package store

import (
	"context"
	"testing"

	"gcy_hpc_server/internal/model"

	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

func setupBlobTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	if err := db.AutoMigrate(&model.FileBlob{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}
	return db
}

func TestBlobStore_Create(t *testing.T) {
	db := setupBlobTestDB(t)
	store := NewBlobStore(db)
	ctx := context.Background()

	blob := &model.FileBlob{
		SHA256:   "abc123",
		MinioKey: "files/abc123",
		FileSize: 1024,
		MimeType: "application/octet-stream",
		RefCount: 0,
	}
	if err := store.Create(ctx, blob); err != nil {
		t.Fatalf("Create() error = %v", err)
	}
	if blob.ID == 0 {
		t.Error("Create() did not set ID")
	}
}

func TestBlobStore_GetBySHA256(t *testing.T) {
	db := setupBlobTestDB(t)
	store := NewBlobStore(db)
	ctx := context.Background()

	store.Create(ctx, &model.FileBlob{SHA256: "abc", MinioKey: "files/abc", FileSize: 100, RefCount: 0})

	blob, err := store.GetBySHA256(ctx, "abc")
	if err != nil {
		t.Fatalf("GetBySHA256() error = %v", err)
	}
	if blob == nil {
		t.Fatal("GetBySHA256() returned nil")
	}
	if blob.SHA256 != "abc" {
		t.Errorf("SHA256 = %q, want %q", blob.SHA256, "abc")
	}
	if blob.RefCount != 0 {
		t.Errorf("RefCount = %d, want 0", blob.RefCount)
	}
}

func TestBlobStore_GetBySHA256_NotFound(t *testing.T) {
	db := setupBlobTestDB(t)
	store := NewBlobStore(db)
	ctx := context.Background()

	blob, err := store.GetBySHA256(ctx, "nonexistent")
	if err != nil {
		t.Fatalf("GetBySHA256() error = %v", err)
	}
	if blob != nil {
		t.Error("GetBySHA256() should return nil for not found")
	}
}

func TestBlobStore_IncrementDecrementRef(t *testing.T) {
	db := setupBlobTestDB(t)
	store := NewBlobStore(db)
	ctx := context.Background()

	store.Create(ctx, &model.FileBlob{SHA256: "abc", MinioKey: "files/abc", FileSize: 100, RefCount: 0})

	if err := store.IncrementRef(ctx, "abc"); err != nil {
		t.Fatalf("IncrementRef() error = %v", err)
	}
	blob, _ := store.GetBySHA256(ctx, "abc")
	if blob.RefCount != 1 {
		t.Errorf("RefCount after 1st increment = %d, want 1", blob.RefCount)
	}

	store.IncrementRef(ctx, "abc")
	blob, _ = store.GetBySHA256(ctx, "abc")
	if blob.RefCount != 2 {
		t.Errorf("RefCount after 2nd increment = %d, want 2", blob.RefCount)
	}

	refCount, err := store.DecrementRef(ctx, "abc")
	if err != nil {
		t.Fatalf("DecrementRef() error = %v", err)
	}
	if refCount != 1 {
		t.Errorf("DecrementRef() returned %d, want 1", refCount)
	}

	refCount, _ = store.DecrementRef(ctx, "abc")
	if refCount != 0 {
		t.Errorf("DecrementRef() returned %d, want 0", refCount)
	}
}

func TestBlobStore_Delete(t *testing.T) {
	db := setupBlobTestDB(t)
	store := NewBlobStore(db)
	ctx := context.Background()

	store.Create(ctx, &model.FileBlob{SHA256: "abc", MinioKey: "files/abc", FileSize: 100, RefCount: 0})

	if err := store.Delete(ctx, "abc"); err != nil {
		t.Fatalf("Delete() error = %v", err)
	}

	blob, _ := store.GetBySHA256(ctx, "abc")
	if blob != nil {
		t.Error("Delete() did not remove blob")
	}
}

func TestBlobStore_SHA256_UniqueConstraint(t *testing.T) {
	db := setupBlobTestDB(t)
	store := NewBlobStore(db)
	ctx := context.Background()

	store.Create(ctx, &model.FileBlob{SHA256: "dup", MinioKey: "files/dup1", FileSize: 100})
	err := store.Create(ctx, &model.FileBlob{SHA256: "dup", MinioKey: "files/dup2", FileSize: 200})
	if err == nil {
		t.Error("expected error for duplicate SHA256, got nil")
	}
}