import {
  Body,
  Controller,
  Delete,
  HttpCode,
  HttpStatus,
  NotFoundException,
  Param,
  Post,
  UseGuards,
} from "@nestjs/common";
import { getPrismaClient, withTenantContext } from "@b2bcall/database";
import { recordAuditEvent, type AccessTokenClaims } from "@b2bcall/auth";
import { JwtAuthGuard } from "../common/guards/jwt-auth.guard";
import { PermissionGuard } from "../common/guards/permission.guard";
import { RequirePermission } from "../common/decorators/require-permission.decorator";
import { CurrentUser } from "../common/decorators/current-user.decorator";
import { AddQueueAgentDto } from "./dto/add-queue-agent.dto";
import { notifyTierChanged } from "../agents/agent-sync.helper";

@UseGuards(JwtAuthGuard, PermissionGuard)
@Controller("queues/:queueId/agents")
export class QueueAgentsController {
  @RequirePermission("queues.manage")
  @Post()
  async add(
    @CurrentUser() user: AccessTokenClaims,
    @Param("queueId") queueId: string,
    @Body() dto: AddQueueAgentDto,
  ) {
    const prisma = getPrismaClient();
    const tenantId = user.tenantId!;

    const [queue, agent] = await withTenantContext(prisma, tenantId, (tx) =>
      Promise.all([
        tx.queue.findFirst({ where: { id: queueId, tenantId, deletedAt: null } }),
        tx.agent.findFirst({ where: { id: dto.agentId, tenantId, deletedAt: null } }),
      ]),
    );
    if (!queue || !agent) {
      throw new NotFoundException("Fila ou agente nao encontrado");
    }

    const level = dto.level ?? 1;
    const position = dto.position ?? 1;

    const tier = await withTenantContext(prisma, tenantId, (tx) =>
      tx.tier.upsert({
        where: { queueId_agentId: { queueId, agentId: dto.agentId } },
        update: { level, position },
        create: { tenantId, queueId, agentId: dto.agentId, level, position },
      }),
    );

    await recordAuditEvent(prisma, {
      action: "TIER_ADD",
      tenantId,
      userId: user.sub,
      entityType: "tier",
      entityId: tier.id,
      after: { queueId, agentId: dto.agentId, level, position },
    });

    await notifyTierChanged(tenantId, queueId, dto.agentId, "upsert", level, position);

    return tier;
  }

  @RequirePermission("queues.manage")
  @Delete(":agentId")
  @HttpCode(HttpStatus.NO_CONTENT)
  async remove(
    @CurrentUser() user: AccessTokenClaims,
    @Param("queueId") queueId: string,
    @Param("agentId") agentId: string,
  ) {
    const prisma = getPrismaClient();
    const tenantId = user.tenantId!;

    const result = await withTenantContext(prisma, tenantId, (tx) =>
      tx.tier.deleteMany({ where: { tenantId, queueId, agentId } }),
    );
    if (result.count === 0) {
      throw new NotFoundException();
    }

    await recordAuditEvent(prisma, {
      action: "TIER_REMOVE",
      tenantId,
      userId: user.sub,
      entityType: "tier",
      entityId: `${queueId}:${agentId}`,
    });

    await notifyTierChanged(tenantId, queueId, agentId, "delete");
  }
}