package templates

import (
	"io/ioutil"
	"net/http"

	httperror "github.com/portainer/portainer/http/error"
	"github.com/portainer/portainer/http/request"
	"github.com/portainer/portainer/http/response"
)

// GET request on /api/templates?key=<key>
func (handler *Handler) templateList(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
	key, err := request.RetrieveQueryParameter(r, "key", false)
	if err != nil {
		return &httperror.HandlerError{http.StatusBadRequest, "Invalid query parameter: key", err}
	}

	templatesURL, templateErr := handler.retrieveTemplateURLFromKey(key)
	if templateErr != nil {
		return templateErr
	}

	resp, err := http.Get(templatesURL)
	if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve templates via the network", err}
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to read template response", err}
	}

	return response.Bytes(w, body, "application/json")
}

func (handler *Handler) retrieveTemplateURLFromKey(key string) (string, *httperror.HandlerError) {
	switch key {
	case "containers":
		settings, err := handler.SettingsService.Settings()
		if err != nil {
			return "", &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve settings from the database", err}
		}
		return settings.TemplatesURL, nil
	case "linuxserver.io":
		return containerTemplatesURLLinuxServerIo, nil
	}
	return "", &httperror.HandlerError{http.StatusBadRequest, "Invalid value for query parameter: key. Value must be one of: containers or linuxserver.io", request.ErrInvalidQueryParameter}
}