package main

import (
	"fmt"
	"html/template"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	"git.send.nrw/sendnrw/b1tsblog/internal/article"
)

func getenv(k, d string) string {
	if v := os.Getenv(k); v != "" {
		return v
	}
	return d
}

func enabled(k string, def bool) bool {
	b, err := strconv.ParseBool(strings.ToLower(os.Getenv(k)))
	if err != nil {
		return def
	}
	return b
}

func cacheControl(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
		next.ServeHTTP(w, r)
	})
}

var (
	tplList    *template.Template
	tplArticle *template.Template
)

func main() {

	// --- Verzeichnisse konfigurierbar machen -------------------------
	contentDir := os.Getenv("BLOG_CONTENT_DIR")
	if contentDir == "" {
		contentDir = "/content" // Fallback für local run
	}

	staticDir := os.Getenv("BLOG_STATIC_DIR")
	if staticDir == "" {
		staticDir = "/app/internal/web/static"
	}

	pagesDir := os.Getenv("BLOG_PAGES_DIR")
	if staticDir == "" {
		staticDir = "/pages"
	}

	funcs := template.FuncMap{
		"now": time.Now, // jetzt‑Zeit bereitstellen
	}

	// Basislayout zuerst parsen
	layout := template.Must(
		template.New("base").Funcs(funcs).
			ParseFiles("/app/internal/web/templates/base.html"),
	)

	// LIST‑Seite:   base + list.html
	tplList = template.Must(layout.Clone())
	template.Must(tplList.Funcs(funcs).ParseFiles("/app/internal/web/templates/list.html"))

	// ARTICLE‑Instanz
	tplArticle = template.Must(layout.Clone())
	template.Must(tplArticle.Funcs(funcs).ParseFiles("/app/internal/web/templates/article.html"))

	tplPage := template.Must(layout.Clone())
	template.Must(tplPage.ParseFiles("/app/internal/web/templates/page.html"))

	mux := http.NewServeMux()

	articles, err := article.LoadDir(contentDir)
	if err != nil {
		fmt.Println(err)
	}

	staticPages, err := article.LoadStatic(pagesDir)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Println(staticPages)
	}

	// Handler für /
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/" {
			http.NotFound(w, r)
			return
		}
		if err := tplList.ExecuteTemplate(w, "layout", articles); err != nil {
			http.Error(w, err.Error(), 500)
		}
	})

	mux.HandleFunc("/post/", func(w http.ResponseWriter, r *http.Request) {
		slug := strings.TrimPrefix(r.URL.Path, "/post/")
		for _, a := range articles {
			if a.Slug == slug {
				if err := tplArticle.ExecuteTemplate(w, "layout", a); err != nil {
					http.Error(w, err.Error(), 500)
				}
				return
			}
		}
		http.NotFound(w, r)
	})

	mux.HandleFunc("/page/", func(w http.ResponseWriter, r *http.Request) {
		slug := strings.TrimPrefix(r.URL.Path, "/page/")
		p, ok := staticPages[slug]
		if !ok {
			http.NotFound(w, r)
			return
		}
		// "layout" kommt aus deinem Template‑Pool (list/article nutzen es ja auch)
		if err := tplPage.ExecuteTemplate(w, "page", p); err != nil {
			http.Error(w, err.Error(), 500)
		}
	})

	mux.Handle("/static/",
		cacheControl(http.StripPrefix("/static/",
			http.FileServer(http.Dir(staticDir)))))

	http.ListenAndServe(":8080", mux)
}