package main

import (
	"bytes"
	"net/http"
	"strings"
)

func healthcheck(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("ok"))
}

func reloadRules(c *Config) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		err := c.LoadMappingFile("")
		if err != nil {
			errorLog.Printf("Cannot reload rules: %+v", err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		w.Write([]byte("ok"))
	}
}

func serveRules(c *Config) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusInternalServerError)
			return
		}

		// if go-get param is absent, return nothing
		if r.FormValue("go-get") != "1" {
			w.Write(GetDefaultHtml())
			return
		}

		nameOfPkg := r.Host + r.URL.Path

		var vanityUrl, proto, repoUrl string
		for _, rule := range c.MappingRules.Mappings {
			if strings.HasPrefix(strings.ToLower(nameOfPkg), strings.ToLower(rule.VanityUrl+"/")) {
				repo := strings.Replace(strings.ToLower(nameOfPkg), strings.ToLower(rule.VanityUrl), "", -1)
				repo = strings.Split(repo, "/")[1]

				vanityUrl = rule.VanityUrl + "/" + repo
				repoUrl = rule.RealUrl + "/" + repo
				proto = rule.Protocol

				break
			}
		}

		d := ImportRuleStruct{
			VanityUrl: vanityUrl,
			Proto:     proto,
			RepoUrl:   repoUrl,
		}
		tmpl := GetServeHtml()

		var buf bytes.Buffer
		err := tmpl.Execute(&buf, &d)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		w.Header().Set("Cache-Control", "public, max-age=500")
		w.Write(buf.Bytes())
	}
}