package pay

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strconv"
	"strings"

	"git.sr.ht/~sircmpwn/getopt"
)

func usage() {
	fmt.Fprintf(os.Stderr, "usage: %s pay [-h host] user amount\n", os.Args[0])
	os.Exit(1)
}

func Main(args []string) {
	host := "https://usualsuspect:freundschaft@kasse.z1.ccchb.de"

	getopt.Usage = usage
	opts, optind, err := getopt.Getopts(args, "h:")
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}
	for _, opt := range opts {
		switch opt.Option {
		case 'h':
			host = opt.Value
		}
	}

	if len(args) != optind+2 {
		usage()
	}
	args = args[optind:]
	user := args[0]
	amount, err := strconv.Atoi(args[1])
	if err != nil {
		fmt.Fprintf(os.Stderr, "%s: amount: %v\n", os.Args[0], err)
		os.Exit(1)
	}
	amount = -amount

	req := struct {
		Amount int `json:"amount"`
	}{amount}
	json, err := json.Marshal(req)
	if err != nil {
		fmt.Fprintf(os.Stderr, "%s: generating JSON: %v\n", os.Args[0], err)
		os.Exit(1)
	}
	// BUG: user is not URI encoded
	// BUG: user can’t be the name
	resp, err := http.Post(host+"/api/user/"+user+"/transaction", "application/json", strings.NewReader(string(json)))
	if err != nil {
		fmt.Fprintf(os.Stderr, "%s: HTTP: %v\n", os.Args[0], err)
		os.Exit(1)
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		fmt.Fprintf(os.Stderr, "%s: unexpected status code: %d\n", os.Args[0], resp.StatusCode)
		io.Copy(os.Stderr, resp.Body)
	}
}