package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"strings"
)

// RunAPI provides a basic REST API
func RunAPI(cfg *config) {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		log.Debug(fmt.Sprintf("Web: %s", r.URL.Path))
		if r.URL.Path != "/" {
			log.Debug("Web 404")
			http.NotFound(w, r)
			return
		}
		pageTemplate, err := Asset("assets/index.html")
		if err != nil {
			log.Fatal(fmt.Sprintf("Error with HTTP server template asset: %s", err.Error()))
		}
		fmt.Fprintf(w, string(pageTemplate))
	})
	http.HandleFunc("/assets/", webStaticHandler)
	if cfg.API.TLS {
		log.Notice(fmt.Sprintf("Starting HTTPS server on %s", cfg.API.Listen))
		err := http.ListenAndServeTLS(cfg.API.Listen, cfg.API.Cert, cfg.API.Key, nil)
		if err != nil {
			log.Fatal(fmt.Sprintf("Error starting HTTPS server: %s", err.Error()))
		}
	} else {
		log.Notice(fmt.Sprintf("Starting HTTP server on %s", cfg.API.Listen))
		err := http.ListenAndServe(cfg.API.Listen, nil)
		if err != nil {
			log.Fatal(fmt.Sprintf("Error starting HTTP server: %s", err.Error()))
		}
	}
}

// webStaticHandler serves embedded static web files (js&css)
func webStaticHandler(w http.ResponseWriter, r *http.Request) {
	assetPath := r.URL.Path[1:]
	staticAsset, err := Asset(assetPath)
	if err != nil {
		log.Error(err.Error())
		http.NotFound(w, r)
		return
	}
	headers := w.Header()
	if strings.HasSuffix(assetPath, ".js") {
		headers["Content-Type"] = []string{"application/javascript"}
	} else if strings.HasSuffix(assetPath, ".css") {
		headers["Content-Type"] = []string{"text/css"}
	}
	io.Copy(w, bytes.NewReader(staticAsset))
}

type stringer string

func (s stringer) String() string { return string(s) }