// Command mesh-delivery-cli is the operator's command for the delivery view (novox/hq ADR 0429 §3). It asks the
// view's local socket for the rows and prints them; it holds no credential. `answer <ask key> <option> [words]` asks the view
// to write the operator's answer to an ask that needs no proof of who answered (the view refuses the merge's Approve).
package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"os"
	"strings"

	"mesh-delivery-view/internal/view"
)

const defaultSocket = "/var/lib/mesh-delivery-view-cli/cli.sock"

func main() {
	socket := os.Getenv("MESH_DELIVERY_SOCKET")
	if socket == "" {
		socket = defaultSocket
	}
	os.Exit(run(os.Args[1:], socket, os.Stdout, os.Stderr))
}

func run(args []string, socket string, out, errOut io.Writer) int {
	fs := flag.NewFlagSet("mesh-delivery-cli", flag.ContinueOnError)
	fs.SetOutput(errOut)
	asJSON := fs.Bool("json", false, "print the rows as JSON")
	if err := fs.Parse(args); err != nil {
		return 2
	}
	if fs.NArg() > 0 {
		if fs.Arg(0) != "answer" || fs.NArg() < 3 {
			fmt.Fprintln(errOut, "mesh-delivery-cli shows the rows, or answers: mesh-delivery-cli answer <ask key> <option> [words]")
			return 2
		}
		key, option := fs.Arg(1), fs.Arg(2)
		if err := view.AnswerAsk(socket, key, option, strings.Join(fs.Args()[3:], " ")); err != nil {
			fmt.Fprintln(errOut, "mesh-delivery-cli:", err)
			return 1
		}
		fmt.Fprintf(out, "answered %s with %s; the teller fills the ask from it\n", key, option)
		return 0
	}
	s, err := view.Ask(socket)
	if err != nil {
		fmt.Fprintln(errOut, "mesh-delivery-cli:", err)
		return 1
	}
	if *asJSON {
		enc := json.NewEncoder(out)
		enc.SetIndent("", "  ")
		if err := enc.Encode(s); err != nil {
			fmt.Fprintln(errOut, "mesh-delivery-cli:", err)
			return 1
		}
		return 0
	}
	view.Table(out, s)
	return 0
}