import { type NextRequest, NextResponse } from "next/server";
import { optionalAuth } from "@/lib/auth/middleware";
import {
  getAdAnalytics,
  getMarketplaceStats,
  trackEvent,
  trackEventsBatch,
} from "@/lib/prisma/queries/telemetry";
import {
  checkRateLimit,
  createRateLimitResponse,
  getClientIP,
} from "@/lib/rate-limiter";
import { secureLogger } from "@/lib/secure-logger";
import {
  telemetryBatchSchema,
  telemetryEventSchema,
} from "@/lib/validation-schemas";

/**
 * POST /api/telemetry/event
 * Registra um único evento de telemetria
 */
export async function POST(request: NextRequest) {
  try {
    // Rate limiting
    const ip = getClientIP(request);
    const rateLimit = checkRateLimit(ip, "/api/telemetry/event");

    if (!rateLimit.allowed) {
      return createRateLimitResponse(rateLimit.resetAt);
    }

    // Autenticação opcional (usuários anônimos podem gerar eventos)
    const authResult = await optionalAuth(request);
    const userId =
      authResult instanceof NextResponse ? undefined : authResult?.userId;

    const body = await request.json();

    // Verificar se é batch ou evento único
    const isBatch =
      body.events && Array.isArray(body.events) && body.events.length > 0;

    if (isBatch) {
      // Batch de eventos
      // Garantir que todos os eventos tenham metadata
      const normalizedBody = {
        ...body,
        events: body.events.map((event: any) => ({
          ...event,
          metadata: event.metadata || {},
        })),
      };

      const validationResult = telemetryBatchSchema.safeParse(normalizedBody);

      if (!validationResult.success) {
        return NextResponse.json(
          {
            success: false,
            error: "Dados de entrada inválidos",
            details: validationResult.error.issues,
          },
          { status: 400 },
        );
      }

      const { events, session_id: batchSessionId } = validationResult.data;

      // Adicionar user_id e session_id aos eventos
      const eventsWithAuth = events.map((event) => ({
        ...event,
        user_id: userId,
        session_id: batchSessionId || event.session_id || undefined,
        ad_id: event.ad_id ?? undefined, // Converter null para undefined
        metadata: event.metadata || {},
      }));

      const trackedEvents = await trackEventsBatch(eventsWithAuth);

      secureLogger.debug("📊 Batch de eventos registrado", {
        count: trackedEvents.length,
        userId,
        ip,
      });

      return NextResponse.json(
        {
          success: true,
          events: trackedEvents,
        },
        { status: 201 },
      );
    } else {
      // Evento único
      // Garantir que o evento tenha metadata
      const normalizedBody = {
        ...body,
        metadata: body.metadata || {},
      };

      const validationResult = telemetryEventSchema.safeParse(normalizedBody);

      if (!validationResult.success) {
        return NextResponse.json(
          {
            success: false,
            error: "Dados de entrada inválidos",
            details: validationResult.error.issues,
          },
          { status: 400 },
        );
      }

      const eventData = validationResult.data;

      // Adicionar user_id e session_id
      const trackedEvent = await trackEvent({
        ...eventData,
        user_id: userId,
        session_id: body.session_id || undefined,
        ad_id: eventData.ad_id ?? undefined, // Converter null para undefined
        metadata: eventData.metadata || {},
      });

      secureLogger.debug("📊 Evento registrado", {
        eventType: eventData.event_type,
        adId: eventData.ad_id,
        userId,
        ip,
      });

      return NextResponse.json(
        {
          success: true,
          event: trackedEvent,
        },
        { status: 201 },
      );
    }
  } catch (error) {
    secureLogger.error("❌ Erro ao registrar evento de telemetria", {
      error: error instanceof Error ? error.message : "Erro desconhecido",
      stack: error instanceof Error ? error.stack : undefined,
    });

    return NextResponse.json(
      {
        success: false,
        error: "Erro ao registrar evento",
      },
      { status: 500 },
    );
  }
}

/**
 * GET /api/telemetry/analytics/:adId
 * Busca analytics de um anúncio específico
 */
export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const adIdParam = searchParams.get("adId");
    const dashboard = searchParams.get("dashboard");

    // Dashboard agregado (admin)
    if (dashboard === "true") {
      const startDateParam = searchParams.get("startDate");
      const endDateParam = searchParams.get("endDate");

      const startDate = startDateParam ? new Date(startDateParam) : undefined;
      const endDate = endDateParam ? new Date(endDateParam) : undefined;

      const stats = await getMarketplaceStats(startDate, endDate);

      return NextResponse.json(
        {
          success: true,
          stats,
        },
        { status: 200 },
      );
    }

    // Analytics de um anúncio específico
    if (adIdParam) {
      const adId = parseInt(adIdParam, 10);

      if (Number.isNaN(adId)) {
        return NextResponse.json(
          {
            success: false,
            error: "ID do anúncio inválido",
          },
          { status: 400 },
        );
      }

      const analytics = await getAdAnalytics(adId);

      if (!analytics) {
        return NextResponse.json(
          {
            success: false,
            error: "Analytics não encontrado para este anúncio",
          },
          { status: 404 },
        );
      }

      return NextResponse.json(
        {
          success: true,
          analytics,
        },
        { status: 200 },
      );
    }

    return NextResponse.json(
      {
        success: false,
        error: "Parâmetro 'adId' ou 'dashboard' é obrigatório",
      },
      { status: 400 },
    );
  } catch (error) {
    secureLogger.error("❌ Erro ao buscar analytics", {
      error: error instanceof Error ? error.message : "Erro desconhecido",
      stack: error instanceof Error ? error.stack : undefined,
    });

    return NextResponse.json(
      {
        success: false,
        error: "Erro ao buscar analytics",
      },
      { status: 500 },
    );
  }
}