package mocks

import (
	"context"
	"fmt"
	"io"
	"time"

	"Noooste/garage-ui/internal/models"
	"Noooste/garage-ui/internal/services"
)

// s3NotConfigured mirrors errNotConfigured but keys messages on S3Mock so
// failures from unset S3 methods are distinguishable from unset admin methods.
func s3NotConfigured(method string) error {
	return fmt.Errorf("S3Mock.%s: not configured by test", method)
}

// Compile-time guarantee that S3Mock satisfies services.S3Storage.
var _ services.S3Storage = (*S3Mock)(nil)

// S3Mock is a hand-rolled mock of services.S3Storage. Tests assign the
// per-method function fields they care about; unset methods return
// s3NotConfigured.
type S3Mock struct {
	ListObjectsFn           func(ctx context.Context, bucketName, prefix string, maxKeys int, continuationToken string) (*models.ObjectListResponse, error)
	SearchObjectsFn         func(ctx context.Context, bucketName, prefix, search string) (*models.ObjectListResponse, error)
	UploadObjectFn          func(ctx context.Context, bucketName, key string, body io.Reader, contentType string) (*models.ObjectUploadResponse, error)
	CreateDirectoryMarkerFn func(ctx context.Context, bucketName, key string) (*models.ObjectUploadResponse, error)
	GetObjectFn             func(ctx context.Context, bucketName, key string) (io.ReadCloser, *models.ObjectInfo, error)
	GetObjectRangeFn        func(ctx context.Context, bucketName, key string, start, end int64) (io.ReadCloser, error)
	ObjectExistsFn          func(ctx context.Context, bucketName, key string) (bool, error)
	DeleteObjectFn          func(ctx context.Context, bucketName, key string) error
	GetObjectMetadataFn     func(ctx context.Context, bucketName, key string) (*models.ObjectInfo, error)
	GetPresignedURLFn       func(ctx context.Context, bucketName, key string, expiresIn time.Duration) (string, error)
	DeleteMultipleObjectsFn func(ctx context.Context, bucketName string, keys []string) (int, error)
	DeleteObjectsByPrefixFn func(ctx context.Context, bucketName, prefix string) (int, error)
	UploadMultipleObjectsFn func(ctx context.Context, bucketName string, files []struct {
		Key         string
		Body        io.Reader
		ContentType string
	}) []services.UploadResult

	// Calls records every invocation in order. Shares the Call type with
	// AdminMock via the same package.
	Calls []Call
}

func (m *S3Mock) record(method string, args ...any) {
	m.Calls = append(m.Calls, Call{Method: method, Args: args})
}

func (m *S3Mock) ListObjects(ctx context.Context, bucketName, prefix string, maxKeys int, continuationToken string) (*models.ObjectListResponse, error) {
	m.record("ListObjects", bucketName, prefix, maxKeys, continuationToken)
	if m.ListObjectsFn == nil {
		return nil, s3NotConfigured("ListObjects")
	}
	return m.ListObjectsFn(ctx, bucketName, prefix, maxKeys, continuationToken)
}

func (m *S3Mock) SearchObjects(ctx context.Context, bucketName, prefix, search string) (*models.ObjectListResponse, error) {
	m.record("SearchObjects", bucketName, prefix, search)
	if m.SearchObjectsFn == nil {
		return nil, s3NotConfigured("SearchObjects")
	}
	return m.SearchObjectsFn(ctx, bucketName, prefix, search)
}

func (m *S3Mock) UploadObject(ctx context.Context, bucketName, key string, body io.Reader, contentType string) (*models.ObjectUploadResponse, error) {
	m.record("UploadObject", bucketName, key, contentType)
	if m.UploadObjectFn == nil {
		return nil, s3NotConfigured("UploadObject")
	}
	return m.UploadObjectFn(ctx, bucketName, key, body, contentType)
}

