package repository

import (
	"sync"
	"testing"
	"time"

	"job-cheng-xing/model"
)

func strPtr(s string) *string { return &s }

func TestMemoryRepo_CreateAndFind(t *testing.T) {
	repo := NewMemoryRepo()
	order := &model.Order{
		ID:          "ord_001",
		Status:      model.StatusPending,
		ServiceTime: time.Now(),
		Duration:    120,
		Address:     "北京朝阳",
		CreatedAt:   time.Now(),
		UpdatedAt:   time.Now(),
	}

	err := repo.Create(order)
	if err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	found, err := repo.FindByID("ord_001")
	if err != nil {
		t.Fatalf("FindByID failed: %v", err)
	}
	if found.ID != "ord_001" {
		t.Errorf("expected ord_001, got %s", found.ID)
	}
}

func TestMemoryRepo_FindByID_NotFound(t *testing.T) {
	repo := NewMemoryRepo()
	_, err := repo.FindByID("nonexistent")
	if err != model.ErrNotFound {
		t.Errorf("expected ErrNotFound, got %v", err)
	}
}

func TestMemoryRepo_Update_CAS_Success(t *testing.T) {
	repo := NewMemoryRepo()
	order := &model.Order{
		ID:          "ord_001",
		Status:      model.StatusPending,
		ServiceTime: time.Now(),
		Duration:    120,
		Address:     "北京朝阳",
		CreatedAt:   time.Now(),
		UpdatedAt:   time.Now(),
	}
	repo.Create(order)

	newOrder := &model.Order{
		Status:     model.StatusAccepted,
		ProviderID: strPtr("prov_001"),
		UpdatedAt:  time.Now(),
	}
	err := repo.Update("ord_001", model.StatusPending, newOrder)
	if err != nil {
		t.Fatalf("Update failed: %v", err)
	}

	found, _ := repo.FindByID("ord_001")
	if found.Status != model.StatusAccepted {
		t.Errorf("expected accepted, got %s", found.Status)
	}
	if *found.ProviderID != "prov_001" {
		t.Errorf("expected prov_001, got %s", *found.ProviderID)
	}
}

func TestMemoryRepo_Update_CAS_Fail_WrongStatus(t *testing.T) {
	repo := NewMemoryRepo()
	order := &model.Order{
		ID:     "ord_001",
		Status: model.StatusPending,
	}
	repo.Create(order)

	newOrder := &model.Order{Status: model.StatusCanceled}
	err := repo.Update("ord_001", model.StatusAccepted, newOrder)
	if err != model.ErrStatusConflict {
		t.Errorf("expected ErrStatusConflict, got %v", err)
	}
}

func TestMemoryRepo_ConcurrentAccept(t *testing.T) {
	repo := NewMemoryRepo()
	order := &model.Order{
		ID:          "ord_001",
		Status:      model.StatusPending,
		ServiceTime: time.Now(),
		Duration:    120,
		Address:     "北京朝阳",
		CreatedAt:   time.Now(),
		UpdatedAt:   time.Now(),
	}
	repo.Create(order)

	const numGoroutines = 50
	var wg sync.WaitGroup
	results := make(chan error, numGoroutines)

	for i := 0; i < numGoroutines; i++ {
		wg.Add(1)
		go func(idx int) {
			defer wg.Done()
			pid := "prov_" + string(rune('a'+idx%26)) + string(rune('0'+idx/26))
			newOrder := &model.Order{
				Status:     model.StatusAccepted,
				ProviderID: &pid,
				UpdatedAt:  time.Now(),
			}
			results <- repo.Update("ord_001", model.StatusPending, newOrder)
		}(i)
	}
	wg.Wait()
	close(results)

	successCount := 0
	failCount := 0
	for err := range results {
		if err == nil {
			successCount++
		} else if err == model.ErrStatusConflict {
			failCount++
		} else {
			t.Errorf("unexpected error: %v", err)
		}
	}

	if successCount != 1 {
		t.Errorf("expected exactly 1 success, got %d", successCount)
	}
	if failCount != numGoroutines-1 {
		t.Errorf("expected %d failures, got %d", numGoroutines-1, failCount)
	}

	found, _ := repo.FindByID("ord_001")
	if found.ProviderID == nil {
		t.Fatal("expected ProviderID to be set")
	}
	t.Logf("winner provider: %s", *found.ProviderID)
}