package ui

import (
	"io"
	"path/filepath"
)

var _ Resources = &PathResources{}

// PathResources implements Resources by adding a prefix to the requested source name before  proxying it to its source.
type PathResources struct {
	Source Resources
	Prefix string
}

// NewPathResources creates a new Resources by adding a prefix to the requested source name before  proxying it to its source. If source is nil it will use the OS file system for its resources.
func NewPathResources(source Resources, prefix string) *PathResources {
	if source == nil {
		source = &OSResources{}
	}
	return &PathResources{source, prefix}
}

// Destroy destroys the source.
func (r *PathResources) Destroy() error { return r.Source.Destroy() }

// OpenResource opens the resource with the prefixed name.
func (r *PathResources) OpenResource(name string) (io.ReadCloser, error) {
	path := filepath.Join(r.Prefix, name)
	return r.Source.OpenResource(path)
}

var _ PhysicalResources = &PathPhysicalResources{}

// PathPhysicalResources implements PhysicalResources by adding a prefix to the requested source name before  proxying it to its source.
type PathPhysicalResources struct {
	Source PhysicalResources
	Prefix string
}

// NewPathPhysicalResources creates a new PhysicalResources by adding a prefix to the requested source name before  proxying it to its source. If source is nil it will use the OS file system for its resources.
func NewPathPhysicalResources(source PhysicalResources, prefix string) *PathPhysicalResources {
	if source == nil {
		source = &OSResources{}
	}
	return &PathPhysicalResources{source, prefix}
}

// Destroy destroys the source.
func (r *PathPhysicalResources) Destroy() error { return r.Source.Destroy() }

// FetchResource fetches the resource with the prefixed name.
func (r *PathPhysicalResources) FetchResource(name string) (string, error) {
	path := filepath.Join(r.Prefix, name)
	return r.Source.FetchResource(path)
}

// OpenResource opens the resource with the prefixed name.
func (r *PathPhysicalResources) OpenResource(name string) (io.ReadCloser, error) {
	path := filepath.Join(r.Prefix, name)
	return r.Source.OpenResource(path)
}