package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path"
	"path/filepath"

	"srs.epita.fr/fic-server/admin/sync"
	"srs.epita.fr/fic-server/libfic"
)

var skipFileChecks = false

func checkExercice(theme fic.Theme, edir string, dmap *map[int64]fic.Exercice) (errs []string) {
	e, _, eid, _, berrs := sync.BuildExercice(sync.GlobalImporter, theme, path.Join(theme.Path, edir), dmap)
	errs = append(errs, berrs...)

	if e != nil {
		// Files
		var files []string
		var cerrs []string
		if !skipFileChecks {
			files, cerrs = sync.CheckExerciceFiles(sync.GlobalImporter, *e)
			log.Printf("%d files checked.\n", len(files))
		} else {
			files, cerrs = sync.CheckExerciceFilesPresence(sync.GlobalImporter, *e)
			log.Printf("%d files presents but not checked (please check digest yourself).\n", len(files))
		}
		errs = append(errs, cerrs...)

		// Flags
		flags, cerrs := sync.CheckExerciceFlags(sync.GlobalImporter, *e, files)
		errs = append(errs, cerrs...)
		log.Printf("%d flags checked.\n", len(flags))

		// Hints
		hints, cerrs := sync.CheckExerciceHints(sync.GlobalImporter, *e)
		errs = append(errs, cerrs...)
		log.Printf("%d hints checked.\n", len(hints))

		if dmap != nil {
			(*dmap)[int64(eid)] = *e
		}
	}
	return
}

func main() {
	cloudDAVBase := ""
	cloudUsername := "fic"
	cloudPassword := ""
	localImporterDirectory := ""

	// Read paremeters from environment
	if v, exists := os.LookupEnv("FICCLOUD_URL"); exists {
		cloudDAVBase = v
	}
	if v, exists := os.LookupEnv("FICCLOUD_USER"); exists {
		cloudUsername = v
	}
	if v, exists := os.LookupEnv("FICCLOUD_PASS"); exists {
		cloudPassword = v
	}

	// Read parameters from command line
	flag.StringVar(&localImporterDirectory, "localimport", localImporterDirectory,
		"Base directory where to find challenges files to import, local part")
	flag.StringVar(&cloudDAVBase, "clouddav", cloudDAVBase,
		"Base directory where to find challenges files to import, cloud part")
	flag.StringVar(&cloudUsername, "clouduser", cloudUsername, "Username used to sync")
	flag.StringVar(&cloudPassword, "cloudpass", cloudPassword, "Password used to sync")
	flag.BoolVar(&fic.OptionalDigest, "optionaldigest", fic.OptionalDigest, "Is the digest required when importing files?")
	flag.BoolVar(&fic.StrongDigest, "strongdigest", fic.StrongDigest, "Are BLAKE2b digests required or is SHA-1 good enough?")
	flag.BoolVar(&skipFileChecks, "skipfiledigests", skipFileChecks, "Don't perform DIGESTS checks on file to speed up the checks")
	flag.BoolVar(&sync.LogMissingResolution, "skipresolution", sync.LogMissingResolution, "Don't fail if resolution.mp4 is absent")
	flag.Parse()

	log.SetPrefix("[repochecker] ")

	// Instantiate importer
	regenImporter := false
	if localImporterDirectory != "" {
		sync.GlobalImporter = sync.LocalImporter{Base: localImporterDirectory, Symlink: true}
	} else if cloudDAVBase != "" {
		sync.GlobalImporter, _ = sync.NewCloudImporter(cloudDAVBase, cloudUsername, cloudPassword)
	} else {
		// In this case, we want to treat the entier path given
		regenImporter = true
	}

	var err error

	// Create temporary directory for storing FILES/ content
	fic.FilesDir, err = ioutil.TempDir("", "fic-repochecker.")
	if err != nil {

	}
	defer os.RemoveAll(fic.FilesDir)


	if sync.GlobalImporter != nil {
		log.Println("Using", sync.GlobalImporter.Kind())

		if themes, err := sync.GetThemes(sync.GlobalImporter); err != nil {
			log.Fatal(err)
		} else if len(flag.Args()) == 0 {
			log.Println("Existing themes:")
			for _, th := range themes {
				log.Println("-", th)
			}
			os.Exit(1)
		}
	} else if len(flag.Args()) == 0 {
		log.Fatal("No importer nor path given!")
	}

	// Variable that handles the exit status
	hasError := false

	for _, p := range flag.Args() {
		if regenImporter {
			var err error
			p, err = filepath.Abs(p)
			if err != nil {
				p = path.Clean(p)
			}
			sync.GlobalImporter = sync.LocalImporter{
				Base: path.Dir(p),
				Symlink: true,
			}
			p = path.Base(p)
		}

		nberr := 0
		theme, errs := sync.BuildTheme(sync.GlobalImporter, p)

		if theme != nil {
			nberr += len(errs)
			for _, err := range errs {
				log.Println(err)
			}

			exercices, err := sync.GetExercices(sync.GlobalImporter, *theme)
			if err != nil {
				nberr += 1
				log.Println(err)
				continue
			}

			dmap := map[int64]fic.Exercice{}

			for _, edir := range exercices {
				for _, err := range checkExercice(*theme, edir, &dmap) {
					nberr += 1
					log.Println(err)
				}
				log.Printf("================================== Exercice %q treated\n", edir)
			}

			fmt.Printf("\n")
			log.Printf("Theme %q treated. %d error(s) reported.\n\n", p, nberr)
		} else {
			log.Printf("This is not a theme directory, run checks for exercice.\n\n")

			for _, err := range checkExercice(fic.Theme{}, p, &map[int64]fic.Exercice{}) {
				nberr += 1
				log.Println(err)
			}
			fmt.Printf("\n")
			log.Printf("Exercice %q treated. %d error(s) reported.\n", p, nberr)
		}

		if nberr > 0 {
			hasError = true
		}
	}

	if hasError {
		os.Exit(1)
	}
}