package handler

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

	"github.com/gorilla/mux"
	"github.com/sirupsen/logrus"
	"golang.org/x/mod/semver"
)

func DistTagDelete(lg *logrus.Logger) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		escapedName := mux.Vars(r)["name"]
		packageName, _ := url.PathUnescape(escapedName)
		lg.Printf("Package name => %s\n", packageName)

		escapedName = mux.Vars(r)["tag"]
		tag, _ := url.PathUnescape(escapedName)
		lg.Printf("Tag => %s\n", tag)

		if semver.IsValid(tag) {
			http.Error(w, "Tag cannot be a semver version", http.StatusBadRequest)
			return
		}

		if tag == "latest" {
			http.Error(w, "Cannot delete the latest tag", http.StatusBadRequest)
			return
		}

		fileToServe, found, err := storage.GetIndexJsonFromStore(packageName)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if !found {
			ret := fmt.Sprintf("Package not found: %s", packageName)
			http.Error(w, ret, http.StatusNotFound)
			return
		}

		var jsonFile serviceidos.IndexJson
		err = storage.ReadIndexJson(fileToServe, &jsonFile)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		delete(jsonFile.DistTags, tag)

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

		distTagsString, _ := json.Marshal(jsonFile.DistTags)

		response := serviceidos.TagPutResponse{
			Ok:       true,
			ID:       escapedName,
			DistTags: string(distTagsString),
		}

		jsonString, _ := json.Marshal(response)

		w.Header().Set("Content-Type", "application/json")
		w.Header().Set("Content-Length", strconv.Itoa(len(jsonString)))
		w.Write(jsonString)
	}
}