package storage

import (
	"context"
	"fmt"
	"strings"

	"gitea.maximumdirect.net/eric/narratio/internal/config"
)

// NewObjectStoreFromConfig constructs a remote object store from resolved config.
func NewObjectStoreFromConfig(ctx context.Context, cfg *config.Config) (ObjectStore, error) {
	if cfg == nil || cfg.Pipeline == nil {
		return nil, fmt.Errorf("pipeline config is required")
	}

	switch strings.ToLower(strings.TrimSpace(cfg.Pipeline.Storage.Backend)) {
	case config.StorageBackendS3:
		if cfg.Pipeline.Storage.S3 == nil {
			return nil, fmt.Errorf("pipeline.storage.s3 is required when pipeline.storage.backend is s3")
		}
		return NewS3BackendFromConfig(ctx, *cfg.Pipeline.Storage.S3)
	case "", config.StorageBackendLocal:
		return nil, fmt.Errorf("no remote object store backend is configured")
	default:
		return nil, fmt.Errorf("unsupported pipeline.storage.backend %q", cfg.Pipeline.Storage.Backend)
	}
}