package app

import (
	"context"
	"errors"
	"strings"
	"testing"
	"time"

	"github.com/geo-platform/tenant-api/internal/shared/objectstorage"
	"github.com/stretchr/testify/require"
)

func TestNormalizeOSSCommonPrefixesDerivesNextLevelFolders(t *testing.T) {
	t.Parallel()

	objects := []objectstorage.ObjectInfo{
		{Key: "reports/2026/report.txt"},
		{Key: "reports/2026/monthly/january.txt"},
		{Key: "reports/2025/summary.txt"},
		{Key: "reports/readme.txt"},
		{Key: "images/logo.png"},
	}

	require.Equal(t,
		[]string{"reports/2026/", "reports/2025/"},
		normalizeOSSCommonPrefixes("reports/", nil, objects, false),
	)
	require.Equal(t,
		[]objectstorage.ObjectInfo{{Key: "reports/readme.txt"}},
		normalizeOSSListedObjects("reports/", objects, false),
	)
}

func TestNormalizeOSSListedObjectsFiltersFolderPlaceholders(t *testing.T) {
	t.Parallel()

	objects := []objectstorage.ObjectInfo{
		{Key: "reports/"},
		{Key: "reports/readme.txt"},
		{Key: "reports/2026/"},
		{Key: "reports/2026/report.txt"},
	}

	require.Equal(t,
		[]objectstorage.ObjectInfo{{Key: "reports/readme.txt"}},
		normalizeOSSListedObjects("reports/", objects, false),
	)
	require.Equal(t,
		[]objectstorage.ObjectInfo{{Key: "reports/readme.txt"}, {Key: "reports/2026/report.txt"}},
		normalizeOSSListedObjects("reports/", objects, true),
	)
}

func TestNormalizeOSSCommonPrefixesKeepsProviderPrefixes(t *testing.T) {
	t.Parallel()

	got := normalizeOSSCommonPrefixes(
		"reports/",
		[]string{"reports/2026/", "reports/2025/"},
		[]objectstorage.ObjectInfo{
			{Key: "reports/2026/report.txt"},
			{Key: "reports/2025/summary.txt"},
		},
		false,
	)

	require.Equal(t, []string{"reports/2026/", "reports/2025/"}, got)
}

func TestNormalizeOSSCommonPrefixesOmitsFoldersInRecursiveMode(t *testing.T) {
	t.Parallel()

	got := normalizeOSSCommonPrefixes(
		"reports/",
		[]string{"reports/2026/"},
		[]objectstorage.ObjectInfo{{Key: "reports/2026/report.txt"}},
		true,
	)

	require.Empty(t, got)
}

func TestShouldFallbackOSSDirectoryList(t *testing.T) {
	t.Parallel()

	require.True(t, shouldFallbackOSSDirectoryList(
		ObjectStorageListInput{Prefix: "desktop-client/"},
		"",
		nil,
		nil,
	))
	require.False(t, shouldFallbackOSSDirectoryList(
		ObjectStorageListInput{Prefix: "desktop-client/", Recursive: true},
		"",
		nil,
		nil,
	))
	require.False(t, shouldFallbackOSSDirectoryList(
		ObjectStorageListInput{Prefix: "desktop-client/"},
		"release",
		nil,
		nil,
	))
	require.False(t, shouldFallbackOSSDirectoryList(
		ObjectStorageListInput{Prefix: "desktop-client/"},
		"",
		nil,
		[]string{"desktop-client/releases/"},
	))
}

func TestCreateFolderWritesPlaceholder(t *testing.T) {
	t.Parallel()

	storage := newFakeObjectStorage()
	svc := &ObjectStorageService{storage: storage}

	result, err := svc.CreateFolder(context.Background(), nil, ObjectStorageFolderCreateInput{Prefix: "reports/2026"})

	require.NoError(t, err)
	require.Equal(t, "reports/2026/", result.Prefix)
	require.Contains(t, storage.objects, "reports/2026/")
	require.Equal(t, []byte(nil), storage.objects["reports/2026/"])
	require.Equal(t, "application/octet-stream", storage.contentTypes["reports/2026/"])
}

func TestCreateFolderRejectsExistingPrefix(t *testing.T) {
	t.Parallel()

	storage := newFakeObjectStorage()
	storage.objects["reports/2026/report.txt"] = []byte("content")
	svc := &ObjectStorageService{storage: storage}

