import { BadRequestException, Body, Controller, Get, Headers, Param, Patch, Post, Query } from '@nestjs/common';
import { IiosTicketState } from '@prisma/client';
import { SupportService } from './support.service';
import { AssignmentService } from './assignment.service';
import { SessionVerifier } from '../platform/session.verifier';
import type { MessagePrincipal } from '../identity/actor.resolver';
import {
  AvailabilityDto,
  CallbackDto,
  CreateQueueDto,
  CreateTicketDto,
  EscalateDto,
  PatchTicketDto,
} from './support.dto';

@Controller('v1/support')
export class SupportController {
  constructor(
    private readonly support: SupportService,
    private readonly assignment: AssignmentService,
    private readonly session: SessionVerifier,
  ) {}

  @Post('tickets')
  async createTicket(@Body() body: CreateTicketDto, @Headers('authorization') auth?: string) {
    return this.support.createTicket(this.principal(auth), body);
  }

  @Post('escalate')
  async escalate(@Body() body: EscalateDto, @Headers('authorization') auth?: string) {
    return this.support.escalate(body.threadId, this.principal(auth), body.subject);
  }

  @Get('tickets')
  async listTickets(@Query('scope') scope?: string, @Headers('authorization') auth?: string) {
    return this.support.listTickets(this.principal(auth), { scope: scope === 'assigned' ? 'assigned' : 'mine' });
  }

  @Patch('tickets/:id')
  async patchTicket(@Param('id') id: string, @Body() body: PatchTicketDto, @Headers('authorization') auth?: string) {
    return this.support.transition(id, this.principal(auth), body.state as IiosTicketState, body.reason);
  }

  @Post('callbacks')
  async callback(@Body() body: CallbackDto, @Headers('authorization') auth?: string) {
    return this.support.requestCallback(this.principal(auth), {
      preferChannel: body.preferChannel,
      preferredTime: body.preferredTime ? new Date(body.preferredTime) : undefined,
      notes: body.notes,
      ticketId: body.ticketId,
    });
  }

  // ─── admin / agent ────────────────────────────────────────────────

  @Post('queues')
  async createQueue(@Body() body: CreateQueueDto, @Headers('authorization') auth?: string) {
    return this.assignment.createQueue(this.principal(auth), body.name);
  }

  @Post('queues/:id/members')
  async joinQueue(@Param('id') id: string, @Headers('authorization') auth?: string) {
    return this.assignment.addMember(id, this.principal(auth));
  }

  @Patch('members/me/availability')
  async availability(@Body() body: AvailabilityDto, @Headers('authorization') auth?: string) {
    return this.assignment.setAvailability(this.principal(auth), body.state);
  }

  private principal(authorization?: string): MessagePrincipal {
    const token = (authorization ?? '').replace(/^Bearer\s+/i, '');
    if (!token) throw new BadRequestException('Authorization bearer token is required');
    return this.session.verify(token);
  }
}