// Package main ...
package main

import (
	"fmt"
	"io"
	"log"
	"mime"
	"net/http"
	"os"
	"path"
	"strings"

	"git.mills.io/prologic/pages-server/gitea"
)

// GiteaHandler ...
type GiteaHandler struct {
	Client *gitea.Client

	Server     string
	Domain     string
	Token      string
	DomainsMap map[string]string
}

// Init ...
func (h *GiteaHandler) Init() error {
	var err error
	h.Client, err = gitea.NewClient(h.Server, h.Token, h.Domain)

	return err
}

// ServeHTTP ...
func (h *GiteaHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// use domain from the map
	if mapped, ok := h.DomainsMap[r.Host]; ok {
		r.Host = mapped
	}
	// remove the domain if it's set (works fine if it's empty)
	user := strings.TrimRight(strings.TrimSuffix(r.Host, h.Domain), ".")
	log.Printf("user: %s", user)

	f, err := h.Client.Open(user, r.URL.Path)
	if err != nil {
		http.Error(w, fmt.Sprintf("error resource not found: %s", err.Error()), http.StatusNotFound)
		return
	}

	extension := path.Ext(r.URL.Path)
	mimeType := mime.TypeByExtension(extension)
	w.Header().Add("content-type", mimeType)

	if _, err := io.Copy(w, f); err != nil {
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
	}
}

func main() {
	domainsMap := map[string]string{}
	items := strings.Split(os.Getenv("DOMAINS_MAP"), ";")
	for _, item := range items {
		itemParts := strings.Split(item, ":")
		if len(itemParts) == 2 {
			domainsMap[itemParts[0]] = itemParts[1]
		}
	}
	handler := &GiteaHandler{
		Domain:     os.Getenv("DOMAIN"),
		Server:     os.Getenv("GITEA_URL"),
		Token:      os.Getenv("GITEA_TOKEN"),
		DomainsMap: domainsMap,
	}
	if err := handler.Init(); err != nil {
		log.Fatalf("error initializing handler: %s", err)
	}

	if err := http.ListenAndServe("0.0.0.0:8000", handler); err != nil {
		log.Fatalf("error running server: %s", err)
	}
}