package main

import (
	"log"
	"net/http"
	"os"
	"path/filepath"

	"opds-explorer/internal/handlers"
	"opds-explorer/internal/proxy"
)

func main() {
	proxyClient := proxy.NewClient()
	h := handlers.New(proxyClient)

	mux := http.NewServeMux()

	// API: fetch OPDS feed (proxies request, returns parsed + raw)
	mux.HandleFunc("GET /api/fetch", h.FetchFeed)
	mux.HandleFunc("POST /api/fetch", h.FetchFeed)
	// API: stream a URL through the server (e.g. for images to avoid CORS)
	mux.HandleFunc("GET /api/proxy", h.ProxyResource)

	// Serve Vue SPA from dist (or embedded)
	dist := os.Getenv("OPDS_DIST")
	if dist == "" {
		dist = filepath.Join(".", "dist")
	}
	if info, err := os.Stat(dist); err == nil && info.IsDir() {
		mux.Handle("/", http.FileServer(http.Dir(dist)))
	} else {
		// Dev: serve a simple message if dist missing
		mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
			if r.URL.Path != "/" {
				http.NotFound(w, r)
				return
			}
			w.Header().Set("Content-Type", "text/html; charset=utf-8")
			w.Write([]byte(`<h1>OPDS-PS Explorer</h1><p>Build the Vue app: <code>cd webapp && bun run build</code>, then run the server from repo root.</p>`))
		})
	}

	addr := ":8080"
	if p := os.Getenv("PORT"); p != "" {
		addr = ":" + p
	}
	log.Printf("OPDS-PS Explorer server listening on %s", addr)
	if err := http.ListenAndServe(addr, cors(mux)); err != nil {
		log.Fatal(err)
	}
}

func cors(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusNoContent)
			return
		}
		next.ServeHTTP(w, r)
	})
}