// Copyright 2018 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package server

import (
	"context"
	"github.com/gofrs/uuid"
	"github.com/heroiclabs/nakama-common/api"
	"github.com/jackc/pgx"
	"go.uber.org/zap"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/types/known/emptypb"
)

func (s *ApiServer) GetAccount(ctx context.Context, in *emptypb.Empty) (*api.Account, error) {
	userID := ctx.Value(ctxUserIDKey{}).(uuid.UUID)

	// Before hook.
	if fn := s.runtime.BeforeGetAccount(); fn != nil {
		beforeFn := func(clientIP, clientPort string) error {
			err, code := fn(ctx, s.logger, userID.String(), ctx.Value(ctxUsernameKey{}).(string), ctx.Value(ctxVarsKey{}).(map[string]string), ctx.Value(ctxExpiryKey{}).(int64), clientIP, clientPort)
			if err != nil {
				return status.Error(code, err.Error())
			}
			// Empty input never overridden.
			return nil
		}

		// Execute the before function lambda wrapped in a trace for stats measurement.
		err := traceApiBefore(ctx, s.logger, s.metrics, ctx.Value(ctxFullMethodKey{}).(string), beforeFn)
		if err != nil {
			return nil, err
		}
	}

	account, err := GetAccount(ctx, s.logger, s.db, s.tracker, userID)
	if err != nil {
		if err == ErrAccountNotFound {
			return nil, status.Error(codes.NotFound, "Account not found.")
		}
		return nil, status.Error(codes.Internal, "Error retrieving user account.")
	}

	// User-facing account retrieval does not expose disable time for now.
	account.DisableTime = nil

	// After hook.
	if fn := s.runtime.AfterGetAccount(); fn != nil {
		afterFn := func(clientIP, clientPort string) error {
			return fn(ctx, s.logger, userID.String(), ctx.Value(ctxUsernameKey{}).(string), ctx.Value(ctxVarsKey{}).(map[string]string), ctx.Value(ctxExpiryKey{}).(int64), clientIP, clientPort, account)
		}

		// Execute the after function lambda wrapped in a trace for stats measurement.
		traceApiAfter(ctx, s.logger, s.metrics, ctx.Value(ctxFullMethodKey{}).(string), afterFn)
	}

	return account, nil
}

func (s *ApiServer) UpdateAccount(ctx context.Context, in *api.UpdateAccountRequest) (*emptypb.Empty, error) {
	userID := ctx.Value(ctxUserIDKey{}).(uuid.UUID)

	// Before hook.
	if fn := s.runtime.BeforeUpdateAccount(); fn != nil {
		beforeFn := func(clientIP, clientPort string) error {
			result, err, code := fn(ctx, s.logger, userID.String(), ctx.Value(ctxUsernameKey{}).(string), ctx.Value(ctxVarsKey{}).(map[string]string), ctx.Value(ctxExpiryKey{}).(int64), clientIP, clientPort, in)
			if err != nil {
				return status.Error(code, err.Error())
			}
			if result == nil {
				// If result is nil, requested resource is disabled.
				s.logger.Warn("Intercepted a disabled resource.", zap.Any("resource", ctx.Value(ctxFullMethodKey{}).(string)), zap.String("uid", userID.String()))
				return status.Error(codes.NotFound, "Requested resource was not found.")
			}
			in = result
			return nil
		}

		// Execute the before function lambda wrapped in a trace for stats measurement.
		err := traceApiBefore(ctx, s.logger, s.metrics, ctx.Value(ctxFullMethodKey{}).(string), beforeFn)
		if err != nil {
			return nil, err
		}
	}

	username := in.GetUsername().GetValue()
	if in.GetUsername() != nil {
		if len(username) < 1 || len(username) > 128 {
			return nil, status.Error(codes.InvalidArgument, "Username invalid, must be 1-128 bytes.")
		}
	}

	err := UpdateAccounts(ctx, s.logger, s.db, []*accountUpdate{{
		userID:      userID,
		username:    username,
		displayName: in.GetDisplayName(),
		timezone:    in.GetTimezone(),
		location:    in.GetLocation(),
		langTag:     in.GetLangTag(),
		avatarURL:   in.GetAvatarUrl(),
		metadata:    nil,
	}})
	if err != nil {
		if _, ok := err.(pgx.PgError); ok {
			return nil, status.Error(codes.Internal, "Error while trying to update account.")
		}
		return nil, status.Error(codes.InvalidArgument, err.Error())
	}

	// After hook.
	if fn := s.runtime.AfterUpdateAccount(); fn != nil {
		afterFn := func(clientIP, clientPort string) error {
			return fn(ctx, s.logger, userID.String(), ctx.Value(ctxUsernameKey{}).(string), ctx.Value(ctxVarsKey{}).(map[string]string), ctx.Value(ctxExpiryKey{}).(int64), clientIP, clientPort, in)
		}

		// Execute the after function lambda wrapped in a trace for stats measurement.
		traceApiAfter(ctx, s.logger, s.metrics, ctx.Value(ctxFullMethodKey{}).(string), afterFn)
	}

	return &emptypb.Empty{}, nil
}
