package saml

import (
	"fmt"
	"net/http"
	"time"

	"github.com/crewjam/saml"
	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v4"
	"github.com/google/uuid"
	"github.com/rs/zerolog/log"
	"go.sebtobie.de/httpserver/auth"
	"go.sebtobie.de/httpserver/constants"
)

var (
	defaccount = &account{
		data: map[constants.AccountConstant]any{
			constants.AccountID:   uuid.Nil,
			constants.AccountAnon: true,
		},
	}
	_ auth.AuthenticationHandler = &SAML{}
)

func maptoarray(m map[string]any) (output []any) {
	for k, v := range m {
		output = append(output, []any{k, v})
	}
	return
}

// Account returns the Account representation of the user
func (s *SAML) Account(c *gin.Context) auth.Account {
	acc := &(*defaccount)
	acc.s = s
	cookie, err := c.Cookie(s.Cookiename)
	if err != nil {
		return acc
	}
	var (
		claim *jwt.MapClaims
		ok    bool
	)
	token, err := jwt.ParseWithClaims(cookie, &jwt.MapClaims{}, s.signingkey)
	if err != nil {
		log.Debug().Err(err).Msg("Error while parsing token")
	}
	if claim, ok = token.Claims.(*jwt.MapClaims); ok && token.Valid {
		log.Debug().Interface("claim", claim).Msg("Got valid token")
		for key, value := range *claim {
			acc.data[constants.AccountConstant(key)] = value
		}
		return acc
	}
	log.Debug().Bool("valid", token.Valid).Interface("claim", claim).Msg("problem vith token")
	return acc
}

func (s *SAML) signingkey(token *jwt.Token) (key any, err error) {
	if _, ok := token.Method.(*jwt.SigningMethodRSAPSS); !ok {
		return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
	}
	return &s.jwtprivatekey.PublicKey, nil
}

type account struct {
	s    *SAML
	data map[constants.AccountConstant]any
}

func (a *account) Anonymous() bool {
	return a.data[constants.AccountAnon].(bool)
}

func (a *account) Redirect(c *gin.Context) {
	id := uuid.New().String()
	tokenstring, err := jwttoken(jwt.MapClaims{
		string(constants.AccountID):   id,
		string(constants.AccountAnon): true,
	}, a.s.jwtprivatekey)
	if err != nil {
		log.Error().Err(err).Msg("Failed to generate the token")
		c.AbortWithStatus(http.StatusInternalServerError)
		return
	}

	c.SetCookie(a.s.Cookiename, tokenstring, int(time.Hour), "", "", true, true)
	request, err := a.s.sp.MakeAuthenticationRequest(
		a.s.sp.GetSSOBindingLocation(saml.HTTPRedirectBinding),
		saml.HTTPRedirectBinding,
		saml.HTTPRedirectBinding,
	)
	if err != nil {
		c.AbortWithStatus(http.StatusInternalServerError)
	}
	request.ID = id
	u, err := request.Redirect(c.Request.URL.String(), a.s.sp)
	if err != nil {
		log.Error().Err(err).Msg("Failed to create redirect")
		c.AbortWithStatus(500)
		return
	}
	log.Debug().Msgf("Leite weiter: %s", u.String())
	c.Redirect(http.StatusSeeOther, u.String())
}

func (a *account) Get(key constants.AccountConstant) any {
	return a.data[key]
}

func (a *account) List() []constants.AccountConstant {
	var liste []constants.AccountConstant
	for key := range a.data {
		liste = append(liste, key)
	}
	return liste
}