package main

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

	"arimelody.me/arimelody.me/api/v1/admin"
	"arimelody.me/arimelody.me/api/v1/music"
	"arimelody.me/arimelody.me/global"
)

const DEFAULT_PORT int = 8080

func main() {
    db := InitDatabase()
    defer db.Close()
    
    var err error
    music.Artists, err = PullAllArtists(db)
    if err != nil {
        fmt.Printf("Failed to pull artists from database: %v\n", err);
        panic(1)
    }
    music.Releases, err = PullAllReleases(db)
    if err != nil {
        fmt.Printf("Failed to pull releases from database: %v\n", err);
        panic(1)
    }

    mux := http.NewServeMux()
    
    mux.Handle("/api/v1/admin/", global.HTTPLog(http.StripPrefix("/api/v1/admin", admin.Handler())))

    mux.Handle("/music/", global.HTTPLog(http.StripPrefix("/music", musicGatewayHandler())))
    mux.Handle("/music", global.HTTPLog(serveTemplate("music.html", music.Releases)))

    mux.Handle("/", global.HTTPLog(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        if r.URL.Path == "/" || r.URL.Path == "/index.html" {
            serveTemplate("index.html", nil).ServeHTTP(w, r)
            return
        }
        staticHandler().ServeHTTP(w, r)
    })))

    port := DEFAULT_PORT
    fmt.Printf("now serving at http://127.0.0.1:%d\n", port)
    log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), mux))
}

func staticHandler() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        info, err := os.Stat(filepath.Join("public", filepath.Clean(r.URL.Path)))
        // does the file exist?
        if err != nil {
            if os.IsNotExist(err) {
                http.NotFound(w, r)
                return
            }
        }

        // is thjs a directory? (forbidden)
        if info.IsDir() {
            http.NotFound(w, r)
            return
        }

        http.FileServer(http.Dir("./public")).ServeHTTP(w, r)
    })
}

func musicGatewayHandler() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        id := r.URL.Path[1:]
        release, err := music.GetRelease(id)
        if err != nil {
            http.NotFound(w, r)
            return
        }

        lrw := global.LoggingResponseWriter{w, http.StatusOK}

        serveTemplate("music-gateway.html", release).ServeHTTP(&lrw, r)

        if lrw.Code != http.StatusOK {
            fmt.Printf("Error loading music gateway for %s\n", id)
            return
        }
    })
}

func serveTemplate(page string, data any) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        lp_layout :=    filepath.Join("views", "layout.html")
        lp_header :=    filepath.Join("views", "header.html")
        lp_footer :=    filepath.Join("views", "footer.html")
        lp_prideflag := filepath.Join("views", "prideflag.html")
        fp :=           filepath.Join("views", filepath.Clean(page))

        info, err := os.Stat(fp)
        if err != nil {
            if os.IsNotExist(err) {
                http.NotFound(w, r)
                return
            }
        }

        if info.IsDir() {
            http.NotFound(w, r)
            return
        }

        template, err := template.ParseFiles(lp_layout, lp_header, lp_footer, lp_prideflag, fp)
        if err != nil {
            fmt.Printf("Error parsing template files: %s\n", err)
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
            return
        }

        err = template.ExecuteTemplate(w, "layout.html", data)
        if err != nil {
            fmt.Printf("Error executing template: %s\n", err)
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
            return
        }
    })
}