import { Controller, Get, Res, Inject } from "@nestjs/common";
import type { Response } from "express";
import { HealthService, type ComponentHealth } from "./health.service";

interface ReadinessBody {
  status: "ready" | "degraded";
  components: Record<string, ComponentHealth>;
}

@Controller()
export class HealthController {
  constructor(@Inject(HealthService) private readonly health: HealthService) {}

  @Get("healthz")
  liveness(@Res() res: Response): void {
    res.status(200).json({ status: "alive" });
  }

  @Get("readyz")
  async readiness(@Res() res: Response): Promise<void> {
    const components = await this.health.components();
    const ready = Object.values(components).every((c) => c.status === "up");
    const body: ReadinessBody = { status: ready ? "ready" : "degraded", components };
    res.status(ready ? 200 : 503).json(body);
  }
}