package cmd

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"time"

	"github.com/zemenawi/zutils/pkg/colors"
	"github.com/zemenawi/zutils/pkg/formatter"
)

type FindOptions struct {
	Pattern     string
	SizeMin     int64
	SizeMax     int64
	ModifiedDays int
	FileType    string
	MaxDepth    int
	ShowHidden  bool
}

type FindResult struct {
	Path        string
	Size        int64
	Modified    time.Time
	IsDir       bool
	Permissions string
}

func FindCommand(args []string) error {
	fs := flag.NewFlagSet("find", flag.ContinueOnError)
	options := FindOptions{}

	fs.StringVar(&options.Pattern, "name", "*", "File name pattern (glob)")
	fs.StringVar(&options.FileType, "type", "", "File type: f (file), d (dir)")
	sizeMin := fs.Int64("size-min", 0, "Minimum size in bytes")
	sizeMax := fs.Int64("size-max", 0, "Maximum size in bytes")
	modifiedDays := fs.Int("mtime", 0, "Modified within N days")
	maxDepth := fs.Int("depth", -1, "Maximum directory depth")
	showHidden := fs.Bool("hidden", false, "Show hidden files")

	if err := fs.Parse(args); err != nil {
		if err == flag.ErrHelp {
			return nil
		}
		return fmt.Errorf("invalid arguments: %v\n\nUsage: z find [path] [options]\n\nOptions:\n%s\n\nExamples:\n  z find . -name '*.go'          Find all Go files\n  z find . -mtime 7              Files modified in last 7 days\n  z find . -size +1m             Files larger than 1MB\n  z find . -type d               Directories only", err, getFlagDefaults(fs))
	}

	options.SizeMin = *sizeMin
	options.SizeMax = *sizeMax
	options.ModifiedDays = *modifiedDays
	options.MaxDepth = *maxDepth
	options.ShowHidden = *showHidden

	path := "."
	if fs.NArg() > 0 {
		path = fs.Arg(0)
	}

	if path == "" {
		return fmt.Errorf("missing search path\n\nUsage: z find [path] [options]")
	}

	results, err := findFiles(path, options)
	if err != nil {
		return fmt.Errorf("error finding files: %v", err)
	}

	if len(results) == 0 {
		fmt.Printf("%sNo files found matching criteria%s\n", colors.Gray, colors.Reset)
		return nil
	}

	sort.Slice(results, func(i, j int) bool {
		return results[i].Modified.After(results[j].Modified)
	})

	PrintBoxHeader(fmt.Sprintf("FIND RESULTS (%d files)", len(results)), colors.Green)

	headers := []string{"Path", "Size", "Modified"}
	data := make([][]string, 0, len(results))

	for _, result := range results {
		relPath := result.Path
		if strings.Contains(relPath, "/") {
			parts := strings.Split(relPath, "/")
			relPath = strings.Join(parts[len(parts)-2:], "/")
			if len(parts) > 2 {
				relPath = "..." + string(filepath.Separator) + strings.Join(parts[len(parts)-2:], "/")
			}
		}

		modStr := result.Modified.Format("Jan 02 15:04")
		if time.Since(result.Modified) > 30*24*time.Hour {
			modStr = result.Modified.Format("Jan 02  2006")
		}

		row := []string{
			relPath,
			formatter.FormatSize(result.Size),
			modStr,
		}
		data = append(data, row)
	}

	formatter.PrintTable(headers, data, colors.Cyan)
	fmt.Println()

	return nil
}

func getFlagDefaults(fs *flag.FlagSet) string {
	var result []string
	fs.VisitAll(func(f *flag.Flag) {
		result = append(result, fmt.Sprintf("  -%s  %s (default: %v)", f.Name, f.Usage, f.DefValue))
	})
	return strings.Join(result, "\n")
}

func findFiles(path string, opts FindOptions) ([]FindResult, error) {
	var results []FindResult

	err := filepath.Walk(path, func(filePath string, info os.FileInfo, err error) error {
		if err != nil {
			return nil
		}

		if filePath == path {
			return nil
		}

		if !opts.ShowHidden && filepath.Base(filePath)[0] == '.' {
			if info.IsDir() {
				return filepath.SkipDir
			}
			return nil
		}

		if opts.MaxDepth > 0 {
			relPath, _ := filepath.Rel(path, filePath)
			if strings.Count(relPath, string(filepath.Separator)) > opts.MaxDepth {
				if info.IsDir() {
					return filepath.SkipDir
				}
				return nil
			}
		}

		if opts.FileType == "f" && info.IsDir() {
			return nil
		}
		if opts.FileType == "d" && !info.IsDir() {
			return nil
		}

		baseName := filepath.Base(filePath)
		matched, err := filepath.Match(opts.Pattern, baseName)
		if err != nil || !matched {
			return nil
		}

		if opts.SizeMin > 0 && info.Size() < opts.SizeMin {
			return nil
		}
		if opts.SizeMax > 0 && info.Size() > opts.SizeMax {
			return nil
		}

		if opts.ModifiedDays > 0 {
			cutoff := time.Now().AddDate(0, 0, -opts.ModifiedDays)
			if info.ModTime().Before(cutoff) {
				return nil
			}
		}

		results = append(results, FindResult{
			Path:        filePath,
			Size:        info.Size(),
			Modified:    info.ModTime(),
			IsDir:       info.IsDir(),
			Permissions: info.Mode().String(),
		})

		return nil
	})

	return results, err
}