// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package folio

import (
	"decl/internal/transport"
	"decl/internal/data"
	"errors"
	"log/slog"
	"net/url"
)


var (
	ErrInvalidResourceURI error = errors.New("Invalid resource URI")
)

type ContentReader interface {
	ContentReaderStream() (*transport.Reader, error)
}

type ContentWriter interface {
	ContentWriterStream() (*transport.Writer, error)
}

type ContentReadWriter interface {
	ContentReader
	ContentWriter
}

type ResourceReference URI

// Return a Content ReadWriter for the resource referred to.
func (r ResourceReference) Lookup(look data.ResourceMapper) ContentReadWriter {
	if string(r) == "" {
		return nil
	}
	slog.Info("ResourceReference.Lookup()", "resourcereference", r, "resourcemapper", look)
	if look != nil {
		if v,ok := look.Get(string(r)); ok {
			return v.Resource().(ContentReadWriter)
		}
	}
	return r
}

func (r ResourceReference) Dereference(look data.ResourceMapper) data.Resource {
	slog.Info("ResourceReference.Dereference()", "resourcereference", r, "resourcemapper", look)
	if look != nil {
		if v,ok := look.Get(string(r)); ok {
			slog.Info("ResourceReference.Dereference()", "resourcereference", r, "result", v)
			return v.(*Declaration).Attributes
		}
	}
	return nil
}

func (r ResourceReference) Parse() *url.URL {
	return URI(r).Parse().URL()
}

func (r ResourceReference) Exists() bool {
	return URI(r).Exists()
}

func (r ResourceReference) ContentReaderStream() (*transport.Reader, error) {
	return URI(r).ContentReaderStream()
}

func (r ResourceReference) ContentWriterStream() (*transport.Writer, error) {
	return URI(r).ContentWriterStream()
}

func (r ResourceReference) IsEmpty() bool {
	return URI(r).IsEmpty()
}