package cmd

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

	ignore "github.com/sabhiram/go-gitignore"
	"github.com/zemenawi/zutils/pkg/colors"
	"github.com/zemenawi/zutils/pkg/formatter"
)

type FileItem struct {
	Path     string
	Size     int64
	Ignored  bool
	RelPath  string
}

type DirStats struct {
	TotalSize          int64
	TotalSizeIgnoring  int64
	FileCount          int
	DirCount           int
	IgnoredFileCount   int
	IgnoredSize        int64
	LargestFiles       []FileItem
	LargestDirs        []FileItem
	LastModified       time.Time
	FileExtensions     map[string]int
	HasGitignore       bool
}

func DirInfoCommand(args []string) error {
	if len(args) < 1 {
		return fmt.Errorf("please specify a directory path")
	}

	dirPath := args[0]

	showIgnored := false
	if len(args) > 1 && args[1] == "--all" {
		showIgnored = true
	}

	stats, err := analyzeDirectory(dirPath, showIgnored)
	if err != nil {
		return fmt.Errorf("error analyzing directory: %w", err)
	}

	size := formatter.FormatSize(stats.TotalSize)
	ignoringSize := formatter.FormatSize(stats.TotalSizeIgnoring)
	modTime := stats.LastModified.Format(time.RFC1123)

	PrintBoxHeader("DIRECTORY INFORMATION", colors.Purple)

	fmt.Printf("%s%s📁 Path:%s          %s\n", colors.Blue, colors.Bold, colors.Reset, dirPath)
	fmt.Printf("%s%s📏 Total Size:%s    %s\n", colors.Blue, colors.Bold, colors.Reset, size)
	if stats.HasGitignore {
		fmt.Printf("%s%s📏 Size (excl. ignored):%s %s\n", colors.Blue, colors.Bold, colors.Reset, ignoringSize)
		fmt.Printf("%s%s🚫 Ignored:%s       %d files (%s)\n", colors.Gray, colors.Bold, colors.Reset, stats.IgnoredFileCount, formatter.FormatSize(stats.IgnoredSize))
	}
	fmt.Printf("%s%s📊 Files:%s         %d\n", colors.Blue, colors.Bold, colors.Reset, stats.FileCount)
	fmt.Printf("%s%s📂 Directories:%s   %d\n", colors.Blue, colors.Bold, colors.Reset, stats.DirCount)
	fmt.Println()

	if len(stats.LargestFiles) > 0 {
		PrintSectionHeader("LARGEST FILES")
		headers := []string{"#", "File Name", "Size"}
		if stats.HasGitignore {
			headers = []string{"#", "File Name", "Size", "Status"}
		}
		data := make([][]string, 0, len(stats.LargestFiles))

		for i, file := range stats.LargestFiles {
			name := file.RelPath
			row := []string{
				fmt.Sprintf("%d", i+1),
				name,
				formatter.FormatSize(file.Size),
			}
			if stats.HasGitignore {
				if file.Ignored {
					row = append(row, colors.Gray+"[ignored]"+colors.Reset)
				} else {
					row = append(row, "")
				}
			}
			data = append(data, row)
		}

		printSimpleTable(headers, data)
	}

	if len(stats.LargestDirs) > 0 {
		PrintSectionHeader("LARGEST DIRS")
		headers := []string{"#", "Directory Name", "Size"}
		data := make([][]string, 0, len(stats.LargestDirs))

		for i, dir := range stats.LargestDirs {
			name := dir.RelPath
			row := []string{
				fmt.Sprintf("%d", i+1),
				name,
				formatter.FormatSize(dir.Size),
			}
			data = append(data, row)
		}

		printSimpleTable(headers, data)
	}

	if len(stats.FileExtensions) > 0 {
		PrintSectionHeader("FILE TYPE DISTRIBUTION")
		type extCount struct {
			ext   string
			count int
		}
		var sortedExts []extCount
		for ext, count := range stats.FileExtensions {
			sortedExts = append(sortedExts, extCount{ext, count})
		}
		sort.Slice(sortedExts, func(i, j int) bool {
			return sortedExts[i].count > sortedExts[j].count
		})

		maxShow := 10
		if len(sortedExts) < maxShow {
			maxShow = len(sortedExts)
		}

		headers := []string{"#", "Extension", "File Count", "Percentage"}
		data := make([][]string, 0, maxShow)

		for i := 0; i < maxShow; i++ {
			ext := sortedExts[i].ext
			if ext == "" {
				ext = "(no extension)"
			}
			percentage := float64(sortedExts[i].count) / float64(stats.FileCount) * 100
			row := []string{
				fmt.Sprintf("%d", i+1),
				ext,
				fmt.Sprintf("%d", sortedExts[i].count),
				fmt.Sprintf("%.1f%%", percentage),
			}
			data = append(data, row)
		}

		printSimpleTable(headers, data)
	}

	PrintSectionHeader("DIRECTORY DETAILS")
	fmt.Printf("%s%s📅 Last Modified:%s %s\n", colors.Yellow, colors.Bold, colors.Reset, modTime)
	if stats.HasGitignore {
		fmt.Printf("%s%s📜 Gitignore:%s      %s\n", colors.Green, colors.Bold, colors.Reset, "Detected")
	}
	fmt.Println()

	return nil
}

func printSimpleTable(headers []string, data [][]string) {
	formatter.PrintTable(headers, data, colors.Cyan)
	fmt.Println()
}

func analyzeDirectory(path string, showIgnored bool) (*DirStats, error) {
	stats := &DirStats{
		LargestFiles:   make([]FileItem, 0),
		LargestDirs:    make([]FileItem, 0),
		FileExtensions: make(map[string]int),
	}

	ignoreMatcher, err := ignore.CompileIgnoreFile(filepath.Join(path, ".gitignore"))
	if err == nil {
		stats.HasGitignore = true
		_ = ignoreMatcher
	}

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

		relPath, _ := filepath.Rel(path, filePath)

		if filePath == path {
			return nil
		}

		ignored := false
		if stats.HasGitignore {
			ignored = ignoreMatcher.MatchesPath(relPath)
		}

		if info.IsDir() {
			if !ignored || showIgnored {
				stats.DirCount++
				stats.LargestDirs = appendSorted(stats.LargestDirs, FileItem{
					Path:    filePath,
					Size:    info.Size(),
					Ignored: ignored,
					RelPath: relPath,
				}, 5)
			}
		} else {
			stats.FileCount++
			stats.TotalSize += info.Size()

			if ignored {
				stats.IgnoredFileCount++
				stats.IgnoredSize += info.Size()
			} else {
				stats.TotalSizeIgnoring += info.Size()
			}

			ext := filepath.Ext(filePath)
			stats.FileExtensions[ext]++

			if !ignored || showIgnored {
				stats.LargestFiles = appendSorted(stats.LargestFiles, FileItem{
					Path:    filePath,
					Size:    info.Size(),
					Ignored: ignored,
					RelPath: relPath,
				}, 5)
			}

			if info.ModTime().After(stats.LastModified) {
				stats.LastModified = info.ModTime()
			}
		}

		return nil
	})

	return stats, err
}

func appendSorted(items []FileItem, newItem FileItem, maxSize int) []FileItem {
	items = append(items, newItem)

	sort.Slice(items, func(i, j int) bool {
		return items[i].Size > items[j].Size
	})

	if len(items) > maxSize {
		items = items[:maxSize]
	}

	return items
}