import {
  Body,
  Controller,
  Get,
  NotFoundException,
  Param,
  Post,
  Request,
  Sse,
  UsePipes,
  UseGuards,
  UnauthorizedException,
  type MessageEvent,
} from "@nestjs/common";
import { RateLimitGuard, RateLimit } from "@bff/core/rate-limiting/index.js";
import { OrderOrchestrator } from "./services/order-orchestrator.service.js";
import type { RequestWithUser } from "@bff/modules/auth/auth.types.js";
import { Logger } from "nestjs-pino";
import { ZodValidationPipe } from "nestjs-zod";
import {
  createOrderRequestSchema,
  orderCreateResponseSchema,
  sfOrderIdParamSchema,
  type CreateOrderRequest,
  type SfOrderIdParam,
} from "@customer-portal/domain/orders";
import { apiSuccessResponseSchema } from "@customer-portal/domain/common";
import { Observable } from "rxjs";
import { OrderEventsService } from "./services/order-events.service.js";
import { SalesforceReadThrottleGuard } from "@bff/integrations/salesforce/guards/salesforce-read-throttle.guard.js";
import { SalesforceWriteThrottleGuard } from "@bff/integrations/salesforce/guards/salesforce-write-throttle.guard.js";
import { CheckoutService } from "./services/checkout.service.js";
import { CheckoutSessionService } from "./services/checkout-session.service.js";
import { z } from "zod";

const checkoutSessionCreateOrderSchema = z.object({
  checkoutSessionId: z.string().uuid(),
});

@Controller("orders")
@UseGuards(RateLimitGuard)
export class OrdersController {
  constructor(
    private orderOrchestrator: OrderOrchestrator,
    private readonly checkoutService: CheckoutService,
    private readonly checkoutSessions: CheckoutSessionService,
    private readonly orderEvents: OrderEventsService,
    private readonly logger: Logger
  ) {}

  private readonly createOrderResponseSchema = apiSuccessResponseSchema(orderCreateResponseSchema);

  @Post()
  @UseGuards(SalesforceWriteThrottleGuard)
  @RateLimit({ limit: 5, ttl: 60 }) // 5 order creations per minute
  @UsePipes(new ZodValidationPipe(createOrderRequestSchema))
  async create(@Request() req: RequestWithUser, @Body() body: CreateOrderRequest) {
    this.logger.log(
      {
        userId: req.user?.id,
        orderType: body.orderType,
        skuCount: body.skus?.length || 0,
      },
      "Order creation request received"
    );

    try {
      const result = await this.orderOrchestrator.createOrder(req.user.id, body);
      return this.createOrderResponseSchema.parse({ success: true, data: result });
    } catch (error) {
      this.logger.error(
        {
          error: error instanceof Error ? error.message : String(error),
          userId: req.user?.id,
          orderType: body.orderType,
        },
        "Order creation failed"
      );
      throw error;
    }
  }

  @Post("from-checkout-session")
  @UseGuards(SalesforceWriteThrottleGuard)
  @RateLimit({ limit: 5, ttl: 60 }) // 5 order creations per minute
  @UsePipes(new ZodValidationPipe(checkoutSessionCreateOrderSchema))
  async createFromCheckoutSession(
    @Request() req: RequestWithUser,
    @Body() body: { checkoutSessionId: string }
  ) {
    this.logger.log(
      {
        userId: req.user?.id,
        checkoutSessionId: body.checkoutSessionId,
      },
      "Order creation from checkout session request received"
    );

    const session = await this.checkoutSessions.getSession(body.checkoutSessionId);

    const cart = await this.checkoutService.buildCart(
      session.request.orderType,
      session.request.selections,
      session.request.configuration,
      req.user?.id
    );

    const uniqueSkus = Array.from(
      new Set(
        cart.items
          .map(item => item.sku)
          .filter((sku): sku is string => typeof sku === "string" && sku.trim().length > 0)
      )
    );

    if (uniqueSkus.length === 0) {
      throw new NotFoundException("Checkout session contains no items");
    }

    const orderBody: CreateOrderRequest = {
      orderType: session.request.orderType,
      skus: uniqueSkus,
      ...(Object.keys(cart.configuration ?? {}).length > 0
        ? { configurations: cart.configuration }
        : {}),
    };

    const result = await this.orderOrchestrator.createOrder(req.user.id, orderBody);

    await this.checkoutSessions.deleteSession(body.checkoutSessionId);

    return this.createOrderResponseSchema.parse({ success: true, data: result });
  }

  @Get("user")
  @UseGuards(SalesforceReadThrottleGuard)
  async getUserOrders(@Request() req: RequestWithUser) {
    return this.orderOrchestrator.getOrdersForUser(req.user.id);
  }

  @Get(":sfOrderId")
  @UsePipes(new ZodValidationPipe(sfOrderIdParamSchema))
  @UseGuards(SalesforceReadThrottleGuard)
  async get(@Request() req: RequestWithUser, @Param() params: SfOrderIdParam) {
    if (!req.user?.id) {
      throw new UnauthorizedException("Authentication required");
    }
    return this.orderOrchestrator.getOrderForUser(params.sfOrderId, req.user.id);
  }

  @Sse(":sfOrderId/events")
  @UsePipes(new ZodValidationPipe(sfOrderIdParamSchema))
  @UseGuards(SalesforceReadThrottleGuard)
  async streamOrderUpdates(
    @Request() req: RequestWithUser,
    @Param() params: SfOrderIdParam
  ): Promise<Observable<MessageEvent>> {
    // Ensure caller is allowed to access this order stream (avoid leaking existence)
    try {
      await this.orderOrchestrator.getOrderForUser(params.sfOrderId, req.user.id);
    } catch {
      throw new NotFoundException("Order not found");
    }
    return this.orderEvents.subscribe(params.sfOrderId);
  }

  // Note: Order provisioning has been moved to SalesforceProvisioningController
  // This controller now focuses only on customer-facing order operations
}