package quizzes_test

import (
	"context"
	"errors"
	"slices"
	"testing"

	"git.golem15.com/golem15/sm-quizzes-plugin/graders"
	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/party"
)

// fixtureGrader is the grader both fixture plugins publish, under the same
// code.
type fixtureGrader struct{}

func (fixtureGrader) Code() string  { return "fixture" }
func (fixtureGrader) Label() string { return "Fixture" }
func (fixtureGrader) Grade(context.Context, graders.Input) (graders.Result, error) {
	return graders.Result{}, nil
}

// graderPlugin is a test-only plugin that provides fixtureGrader. It is
// registered here and activated only by the tests that name it.
type graderPlugin struct{ id string }

func (p *graderPlugin) ID() string                    { return p.id }
func (p *graderPlugin) Requires() []string            { return []string{"golem15.quizzes"} }
func (p *graderPlugin) Register(*backpack.App) error  { return nil }
func (p *graderPlugin) Boot(*backpack.App) error      { return nil }
func (p *graderPlugin) QuizGraders() []graders.Grader { return []graders.Grader{fixtureGrader{}} }

func init() {
	party.Register(&graderPlugin{id: "acme.gradersone"})
	party.Register(&graderPlugin{id: "acme.graderstwo"})
}

func TestGradersCollectedAtBoot(t *testing.T) {
	app := backpack.New(testConfig(t))
	if _, err := party.Activate(app, []string{"golem15.user", "golem15.quizzes", "acme.gradersone"}); err != nil {
		t.Fatalf("Activate: %v", err)
	}
	reg, ok := app.Lookup[*graders.Registry]()
	if !ok || reg == nil {
		t.Fatal("no *graders.Registry published")
	}
	if got := reg.Codes(); !slices.Equal(got, []string{graders.Manual, "fixture"}) {
		t.Errorf("Codes = %v, want [manual fixture]", got)
	}
	if id, _ := reg.PluginID("fixture"); id != "acme.gradersone" {
		t.Errorf("PluginID(fixture) = %q", id)
	}

	plain, _ := activate(t, nil, nil)
	if reg, ok := plain.Lookup[*graders.Registry](); !ok || !slices.Equal(reg.Codes(), []string{graders.Manual}) {
		t.Errorf("without grading plugins the registry should hold manual only")
	}

	dup := backpack.New(testConfig(t))
	_, err := party.Activate(dup, []string{"golem15.user", "golem15.quizzes", "acme.gradersone", "acme.graderstwo"})
	if !errors.Is(err, graders.ErrDuplicateCode) {
		t.Errorf("Activate with two fixture plugins = %v, want ErrDuplicateCode", err)
	}
}