// The HTTP package handles serving up web pages from the page interface
// This package assumes you'll be changing directory to where the
// Website's static content, templates and includes are located
package http

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

	"riedstra.dev/mitch/go-website/local"
	"riedstra.dev/mitch/go-website/page"

	"github.com/gorilla/mux"
)

// NewPage is required to specify how we acquire a new page from a given URL
// since an interface is used, you can swap this out with a different
// library to load pages from different sources
var NewPage func(string) page.Page = func(u string) page.Page {
	return local.NewPage(u)
}

// ReindexRedirectTo is the path that we'll redirect to when a call to rebuild
// index is called
var ReindexRedirectTo = "/fullIndex"

// Logger can be overridden, errors and access logging are combined.
var Logger = log.New(os.Stderr, "", log.LstdFlags)

// GetHandler Returns a gorilla/mux Router which implements the http.Handler
// interface, allowing you to pull this website into your other Go applications
func GetHandler() *mux.Router {
	if NewPage == nil {
		fmt.Fprintln(os.Stderr, "Warning, global NewPage method is not defined!")
	}

	r := mux.NewRouter()
	r.HandleFunc("/rebuildIndex/", RebuildIndexHandler)
	r.PathPrefix("/static/").Handler(StaticHandler())
	r.PathPrefix("/").HandlerFunc(PageHandler)
	return r
}

// PageHandler is usually not called directly from external handlers, but the
// option exists if you're building something custom.
func PageHandler(w http.ResponseWriter, r *http.Request) {
	u := r.URL.Path
	if u == "/" {
		u = "/index"
	}
	u = filepath.Join(".", u)

	RenderForPath(w, r, u)
}

func RebuildIndexHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		p := NewPage("index")
		_ = p.RebuildIndex()
		http.Redirect(w, r, ReindexRedirectTo, 302)
	}
}

// StaticHandler simply returns a HTTP handler that looks at the current
// directory and exposes `static` via HTTP `/static`
func StaticHandler() http.Handler {
	return http.StripPrefix("/static/", http.FileServer(http.Dir("static")))
}