/*
ScheduleTogether Backend
Copyright (C) 2024, Zervó Zadachin

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License version 3 for more details.

This program incorporates external libraries for certain functionalities.
These libraries are covered by their respective licenses, and their usage
agreements are as outlined in their respective documentation or source
code.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package friends

import (
	"github.com/kataras/iris/v12"

	db "git.zervo.org/scheduletogether/backend/internal/database"
	"git.zervo.org/scheduletogether/backend/pkg/types"
)

func FriendsGetRequests_Service(ctx iris.Context, id uint) {
	// Make sure a userId was passed
	if id == 0 {
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "Something went wrong, please try again later",
		})
		logboi.Warn("Got userId 0 in FriendsGetRequests_Service, which is not expected behaviour")
		return
	}

	// Get target user's information
	var user db.User
	err := db.Db.Where("id = ?", id).First(&user).Error
	if err != nil {
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "Something went wrong, please try again later",
		})
		return
	}

	// Get friend requests targeted at user
	var friendRequests []db.FriendRequest
	err = db.Db.Where("target = ?", user.Uuid).Find(&friendRequests).Error
	if err == nil { // CHECK
		ctx.StatusCode(iris.StatusBadRequest)
		ctx.JSON(types.CommonErrorResponse{
			Error: "Something went wrong, please try again later",
		})
		return
	}

	length := len(friendRequests)
	var response []types.FriendRequest

	// Loop over friend requests to rewrite to response format
	for _, request := range friendRequests {
		// Get source user information
		var sourceUser db.User
		err = db.Db.Where("uuid = ?", request.Source).First(&sourceUser).Error
		if err != nil {
			ctx.StatusCode(iris.StatusInternalServerError)
			ctx.JSON(types.CommonErrorResponse{
				Error: "Something went wrong, please try again later",
			})
			return
		}

		// Add to response slice
		response = append(response, types.FriendRequest{
			CreatedAt:      request.CreatedAt.String(),
			SourceUsername: sourceUser.Username,
			SourceUuid:     request.Source,
			TargetUuid:     request.Target,
		})
	}

	// Write response
	ctx.JSON(types.FriendsGetRequestsResponse{
		Amount:   length,
		Requests: response,
	})
}