package handlers

import (
	"database/sql"
	"errors"
	"fmt"
	"strings"

	"github.com/authelia/authelia/v4/internal/middlewares"
	"github.com/authelia/authelia/v4/internal/model"
	"github.com/authelia/authelia/v4/internal/utils"
)

// UserInfoPOST handles setting up info for users if necessary when they login.
func UserInfoPOST(ctx *middlewares.AutheliaCtx) {
	userSession := ctx.GetSession()

	var (
		userInfo model.UserInfo
		err      error
	)

	if _, err = ctx.Providers.StorageProvider.LoadPreferred2FAMethod(ctx, userSession.Username); err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			if err = ctx.Providers.StorageProvider.SavePreferred2FAMethod(ctx, userSession.Username, ""); err != nil {
				ctx.Error(fmt.Errorf("unable to load user information: %v", err), messageOperationFailed)
			}
		} else {
			ctx.Error(fmt.Errorf("unable to load user information: %v", err), messageOperationFailed)
		}
	}

	if userInfo, err = ctx.Providers.StorageProvider.LoadUserInfo(ctx, userSession.Username); err != nil {
		ctx.Error(fmt.Errorf("unable to load user information: %v", err), messageOperationFailed)
		return
	}

	var (
		changed bool
	)

	if changed = userInfo.SetDefaultPreferred2FAMethod(ctx.AvailableSecondFactorMethods()); changed {
		if err = ctx.Providers.StorageProvider.SavePreferred2FAMethod(ctx, userSession.Username, userInfo.Method); err != nil {
			ctx.Error(fmt.Errorf("unable to save user two factor method: %v", err), messageOperationFailed)
			return
		}
	}

	userInfo.DisplayName = userSession.DisplayName

	err = ctx.SetJSONBody(userInfo)
	if err != nil {
		ctx.Logger.Errorf("Unable to set user info response in body: %s", err)
	}
}

// UserInfoGET get the info related to the user identified by the session.
func UserInfoGET(ctx *middlewares.AutheliaCtx) {
	userSession := ctx.GetSession()

	userInfo, err := ctx.Providers.StorageProvider.LoadUserInfo(ctx, userSession.Username)
	if err != nil {
		ctx.Error(fmt.Errorf("unable to load user information: %v", err), messageOperationFailed)
		return
	}

	userInfo.DisplayName = userSession.DisplayName

	err = ctx.SetJSONBody(userInfo)
	if err != nil {
		ctx.Logger.Errorf("Unable to set user info response in body: %s", err)
	}
}

// MethodPreferencePost update the user preferences regarding 2FA method.
func MethodPreferencePost(ctx *middlewares.AutheliaCtx) {
	bodyJSON := preferred2FAMethodBody{}

	err := ctx.ParseBody(&bodyJSON)
	if err != nil {
		ctx.Error(err, messageOperationFailed)
		return
	}

	if !utils.IsStringInSlice(bodyJSON.Method, ctx.AvailableSecondFactorMethods()) {
		ctx.Error(fmt.Errorf("unknown or unavailable method '%s', it should be one of %s", bodyJSON.Method, strings.Join(ctx.AvailableSecondFactorMethods(), ", ")), messageOperationFailed)
		return
	}

	userSession := ctx.GetSession()
	ctx.Logger.Debugf("Save new preferred 2FA method of user %s to %s", userSession.Username, bodyJSON.Method)
	err = ctx.Providers.StorageProvider.SavePreferred2FAMethod(ctx, userSession.Username, bodyJSON.Method)

	if err != nil {
		ctx.Error(fmt.Errorf("unable to save new preferred 2FA method: %s", err), messageOperationFailed)
		return
	}

	ctx.ReplyOK()
}