package storage_test

import (
	"errors"
	"testing"

	"github.com/uopi/uopi/internal/storage"
)

const sampleXML = `<interface id="test-if" name="Test Interface" version="1"><widget/></interface>`

func newStore(t *testing.T) *storage.Store {
	t.Helper()
	s, err := storage.New(t.TempDir())
	if err != nil {
		t.Fatalf("New: %v", err)
	}
	return s
}

// -------------------------------------------------------------------------- //
// List                                                                         //
// -------------------------------------------------------------------------- //

func TestListEmpty(t *testing.T) {
	s := newStore(t)
	list, err := s.List()
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if len(list) != 0 {
		t.Errorf("expected empty list, got %d items", len(list))
	}
}

func TestListAfterCreate(t *testing.T) {
	s := newStore(t)
	if _, err := s.Create([]byte(sampleXML)); err != nil {
		t.Fatalf("Create: %v", err)
	}
	list, err := s.List()
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if len(list) != 1 {
		t.Fatalf("expected 1 item, got %d", len(list))
	}
	if list[0].Name != "Test Interface" {
		t.Errorf("Name = %q, want %q", list[0].Name, "Test Interface")
	}
	if list[0].Version != 1 {
		t.Errorf("Version = %d, want 1", list[0].Version)
	}
}

// -------------------------------------------------------------------------- //
// Create + Get                                                                 //
// -------------------------------------------------------------------------- //

func TestCreateAndGet(t *testing.T) {
	s := newStore(t)
	id, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("Create: %v", err)
	}
	if id == "" {
		t.Fatal("Create returned empty ID")
	}

	data, err := s.Get(id)
	if err != nil {
		t.Fatalf("Get(%q): %v", id, err)
	}
	if string(data) != sampleXML {
		t.Errorf("Get returned %q, want %q", data, sampleXML)
	}
}

func TestCreateUsesEmbeddedID(t *testing.T) {
	s := newStore(t)
	id, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("Create: %v", err)
	}
	// ID derived from xml id attr or name slug.
	if id == "" {
		t.Error("ID should not be empty")
	}
}

func TestCreateDuplicateGetsUniqueID(t *testing.T) {
	s := newStore(t)
	id1, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("first Create: %v", err)
	}
	id2, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("second Create: %v", err)
	}
	if id1 == id2 {
		t.Errorf("duplicate Create returned same ID %q", id1)
	}
}

func TestCreateInvalidXML(t *testing.T) {
	s := newStore(t)
	_, err := s.Create([]byte("not xml"))
	if err == nil {
		t.Error("expected error for invalid XML")
	}
}

// -------------------------------------------------------------------------- //
// Get errors                                                                   //
// -------------------------------------------------------------------------- //

func TestGetNotFound(t *testing.T) {
	s := newStore(t)
	_, err := s.Get("does-not-exist")
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Get missing: want ErrNotFound, got %v", err)
	}
}

func TestGetInvalidID(t *testing.T) {
	s := newStore(t)
	_, err := s.Get("../traversal")
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Get path-traversal ID: want ErrNotFound, got %v", err)
	}
}

func TestGetEmptyID(t *testing.T) {
	s := newStore(t)
	_, err := s.Get("")
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Get empty ID: want ErrNotFound, got %v", err)
	}
}

// -------------------------------------------------------------------------- //
// Update                                                                       //
// -------------------------------------------------------------------------- //

func TestUpdate(t *testing.T) {
	s := newStore(t)
	id, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	updated := `<interface id="test-if" name="Updated" version="2"><widget/></interface>`
	if err := s.Update(id, []byte(updated)); err != nil {
		t.Fatalf("Update: %v", err)
	}

	data, err := s.Get(id)
	if err != nil {
		t.Fatalf("Get after update: %v", err)
	}
	if string(data) != updated {
		t.Errorf("post-update content mismatch")
	}
}

func TestUpdateNotFound(t *testing.T) {
	s := newStore(t)
	err := s.Update("no-such-id", []byte(sampleXML))
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Update missing: want ErrNotFound, got %v", err)
	}
}

// -------------------------------------------------------------------------- //
// Delete                                                                       //
// -------------------------------------------------------------------------- //

func TestDelete(t *testing.T) {
	s := newStore(t)
	id, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("Create: %v", err)
	}
	if err := s.Delete(id); err != nil {
		t.Fatalf("Delete: %v", err)
	}
	_, err = s.Get(id)
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Get after delete: want ErrNotFound, got %v", err)
	}
}

func TestDeleteNotFound(t *testing.T) {
	s := newStore(t)
	err := s.Delete("ghost")
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Delete missing: want ErrNotFound, got %v", err)
	}
}

// -------------------------------------------------------------------------- //
// Clone                                                                        //
// -------------------------------------------------------------------------- //

func TestClone(t *testing.T) {
	s := newStore(t)
	id, err := s.Create([]byte(sampleXML))
	if err != nil {
		t.Fatalf("Create: %v", err)
	}
	newID, err := s.Clone(id)
	if err != nil {
		t.Fatalf("Clone: %v", err)
	}
	if newID == id {
		t.Error("Clone should produce a different ID")
	}
	orig, _ := s.Get(id)
	copy, _ := s.Get(newID)
	if string(orig) != string(copy) {
		t.Error("Clone content should match original")
	}
}

func TestCloneNotFound(t *testing.T) {
	s := newStore(t)
	_, err := s.Clone("ghost")
	if !errors.Is(err, storage.ErrNotFound) {
		t.Errorf("Clone missing: want ErrNotFound, got %v", err)
	}
}