package main

import (
	"bytes"
	"context"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestDispatch_Help_PrintsUsageAndReturnsZero(t *testing.T) {
	var out, errBuf bytes.Buffer
	code := dispatch(context.Background(), []string{"--help"}, strings.NewReader(""), &out, &errBuf)
	assert.Equal(t, 0, code)
	assert.Contains(t, out.String(), "Usage: hyperguild")
	assert.Contains(t, out.String(), "tier")
	assert.Contains(t, out.String(), "brain")
	assert.Contains(t, out.String(), "mode")
}

func TestDispatch_NoArgs_PrintsUsageAndReturnsTwo(t *testing.T) {
	var out, errBuf bytes.Buffer
	code := dispatch(context.Background(), []string{}, strings.NewReader(""), &out, &errBuf)
	assert.Equal(t, 2, code)
	assert.Contains(t, errBuf.String(), "Usage: hyperguild")
}

func TestDispatch_UnknownSubcommand_ReturnsTwo(t *testing.T) {
	var out, errBuf bytes.Buffer
	code := dispatch(context.Background(), []string{"bogus"}, strings.NewReader(""), &out, &errBuf)
	assert.Equal(t, 2, code)
	assert.Contains(t, errBuf.String(), "unknown subcommand: bogus")
}

func TestDispatch_KnownSubcommand_RoutesToHandler(t *testing.T) {
	// "mode" without args fails → exit 1, message on stderr.
	// (Confirms dispatch reached the handler rather than printing "unknown
	// subcommand: mode".)
	var out, errBuf bytes.Buffer
	code := dispatch(context.Background(), []string{"mode"}, strings.NewReader(""), &out, &errBuf)
	assert.Equal(t, 1, code)
	assert.Contains(t, errBuf.String(), "name required")
	assert.NotContains(t, errBuf.String(), "unknown subcommand")
}