package main

import (
	"encoding/json"
	"log"
	"net/http"
	"path"
	"text/template"

	"github.com/allegro/bigcache/v3"
)

var cache *bigcache.BigCache

func setCache(key string, entry any) error {
	data, err := json.Marshal(&entry)
	if err != nil {
		return err
	}

	return cache.Set(key, data)
}

func getCache(key string) (any, error) {
	data, err := cache.Get(key)
	if err != nil {
		return nil, err
	}

	var decoded any

	if err = json.Unmarshal(data, &decoded); err != nil {
		return nil, err
	}

	return decoded, nil
}

func fatal(err any) {
	log.Fatalf("[ERR] %s\n", err)
}

func info(s string) {
	log.Printf("[INFO] %s\n", s)
}

func write(w http.ResponseWriter, status int, data []byte) {
	w.WriteHeader(status)
	w.Write(data)
}

func securityHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		csp := "default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' images.genius.com; object-src 'none'"
		w.Header().Add("content-security-policy", csp)
		w.Header().Add("referrer-policy", "no-referrer")
		w.Header().Add("x-content-type-options", "nosniff")
		next.ServeHTTP(w, r)
	})
}

func render(w http.ResponseWriter, data any) {
	t, err := template.ParseFiles(path.Join("views/lyrics.tmpl"))
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	if err = t.Execute(w, data); err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
}