package api

import (
	"fmt"
	"io/ioutil"
	"os"
	"path"
	"strings"
	"time"

	"github.com/julienschmidt/httprouter"
)

var TimestampCheck = "submissions"

func init() {
	router.GET("/api/timestamps.json", apiHandler(
		func(httprouter.Params, []byte) (interface{}, error) {
			if stat, err := os.Stat(TimestampCheck); err != nil {
				return nil, err
			} else {
				now := time.Now().UTC()
				return map[string]interface{}{
					"frontend": stat.ModTime().UTC(),
					"backend": now,
					"diffFB": now.Sub(stat.ModTime()),
				}, nil
			}
		}))
	router.GET("/api/health.json", apiHandler(GetHealth))
}

func getHealth(pathname string) (ret []string) {
	if ds, err := ioutil.ReadDir(pathname); err != nil {
		ret = append(ret, fmt.Sprintf("%s: unable to ReadDir: %s", strings.TrimPrefix(pathname, TimestampCheck), err))
		return
	} else {
		for _, d := range ds {
			p := path.Join(pathname, d.Name())
			if d.IsDir() && d.Name() != ".tmp" && d.Mode()&os.ModeSymlink == 0 {
				ret = append(ret, getHealth(p)...)
			} else if !d.IsDir() && d.Mode()&os.ModeSymlink == 0 {
				ret = append(ret, fmt.Sprintf("%s/%s: existing untreated file.", strings.TrimPrefix(pathname, TimestampCheck), d.Name()))
			}
		}
		return
	}
}

func GetHealth(httprouter.Params, []byte) (interface{}, error) {
	if _, err := os.Stat(TimestampCheck); err != nil {
		return nil, err
	} else {
		return getHealth(TimestampCheck), nil
	}
}