import {
  Body,
  Controller,
  Delete,
  ForbiddenException,
  Get,
  Param,
  Patch,
  Post,
  Query,
  Req,
  SetMetadata,
  UseGuards,
} from "@nestjs/common";
import { FacilitiesService } from "./facilities.service";
// import { JwtAuthGuard } from "../auth/guards/jwt-auth.guard";
import { RolesGuard } from "../auth/guards/roles.guard";
import { JwtAuthGuard } from "src/auth/guards/jwt-auth.guard";

const Roles = (...roles: string[]) => SetMetadata("roles", roles);

@UseGuards(JwtAuthGuard, RolesGuard)
@Controller("facilities")
export class FacilitiesController {
  constructor(private readonly facilitiesService: FacilitiesService) {}

  // ─── FACILITY CRUD (SUPER_ADMIN only) ────────────────────────────────────

  /** POST /facilities */
  @Roles("SUPER_ADMIN")
  @Post()
  create(
    @Body()
    body: {
      organizationId?: string;
      name: string;
      address?: string;
      phone?: string;
      adminFirstName: string;
      adminLastName: string;
      adminEmail: string;
      adminPhone?: string;
      adminType?: string;
    },
  ) {
    return this.facilitiesService.create(body);
  }

  /** GET /facilities */
  @Roles("SUPER_ADMIN", "FACILITY_ADMIN", "FACILITY_STAFF")
  @Get()
  findAll() {
    return this.facilitiesService.findAll();
  }

  /** GET /facilities/:id */
  @Roles("SUPER_ADMIN", "FACILITY_ADMIN", "FACILITY_STAFF")
  @Get(":id")
  findOne(@Param("id") id: string, @Req() req: any) {
    const requesterRole = req.user?.role;
    const requesterFacilityId = req.user?.healthcareWorker?.facilityId;
    
    // Only SUPER_ADMIN can access any facility, others can only access their own
    if (requesterRole !== "SUPER_ADMIN" && requesterFacilityId !== id) {
      throw new ForbiddenException("You are not authorized to access this facility");
    }
    
    return this.facilitiesService.findOne(id);
  }

  /** PATCH /facilities/:id */
  @Roles("SUPER_ADMIN")
  @Patch(":id")
  update(
    @Param("id") id: string,
    @Body()
    body: {
      organizationId?: string | null;
      name?: string;
      address?: string;
      phone?: string;
      isActive?: boolean;
    },
  ) {
    return this.facilitiesService.update(id, body);
  }

  /** PATCH /facilities/:id/deactivate */
  @Roles("SUPER_ADMIN")
  @Patch(":id/deactivate")
  deactivate(@Param("id") id: string) {
    return this.facilitiesService.deactivate(id);
  }

  // ─── QR FACILITY LINKING ─────────────────────────────────────────────────

  /**
   * Health worker generates a QR token for their facility.
   * Dashboard calls this then renders the token as a QR code.
   *
   * POST /facilities/generate-link-token
   * Auth: HEALTH_WORKER
   * Body: { healthWorkerId: string }  ← replace with req.user in prod
   */
  @Roles("FACILITY_ADMIN", "FACILITY_STAFF")
  @Post("generate-link-token")
  generateLinkToken(
    @Req() req: any,
    @Body() body: { healthWorkerId?: string },
  ) {
    // In production: const healthWorkerId = req.user.healthcareWorkerId
    const healthWorkerId = req.user?.healthcareWorkerId ?? body.healthWorkerId;
    return this.facilitiesService.generateLinkToken(healthWorkerId);
  }

  /**
   * Patient app calls this after scanning the QR code.
   *
   * POST /facilities/link-via-qr
   * Auth: PATIENT
   * Body: { token: string }
   */
  @Roles("PATIENT")
  @Post("link-via-qr")
  linkViaQR(@Req() req: any, @Body() body: { token: string; userId?: string }) {
    // In production: const userId = req.user.id
    const userId = req.user?.id ?? body.userId;
    return this.facilitiesService.linkPatientViaQR(userId, body.token);
  }

  /**
   * Get patient's current facility link status.
   *
   * GET /facilities/link-status
   * Auth: PATIENT
   */
  @Roles("PATIENT")
  @Get("link-status")
  getLinkStatus(@Req() req: any, @Query("userId") userId?: string) {
    // In production: const userId = req.user.id
    const id = req.user?.id ?? userId;
    return this.facilitiesService.getLinkStatus(id);
  }

  /**
   * Unlink patient from their current facility.
   *
   * DELETE /facilities/unlink
   * Auth: PATIENT
   */
  @Roles("PATIENT")
  @Delete("unlink")
  unlinkPatient(@Req() req: any, @Body() body: { userId?: string }) {
    // In production: const userId = req.user.id
    const userId = req.user?.id ?? body.userId;
    return this.facilitiesService.unlinkPatient(userId);
  }
}