package help

import (
	"testing"
	"unicode/utf8"

	"github.com/bwmarrin/discordgo"
)

// Discord refuses an embed that is over its limits, and then /help would send
// nothing. This catches it when a command is added to the text.
func TestHelpFitsDiscordsLimits(t *testing.T) {
	list := embeds(&discordgo.MessageEmbedAuthor{Name: "Velox Bot"})
	if len(list) == 0 {
		t.Fatal("no help")
	}
	seen := 0
	for n, e := range list {
		total := utf8.RuneCountInString(e.Title) + utf8.RuneCountInString(e.Description)
		if len(e.Fields) > 25 {
			t.Errorf("embed %d has %d fields, at most 25", n, len(e.Fields))
		}
		for _, f := range e.Fields {
			seen++
			if l := utf8.RuneCountInString(f.Value); l == 0 || l > maxFieldChars {
				t.Errorf("field %q has %d characters, must be 1 to %d", f.Name, l, maxFieldChars)
			}
			if l := utf8.RuneCountInString(f.Name); l == 0 || l > 256 {
				t.Errorf("field name %q has %d characters, at most 256", f.Name, l)
			}
			total += fieldSize(f)
		}
		if total > 6000 {
			t.Errorf("embed %d has %d characters, Discord allows 6000", n, total)
		}
	}
	if seen != len(fields()) {
		t.Errorf("%d fields shown of %d", seen, len(fields()))
	}
}

// The help is meant to be wide and short: inline fields, so Discord puts
// three side by side, and it should fit in one message.
func TestHelpIsCompactAndInline(t *testing.T) {
	if n := len(embeds(&discordgo.MessageEmbedAuthor{Name: "Velox Bot"})); n != 1 {
		t.Errorf("the help should fit in one message, it takes %d", n)
	}
	inline := 0
	for _, f := range fields() {
		if f.Inline {
			inline++
		}
	}
	if inline < len(fields())-2 {
		t.Errorf("only %d of %d fields are inline", inline, len(fields()))
	}
}