import {
  Controller,
  Get,
  Post,
  Param,
  Query,
  Body,
  Request,
  ParseIntPipe,
  Header,
  UseGuards,
} from "@nestjs/common";
import { Public } from "@bff/modules/auth/decorators/public.decorator.js";
import { SubscriptionsService } from "./subscriptions.service.js";
import { SimManagementService } from "./sim-management.service.js";
import { SimTopUpPricingService } from "./sim-management/services/sim-topup-pricing.service.js";

import {
  subscriptionQuerySchema,
  subscriptionListSchema,
  subscriptionSchema,
  subscriptionStatsSchema,
  simActionResponseSchema,
  simPlanChangeResultSchema,
  internetCancellationPreviewSchema,
} from "@customer-portal/domain/subscriptions";
import type {
  Subscription,
  SubscriptionList,
  SubscriptionStats,
  SimActionResponse,
  SimPlanChangeResult,
} from "@customer-portal/domain/subscriptions";
import type { InvoiceList } from "@customer-portal/domain/billing";
import type { ApiSuccessResponse } from "@customer-portal/domain/common";
import { apiSuccessResponseSchema } from "@customer-portal/domain/common";
import { createPaginationSchema } from "@customer-portal/domain/toolkit/validation/helpers";
import {
  simTopupRequestSchema,
  simChangePlanRequestSchema,
  simCancelRequestSchema,
  simFeaturesRequestSchema,
  simTopUpHistoryRequestSchema,
  simCancelFullRequestSchema,
  simChangePlanFullRequestSchema,
  simReissueFullRequestSchema,
  simHistoryQuerySchema,
  simSftpListQuerySchema,
  simCallHistoryImportQuerySchema,
  simTopUpPricingPreviewRequestSchema,
  simReissueEsimRequestSchema,
  simInfoSchema,
  simDetailsSchema,
  simUsageSchema,
  simTopUpHistorySchema,
  type SimAvailablePlan,
  type SimCancellationPreview,
  type SimDomesticCallHistoryResponse,
  type SimInternationalCallHistoryResponse,
  type SimSmsHistoryResponse,
} from "@customer-portal/domain/sim";
import { createZodDto, ZodResponse } from "nestjs-zod";
import type { RequestWithUser } from "@bff/modules/auth/auth.types.js";
import { SimPlanService } from "./sim-management/services/sim-plan.service.js";
import { SimCancellationService } from "./sim-management/services/sim-cancellation.service.js";
import { AdminGuard } from "@bff/core/security/guards/admin.guard.js";
import { EsimManagementService } from "./sim-management/services/esim-management.service.js";
import { SimCallHistoryService } from "./sim-management/services/sim-call-history.service.js";
import { InternetCancellationService } from "./internet-management/services/internet-cancellation.service.js";
import {
  internetCancelRequestSchema,
  type SimActionResponse as SubscriptionActionResponse,
} from "@customer-portal/domain/subscriptions";
import { invoiceListSchema } from "@customer-portal/domain/billing";

const subscriptionInvoiceQuerySchema = createPaginationSchema({
  defaultLimit: 10,
  maxLimit: 100,
  minLimit: 1,
});

class SubscriptionQueryDto extends createZodDto(subscriptionQuerySchema) {}
class SubscriptionInvoiceQueryDto extends createZodDto(subscriptionInvoiceQuerySchema) {}
class SimTopupRequestDto extends createZodDto(simTopupRequestSchema) {}
class SimChangePlanRequestDto extends createZodDto(simChangePlanRequestSchema) {}
class SimCancelRequestDto extends createZodDto(simCancelRequestSchema) {}
class SimFeaturesRequestDto extends createZodDto(simFeaturesRequestSchema) {}
class SimChangePlanFullRequestDto extends createZodDto(simChangePlanFullRequestSchema) {}
class SimCancelFullRequestDto extends createZodDto(simCancelFullRequestSchema) {}
class SimReissueFullRequestDto extends createZodDto(simReissueFullRequestSchema) {}
class InternetCancelRequestDto extends createZodDto(internetCancelRequestSchema) {}

