import {
  Body,
  Controller,
  HttpException,
  HttpStatus,
  Param,
  Post,
  Session,
  Sse,
  UseGuards,
} from '@nestjs/common';
import { LobbyService } from '../services/lobby.service';
import { AuthGuard } from '../guards/auth.guard';
import { ApiOperation, ApiResponse, ApiTags } from '@nestjs/swagger';
import { Game } from '../entities/game.entity';
import { GamePipe, GameStartedPipe } from '../pipe/game.pipe';

import { Observable, fromEvent, map } from 'rxjs';
import { EventEmitter2 } from '@nestjs/event-emitter';
import { GameService } from '../services/games.service';
import { ConfigService } from '@nestjs/config';
import { SessionData } from 'express-session';

@ApiTags('game')
@Controller('games/:id')
export class GamesController {
  constructor(
    private readonly lobbyService: LobbyService,
    private readonly gameService: GameService,
    private eventEmitter: EventEmitter2,
    private configService: ConfigService,
  ) {}

  @Post('/start')
  @ApiOperation({ summary: 'Start game' })
  @ApiResponse({
    status: 201,
    description: 'Game successfully started.',
  })
  @ApiResponse({
    status: 400,
    description: 'Bad Request',
  })
  @ApiResponse({
    status: 403,
    description: 'You can only start games you own',
  })
  @UseGuards(AuthGuard)
  async start(
    @Param('id') id: string,
    @Session() session: SessionData,
    @Param('id', GamePipe) game: Game,
  ) {
    if (game.started) {
      throw new HttpException('Game already started', HttpStatus.BAD_REQUEST);
    }
    if (game.players.length < 2 && !this.configService.get('DEV_MODE')) {
      throw new HttpException(
        'Not enough teams to start the game',
        HttpStatus.BAD_REQUEST,
      );
    }
    if (game.owner.id != session.user.id) {
      throw new HttpException(
        'You can only start games you own',
        HttpStatus.FORBIDDEN,
      );
    }
    await this.gameService.start(game);
    return;
  }

  @Post('surrender')
  @ApiOperation({ summary: 'Leave a game that has already started' })
  @UseGuards(AuthGuard)
  surrender(
    @Param('id') id: string,
    @Session() session: SessionData,
    @Param('id', GamePipe) game: Game,
  ) {
    if (!game.started) {
      throw new HttpException('Game has not started', HttpStatus.BAD_REQUEST);
    }
    return this.lobbyService.leaveGame(game, session.user);
  }

  @Post('kick/:playerId')
  @ApiOperation({ summary: 'Kick a player' })
  @UseGuards(AuthGuard)
  kick(
    @Param('id') id: string,
    @Session() session: SessionData,
    @Param('id', GamePipe) game: Game,
    @Param('playerId') playerId: string,
  ) {
    if (session.user.id != game.owner.id) {
      throw new HttpException(
        'You do do not own this game',
        HttpStatus.FORBIDDEN,
      );
    }
    return this.lobbyService.kickPlayer(game, session.user, playerId);
  }

  @Sse('/subscribe')
  subscribe(@Param('id') id: string): Observable<{ data: string }> {
    return fromEvent(this.eventEmitter, 'sse.game.' + id).pipe(
      map((payload: any) => {
        return {
          data: JSON.stringify(payload),
        };
      }),
    );
  }
}