//go:build unit

package worker

import (
	"context"
	"errors"
	"math/rand"
	"sync"
	"testing"

	"git.sr.ht/~gabrielgio/img/pkg/testkit"
)

type (
	mockCounterListProcessor struct {
		done    bool
		countTo int
		counter int
	}

	mockContextListProcessor struct {
	}
)

func TestListProcessorLimit(t *testing.T) {
	mock := &mockCounterListProcessor{
		countTo: 10000,
	}
	worker := NewWorkerFromListProcessor[int](mock, nil)

	err := worker.Start(context.Background())
	testkit.TestFatalError(t, "Start", err)

	testkit.TestValue(t, "Start", mock.countTo, mock.counter)
}

func TestListProcessorContextCancelQuery(t *testing.T) {
	mock := &mockContextListProcessor{}
	worker := NewWorkerFromListProcessor[int](mock, nil)

	ctx, cancel := context.WithCancel(context.Background())
	var wg sync.WaitGroup

	wg.Add(1)
	go func() {
		defer wg.Done()
		err := worker.Start(ctx)
		if errors.Is(err, context.Canceled) {
			return
		}
		testkit.TestFatalError(t, "Start", err)
	}()

	cancel()
	// this rely on timeout to test
	wg.Wait()
}

func (m *mockCounterListProcessor) Query(_ context.Context) ([]int, error) {
	if m.done {
		return make([]int, 0), nil
	}
	values := make([]int, 0, m.countTo)
	for i := 0; i < m.countTo; i++ {
		values = append(values, rand.Int())
	}

	m.done = true
	return values, nil
}

func (m *mockCounterListProcessor) Process(_ context.Context, _ int) error {
	m.counter++
	return nil
}

func (m *mockContextListProcessor) Query(_ context.Context) ([]int, error) {
	// keeps returning the query so it can run in infinity loop
	values := make([]int, 0, 10)
	for i := 0; i < 10; i++ {
		values = append(values, rand.Int())
	}
	return values, nil
}

func (m *mockContextListProcessor) Process(_ context.Context, _ int) error {
	// do nothing
	return nil
}