package main

//go:generate make pack

import (
	"bytes"
	"errors"
	"fmt"
	"os"

	"github.com/Luzifer/rconfig"
	log "github.com/sirupsen/logrus"
)

var (
	cfg = struct {
		BaseURL        string `flag:"base-url" default:"" description:"URL to prepend before filename"`
		BasePath       string `flag:"base-path" default:"file/{{ printf \"%.2s\" .Hash }}/{{.Hash}}" description:"Path to upload the file to"`
		Bootstrap      bool   `flag:"bootstrap" default:"false" description:"Upload frontend files into bucket"`
		Bucket         string `flag:"bucket" default:"" description:"S3 bucket to upload files to" validate:"nonzero"`
		Listen         string `flag:"listen" default:"" description:"Enable HTTP server if set to IP/Port (e.g. ':3000')"`
		VersionAndExit bool   `flag:"version" default:"false" description:"Prints current version and exits"`
	}{}

	version = "dev"
)

func init() {
	if err := rconfig.ParseAndValidate(&cfg); err != nil {
		log.Fatalf("Unable to parse commandline options: %s", err)
	}

	if cfg.VersionAndExit {
		fmt.Printf("share %s\n", version)
		os.Exit(0)
	}
}

func main() {
	switch {

	case cfg.Bootstrap:
		if err := doBootstrap(); err != nil {
			log.WithError(err).Fatal("Bootstrap failed")
		}
		log.Info("Bucket bootstrap finished: Frontend uploaded")

	case cfg.Listen != "":
		if err := doListen(); err != nil {
			log.WithError(err).Fatal("HTTP server ended unclean")
		}

	default:
		if err := doCLIUpload(); err != nil {
			log.WithError(err).Fatal("Upload failed")
		}

	}
}

func doCLIUpload() error {
	if len(rconfig.Args()) == 1 {
		return errors.New("Missing argument: File to upload")
	}

	if cfg.BaseURL == "" {
		log.Warn("No BaseURL configured, output will be no complete URL")
	}

	inFileName := rconfig.Args()[1]
	inFileHandle, err := os.Open(inFileName)
	if err != nil {
		return fmt.Errorf("Unable to open source file: %s", err)
	}
	defer inFileHandle.Close()

	url, err := executeUpload(inFileName, inFileHandle, true)
	if err != nil {
		return fmt.Errorf("Unable to upload file: %s", err)
	}

	fmt.Println(url)
	return nil
}

func doBootstrap() error {
	for _, asset := range []string{"index.html", "app.js"} {
		if _, err := executeUpload(asset, bytes.NewReader(MustAsset("frontend/"+asset)), false); err != nil {
			return fmt.Errorf("Unable to upload bootstrap asset %q: %s", asset, err)
		}
	}
	return nil
}