class SimHistoryQueryDto extends createZodDto(simHistoryQuerySchema) {}
class SimSftpListQueryDto extends createZodDto(simSftpListQuerySchema) {}
class SimCallHistoryImportQueryDto extends createZodDto(simCallHistoryImportQuerySchema) {}
class SimTopUpPricingPreviewRequestDto extends createZodDto(simTopUpPricingPreviewRequestSchema) {}
class SimReissueEsimRequestDto extends createZodDto(simReissueEsimRequestSchema) {}
class SimTopUpHistoryRequestDto extends createZodDto(simTopUpHistoryRequestSchema) {}

class SimInfoDto extends createZodDto(simInfoSchema) {}
class SimDetailsDto extends createZodDto(simDetailsSchema) {}
class SimUsageDto extends createZodDto(simUsageSchema) {}
class SimTopUpHistoryDto extends createZodDto(simTopUpHistorySchema) {}

class SubscriptionListDto extends createZodDto(subscriptionListSchema) {}
class SubscriptionDto extends createZodDto(subscriptionSchema) {}
class SubscriptionStatsDto extends createZodDto(subscriptionStatsSchema) {}
class SimActionResponseDto extends createZodDto(simActionResponseSchema) {}
class SimPlanChangeResultDto extends createZodDto(simPlanChangeResultSchema) {}
class InvoiceListDto extends createZodDto(invoiceListSchema) {}
class InternetCancellationPreviewResponseDto extends createZodDto(
  apiSuccessResponseSchema(internetCancellationPreviewSchema)
) {}

@Controller("subscriptions")
export class SubscriptionsController {
  constructor(
    private readonly subscriptionsService: SubscriptionsService,
    private readonly simManagementService: SimManagementService,
    private readonly simTopUpPricingService: SimTopUpPricingService,
    private readonly simPlanService: SimPlanService,
    private readonly simCancellationService: SimCancellationService,
    private readonly esimManagementService: EsimManagementService,
    private readonly simCallHistoryService: SimCallHistoryService,
    private readonly internetCancellationService: InternetCancellationService
  ) {}

  @Get()
  @Header("Cache-Control", "private, max-age=300") // 5 minutes, user-specific
  @ZodResponse({ description: "List subscriptions", type: SubscriptionListDto })
  async getSubscriptions(
    @Request() req: RequestWithUser,
    @Query() query: SubscriptionQueryDto
  ): Promise<SubscriptionList> {
    const { status } = query;
    return this.subscriptionsService.getSubscriptions(req.user.id, { status });
  }

  @Get("active")
  @Header("Cache-Control", "private, max-age=300") // 5 minutes, user-specific
  @ZodResponse({ description: "List active subscriptions", type: [SubscriptionDto] })
  async getActiveSubscriptions(@Request() req: RequestWithUser): Promise<Subscription[]> {
    return this.subscriptionsService.getActiveSubscriptions(req.user.id);
  }

  @Get("stats")
  @Header("Cache-Control", "private, max-age=300") // 5 minutes, user-specific
  @ZodResponse({ description: "Get subscription stats", type: SubscriptionStatsDto })
  async getSubscriptionStats(@Request() req: RequestWithUser): Promise<SubscriptionStats> {
    return this.subscriptionsService.getSubscriptionStats(req.user.id);
  }

  // ==================== Static SIM Routes (must be before :id routes) ====================

  /**
   * Get available months for call/SMS history
   */
  @Public()
  @Get("sim/call-history/available-months")
  @Header("Cache-Control", "public, max-age=3600")
  async getAvailableMonths() {
    const months = await this.simCallHistoryService.getAvailableMonths();
    return { success: true, data: months };
  }

