import {
  Controller,
  Get,
  Post,
  Patch,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
} from '@nestjs/common';
import { ApiTags, ApiOperation, ApiResponse, ApiBearerAuth, ApiQuery } from '@nestjs/swagger';
import { ConnectionRequestsService } from './connection-requests.service';
import { CreateConnectionRequestDto, RespondConnectionRequestDto } from './dto';
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
import { RolesGuard } from '../auth/guards/roles.guard';
import { Roles } from '../auth/decorators/roles.decorator';
import { CurrentUser } from '../auth/decorators/current-user.decorator';
import { UserRole, ConnectionStatus } from '@prisma/client';
import { PrismaService } from '../prisma/prisma.service';

@ApiTags('Connection Requests')
@Controller('connection-requests')
@UseGuards(JwtAuthGuard, RolesGuard)
@ApiBearerAuth()
export class ConnectionRequestsController {
  constructor(
    private readonly connectionRequestsService: ConnectionRequestsService,
    private readonly prisma: PrismaService,
  ) {}

  @Post()
  @Roles(UserRole.USER)
  @ApiOperation({ summary: 'Create a connection request to an agent' })
  @ApiResponse({ status: 201, description: 'Connection request created successfully' })
  @ApiResponse({ status: 400, description: 'Agent is not available or invalid request' })
  @ApiResponse({ status: 409, description: 'Connection request already exists' })
  async createRequest(
    @CurrentUser() user: { id: string },
    @Body() dto: CreateConnectionRequestDto,
  ) {
    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.createRequest(user.id, dto);
  }

  @Get('my-requests')
  @Roles(UserRole.USER)
  @ApiOperation({ summary: 'Get all connection requests sent by the current user' })
  @ApiQuery({ name: 'status', enum: ConnectionStatus, required: false })
  @ApiResponse({ status: 200, description: 'Connection requests retrieved successfully' })
  async getMyRequests(
    @CurrentUser() user: { id: string },
    @Query('status') status?: ConnectionStatus,
  ) {
    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.getMyRequests(user.id, status);
  }

  @Get('received')
  @Roles(UserRole.AGENT)
  @ApiOperation({ summary: 'Get all connection requests received by the current agent' })
  @ApiQuery({ name: 'status', enum: ConnectionStatus, required: false })
  @ApiResponse({ status: 200, description: 'Connection requests retrieved successfully' })
  async getReceivedRequests(
    @CurrentUser() user: { id: string },
    @Query('status') status?: ConnectionStatus,
  ) {
    // Get agent profile for the current user
    const agentProfile = await this.prisma.agentProfile.findUnique({
      where: { userId: user.id },
      select: { id: true },
    });

    if (!agentProfile) {
      // Return empty array - TransformInterceptor will wrap it
      return [];
    }

    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.getReceivedRequests(
      agentProfile.id,
      status,
    );
  }

  @Get('received/counts')
  @Roles(UserRole.AGENT)
  @ApiOperation({ summary: 'Get connection request counts for the current agent' })
  @ApiResponse({ status: 200, description: 'Request counts retrieved successfully' })
  async getRequestCounts(@CurrentUser() user: { id: string }) {
    const agentProfile = await this.prisma.agentProfile.findUnique({
      where: { userId: user.id },
      select: { id: true },
    });

    if (!agentProfile) {
      // Return default counts - TransformInterceptor will wrap it
      return { pending: 0, accepted: 0, rejected: 0, total: 0 };
    }

    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.getRequestCounts(agentProfile.id);
  }

  @Get('status/:agentProfileId')
  @Roles(UserRole.USER, UserRole.AGENT)
  @ApiOperation({ summary: 'Get connection status between current user and an agent' })
  @ApiResponse({ status: 200, description: 'Connection status retrieved successfully' })
  async getConnectionStatus(
    @CurrentUser() user: { id: string },
    @Param('agentProfileId') agentProfileId: string,
  ) {
    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.getConnectionStatus(
      user.id,
      agentProfileId,
    );
  }

  @Get(':id')
  @ApiOperation({ summary: 'Get a specific connection request by ID' })
  @ApiResponse({ status: 200, description: 'Connection request retrieved successfully' })
  @ApiResponse({ status: 404, description: 'Connection request not found' })
  async getRequestById(
    @CurrentUser() user: { id: string; role: UserRole },
    @Param('id') id: string,
  ) {
    let agentProfileId: string | undefined;

    if (user.role === UserRole.AGENT) {
      const agentProfile = await this.prisma.agentProfile.findUnique({
        where: { userId: user.id },
        select: { id: true },
      });
      agentProfileId = agentProfile?.id;
    }

    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.getRequestById(
      id,
      user.id,
      agentProfileId,
    );
  }

  @Patch(':id/respond')
  @Roles(UserRole.AGENT)
  @ApiOperation({ summary: 'Respond to a connection request (accept/reject)' })
  @ApiResponse({ status: 200, description: 'Response recorded successfully' })
  @ApiResponse({ status: 400, description: 'Request already responded to' })
  @ApiResponse({ status: 403, description: 'Not authorized to respond to this request' })
  @ApiResponse({ status: 404, description: 'Connection request not found' })
  async respondToRequest(
    @CurrentUser() user: { id: string },
    @Param('id') id: string,
    @Body() dto: RespondConnectionRequestDto,
  ) {
    const agentProfile = await this.prisma.agentProfile.findUnique({
      where: { userId: user.id },
      select: { id: true },
    });

    if (!agentProfile) {
      // Throw an error instead of returning non-standard response
      throw new Error('Agent profile not found');
    }

    // Return raw data - TransformInterceptor will wrap it
    return this.connectionRequestsService.respondToRequest(
      id,
      agentProfile.id,
      dto,
    );
  }

  @Delete(':id')
  @Roles(UserRole.USER)
  @ApiOperation({ summary: 'Cancel a pending connection request' })
  @ApiResponse({ status: 200, description: 'Connection request cancelled successfully' })
  @ApiResponse({ status: 400, description: 'Only pending requests can be cancelled' })
  @ApiResponse({ status: 403, description: 'Not authorized to cancel this request' })
  @ApiResponse({ status: 404, description: 'Connection request not found' })
  async cancelRequest(
    @CurrentUser() user: { id: string },
    @Param('id') id: string,
  ) {
    await this.connectionRequestsService.cancelRequest(id, user.id);
    // Return null/undefined - TransformInterceptor will wrap it as { success: true, data: null }
    return null;
  }
}