package uiserver

import (
	"encoding/json"

	"github.com/hashicorp/consul/agent/config"
)

// uiTemplateDataFromConfig returns the base set of variables that should be
// injected into the UI's Env based on the given runtime UI config.
func uiTemplateDataFromConfig(cfg *config.RuntimeConfig) (map[string]interface{}, error) {

	uiCfg := map[string]interface{}{
		"metrics_provider": cfg.UIConfig.MetricsProvider,
		// We explicitly MUST NOT pass the metrics_proxy object since it might
		// contain add_headers with secrets that the UI shouldn't know e.g. API
		// tokens for the backend. The provider should either require the proxy to
		// be configured and then use that or hit the backend directly from the
		// browser.
		"metrics_proxy_enabled":   cfg.UIConfig.MetricsProxy.BaseURL != "",
		"dashboard_url_templates": cfg.UIConfig.DashboardURLTemplates,
	}

	// Only set this if there is some actual JSON or we'll cause a JSON
	// marshalling error later during serving which ends up being silent.
	if cfg.UIConfig.MetricsProviderOptionsJSON != "" {
		uiCfg["metrics_provider_options"] = json.RawMessage(cfg.UIConfig.MetricsProviderOptionsJSON)
	}

	d := map[string]interface{}{
		"ContentPath":       cfg.UIConfig.ContentPath,
		"ACLsEnabled":       cfg.ACLsEnabled,
		"UIConfig":          uiCfg,
		"LocalDatacenter":   cfg.Datacenter,
		"PrimaryDatacenter": cfg.PrimaryDatacenter,
	}

	// Also inject additional provider scripts if needed, otherwise strip the
	// comment.
	if len(cfg.UIConfig.MetricsProviderFiles) > 0 {
		d["ExtraScripts"] = []string{
			cfg.UIConfig.ContentPath + compiledProviderJSPath,
		}
	}

	return d, nil
}