package oauth

import (
	"context"
	"git.0x7f.app/WOJ/woj-server/internal/misc/config"
	"git.0x7f.app/WOJ/woj-server/internal/misc/log"
	"git.0x7f.app/WOJ/woj-server/internal/repo/cache"
	"git.0x7f.app/WOJ/woj-server/internal/service/user"
	"git.0x7f.app/WOJ/woj-server/internal/web/jwt"
	"github.com/coreos/go-oidc/v3/oidc"
	"github.com/gin-gonic/gin"
	"github.com/samber/do"
	"go.uber.org/zap"
	"golang.org/x/oauth2"
	"time"
)

type Handler interface {
	LoginHandler() gin.HandlerFunc
	CallbackHandler() gin.HandlerFunc
}

const (
	oauthStateCookieName = "oauth_state"
	oauthStateKey        = "OAuthState:%s"
	oauthStateLiveness   = 15 * time.Minute
)

func RouteRegister(rg *gin.RouterGroup, i *do.Injector) {
	conf := do.MustInvoke[config.Service](i).GetConfig()
	if conf.WebServer.OAuth.Domain == "" {
		return
	}

	app := &handler{}
	app.log = do.MustInvoke[log.Service](i).GetLogger("oauth")
	app.jwt = do.MustInvoke[jwt.Service](i)
	app.user = do.MustInvoke[user.Service](i)
	app.cache = do.MustInvoke[cache.Service](i)

	var err error
	app.provider, err = oidc.NewProvider(context.Background(), conf.WebServer.OAuth.Domain)
	if err != nil {
		app.log.Error("failed to create oauth provider", zap.Error(err), zap.String("domain", conf.WebServer.OAuth.Domain))
		return
	}

	app.verifier = app.provider.Verifier(&oidc.Config{ClientID: conf.WebServer.OAuth.ClientID})

	app.conf = oauth2.Config{
		ClientID:     conf.WebServer.OAuth.ClientID,
		ClientSecret: conf.WebServer.OAuth.ClientSecret,
		RedirectURL:  conf.WebServer.PublicBase + rg.BasePath() + "/callback",
		Endpoint:     app.provider.Endpoint(),
		Scopes:       []string{oidc.ScopeOpenID, "profile", "email", "roles"},
	}

	rg.POST("/login", app.LoginHandler())
	rg.GET("/callback", app.CallbackHandler())
}

type handler struct {
	log   *zap.Logger
	jwt   jwt.Service
	user  user.Service
	cache cache.Service

	provider *oidc.Provider
	conf     oauth2.Config
	verifier *oidc.IDTokenVerifier
}