package director

import (
	"forge.cadoles.com/Cadoles/go-proxy"
	"forge.cadoles.com/cadoles/bouncer/internal/store"
)

type Middleware interface {
	Middleware() proxy.Middleware
}

type RequestTransformer interface {
	RequestTransformer() proxy.RequestTransformer
}

type ResponseTransformer interface {
	ResponseTransformer() proxy.ResponseTransformer
}

type LayerRegistry struct {
	index map[store.LayerType]map[string]Layer
}

func (r *LayerRegistry) GetLayer(layerType store.LayerType, name string) (Layer, bool) {
	layers, exists := r.index[layerType]
	if !exists {
		return nil, false
	}

	layer, exists := layers[name]
	if !exists {
		return nil, false
	}

	return layer, true
}

func (r *LayerRegistry) getLayerAsAny(layerType store.LayerType, name string) (any, bool) {
	return r.GetLayer(layerType, name)
}

func (r *LayerRegistry) GetMiddleware(layerType store.LayerType, name string) (proxy.Middleware, bool) {
	layer, exists := r.getLayerAsAny(layerType, name)
	if !exists {
		return nil, false
	}

	middleware, ok := layer.(proxy.Middleware)
	if !ok {
		return nil, false
	}

	return middleware, true
}

func (r *LayerRegistry) GetResponseTransformer(layerType store.LayerType, name string) (proxy.ResponseTransformer, bool) {
	layer, exists := r.getLayerAsAny(layerType, name)
	if !exists {
		return nil, false
	}

	transformer, ok := layer.(proxy.ResponseTransformer)
	if !ok {
		return nil, false
	}

	return transformer, true
}

func (r *LayerRegistry) GetRequestTransformer(layerType store.LayerType, name string) (proxy.RequestTransformer, bool) {
	layer, exists := r.getLayerAsAny(layerType, name)
	if !exists {
		return nil, false
	}

	transformer, ok := layer.(proxy.RequestTransformer)
	if !ok {
		return nil, false
	}

	return transformer, true
}

func (r *LayerRegistry) Load(layers ...Layer) {
	index := make(map[store.LayerType]map[string]Layer)

	for _, l := range layers {
		layerType := l.LayerType()

		layers, exists := index[layerType]
		if !exists {
			layers = make(map[string]Layer)
		}

		layerName := l.LayerName()

		layers[layerName] = l
		index[layerType] = layers
	}

	r.index = index
}

func NewLayerRegistry(layers ...Layer) *LayerRegistry {
	registry := &LayerRegistry{
		index: make(map[store.LayerType]map[string]Layer),
	}
	registry.Load(layers...)

	return registry
}