) {
			fmt.Fprintf(os.Stderr, "Error: file not found: %s\n", absPath)
			os.Exit(1)
		}

		// Load registry
		reg, err := registry.Load(cfg.RegistryPath())
		if err != nil {
			fmt.Fprintf(os.Stderr, "Error loading registry: %v\n", err)
			os.Exit(1)
		}

		// Check if key already exists
		if reg.Exists(addKey) {
			fmt.Fprintf(os.Stderr, "Error: key '%s' already exists\n", addKey)
			os.Exit(1)
		}

		// Generate unique filename
		filename := storage.GenerateFilename(absPath)

		// Create storage and copy file
		store := storage.New(cfg.FilesDir())
		if err := store.CopyFile(absPath, filename); err != nil {
			fmt.Fprintf(os.Stderr, "Error copying file: %v\n", err)
			os.Exit(1)
		}

		// Remove original and create symlink if preserve flag is set
		if addPreserve {
			if err := os.Remove(absPath); err != nil {
				fmt.Fprintf(os.Stderr, "Error removing original file: %v\n", err)
				// Clean up copied file
				store.RemoveFile(filename)
				os.Exit(1)
			}

			if err := store.CreateSymlink(absPath, filename); err != nil {
				fmt.Fprintf(os.Stderr, "Error creating symlink: %v\n", err)
				os.Exit(1)
			}
		}

		// Parse tags
		var tags []string
		if addTags != "" {
			tags = splitTags(addTags)
		}

		// Create registry entry
		entry := &registry.Entry{
			Key:          addKey,
			Filename:     filename,
			OriginalPath: absPath,
			HasSymlink:   addPreserve,
			Tags:         tags,
			Description:  addDescription,
		}

		if err := reg.Add(entry); err != nil {
			fmt.Fprintf(os.Stderr, "Error adding to registry: %v\n", err)
			// Clean up
			store.RemoveFile(filename)
			if addPreserve {
				store.RemoveSymlink(absPath)
			}
			os.Exit(1)
		}

		fmt.Printf("Added '%s' with key '%s'\n", filePath, addKey)
	},
}

func init() {
	rootCmd.AddCommand(addCmd)
	addCmd.Flags().StringVarP(&addKey, "key", "k", "", "Unique key for the document (required)")
	addCmd.Flags().BoolVarP(&addPreserve, "preserve", "p", false, "Create symlink at original location")
	addCmd.Flags().StringVarP(&addTags, "tags", "t", "", "Comma-separated tags")
	addCmd.Flags().StringVarP(&addDescription, "description", "d", "", "Description of the document")
	addCmd.MarkFlagRequired("key")
}

func splitTags(tags string) []string {
	if tags == "" {
		return nil
	}
	result := []string{}
	for _, tag := range splitString(tags, ",") {
		tag = trimSpace(tag)
		if tag != "" {
			result = append(result, tag)
		}
	}
	return result
}

func splitString(s, sep string) []string {
	var result []string
	start := 0
	for i := 0; i < len(s); i++ {
		if i+len(sep) <= len(s) && s[i:i+len(sep)] == sep {
			result = append(result, s[start:i])
			start = i + len(sep)
		}
	}
	result = append(result, s[start:])
	return result
}

func trimSpace(s string) string {
	start := 0
	end := len(s)
	for start < end && (s[start] == ' ' || s[start] == '\t') {
		start++
	}
	for end > start && (s[end-1] == ' ' || s[end-1] == '\t') {
		end--
	}
	return s[start:end]
}