import { describe, expect, it } from "vitest";
import { buildApp } from "../src/app.js";
import { loadConfig } from "../src/config.js";
import { repos, type Db } from "@cfdm/db";
import * as healthCheckService from "../src/services/health-check-service.js";
import {
  buildMeasurementBody,
  summarizeMeasurement,
} from "../src/lib/globalping-client.js";
import { aggregateHealthOk } from "@cfdm/shared";
import type { HealthCheckTarget } from "@cfdm/shared";

const thresholds = {
  degradedFailures: 1,
  downFailures: 2,
  latencyWarnMs: 1000,
  successRecoveries: 2,
};

function tcpTarget(overrides?: Partial<HealthCheckTarget>): HealthCheckTarget {
  return {
    scope: "binding",
    ref_id: 1,
    ip: "203.0.113.10",
    hostname: "panel.example.com",
    type: "tcp",
    port: 443,
    path: null,
    expected_status: null,
    timeout_ms: 400,
    verify_tls: false,
    provider: "globalping",
    providers: ["globalping"],
    aggregate: "majority",
    ...overrides,
  };
}

async function seedBinding(
  db: Db,
  opts: {
    ip: string;
    providers: Array<"local" | "cloudflare" | "globalping">;
    aggregate?: "any" | "all" | "majority";
    port?: number;
  },
) {
  const domain = repos.createDomain(db, null, "example.com", "zone-1");
  const service = repos.createService(db, "Panel", "panel");
  repos.setServiceEnabled(db, service.id, true);
  repos.replaceServiceIps(db, service.id, [opts.ip]);
  const binding = repos.insertBinding(db, domain.id, service.id, "panel", null);
  repos.replaceBindingIpsWithMeta(db, binding.id, [
    { ip: opts.ip, weight: 1, priority: 1 },
  ]);
  repos.updateBindingLbConfig(db, binding.id, {
    health_check_enabled: true,
    health_check_type: "tcp",
    health_check_port: opts.port ?? 1,
    health_check_timeout_ms: 400,
    health_check_providers: opts.providers,
    health_check_aggregate: opts.aggregate ?? "majority",
  });
  return { service, binding, domain };
}

function mockFetch(handler: (url: string, init?: RequestInit) => Response): typeof fetch {
  return (async (input: RequestInfo | URL, init?: RequestInit) => {
    const url = typeof input === "string" ? input : input instanceof URL ? input.href : input.url;
    return handler(url, init);
  }) as typeof fetch;
}

describe("aggregateHealthOk", () => {
  it("any / all / majority", () => {
    expect(aggregateHealthOk([true, false], "any")).toBe(false);
    expect(aggregateHealthOk([true, false], "all")).toBe(true);
    expect(aggregateHealthOk([true, false], "majority")).toBe(true);
    expect(aggregateHealthOk([false, false], "majority")).toBe(false);
    expect(aggregateHealthOk([true, false, false], "majority")).toBe(false);
    expect(aggregateHealthOk([true, true, false], "majority")).toBe(true);
    expect(aggregateHealthOk([true], "majority")).toBe(true);
  });
});

describe("globalping mapping", () => {
  it("maps CFDM TCP to ping+TCP and HTTP to http+host", () => {
    const tcp = buildMeasurementBody(tcpTarget(), { limit: 3, locations: "World" });
    expect(tcp.type).toBe("ping");
    expect(tcp.measurementOptions.protocol).toBe("TCP");
    expect(tcp.measurementOptions.port).toBe(443);
    expect(tcp.inProgressUpdates).toBe(false);

    const http = buildMeasurementBody(
      tcpTarget({ type: "http", port: 443, path: "/health", expected_status: 200 }),
      { limit: 2, locations: "EU,US" },
    );
    expect(http.type).toBe("http");
    expect(http.locations).toEqual([{ magic: "EU" }, { magic: "US" }]);
    expect(http.measurementOptions.request).toMatchObject({
      host: "panel.example.com",
      path: "/health",
      method: "GET",
    });
  });

  it("summarizes HTTP majority and TCP packet loss", () => {
    const httpOk = summarizeMeasurement(
      tcpTarget({ type: "http", expected_status: 200 }),
      {
        status: "finished",
        results: [
          { probe: { city: "Frankfurt", country: "DE" }, result: { status: "finished", statusCode: 200, timings: { total: 40 } } },
          { probe: { city: "London", country: "GB" }, result: { status: "finished", statusCode: 200, timings: { total: 50 } } },
          { probe: { city: "Paris", country: "FR" }, result: { status: "finished", statusCode: 500, timings: { total: 20 } } },
        ],
      },
    );
    expect(httpOk.ok).toBe(true);
    expect(httpOk.colo).toBe("Frankfurt, DE");

