package filemanager

import (
	"net/url"
	"os"
	"path"
	"strings"

	"github.com/mholt/caddy/caddyhttp/httpserver"
	"github.com/mholt/caddy/caddyhttp/staticfiles"
)

// A Listing is the context used to fill out a template.
type Listing struct {
	// The name of the directory (the last element of the path)
	Name string

	// The full path of the request
	Path string

	// Whether the parent directory is browsable
	CanGoUp bool

	// The items (files and folders) in the path
	Items []FileInfo

	// The number of directories in the listing
	NumDirs int

	// The number of files (items that aren't directories) in the listing
	NumFiles int

	// Which sorting order is used
	Sort string

	// And which order
	Order string

	// If ≠0 then Items have been limited to that many elements
	ItemsLimitedTo int

	// Optional custom variables for use in browse templates
	User interface{}

	// StyleSheet to costumize the page
	StyleSheet string

	httpserver.Context
}

func directoryListing(files []os.FileInfo, canGoUp bool, urlPath string) (Listing, bool) {
	var (
		fileinfos           []FileInfo
		dirCount, fileCount int
		hasIndexFile        bool
	)

	for _, f := range files {
		name := f.Name()

		for _, indexName := range staticfiles.IndexPages {
			if name == indexName {
				hasIndexFile = true
				break
			}
		}

		if f.IsDir() {
			name += "/"
			dirCount++
		} else {
			fileCount++
		}

		url := url.URL{Path: "./" + name} // prepend with "./" to fix paths with ':' in the name

		fileinfos = append(fileinfos, FileInfo{
			IsDir:   f.IsDir(),
			Name:    f.Name(),
			Size:    f.Size(),
			URL:     url.String(),
			ModTime: f.ModTime().UTC(),
			Mode:    f.Mode(),
		})
	}

	return Listing{
		Name:     path.Base(urlPath),
		Path:     urlPath,
		CanGoUp:  canGoUp,
		Items:    fileinfos,
		NumDirs:  dirCount,
		NumFiles: fileCount,
	}, hasIndexFile
}

// BreadcrumbMap returns l.Path where every element is a map
// of URLs and path segment names.
func (l Listing) BreadcrumbMap() map[string]string {
	result := map[string]string{}

	if len(l.Path) == 0 {
		return result
	}

	// skip trailing slash
	lpath := l.Path
	if lpath[len(lpath)-1] == '/' {
		lpath = lpath[:len(lpath)-1]
	}

	parts := strings.Split(lpath, "/")
	for i, part := range parts {
		if i == 0 && part == "" {
			// Leading slash (root)
			result["/"] = "/"
			continue
		}
		result[strings.Join(parts[:i+1], "/")] = part
	}

	return result
}