package handler

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

	"github.com/gorilla/mux"
)

type NPMClientPutRequest struct {
	Request serviceidos.IndexJson
}

func Publish(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)
	fmt.Printf("Package name => %s\n", packageName)

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

	if err != nil {
		fmt.Printf("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]
	fmt.Printf("For version(%s) with tag(%s), versionData => %+v\n", version, tag, versionData)

	// Rewrite the tarball path
	tarballFileName := strings.Split(versionData.Dist.Tarball, "/-/")[1]
	fmt.Printf("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))
	fmt.Printf("versionData.Dist.Tarball => %s\n", versionData.Dist.Tarball)
	registryPath, _ := storage.GetRegistryPath()
	tarBallFile := strings.Split(tarballFileName, "/")[1]
	packageFilePath := path.Join(registryPath, packageName, tarBallFile)

	// Try to get the index.json from the store
	fileToServe, found, err := storage.GetIndexJsonFromStore(packageName)
	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)
		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 {
			fmt.Printf("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
	}

	fmt.Println("FiletoServe ==> ", fileToServe)

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

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