import { Injectable, HttpException, HttpStatus } from '@nestjs/common';
import { Repository } from 'typeorm';
import { InjectRepository } from '@nestjs/typeorm';

import { TaskEntity } from './task.entity';
import { CreateTaskDTO, EditTaskDTO } from './task.dto';
import { FactionEntity } from '../faction/faction.entity';
import { Game_PersonEntity } from '../game/game.entity';
import { NotificationGateway } from '../notifications/notifications.gateway';

@Injectable()
export class TaskService {
  constructor(
    @InjectRepository(TaskEntity)
    private taskRepository: Repository<TaskEntity>,
    @InjectRepository(FactionEntity)
    private factionRepository: Repository<FactionEntity>,
    @InjectRepository(Game_PersonEntity)
    private gamePersonRepository: Repository<Game_PersonEntity>,
    private notificationGateway: NotificationGateway,
  ) {}

  async newTask(task: CreateTaskDTO) {
    // check if is not null, check that the faction exists in the game
    if (
      task.faction != null &&
      !(await this.factionRepository.findOne({
        factionId: task.faction.toString(),
        game: task.taskGame,
      }))
    ) {
      throw new HttpException('Faction not found', HttpStatus.BAD_REQUEST);
    }
    const createdTask = await this.taskRepository.create(task);
    await this.taskRepository.insert(createdTask);
    // notify subscribers about a new task
    // if faction was set it notifies only faction members, else everyone
    this.notificationGateway.server.emit(
      task.faction != null ? task.faction.toString() : 'global',
      'new task',
    );
    return {
      message: 'Task added',
    };
  }

  async editTask(data: EditTaskDTO) {
    const task = await this.taskRepository.findOne(data.taskId);
    // checks if task is already closed
    if (!task.taskIsActive) {
      throw new HttpException('Task is not active', HttpStatus.BAD_REQUEST);
    }
    // checks if faction is valid
    if (
      !(await this.factionRepository.findOne({
        factionId: data.taskWinner.toString(),
        game: data.taskGame,
      }))
    ) {
      throw new HttpException('Faction not found', HttpStatus.BAD_REQUEST);
    }
    task.taskWinner = data.taskWinner;
    task.taskIsActive = false;
    await this.taskRepository.save(task);
    return {
      message: 'Task updated and closed',
    };
  }

  async fetchTasks(user, taskGame) {
    const gamePerson = await this.gamePersonRepository.findOne({
      where: {
        person: user,
        game: taskGame,
      },
      relations: ['faction'],
    });
    if (gamePerson.role == 'admin') {
      return await this.taskRepository.find({
        where: { taskGame: taskGame },
        relations: ['faction'],
      });
    } else {
      return await this.taskRepository.find({
        relations: ['faction'],
        where: [
          {
            taskGame: taskGame,
            faction: gamePerson.faction.factionId,
            taskIsActive: true,
          },
          {
            taskGame: taskGame,
            faction: null,
            taskIsActive: true,
          },
        ],
      });
    }
  }
}