import http from "node:http";

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

function nextPort(): number {
  return 30_000 + Math.floor(Math.random() * 20_000);
}

class EdgeBackend implements ControllerControlBackend {
  public throwStatus = false;
  public wifiRecoveryRequests: WifiRecoveryRequest[] = [];

  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> {
    if (this.throwStatus) {
      throw new Error("status boom");
    }
    return {
      mode: "ble",
      backend: "fake",
      controllerMac: null,
      connected: false,
      paired: false,
      telemetrySource: "ble",
      lastSnapshotEpochSeconds: null,
      capabilities: {
        pairing: true,
        portControl: true,
        advancedRules: true
      },
      ports: this.ports,
      notes: []
    };
  }

  public async pair(): Promise<ControllerControlStatus> {
    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) => (
      item.port === port
        ? { ...item, currentSpeedLevel: speedLevel, powerState: speedLevel > 0 }
        : item
    ));
  }

  public async recoverWifi(request: WifiRecoveryRequest): Promise<WifiRecoveryResult> {
    this.wifiRecoveryRequests.push(request);
    return {
      queued: true,
      backend: "fake",
      controllerMac: null,
      notes: ["queued"]
    };
  }
}

async function requestRaw(
  port: number,
  method: string,
  path: string,
  body?: string,
  headers?: Record<string, string>
): Promise<{ statusCode: number; text: string; contentType: string }> {
  return new Promise((resolve, reject) => {
    const req = http.request(
      {
        host: "127.0.0.1",
        port,
        method,
        path,
        headers
      },
      (res) => {
        const chunks: Buffer[] = [];
        res.on("data", (chunk) => {
          chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
        });
        res.on("end", () => {
          resolve({
            statusCode: res.statusCode ?? 0,
            text: Buffer.concat(chunks).toString("utf8"),
            contentType: String(res.headers["content-type"] ?? "")
          });
        });
      }
    );
    req.on("error", reject);
    if (body !== undefined) {
      req.write(body);
    }
    req.end();
  });
}

async function requestJson(
  port: number,
  method: string,
  path: string,
  payload?: unknown
): Promise<{ statusCode: number; payload: unknown }> {
  const body = payload === undefined ? undefined : JSON.stringify(payload);
  const response = await requestRaw(
    port,
    method,
    path,
    body,
    body
      ? { "content-type": "application/json" }
      : undefined
  );
  return {
    statusCode: response.statusCode,
    payload: JSON.parse(response.text)
  };
}

describe("ControlApiServer edge cases", () => {
  it("serves health and ui routes", async () => {
    const backend = new EdgeBackend();
    const port = nextPort();
    const server = new ControlApiServer(
      port,
      backend,
      new RuleEngineService(),
      new Logger("error", "test"),
      null
    );
    try {
      await server.start();

      const health = await requestJson(port, "GET", "/healthz");
      expect(health.statusCode).toBe(200);
      expect(health.payload).toEqual({ ok: true });

      const ui = await requestRaw(port, "GET", "/ui");
      expect(ui.statusCode).toBe(200);
      expect(ui.contentType).toContain("text/html");
      expect(ui.text).toContain("Typhon v2 Control (Scaffold)");
    } finally {
      await server.stop();
    }
  });

  it("returns structured validation errors for malformed requests", async () => {
    const backend = new EdgeBackend();
    const port = nextPort();
    const server = new ControlApiServer(
      port,
      backend,
      new RuleEngineService(),
      new Logger("error", "test"),
      null
    );
    try {
      await server.start();

      const badJson = await requestRaw(
        port,
        "POST",
        "/api/v2/pair",
        "{bad-json",
        { "content-type": "application/json" }
      );
      expect(badJson.statusCode).toBe(400);
      expect(JSON.parse(badJson.text)).toEqual({ error: "request body must be valid JSON" });

      const hugeBody = `{\"payload\":\"${"x".repeat(70 * 1024)}\"}`;
      const tooLarge = await requestRaw(
        port,
        "POST",
        "/api/v2/rules",
        hugeBody,
        { "content-type": "application/json" }
      );
      expect(tooLarge.statusCode).toBe(413);
      expect(JSON.parse(tooLarge.text)).toEqual({ error: "request body too large" });

      const missingSpeed = await requestJson(port, "POST", "/api/v2/ports/1/speed", {});
      expect(missingSpeed.statusCode).toBe(400);
      expect(missingSpeed.payload).toEqual({ error: "speed_level is required" });

      const missingSsid = await requestJson(port, "POST", "/api/v2/wifi/recover", { password: "pw" });
      expect(missingSsid.statusCode).toBe(400);
      expect(missingSsid.payload).toEqual({ error: "ssid is required" });

      const missingPassword = await requestJson(port, "POST", "/api/v2/wifi/recover", { ssid: "atlas" });
      expect(missingPassword.statusCode).toBe(400);
      expect(missingPassword.payload).toEqual({ error: "password is required" });

      const invalidRulesBody = await requestJson(port, "POST", "/api/v2/rules", []);
      expect(invalidRulesBody.statusCode).toBe(400);
      expect(invalidRulesBody.payload).toEqual({ error: "request body must be a JSON object" });

      const notFound = await requestJson(port, "GET", "/api/v2/unknown");
      expect(notFound.statusCode).toBe(404);
      expect(notFound.payload).toEqual({ error: "not found" });
    } finally {
      await server.stop();
    }
  });

  it("handles rules read/write and unexpected backend exceptions", async () => {
    const backend = new EdgeBackend();
    const logger = new Logger("debug", "test");
    const loggerSpy = jest.spyOn(logger, "error").mockImplementation(() => undefined);
    const port = nextPort();
    const server = new ControlApiServer(port, backend, new RuleEngineService(), logger, null);
    try {
      await server.start();

      const rulesBefore = await requestJson(port, "GET", "/api/v2/rules");
      expect(rulesBefore.statusCode).toBe(200);
      expect(rulesBefore.payload).toEqual({
        rules: expect.objectContaining({
          mode: "manual",
          minimumHoldSeconds: 60,
          temperatureTargetC: 24,
          temperatureBandC: 0.5,
          humidityTargetPercent: 45,
          humidityBandPercent: 3
        })
      });
      expect((rulesBefore.payload as { rules: { updatedAtEpochSeconds: unknown } }).rules.updatedAtEpochSeconds).toEqual(expect.any(Number));

      const rulesAfter = await requestJson(port, "POST", "/api/v2/rules", {
        humidityBandPercent: 5
      });
      expect(rulesAfter.statusCode).toBe(200);
      expect(rulesAfter.payload).toEqual({
        rules: expect.objectContaining({
          mode: "manual",
          humidityBandPercent: 5
        })
      });
      expect((rulesAfter.payload as { rules: { updatedAtEpochSeconds: unknown } }).rules.updatedAtEpochSeconds).toEqual(expect.any(Number));

      backend.throwStatus = true;
      const failedStatus = await requestJson(port, "GET", "/api/v2/status");
      expect(failedStatus.statusCode).toBe(500);
      expect(failedStatus.payload).toEqual({ error: "internal server error" });
      expect(loggerSpy).toHaveBeenCalledWith(
        "control api request failed",
        expect.objectContaining({ error_message: "status boom" })
      );
    } finally {
      await server.stop();
    }
  });
});