package api

import (
	"encoding/hex"
	"encoding/json"

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

	"github.com/julienschmidt/httprouter"
)

func init() {
	router.GET("/api/files/", apiHandler(listFiles))
	router.DELETE("/api/files/", apiHandler(clearFiles))

	router.GET("/api/files/:fileid", apiHandler(fileHandler(showFile)))
	router.PUT("/api/files/:fileid", apiHandler(fileHandler(updateFile)))
	router.DELETE("/api/files/:fileid", apiHandler(fileHandler(deleteFile)))

	router.GET("/api/exercices/:eid/files", apiHandler(exerciceHandler(listExerciceFiles)))
	router.POST("/api/exercices/:eid/files", apiHandler(exerciceHandler(createExerciceFile)))

	router.GET("/api/exercices/:eid/files/:fid", apiHandler(exerciceFileHandler(showFile)))
	router.PUT("/api/exercices/:eid/files/:fid", apiHandler(exerciceFileHandler(updateFile)))
	router.DELETE("/api/exercices/:eid/files/:fid", apiHandler(exerciceFileHandler(deleteFile)))

	// Check
	router.POST("/api/files/:fileid/check", apiHandler(fileHandler(checkFile)))

	// Synchronize
	router.POST("/api/sync/exercices/:eid/files", apiHandler(exerciceHandler(
		func(exercice fic.Exercice, _ []byte) (interface{}, error) {
			return sync.SyncExerciceFiles(sync.GlobalImporter, exercice), nil
		})))
}

func listFiles(_ httprouter.Params, body []byte) (interface{}, error) {
	// List all files
	return fic.GetFiles()
}

func listExerciceFiles(exercice fic.Exercice, body []byte) (interface{}, error) {
	return exercice.GetFiles()
}

func clearFiles(_ httprouter.Params, _ []byte) (interface{}, error) {
	return fic.ClearFiles()
}

func showFile(file fic.EFile, _ []byte) (interface{}, error) {
	return file, nil
}

type uploadedFile struct {
	URI    string
	Digest string
}

func createExerciceFile(exercice fic.Exercice, body []byte) (interface{}, error) {
	var uf uploadedFile
	if err := json.Unmarshal(body, &uf); err != nil {
		return nil, err
	}

	return sync.ImportFile(sync.GlobalImporter, uf.URI,
		func(filePath string, origin string) (interface{}, error) {
			if digest, err := hex.DecodeString(uf.Digest); err != nil {
				return nil, err
			} else {
				return exercice.ImportFile(filePath, origin, digest)
			}
		})
}

func updateFile(file fic.EFile, body []byte) (interface{}, error) {
	var uf fic.EFile
	if err := json.Unmarshal(body, &uf); err != nil {
		return nil, err
	}

	uf.Id = file.Id

	if _, err := uf.Update(); err != nil {
		return nil, err
	} else {
		return uf, nil
	}
}

func deleteFile(file fic.EFile, _ []byte) (interface{}, error) {
	return file.Delete()
}

func checkFile(file fic.EFile, _ []byte)  (interface{}, error) {
	return true, file.CheckFileOnDisk()
}