	_, err := svc.CreateFolder(context.Background(), nil, ObjectStorageFolderCreateInput{Prefix: "reports/2026/"})

	require.Error(t, err)
	require.Contains(t, err.Error(), "object_storage_folder_exists")
}

func TestDeleteFolderDeletesAllObjectsUnderPrefix(t *testing.T) {
	t.Parallel()

	storage := newFakeObjectStorage()
	storage.objects["reports/2026/"] = nil
	storage.objects["reports/2026/a.txt"] = []byte("a")
	storage.objects["reports/2026/nested/b.txt"] = []byte("b")
	storage.objects["reports/2025/a.txt"] = []byte("old")
	svc := &ObjectStorageService{storage: storage}

	result, err := svc.DeleteFolder(context.Background(), nil, "reports/2026/")

	require.NoError(t, err)
	require.Equal(t, "reports/2026/", result.Prefix)
	require.Equal(t, 3, result.DeletedCount)
	require.NotContains(t, storage.objects, "reports/2026/")
	require.NotContains(t, storage.objects, "reports/2026/a.txt")
	require.NotContains(t, storage.objects, "reports/2026/nested/b.txt")
	require.Contains(t, storage.objects, "reports/2025/a.txt")
}

func TestGetReturnsPreviewURLAndOmitsNonPublicURL(t *testing.T) {
	t.Parallel()

	storage := newFakeObjectStorage()
	storage.objects["reports/secret.png"] = []byte("image")
	storage.publicReadable = false
	svc := &ObjectStorageService{storage: storage}

	result, err := svc.Get(context.Background(), "reports/secret.png")

	require.NoError(t, err)
	require.Nil(t, result.PublicURL)
	require.NotNil(t, result.PreviewURL)
	require.Equal(t, "https://example.test/download/reports/secret.png", *result.PreviewURL)
}

type fakeObjectStorage struct {
	objects        map[string][]byte
	contentTypes   map[string]string
	publicReadable bool
}

func newFakeObjectStorage() *fakeObjectStorage {
	return &fakeObjectStorage{
		objects:        make(map[string][]byte),
		contentTypes:   make(map[string]string),
		publicReadable: true,
	}
}

func (s *fakeObjectStorage) Validate() error {
	return nil
}

func (s *fakeObjectStorage) PutBytes(_ context.Context, objectKey string, content []byte, contentType string) error {
	s.objects[objectKey] = content
	s.contentTypes[objectKey] = contentType
	return nil
}

func (s *fakeObjectStorage) GetBytes(_ context.Context, objectKey string) ([]byte, error) {
	content, ok := s.objects[objectKey]
	if !ok {
		return nil, objectstorage.ErrObjectNotFound
	}
	return content, nil
}

func (s *fakeObjectStorage) Exists(_ context.Context, objectKey string) (bool, error) {
	_, ok := s.objects[objectKey]
	return ok, nil
}

func (s *fakeObjectStorage) Delete(_ context.Context, objectKey string) error {
	delete(s.objects, objectKey)
	return nil
}

func (s *fakeObjectStorage) PublicURL(objectKey string) (string, error) {
	return "https://example.test/" + objectKey, nil
}

func (s *fakeObjectStorage) PublicReadableURL(objectKey string) (string, error) {
	if !s.publicReadable {
		return "", objectstorage.ErrObjectNotPublic
	}
	return "https://example.test/" + objectKey, nil
}

func (s *fakeObjectStorage) DownloadURL(objectKey string) (string, error) {
	return "https://example.test/download/" + objectKey, nil
}

func (s *fakeObjectStorage) List(_ context.Context, in objectstorage.ListInput) (*objectstorage.ListResult, error) {
	if in.Limit == 0 {
		return nil, errors.New("test list limit must be set")
	}
	result := &objectstorage.ListResult{}
	for key, content := range s.objects {
		if strings.HasPrefix(key, in.Prefix) {
			result.Objects = append(result.Objects, objectstorage.ObjectInfo{
				Key:          key,
				Size:         int64(len(content)),
				LastModified: time.Now(),
			})
		}
	}
	return result, nil
}

func (s *fakeObjectStorage) Stat(_ context.Context, objectKey string) (*objectstorage.ObjectInfo, error) {
	content, ok := s.objects[objectKey]
	if !ok {
		return nil, objectstorage.ErrObjectNotFound
	}
	return &objectstorage.ObjectInfo{Key: objectKey, Size: int64(len(content)), LastModified: time.Now()}, nil
}

func (s *fakeObjectStorage) Copy(_ context.Context, sourceKey, destinationKey string) error {
	content, ok := s.objects[sourceKey]
	if !ok {
		return objectstorage.ErrObjectNotFound
	}
	s.objects[destinationKey] = append([]byte(nil), content...)
	return nil
}