package app

import (
	"context"
	"fmt"

	"gitea.maximumdirect.net/eric/distributor/internal/adapters/local"
	"gitea.maximumdirect.net/eric/distributor/internal/config"
	"gitea.maximumdirect.net/eric/distributor/internal/storage"
)

const storagePathKey = "path"

type backendFactory struct {
	registry *storage.Registry
}

func newBackendFactory() *backendFactory {
	registry := storage.NewRegistry()
	_ = registry.Register(config.BackendLocal, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
		if err := ctx.Err(); err != nil {
			return nil, err
		}
		return local.New(cfg[storagePathKey])
	})
	return &backendFactory{registry: registry}
}

func (f *backendFactory) openSource(ctx context.Context, source config.Backend) (storage.Backend, error) {
	if source.Backend != config.BackendLocal {
		return nil, fmt.Errorf("source backend %s is not implemented for execution", source.Backend)
	}
	return f.registry.Open(ctx, source.Backend, storage.OpenConfig{storagePathKey: source.Path})
}

func (f *backendFactory) openDestination(ctx context.Context, destination config.Destination) (storage.Backend, error) {
	if destination.Backend != config.BackendLocal {
		return nil, fmt.Errorf("backend %s is not implemented for execution", destination.Backend)
	}
	return f.registry.Open(ctx, destination.Backend, storage.OpenConfig{storagePathKey: destination.Path})
}

func (f *backendFactory) openLocalPath(ctx context.Context, path string) (storage.Backend, error) {
	return f.registry.Open(ctx, config.BackendLocal, storage.OpenConfig{storagePathKey: path})
}