/*
Copyright The Helm Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package registry // import "helm.sh/helm/v3/internal/experimental/registry"

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"strings"

	"github.com/sirupsen/logrus"
	orascontext "oras.land/oras-go/pkg/context"
	"oras.land/oras-go/pkg/registry"

	"helm.sh/helm/v3/pkg/chart"
	"helm.sh/helm/v3/pkg/chart/loader"
)

// IsOCI determines whether or not a URL is to be treated as an OCI URL
func IsOCI(url string) bool {
	return strings.HasPrefix(url, fmt.Sprintf("%s://", OCIScheme))
}

// extractChartMeta is used to extract a chart metadata from a byte array
func extractChartMeta(chartData []byte) (*chart.Metadata, error) {
	ch, err := loader.LoadArchive(bytes.NewReader(chartData))
	if err != nil {
		return nil, err
	}
	return ch.Metadata, nil
}

// ctx retrieves a fresh context.
// disable verbose logging coming from ORAS (unless debug is enabled)
func ctx(out io.Writer, debug bool) context.Context {
	if !debug {
		return orascontext.Background()
	}
	ctx := orascontext.WithLoggerFromWriter(context.Background(), out)
	orascontext.GetLogger(ctx).Logger.SetLevel(logrus.DebugLevel)
	return ctx
}

// parseReference will parse and validate the reference, and clean tags when applicable
// 	tags are only cleaned when plus (+) signs are present, and are converted to underscores (_) before pushing
// 	See https://github.com/helm/helm/issues/10166
func parseReference(raw string) (registry.Reference, error) {
	// The sole possible reference modification is replacing plus (+) signs present in tags with underscores (_)
	// 	To do this properly, we first need to identify a tag, and then pass it on to the reference parser
	// 	NOTE: Passing immediately to the reference parser will fail since (+) signs are an invalid tag character, and
	// 		  simply replacing all plus (+) occurances could invalidate other portions of the URI
	parts := strings.Split(raw, ":")
	if len(parts) > 1 && !strings.Contains(parts[len(parts)-1], "/") {
		tag := parts[len(parts)-1]

		if tag != "" {
			// Replace any plus (+) signs with known underscore (_) conversion
			newTag := strings.ReplaceAll(tag, "+", "_")
			raw = strings.ReplaceAll(raw, tag, newTag)
		}
	}

	return registry.ParseReference(raw)
}