func (m *S3Mock) CreateDirectoryMarker(ctx context.Context, bucketName, key string) (*models.ObjectUploadResponse, error) {
	m.record("CreateDirectoryMarker", bucketName, key)
	if m.CreateDirectoryMarkerFn == nil {
		return nil, s3NotConfigured("CreateDirectoryMarker")
	}
	return m.CreateDirectoryMarkerFn(ctx, bucketName, key)
}

func (m *S3Mock) GetObject(ctx context.Context, bucketName, key string) (io.ReadCloser, *models.ObjectInfo, error) {
	m.record("GetObject", bucketName, key)
	if m.GetObjectFn == nil {
		return nil, nil, s3NotConfigured("GetObject")
	}
	return m.GetObjectFn(ctx, bucketName, key)
}

func (m *S3Mock) GetObjectRange(ctx context.Context, bucketName, key string, start, end int64) (io.ReadCloser, error) {
	m.record("GetObjectRange", bucketName, key)
	if m.GetObjectRangeFn == nil {
		return nil, s3NotConfigured("GetObjectRange")
	}
	return m.GetObjectRangeFn(ctx, bucketName, key, start, end)
}

func (m *S3Mock) ObjectExists(ctx context.Context, bucketName, key string) (bool, error) {
	m.record("ObjectExists", bucketName, key)
	if m.ObjectExistsFn == nil {
		return false, s3NotConfigured("ObjectExists")
	}
	return m.ObjectExistsFn(ctx, bucketName, key)
}

func (m *S3Mock) DeleteObject(ctx context.Context, bucketName, key string) error {
	m.record("DeleteObject", bucketName, key)
	if m.DeleteObjectFn == nil {
		return s3NotConfigured("DeleteObject")
	}
	return m.DeleteObjectFn(ctx, bucketName, key)
}

func (m *S3Mock) GetObjectMetadata(ctx context.Context, bucketName, key string) (*models.ObjectInfo, error) {
	m.record("GetObjectMetadata", bucketName, key)
	if m.GetObjectMetadataFn == nil {
		return nil, s3NotConfigured("GetObjectMetadata")
	}
	return m.GetObjectMetadataFn(ctx, bucketName, key)
}

func (m *S3Mock) GetPresignedURL(ctx context.Context, bucketName, key string, expiresIn time.Duration) (string, error) {
	m.record("GetPresignedURL", bucketName, key, expiresIn)
	if m.GetPresignedURLFn == nil {
		return "", s3NotConfigured("GetPresignedURL")
	}
	return m.GetPresignedURLFn(ctx, bucketName, key, expiresIn)
}

func (m *S3Mock) DeleteMultipleObjects(ctx context.Context, bucketName string, keys []string) (int, error) {
	m.record("DeleteMultipleObjects", bucketName, keys)
	if m.DeleteMultipleObjectsFn == nil {
		return 0, s3NotConfigured("DeleteMultipleObjects")
	}
	return m.DeleteMultipleObjectsFn(ctx, bucketName, keys)
}

func (m *S3Mock) DeleteObjectsByPrefix(ctx context.Context, bucketName, prefix string) (int, error) {
	m.record("DeleteObjectsByPrefix", bucketName, prefix)
	if m.DeleteObjectsByPrefixFn == nil {
		return 0, s3NotConfigured("DeleteObjectsByPrefix")
	}
	return m.DeleteObjectsByPrefixFn(ctx, bucketName, prefix)
}

func (m *S3Mock) UploadMultipleObjects(ctx context.Context, bucketName string, files []struct {
	Key         string
	Body        io.Reader
	ContentType string
}) []services.UploadResult {
	m.record("UploadMultipleObjects", bucketName, len(files))
	if m.UploadMultipleObjectsFn == nil {
		// Can't return an error here — the interface has no error channel.
		// Return a single synthetic failure for every file so tests that
		// forget to configure this method see a clear red flag.
		results := make([]services.UploadResult, len(files))
		for i, f := range files {
			results[i] = services.UploadResult{
				Key:     f.Key,
				Success: false,
				Error:   s3NotConfigured("UploadMultipleObjects"),
			}
		}
		return results
	}
	return m.UploadMultipleObjectsFn(ctx, bucketName, files)
}