package handlers

import (
	"net/http"

	"git.haelnorr.com/h/golib/hws"
	"git.haelnorr.com/h/oslstats/internal/config"
	"git.haelnorr.com/h/oslstats/internal/discord"
	"git.haelnorr.com/h/oslstats/pkg/oauth"
)

func Login(server *hws.Server, cfg *config.Config) http.Handler {
	return http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			state, uak, err := oauth.GenerateState(cfg.OAuth, "login")
			if err != nil {
				err = server.ThrowError(w, r, hws.HWSError{
					StatusCode:      http.StatusInternalServerError,
					Message:         "Failed to generate state token",
					Error:           err,
					Level:           hws.ErrorLevel("error"),
					RenderErrorPage: true,
				})
				if err != nil {
					server.ThrowFatal(w, err)
				}
				return
			}
			oauth.SetStateCookie(w, uak, cfg.HWSAuth.SSL)

			link, err := discord.GetOAuthLink(cfg.Discord, state, cfg.HWSAuth.TrustedHost)
			if err != nil {
				err = server.ThrowError(w, r, hws.HWSError{
					StatusCode:      http.StatusInternalServerError,
					Message:         "An error occured trying to generate the login link",
					Error:           err,
					Level:           hws.ErrorLevel("error"),
					RenderErrorPage: true,
				})
				if err != nil {
					server.ThrowFatal(w, err)
				}
				return
			}
			http.Redirect(w, r, link, http.StatusSeeOther)
		},
	)
}