package main

    import (
        "fmt"
        "html/template"
        "log"
        "net/http"
        "os"
        "path/filepath"
        "strings"
    )

    //Page title
    type Page struct {
        Title string
    }

    //------------------------------Global Variables-------------------------------------//
    //Compile templates on start
    var templ = ParseTemplates()

    //ParseTemplates use for multi directory html parsing
    func ParseTemplates() *template.Template {
        t := template.New("Base")
        err := filepath.Walk("./", func(path string, info os.FileInfo, err error) error {
            if strings.Contains(path, ".html") {
                _, err = t.ParseFiles(path)
                fmt.Println(path)
                if err != nil {
                    logger.Println(err)
                    fmt.Println(err)
                }
            }

            return err
        })

        if err != nil {
            panic(err)
        }

        return t
    }

    //logging
    var errorlog *os.File
    var logger *log.Logger

    //---------------------------------------Page Handlers----------------------------------//
    //Handler for homepage
    func homepageHandler(w http.ResponseWriter, r *http.Request) {
        fmt.Println("Home")
        err := templ.ExecuteTemplate(w, "index", &Page{Title: "Welcome to TL;DR"})
        if err != nil {
            fmt.Println(err)
            logger.Println(err)
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    }

    //Handler for about page
    func aboutHandler(w http.ResponseWriter, r *http.Request) {
        fmt.Println("About")
        err := templ.ExecuteTemplate(w, "about", &Page{Title: "About TL;DR"})
        if err != nil {
            fmt.Println(err)
            logger.Println(err)
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    }

    //Server log to file
    func init() {
        errorlog, err := os.OpenFile("serverlog.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
        if err != nil {
            fmt.Printf("Error opening file: %v", err)
            os.Exit(1)
        }
        log.SetOutput(errorlog)
        logger = log.New(errorlog, "rnTDLR : ", log.Lshortfile|log.LstdFlags)
    }

    func main() {
        //--------------------------------------Routers-------------------------------------//
        http.HandleFunc("/", homepageHandler)
        http.HandleFunc("/index", homepageHandler)
        http.HandleFunc("/about", aboutHandler)

        http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
        //---------------------------------------------------------------------------------//
        //start server
        fmt.Println("Starting server on port 9090")
        logger.Println("Starting server on port 9090")
        logger.Fatal(http.ListenAndServe(":9090", nil))

    }