package http

import (
	"io"
	"io/fs"
	"net/http"
	"os"

	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/logger"
)

func serveFile(w http.ResponseWriter, r *http.Request, fs fs.FS, path string) {
	ctx := logger.With(r.Context(), logger.F("path", path))

	file, err := fs.Open(path)
	if err != nil {
		if errors.Is(err, os.ErrNotExist) {
			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)

			return
		}

		logger.Error(ctx, "error while opening fs file", logger.E(errors.WithStack(err)))
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)

		return
	}

	defer func() {
		if err := file.Close(); err != nil {
			logger.Error(ctx, "error while closing fs file", logger.E(errors.WithStack(err)))
		}
	}()

	info, err := file.Stat()
	if err != nil {
		logger.Error(ctx, "error while retrieving fs file stat", logger.E(errors.WithStack(err)))

		return
	}

	reader, ok := file.(io.ReadSeeker)
	if !ok {
		logger.Error(ctx, "could not convert file to readseeker", logger.E(errors.WithStack(err)))

		return
	}

	http.ServeContent(w, r, path, info.ModTime(), reader)
}