    const tcpFail = summarizeMeasurement(tcpTarget(), {
      status: "finished",
      results: [
        { result: { status: "finished", stats: { avg: 12, loss: 100 } } },
        { result: { status: "finished", stats: { avg: 11, loss: 100 } } },
      ],
    });
    expect(tcpFail.ok).toBe(false);
  });
});

describe("globalping engine", () => {
  it("POST 202 + GET finished writes colo from probe city", async () => {
    const app = await buildApp({
      config: { ...loadConfig(), staticDir: null },
      memory: true,
    });
    const { binding } = await seedBinding(app.db, {
      ip: "203.0.113.40",
      providers: ["globalping"],
      port: 443,
    });
    const fetchImpl = mockFetch((url) => {
      if (url.endsWith("/v1/measurements")) {
        return new Response(JSON.stringify({ id: "meas-1" }), { status: 202 });
      }
      return new Response(
        JSON.stringify({
          id: "meas-1",
          status: "finished",
          results: [
            {
              probe: { city: "Amsterdam", country: "NL" },
              result: { status: "finished", stats: { avg: 18, loss: 0 } },
            },
            {
              probe: { city: "Frankfurt", country: "DE" },
              result: { status: "finished", stats: { avg: 22, loss: 0 } },
            },
          ],
        }),
        { status: 200 },
      );
    });
    await healthCheckService.runAllChecks(app.db, {
      thresholds,
      probeGapMs: 0,
      globalping: {
        token: "gp_test",
        locations: "World",
        limit: 2,
        pollIntervalMs: 0,
        fetchImpl,
      },
    });
    const row = repos.getIpHealthStatusRow(
      app.db,
      "binding",
      binding.id,
      "203.0.113.40",
    );
    expect(row?.status).toBe("up");
    expect(row?.provider).toBe("globalping");
    expect(row?.colo).toMatch(/Amsterdam/);
    await app.close();
  });

  it("429 fails the source and does not fall back to local", async () => {
    const app = await buildApp({
      config: { ...loadConfig(), staticDir: null },
      memory: true,
    });
    const { binding } = await seedBinding(app.db, {
      ip: "127.0.0.1",
      providers: ["globalping"],
      port: 1,
    });
    const fetchImpl = mockFetch(() => new Response("rate limited", { status: 429 }));
    await healthCheckService.runAllChecks(app.db, {
      thresholds,
      probeGapMs: 0,
      globalping: {
        token: "gp_test",
        locations: "World",
        limit: 1,
        pollIntervalMs: 0,
        fetchImpl,
      },
    });
    const row = repos.getIpHealthStatusRow(
      app.db,
      "binding",
      binding.id,
      "127.0.0.1",
    );
    expect(row?.last_error).toMatch(/429/i);
    expect(row?.provider).toBe("globalping");
    await app.close();
  });

  it("local+globalping all keeps IP up if Globalping is ok", async () => {
    const app = await buildApp({
      config: { ...loadConfig(), staticDir: null },
      memory: true,
    });
    const { binding, service } = await seedBinding(app.db, {
      ip: "127.0.0.1",
      providers: ["local", "globalping"],
      aggregate: "all",
      port: 1,
    });
    const fetchImpl = mockFetch((url) => {
      if (url.endsWith("/v1/measurements")) {
        return new Response(JSON.stringify({ id: "meas-2" }), { status: 202 });
      }
      return new Response(
        JSON.stringify({
          status: "finished",
          results: [
            { probe: { city: "Vienna", country: "AT" }, result: { status: "finished", stats: { avg: 9, loss: 0 } } },
          ],
        }),
        { status: 200 },
      );
    });
    await healthCheckService.runAllChecks(app.db, {
      thresholds,
      probeGapMs: 0,
      globalping: {
        token: "gp_test",
        locations: "World",
        limit: 1,
        pollIntervalMs: 0,
        fetchImpl,
      },
    });
    const row = repos.getIpHealthStatusRow(
      app.db,
      "binding",
      binding.id,
      "127.0.0.1",
    );
    expect(row?.status).toBe("up");
    expect(row?.provider).toBe("aggregate");
    const logs = repos.listHealthProbeLogForService(app.db, service.id);
    expect(logs.map((row) => row.provider).sort()).toEqual([
      "globalping",
      "local",
    ]);
    await app.close();
  });
});