package utils

import (
    "crypto/rand"
    "encoding/hex"
    "fmt"
    "net/url"
    "os"
    "path/filepath"
    "strings"
    "time"
)

// GenerateID creates a unique identifier
func GenerateID() string {
    b := make([]byte, 8)
    rand.Read(b)
    return hex.EncodeToString(b)
}

// Now returns current time
func Now() time.Time {
    return time.Now()
}

// IsValidGitHubURL validates if a URL is a valid GitHub repository URL
func IsValidGitHubURL(u string) bool {
    parsed, err := url.Parse(u)
    if err != nil {
        return false
    }

    if parsed.Host != "github.com" && parsed.Host != "www.github.com" {
        return false
    }

    parts := strings.Split(strings.Trim(parsed.Path, "/"), "/")
    return len(parts) >= 2
}

// SaveResult stores analysis result and diagram (in-memory for now)
func SaveResult(id string, diagram interface{}) {
    // In production, store in database or cache
    // For now, we'll use a simple in-memory map
    getDiagramStore()[id] = diagram
}

// GetDiagram retrieves a diagram by ID
func GetDiagram(id string) interface{} {
    store := getDiagramStore()
    if diagram, ok := store[id]; ok {
        return diagram
    }
    return nil
}

// GetStatus retrieves analysis status (simplified)
func GetStatus(id string) map[string]interface{} {
    // In production, this would fetch from database
    diagram := GetDiagram(id)
    if diagram == nil {
        return nil
    }
    return map[string]interface{}{
        "id":     id,
        "status": "completed",
    }
}

// In-memory storage (for development only)
var diagramStore = make(map[string]interface{})

func getDiagramStore() map[string]interface{} {
    return diagramStore
}

// CountLines counts lines in a directory (simplified)
func CountLines(dir string) int {
    total := 0
    filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) error {
        if err != nil || d.IsDir() {
            return nil
        }
        
        // Skip binary files and certain extensions
        ext := strings.ToLower(filepath.Ext(path))
        skipExts := map[string]bool{
            ".png": true, ".jpg": true, ".jpeg": true, ".gif": true,
            ".pdf": true, ".zip": true, ".tar": true, ".gz": true,
        }
        if skipExts[ext] {
            return nil
        }

        data, err := os.ReadFile(path)
        if err != nil {
            return nil
        }

        lines := strings.Count(string(data), "\n")
        if len(data) > 0 && !strings.HasSuffix(string(data), "\n") {
            lines++
        }
        total += lines
        return nil
    })
    return total
}

// CountDirectories counts directories in a structure
func CountDirectories(root models.RepositoryStructure) int {
    count := 0
    var walk func(models.RepositoryStructure)
    walk = func(node models.RepositoryStructure) {
        if node.Type == "directory" {
            count++
        }
        for _, child := range node.Children {
            walk(child)
        }
    }
    walk(root)
    return count
}

// RunCommand executes a shell command (placeholder)
func RunCommand(command string) error {
    // In production, use exec.Command
    return fmt.Errorf("not implemented")
}

// Models reference (to avoid circular import)
type RepositoryStructure struct {
    Name     string
    Type     string
    Path     string
    Children []RepositoryStructure
}