import http from "node:http";

import { ControlApiServer } from "../src/http/ControlApiServer";
import { ControlPortState, ControllerControlStatus } from "../src/domain/ControlTypes";
import { Logger } from "../src/observability/Logger";
import { ControllerControlBackend } from "../src/services/ControllerControlBackend";
import { RuleEngineService } from "../src/services/RuleEngineService";

class FakeBackend implements ControllerControlBackend {
  private mac: string | null = null;
  private ports: ControlPortState[] = [
    { port: 1, name: "Port 1", fanGroup: "outlet", currentSpeedLevel: 0, online: true, powerState: false },
    { port: 2, name: "Port 2", fanGroup: "inside_inlet", currentSpeedLevel: 0, online: true, powerState: false },
    { port: 3, name: "Port 3", fanGroup: "outside_inlet", currentSpeedLevel: 0, online: true, powerState: false },
    { port: 4, name: "Port 4", fanGroup: "interior", currentSpeedLevel: 0, online: true, powerState: false }
  ];

  public async getStatus(): Promise<ControllerControlStatus> {
    return {
      mode: "ble",
      backend: "fake",
      controllerMac: this.mac,
      connected: this.mac !== null,
      paired: this.mac !== null,
      telemetrySource: "ble",
      lastSnapshotEpochSeconds: null,
      capabilities: {
        pairing: true,
        portControl: true,
        advancedRules: true
      },
      ports: this.ports,
      notes: []
    };
  }

  public async pair(macAddress: string): Promise<ControllerControlStatus> {
    this.mac = macAddress;
    return this.getStatus();
  }

  public async getPorts(): Promise<ControlPortState[]> {
    return this.ports;
  }

  public async setPortSpeed(port: number, speedLevel: number): Promise<void> {
    this.ports = this.ports.map((item) => {
      if (item.port !== port) {
        return item;
      }
      return {
        ...item,
        currentSpeedLevel: speedLevel,
        powerState: speedLevel > 0
      };
    });
  }
}

async function requestJson(
  port: number,
  method: string,
  path: string,
  body?: unknown
): Promise<{ statusCode: number; payload: unknown }> {
  return new Promise((resolve, reject) => {
    const req = http.request(
      {
        host: "127.0.0.1",
        port,
        method,
        path,
        headers: body ? { "content-type": "application/json" } : undefined
      },
      (res) => {
        const chunks: Buffer[] = [];
        res.on("data", (chunk) => {
          chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
        });
        res.on("end", () => {
          const text = Buffer.concat(chunks).toString("utf8");
          let parsed: unknown = text;
          try {
            parsed = JSON.parse(text);
          } catch {
            // non-json response in tests should still be visible
          }
          resolve({
            statusCode: res.statusCode ?? 0,
            payload: parsed
          });
        });
      }
    );

    req.on("error", reject);
    if (body !== undefined) {
      req.write(JSON.stringify(body));
    }
    req.end();
  });
}

describe("ControlApiServer", () => {
  it("supports status, pair, and per-port speed writes", async () => {
    const backend = new FakeBackend();
    const rules = new RuleEngineService();
    const logger = new Logger("error", "test");
    const port = 19110;

    const server = new ControlApiServer(port, backend, rules, logger, "58:8C:81:C6:FC:F6");
    await server.start();

    const statusBefore = await requestJson(port, "GET", "/api/v2/status");
    expect(statusBefore.statusCode).toBe(200);

    const pair = await requestJson(port, "POST", "/api/v2/pair", {});
    expect(pair.statusCode).toBe(200);

    const setSpeed = await requestJson(port, "POST", "/api/v2/ports/4/speed", { speed_level: 8 });
    expect(setSpeed.statusCode).toBe(200);

    const ports = await requestJson(port, "GET", "/api/v2/ports");
    expect(ports.statusCode).toBe(200);
    const parsed = ports.payload as { ports?: Array<{ port: number; currentSpeedLevel: number }> };
    const interior = parsed.ports?.find((item) => item.port === 4);
    expect(interior?.currentSpeedLevel).toBe(8);

    await server.stop();
  });
});