package filewebdav

import (
	"log/slog"
	"net/http"
	"os"
	"path/filepath"

	"github.com/yourusername/caldav-server/internal/auth"
	"github.com/yourusername/caldav-server/internal/config"
	xwebdav "golang.org/x/net/webdav"
)

// NewHandler returns an http.Handler that provides standard WebDAV file access
// per-user under dataDir/files/<username>/.
func NewHandler(cfg *config.Config, dataDir string, logger *slog.Logger) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		p := auth.FromContext(r.Context())
		if p == nil {
			w.WriteHeader(http.StatusUnauthorized)
			return
		}

		userDir := filepath.Join(dataDir, "files", p.Username)
		logger.Debug(userDir)
		if err := os.MkdirAll(userDir, 0o755); err != nil {
			logger.Error("creating user WebDAV dir", "user", p.Username, "error", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}

		// Each user gets their own isolated WebDAV handler so paths don't bleed.
		h := &xwebdav.Handler{
			FileSystem: xwebdav.Dir(userDir),
			LockSystem: xwebdav.NewMemLS(),
			Logger: func(r *http.Request, err error) {
				if err != nil {
					logger.Warn("WebDAV error",
						"user", p.Username,
						"method", r.Method,
						"path", r.URL.Path,
						"error", err)
				}
			},
			Prefix: "/", //fmt.Sprintf("/files/%s", p.Username),
		}
		h.ServeHTTP(w, r)
	})
}