package objectstorage

import (
	"context"
	"errors"
	"fmt"
	"strings"

	"go.uber.org/zap"

	"github.com/geo-platform/tenant-api/internal/shared/config"
)

var ErrNotConfigured = errors.New("object storage is not configured")

type Client interface {
	Validate() error
	PutBytes(ctx context.Context, objectKey string, content []byte, contentType string) error
	GetBytes(ctx context.Context, objectKey string) ([]byte, error)
	Exists(ctx context.Context, objectKey string) (bool, error)
	Delete(ctx context.Context, objectKey string) error
	PublicURL(objectKey string) (string, error)
}

func New(cfg config.ObjectStorageConfig, logger *zap.Logger) Client {
	provider := strings.ToLower(strings.TrimSpace(cfg.Provider))
	switch provider {
	case "", "disabled":
		return disabledClient{reason: "object storage is disabled"}
	case "minio", "mino":
		return NewMinIOClient(cfg, logger)
	case "aliyun", "aliyun_oss", "aliyun-oss", "oss":
		return NewAliyunClient(cfg, logger)
	default:
		return disabledClient{reason: fmt.Sprintf("unsupported object storage provider %q", cfg.Provider)}
	}
}

type disabledClient struct {
	reason string
}

func (c disabledClient) Validate() error {
	if c.reason == "" {
		c.reason = "missing object storage configuration"
	}
	return fmt.Errorf("%w: %s", ErrNotConfigured, c.reason)
}

func (c disabledClient) PutBytes(context.Context, string, []byte, string) error {
	return c.Validate()
}

func (c disabledClient) GetBytes(context.Context, string) ([]byte, error) {
	return nil, c.Validate()
}

func (c disabledClient) Exists(context.Context, string) (bool, error) {
	return false, c.Validate()
}

func (c disabledClient) Delete(context.Context, string) error {
	return c.Validate()
}

func (c disabledClient) PublicURL(string) (string, error) {
	return "", c.Validate()
}