/*
GoCheese -- Python private package repository and caching proxy
Copyright (C) 2019-2021 Sergey Matveev <stargrave@stargrave.org>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package main

import (
	"bytes"
	_ "embed"
	"html/template"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"sort"
	"strings"
)

var (
	//go:embed hr-root.tmpl
	HRRootTmplRaw string
	HRRootTmpl    = template.Must(template.New("hr-root").Parse(HRRootTmplRaw))

	//go:embed hr-pkg.tmpl
	HRPkgTmplRaw string
	HRPkgTmpl    = template.Must(template.New("hr-pkg").Parse(HRPkgTmplRaw))
)

func serveHRRoot(w http.ResponseWriter, r *http.Request) {
	files, err := ioutil.ReadDir(Root)
	if err != nil {
		log.Println("error", r.RemoteAddr, "hr-root", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	packages := make([]string, 0, len(files))
	for _, f := range files {
		packages = append(packages, f.Name())
	}
	sort.Strings(packages)
	var buf bytes.Buffer
	err = HRRootTmpl.Execute(&buf, struct {
		Version  string
		Packages []string
	}{
		Version:  UserAgent,
		Packages: packages,
	})
	if err != nil {
		log.Println("error", r.RemoteAddr, "hr-root", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.Write(buf.Bytes())
}

func serveHRPkg(w http.ResponseWriter, r *http.Request) {
	cols := strings.Split(strings.TrimRight(r.URL.Path, "/"), "/")
	pkgName := cols[len(cols)-1]
	meta, releases, err := getMD(pkgName, "")
	if err != nil {
		if os.IsNotExist(err) {
			http.NotFound(w, r)
		} else {
			log.Println("error", r.RemoteAddr, "json", pkgName, err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
		return
	}
	var buf bytes.Buffer
	err = HRPkgTmpl.Execute(&buf, struct {
		Version  string
		PkgName  string
		Info     PkgInfo
		Releases []*PkgReleaseInfo
	}{
		Version:  UserAgent,
		PkgName:  pkgName,
		Info:     meta.Info,
		Releases: releases,
	})
	if err != nil {
		log.Println("error", r.RemoteAddr, "root", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.Write(buf.Bytes())
}