package main

import (
	"encoding/json"
	"fmt"
	"os"
	"slices"
	"strings"
	"testing"
)

// aLongGroup is members as JSON over 200 KB: 1666 paths of the shape of mesh-delivery #5's change (novox/hq issue 1272).
func aLongGroup(t *testing.T) string {
	t.Helper()
	var paths []string
	for i := 0; i < 1666; i++ {
		paths = append(paths, fmt.Sprintf("modules/mesh-delivery-forge-bridge/vendor/github.com/nats-io/nats-server/v2/server/certstore/certstore_windows_file_%04d.go", i))
	}
	body, err := json.Marshal([]map[string]any{{"id": "novox/mesh-delivery#5", "paths": paths}, {"id": "novox/mesh-catalog#374"}})
	if err != nil {
		t.Fatal(err)
	}
	if len(body) < 200<<10 {
		t.Fatalf("the members are only %d bytes", len(body))
	}
	return string(body)
}

func readBackFromTheCommand(t *testing.T, argv []string, members string) {
	t.Helper()
	for _, a := range argv {
		if len(a) > 64<<10 {
			t.Errorf("an argument of %d bytes is handed to the command", len(a))
		}
	}
	i := slices.Index(argv, "--members-file")
	if i < 0 {
		t.Fatalf("the command does not name a members file: %.200v", argv)
	}
	raw, err := os.ReadFile(argv[i+1])
	if err != nil || string(raw) != members {
		t.Errorf("the file does not hold the whole members list (%d bytes, %v)", len(raw), err)
	}
	removeMembersFile(argv)
	if _, err := os.Stat(argv[i+1]); !os.IsNotExist(err) {
		t.Errorf("the file is still there after the command: %v", err)
	}
}

func TestDeliveryOrderHandsALongMembersListInAFile(t *testing.T) { // 1272/AC2
	members := aLongGroup(t)
	argv, err := argvFor("delivery-order", map[string]any{"members": members})
	if err != nil {
		t.Fatal(err)
	}
	if argv[0] != "delivery" || argv[1] != "order" {
		t.Errorf("the command is %.100v", strings.Join(argv, " "))
	}
	readBackFromTheCommand(t, argv, members)
}

func TestAShortMembersListIsStillTheArgumentItWas(t *testing.T) { // 1272/AC3
	members := `[{"id":"novox/a#1"},{"id":"novox/b#2"}]`
	argv, err := argvFor("delivery-order", map[string]any{"members": members})
	want := []string{"delivery", "order", "--members", members}
	if err != nil || !slices.Equal(argv, want) {
		t.Errorf("a short list gives %v, %v, want %v", argv, err, want)
	}
}

func TestTheCommandReadsTheMembersFromTheFileAsFromTheArgument(t *testing.T) { // 1272/AC1
	members := `[{"id":"novox/a#1"}]`
	argv, _ := membersFlags(strings.Repeat(" ", membersInArgument) + members)
	defer removeMembersFile(argv)
	if len(argv) != 2 || argv[0] != "--members-file" {
		t.Fatalf("a long list gives %v", argv)
	}
	if st, err := os.Stat(argv[1]); err != nil || st.Mode().Perm() != 0o600 {
		t.Errorf("the file is %v, %v", st, err)
	}
}