  /**
   * List available files on SFTP for debugging
   */
  @UseGuards(AdminGuard)
  @Get("sim/call-history/sftp-files")
  async listSftpFiles(@Query() query: SimSftpListQueryDto) {
    const parsedQuery = simSftpListQuerySchema.parse(query as unknown);
    const files = await this.simCallHistoryService.listSftpFiles(parsedQuery.path);
    return { success: true, data: files, path: parsedQuery.path };
  }

  /**
   * Trigger manual import of call history (admin only)
   */
  @UseGuards(AdminGuard)
  @Post("sim/call-history/import")
  async importCallHistory(@Query() query: SimCallHistoryImportQueryDto) {
    const parsedQuery = simCallHistoryImportQuerySchema.parse(query as unknown);
    const result = await this.simCallHistoryService.importCallHistory(parsedQuery.month);
    return {
      success: true,
      message: `Imported ${result.domestic} domestic calls, ${result.international} international calls, ${result.sms} SMS`,
      data: result,
    };
  }

  @Get("sim/top-up/pricing")
  @Header("Cache-Control", "public, max-age=3600") // 1 hour, pricing is relatively static
  async getSimTopUpPricing() {
    const pricing = await this.simTopUpPricingService.getTopUpPricing();
    return { success: true, data: pricing };
  }

  @Get("sim/top-up/pricing/preview")
  @Header("Cache-Control", "public, max-age=3600") // 1 hour, pricing calculation is deterministic
  async previewSimTopUpPricing(@Query() query: SimTopUpPricingPreviewRequestDto) {
    const preview = await this.simTopUpPricingService.calculatePricingPreview(query.quotaMb);
    return { success: true, data: preview };
  }

  @Get("debug/sim-details/:account")
  @UseGuards(AdminGuard)
  async debugSimDetails(@Param("account") account: string) {
    return await this.simManagementService.getSimDetailsDebug(account);
  }

  // ==================== Dynamic :id Routes ====================

  @Get(":id")
  @Header("Cache-Control", "private, max-age=300") // 5 minutes, user-specific
  @ZodResponse({ description: "Get subscription", type: SubscriptionDto })
  async getSubscriptionById(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ): Promise<Subscription> {
    return this.subscriptionsService.getSubscriptionById(req.user.id, subscriptionId);
  }

  @Get(":id/invoices")
  @Header("Cache-Control", "private, max-age=60") // 1 minute, may update with payments
  @ZodResponse({ description: "Get subscription invoices", type: InvoiceListDto })
  async getSubscriptionInvoices(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Query() query: SubscriptionInvoiceQueryDto
  ): Promise<InvoiceList> {
    return this.subscriptionsService.getSubscriptionInvoices(req.user.id, subscriptionId, query);
  }

  // ==================== SIM Management Endpoints (subscription-specific) ====================

  @Get(":id/sim/debug")
  @UseGuards(AdminGuard)
  async debugSimSubscription(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ): Promise<Record<string, unknown>> {
    return this.simManagementService.debugSimSubscription(req.user.id, subscriptionId);
  }

  @Get(":id/sim")
  @ZodResponse({ description: "Get SIM info", type: SimInfoDto })
  async getSimInfo(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ) {
    return this.simManagementService.getSimInfo(req.user.id, subscriptionId);
  }

  @Get(":id/sim/details")
  @ZodResponse({ description: "Get SIM details", type: SimDetailsDto })
  async getSimDetails(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ) {
    return this.simManagementService.getSimDetails(req.user.id, subscriptionId);
  }

  @Get(":id/sim/usage")
  @ZodResponse({ description: "Get SIM usage", type: SimUsageDto })
  async getSimUsage(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ) {
    return this.simManagementService.getSimUsage(req.user.id, subscriptionId);
  }

  @Get(":id/sim/top-up-history")
  @ZodResponse({ description: "Get SIM top-up history", type: SimTopUpHistoryDto })
  async getSimTopUpHistory(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Query() query: SimTopUpHistoryRequestDto
  ) {
    return this.simManagementService.getSimTopUpHistory(req.user.id, subscriptionId, query);
  }

