import type { Systeminformation } from "systeminformation";

import { describe, expect, test } from "bun:test";

import type { RawTargetConfig } from "../../../../../src/server/checker/types";

import { MemoryChecker } from "../../../../../src/server/checker/runner/memory/execute";

function makeMemData(overrides: Partial<Systeminformation.MemData> = {}): Systeminformation.MemData {
  return {
    active: 4294967296,
    available: 8589934592,
    buffcache: 1073741824,
    buffers: 536870912,
    cached: 536870912,
    dirty: null,
    free: 4294967296,
    reclaimable: 0,
    slab: 0,
    swapfree: 0,
    swaptotal: 0,
    swapused: 0,
    total: 17179869184,
    used: 8589934592,
    writeback: null,
    ...overrides,
  };
}

function makeResolveContext(
  overrides: Partial<{ configDir: string; defaultIntervalMs: number; defaultTimeoutMs: number }> = {},
) {
  return {
    configDir: "/test",
    defaultIntervalMs: 30000,
    defaultTimeoutMs: 10000,
    ...overrides,
  };
}

describe("MemoryChecker resolve", () => {
  const checker = new MemoryChecker();

  test("默认值：memory 为空对象", () => {
    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());
    expect(resolved.memory).toEqual({});
  });

  test("无 expect 时 expect 为 undefined", () => {
    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());
    expect(resolved.expect).toBeUndefined();
  });

  test("保留 expect 字段", () => {
    const target: RawTargetConfig = {
      expect: { usagePercent: { lte: 85 } },
      id: "mem-test",
      memory: {},
      type: "memory",
    };
    const resolved = checker.resolve(target, makeResolveContext());
    expect(resolved.expect).toEqual({ usagePercent: { lte: 85 } });
  });

  test("type 为 memory", () => {
    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());
    expect(resolved.type).toBe("memory");
  });
});

describe("MemoryChecker execute", () => {
  test("成功匹配", async () => {
    const data = makeMemData({ active: 4294967296, total: 8589934592 });
    const reader = () => Promise.resolve(data);
    const checker = new MemoryChecker(reader);

    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());
    resolved.expect = { usagePercent: { lte: 85 } };

    const ctx = { signal: new AbortController().signal };
    const result = await checker.execute(resolved, ctx);

    expect(result.matched).toBe(true);
    expect(result.failure).toBeNull();
    expect(result.observation).toMatchObject({
      totalBytes: 8589934592,
      usagePercent: 50,
    });
  });

  test("usagePercent mismatch", async () => {
    const data = makeMemData({ active: 7730941132, total: 8589934592 });
    const reader = () => Promise.resolve(data);
    const checker = new MemoryChecker(reader);

    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());
    resolved.expect = { usagePercent: { lte: 50 } };

    const ctx = { signal: new AbortController().signal };
    const result = await checker.execute(resolved, ctx);

    expect(result.matched).toBe(false);
    expect(result.failure?.phase).toBe("usage");
  });

  test("observation 包含所有字段", async () => {
    const data = makeMemData();
    const reader = () => Promise.resolve(data);
    const checker = new MemoryChecker(reader);

    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());

    const ctx = { signal: new AbortController().signal };
    const result = await checker.execute(resolved, ctx);

    const obs = result.observation!;
    expect(obs).toHaveProperty("activeBytes");
    expect(obs).toHaveProperty("activePercent");
    expect(obs).toHaveProperty("availableBytes");
    expect(obs).toHaveProperty("availablePercent");
    expect(obs).toHaveProperty("buffcacheBytes");
    expect(obs).toHaveProperty("freeBytes");
    expect(obs).toHaveProperty("freePercent");
    expect(obs).toHaveProperty("swapFreeBytes");
    expect(obs).toHaveProperty("swapTotalBytes");
    expect(obs).toHaveProperty("swapUsagePercent");
    expect(obs).toHaveProperty("swapUsedBytes");
    expect(obs).toHaveProperty("totalBytes");
    expect(obs).toHaveProperty("usagePercent");
    expect(obs).toHaveProperty("usedBytes");
    expect(obs).toHaveProperty("usedPercent");
  });

  test("reader reject 返回失败结果", async () => {
    const reader = () => Promise.reject(new Error("read error"));
    const checker = new MemoryChecker(reader);

    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());

    const ctx = { signal: new AbortController().signal };
    const result = await checker.execute(resolved, ctx);

    expect(result.matched).toBe(false);
    expect(result.failure?.phase).toBe("memory");
    expect(result.failure?.path).toBe("snapshot");
    expect(result.observation).toBeNull();
  });

  test("detail 格式", async () => {
    const data = makeMemData({ active: 4294967296, total: 8589934592 });
    const reader = () => Promise.resolve(data);
    const checker = new MemoryChecker(reader);

    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());

    const ctx = { signal: new AbortController().signal };
    const result = await checker.execute(resolved, ctx);

    const detail = checker.buildDetail(result.observation!);
    expect(detail).toContain("usage");
    expect(detail).toContain("%");
    expect(detail).toContain("total");
  });
});

describe("MemoryChecker serialize", () => {
  test("序列化输出", () => {
    const checker = new MemoryChecker();
    const target: RawTargetConfig = { id: "mem-test", memory: {}, type: "memory" };
    const resolved = checker.resolve(target, makeResolveContext());
    const result = checker.serialize(resolved);
    expect(result.target).toBe("memory");
    const config = JSON.parse(result.config) as Record<string, unknown>;
    expect(config).toEqual({});
  });
});