package handler

import (
	"encoding/json"
	"fmt"
	"gosimplenpm/internal/config"
	"gosimplenpm/internal/serviceidos"
	"gosimplenpm/internal/storage"
	"net/http"
	"net/url"
	"path"
	"strings"

	"github.com/gorilla/mux"
	"github.com/sirupsen/logrus"
)

type NPMClientPutRequest struct {
	Request serviceidos.IndexJson
}

func Publish(lg *logrus.Logger, cfg config.Config) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// (1) Parse Json Body
		// (2) Check if package exists in the folder.
		// (a) if it does, ckeck if it is the same version. If it is, return error. Else modify index.json from (2)
		// (b) If it does not, add the latest tag to the new index.json

		escapedName := mux.Vars(r)["name"]
		packageName, _ := url.PathUnescape(escapedName)
		lg.WithFields(logrus.Fields{
			"function": "publish",
		}).Debugf("Package name => %s\n", packageName)

		var cr NPMClientPutRequest
		// Parse json body
		err := json.NewDecoder(r.Body).Decode(&cr.Request)

		if err != nil {
			lg.WithFields(logrus.Fields{
				"function": "publish",
			}).Debugf("Error unmarshaling put request: %+v\n", err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		// Extract relevant data from index.json
		index := 0
		var tag string
		var version string
		var versionData serviceidos.IndexJsonVersions
		// TODO: Fix this as the order is not guaranteed
		for key, value := range cr.Request.DistTags {
			if index == 0 {
				tag = key
				version = value
				break
			}
			index++
		}
		versionData = cr.Request.Versions[version]
		lg.WithFields(logrus.Fields{
			"function": "publish",
		}).Debugf("For version(%s) with tag(%s), versionData => %+v\n", version, tag, versionData)

		// Rewrite the tarball path
		tarballFileName := strings.Split(versionData.Dist.Tarball, "/-/")[1]
		lg.WithFields(logrus.Fields{
			"function": "publish",
		}).Debugf("TarballName => %s\n", tarballFileName)
		// versionData.Dist.Tarball = fmt.Sprintf("file://%s", packageFilePath)
		versionData.Dist.Tarball = fmt.Sprintf("http://%s/%s/-/%s", r.Host, url.PathEscape(packageName), url.PathEscape(tarballFileName))
		lg.WithFields(logrus.Fields{
			"function": "publish",
		}).Debugf("versionData.Dist.Tarball => %s\n", versionData.Dist.Tarball)

		tarBallFile := strings.Split(tarballFileName, "/")[1]
		packageFilePath := path.Join(cfg.RepoDir, packageName, tarBallFile)

		// Try to get the index.json from the store
		fileToServe, found, err := storage.GetIndexJsonFromStore(packageName, cfg.RepoDir, lg)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		var jsonFile serviceidos.IndexJson
		if !found {
			// new package
			jsonFile = cr.Request
			jsonFile.DistTags["latest"] = version
		} else {
			// old package
			err = storage.ReadIndexJson(fileToServe, &jsonFile, lg)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}

			// Checking that you are not publishing over a pervious published version
			if jsonFile.Versions[version].Version == version {
				lg.WithFields(logrus.Fields{
					"function": "publish",
				}).Debugf("Version %s of package %s already exists!!\n", version, packageName)
				http.Error(w, err.Error(), http.StatusBadRequest)
				return
			}

			// Rewrite attachments
			jsonFile.DistTags[tag] = version
			nAttachments := make(map[string]serviceidos.IndexJsonAttachments)
			nAttachments[fmt.Sprintf("%s-%s.tgz", packageName, version)] = cr.Request.Attachments[fmt.Sprintf("%s-%s.tgz", packageName, version)]
			jsonFile.Attachments = nAttachments

			// Merge in the new version data
			jsonFile.Versions[version] = versionData
		}

		lg.WithFields(logrus.Fields{
			"function": "publish",
		}).Debugln("FiletoServe ==> ", fileToServe)

		// Write index.json
		err = storage.WriteIndexJson(fileToServe, &jsonFile, lg)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		lg.WithFields(logrus.Fields{
			"function": "publish",
		}).Debugln("Package path => ", packageFilePath)
		// Write bundled package
		packageData := jsonFile.Attachments[fmt.Sprintf("%s-%s.tgz", packageName, version)].Data
		err = storage.WritePackageToStore(packageFilePath, packageData, lg)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}

}