  @Post(":id/sim/top-up")
  @ZodResponse({ description: "Top up SIM", type: SimActionResponseDto })
  async topUpSim(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimTopupRequestDto
  ): Promise<SimActionResponse> {
    await this.simManagementService.topUpSim(req.user.id, subscriptionId, body);
    return { success: true, message: "SIM top-up completed successfully" };
  }

  @Post(":id/sim/change-plan")
  @ZodResponse({ description: "Change SIM plan", type: SimPlanChangeResultDto })
  async changeSimPlan(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimChangePlanRequestDto
  ): Promise<SimPlanChangeResult> {
    const result = await this.simManagementService.changeSimPlan(req.user.id, subscriptionId, body);
    return {
      success: true,
      message: "SIM plan change completed successfully",
      ...result,
    };
  }

  @Post(":id/sim/cancel")
  @ZodResponse({ description: "Cancel SIM", type: SimActionResponseDto })
  async cancelSim(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimCancelRequestDto
  ): Promise<SimActionResponse> {
    await this.simManagementService.cancelSim(req.user.id, subscriptionId, body);
    return { success: true, message: "SIM cancellation completed successfully" };
  }

  @Post(":id/sim/reissue-esim")
  async reissueEsimProfile(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimReissueEsimRequestDto
  ): Promise<SimActionResponse> {
    const parsedBody = simReissueEsimRequestSchema.parse(body as unknown);
    await this.simManagementService.reissueEsimProfile(
      req.user.id,
      subscriptionId,
      parsedBody.newEid
    );
    return { success: true, message: "eSIM profile reissue completed successfully" };
  }

  @Post(":id/sim/features")
  @ZodResponse({ description: "Update SIM features", type: SimActionResponseDto })
  async updateSimFeatures(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimFeaturesRequestDto
  ): Promise<SimActionResponse> {
    await this.simManagementService.updateSimFeatures(req.user.id, subscriptionId, body);
    return { success: true, message: "SIM features updated successfully" };
  }

  // ==================== Enhanced SIM Management Endpoints ====================

  /**
   * Get available plans for plan change (filtered by current plan type)
   */
  @Get(":id/sim/available-plans")
  @Header("Cache-Control", "private, max-age=300")
  async getAvailablePlans(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ): Promise<ApiSuccessResponse<SimAvailablePlan[]>> {
    const plans = await this.simPlanService.getAvailablePlans(req.user.id, subscriptionId);
    return { success: true, data: plans };
  }

  /**
   * Change SIM plan with enhanced flow (Salesforce SKU mapping + email notifications)
   */
  @Post(":id/sim/change-plan-full")
  @ZodResponse({ description: "Change SIM plan (full)", type: SimPlanChangeResultDto })
  async changeSimPlanFull(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimChangePlanFullRequestDto
  ): Promise<SimPlanChangeResult> {
    const result = await this.simPlanService.changeSimPlanFull(req.user.id, subscriptionId, body);
    return {
      success: true,
      message: `SIM plan change scheduled for ${result.scheduledAt}`,
      ...result,
    };
  }

  /**
   * Get cancellation preview (available months, customer info, minimum contract term)
   */
  @Get(":id/sim/cancellation-preview")
  @Header("Cache-Control", "private, max-age=60")
  async getCancellationPreview(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ): Promise<ApiSuccessResponse<SimCancellationPreview>> {
    const preview = await this.simCancellationService.getCancellationPreview(
      req.user.id,
      subscriptionId
    );
    return { success: true, data: preview };
  }

  /**
   * Cancel SIM with full flow (PA02-04 + email notifications)
   */
  @Post(":id/sim/cancel-full")
  @ZodResponse({ description: "Cancel SIM (full)", type: SimActionResponseDto })
  async cancelSimFull(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimCancelFullRequestDto
  ): Promise<SimActionResponse> {
    await this.simCancellationService.cancelSimFull(req.user.id, subscriptionId, body);
    return {
      success: true,
      message: `SIM cancellation scheduled for end of ${body.cancellationMonth}`,
    };
  }

