package admin

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

	"arimelody-web/admin/account"
	"arimelody-web/admin/auth"
	"arimelody-web/admin/core"
	"arimelody-web/admin/logs"
	"arimelody-web/admin/music"
	"arimelody-web/admin/templates"
	"arimelody-web/controller"
	"arimelody-web/model"
)

func Handler(app *model.AppState) http.Handler {
    mux := http.NewServeMux()

    mux.Handle("/register", auth.RegisterAccountHandler(app))
    mux.Handle("/login", auth.LoginHandler(app))
    mux.Handle("/totp", auth.LoginTOTPHandler(app))
    mux.Handle("/logout", core.RequireAccount(auth.LogoutHandler(app)))

    mux.Handle("/music/", core.RequireAccount(http.StripPrefix("/music", music.Handler(app))))
    mux.Handle("/logs", core.RequireAccount(logs.Handler(app)))
    mux.Handle("/account/", core.RequireAccount(http.StripPrefix("/account", account.Handler(app))))

    mux.Handle("/static/", http.StripPrefix("/static", staticHandler()))
    mux.Handle("/", core.RequireAccount(AdminIndexHandler(app)))

    // response wrapper to make sure a session cookie exists
    return core.EnforceSession(app, mux)
}

func AdminIndexHandler(app *model.AppState) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        if r.URL.Path != "/" {
            http.NotFound(w, r)
            return
        }

        session := r.Context().Value("session").(*model.Session)

        latestRelease, err := controller.GetLatestRelease(app.DB)
        if err != nil {
            fmt.Fprintf(os.Stderr, "WARN: Failed to pull latest release: %s\n", err)
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
            return
        }

        type IndexData struct {
            Session         *model.Session
            LatestRelease   *model.Release
        }

        err = templates.IndexTemplate.Execute(w, IndexData{
            Session: session,
            LatestRelease: latestRelease,
        })
        if err != nil {
            fmt.Fprintf(os.Stderr, "WARN: Failed to render admin index: %s\n", err)
            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
            return
        }
    })
}

func staticHandler() http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        info, err := os.Stat(filepath.Join("admin", "static", 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(filepath.Join("admin", "static"))).ServeHTTP(w, r)
    })
}