  /**
   * Reissue SIM (both eSIM and physical SIM)
   */
  @Post(":id/sim/reissue")
  @ZodResponse({ description: "Reissue SIM", type: SimActionResponseDto })
  async reissueSim(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: SimReissueFullRequestDto
  ): Promise<SimActionResponse> {
    await this.esimManagementService.reissueSim(req.user.id, subscriptionId, body);

    if (body.simType === "esim") {
      return { success: true, message: "eSIM profile reissue request submitted" };
    } else {
      return {
        success: true,
        message: "Physical SIM reissue request submitted. You will be contacted shortly.",
      };
    }
  }

  // ==================== Internet Management Endpoints ====================

  /**
   * Get Internet cancellation preview (available months, service details)
   */
  @Get(":id/internet/cancellation-preview")
  @Header("Cache-Control", "private, max-age=60")
  @ZodResponse({
    description: "Get internet cancellation preview",
    type: InternetCancellationPreviewResponseDto,
  })
  async getInternetCancellationPreview(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number
  ) {
    const preview = await this.internetCancellationService.getCancellationPreview(
      req.user.id,
      subscriptionId
    );
    return { success: true as const, data: preview };
  }

  /**
   * Submit Internet cancellation request
   */
  @Post(":id/internet/cancel")
  @ZodResponse({ description: "Cancel internet", type: SimActionResponseDto })
  async cancelInternet(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Body() body: InternetCancelRequestDto
  ): Promise<SubscriptionActionResponse> {
    await this.internetCancellationService.submitCancellation(req.user.id, subscriptionId, body);
    return {
      success: true,
      message: `Internet cancellation scheduled for end of ${body.cancellationMonth}`,
    };
  }

  // ==================== Call/SMS History Endpoints ====================

  /**
   * Get domestic call history
   */
  @Get(":id/sim/call-history/domestic")
  @Header("Cache-Control", "private, max-age=300")
  async getDomesticCallHistory(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Query() query: SimHistoryQueryDto
  ): Promise<ApiSuccessResponse<SimDomesticCallHistoryResponse>> {
    const parsedQuery = simHistoryQuerySchema.parse(query as unknown);
    const result = await this.simCallHistoryService.getDomesticCallHistory(
      req.user.id,
      subscriptionId,
      parsedQuery.month,
      parsedQuery.page,
      parsedQuery.limit
    );
    return { success: true, data: result };
  }

  /**
   * Get international call history
   */
  @Get(":id/sim/call-history/international")
  @Header("Cache-Control", "private, max-age=300")
  async getInternationalCallHistory(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Query() query: SimHistoryQueryDto
  ): Promise<ApiSuccessResponse<SimInternationalCallHistoryResponse>> {
    const parsedQuery = simHistoryQuerySchema.parse(query as unknown);
    const result = await this.simCallHistoryService.getInternationalCallHistory(
      req.user.id,
      subscriptionId,
      parsedQuery.month,
      parsedQuery.page,
      parsedQuery.limit
    );
    return { success: true, data: result };
  }

  /**
   * Get SMS history
   */
  @Get(":id/sim/sms-history")
  @Header("Cache-Control", "private, max-age=300")
  async getSmsHistory(
    @Request() req: RequestWithUser,
    @Param("id", ParseIntPipe) subscriptionId: number,
    @Query() query: SimHistoryQueryDto
  ): Promise<ApiSuccessResponse<SimSmsHistoryResponse>> {
    const parsedQuery = simHistoryQuerySchema.parse(query as unknown);
    const result = await this.simCallHistoryService.getSmsHistory(
      req.user.id,
      subscriptionId,
      parsedQuery.month,
      parsedQuery.page,
      parsedQuery.limit
    );
    return { success: true, data: result };
  }
}