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

import type { ResolvedCommandTarget } from "../../../src/server/checker/runner/cmd/types";
import type { ResolvedHttpTarget } from "../../../src/server/checker/runner/http/types";
import type { ProbeStore } from "../../../src/server/checker/store";
import type { ResolvedTargetBase } from "../../../src/server/checker/types";

import { ProbeEngine } from "../../../src/server/checker/engine";
import { checkerRegistry } from "../../../src/server/checker/runner";
import { CommandChecker } from "../../../src/server/checker/runner/cmd/execute";
import { HttpChecker } from "../../../src/server/checker/runner/http/execute";
import { createMemoryLogger } from "../../../src/server/logger";

const processEnv = Object.fromEntries(
  Object.entries(process.env).filter((entry): entry is [string, string] => entry[1] !== undefined),
);

function createMockStore(targetNames: string[]) {
  const targets = targetNames.map((name) => ({ id: name, name }));
  const results: Array<Record<string, unknown>> = [];

  return {
    _results: results,
    getLatestChecksMap() {
      return new Map();
    },
    getTargets() {
      return targets.map(({ id, name }) => ({
        config: "",
        expect: null,
        grp: "default",
        id,
        interval_ms: 60000,
        name,
        target: "",
        timeout_ms: 5000,
        type: "cmd" as const,
      }));
    },
    insertCheckResult(result: Record<string, unknown>) {
      results.push(result);
    },
  };
}

function ensureRegistered() {
  if (!checkerRegistry.supportedTypes.includes("http")) {
    checkerRegistry.register(new HttpChecker());
    checkerRegistry.register(new CommandChecker());
  }
}

function makeCommandTarget(name: string, overrides?: Partial<ResolvedCommandTarget>): ResolvedCommandTarget {
  return {
    cmd: {
      args: ["-e", "console.log('hello')"],
      cwd: process.cwd(),
      env: processEnv,
      exec: "bun",
      maxOutputBytes: 1024 * 1024,
    },
    description: null,
    group: "default",
    id: name,
    intervalMs: 60000,
    name,
    timeoutMs: 5000,
    type: "cmd",
    ...overrides,
  };
}

describe("ProbeEngine", () => {
  test("start/stop 不抛错", () => {
    ensureRegistered();
    const mockStore = createMockStore(["test"]) as unknown as ProbeStore;
    const targets: ResolvedTargetBase[] = [makeCommandTarget("test")];
    const engine = new ProbeEngine(mockStore, targets);
    engine.start();
    engine.stop();
    expect(true).toBe(true);
  });

  test("单次 probeGroup 执行 cmd 检查", async () => {
    const target = makeCommandTarget("cmd-echo");
    const mockStore = createMockStore(["cmd-echo"]) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, [target]);

    const probeGroup = (
      engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
    ).probeGroup.bind(engine);
    await probeGroup([target]);

    const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
    expect(results.length).toBe(1);
    expect(results[0]!["matched"]).toBe(true);
    expect((results[0]!["observation"] as Record<string, unknown>)["exitCode"]).toBe(0);
  });

  test("多个目标并发执行", async () => {
    const targetA = makeCommandTarget("echo-a", {
      cmd: {
        args: ["-e", "console.log('a')"],
        cwd: process.cwd(),
        env: processEnv,
        exec: "bun",
        maxOutputBytes: 1024 * 1024,
      },
    });
    const targetB = makeCommandTarget("echo-b", {
      cmd: {
        args: ["-e", "console.log('b')"],
        cwd: process.cwd(),
        env: processEnv,
        exec: "bun",
        maxOutputBytes: 1024 * 1024,
      },
    });

    const mockStore = createMockStore(["echo-a", "echo-b"]) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, [targetA, targetB]);

    const probeGroup = (
      engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
    ).probeGroup.bind(engine);
    await probeGroup([targetA, targetB]);

    const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
    expect(results.length).toBe(2);
  });

  test("失败目标不阻塞其他目标", async () => {
    const badTarget = makeCommandTarget("bad-cmd", {
      cmd: {
        args: ["-e", "process.exit(1)"],
        cwd: process.cwd(),
        env: processEnv,
        exec: "bun",
        maxOutputBytes: 1024 * 1024,
      },
    });
    const goodTarget = makeCommandTarget("good-cmd");

    const mockStore = createMockStore(["bad-cmd", "good-cmd"]) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, [badTarget, goodTarget]);

    const probeGroup = (
      engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
    ).probeGroup.bind(engine);
    await probeGroup([badTarget, goodTarget]);

    const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
    expect(results.length).toBe(2);

    const badResult = results.find((r) => r["matched"] === false);
    const goodResult = results.find((r) => r["matched"] === true);
    expect(badResult).toBeDefined();
    expect(goodResult).toBeDefined();
  });

  test("checker rejected 时写入 internal error 结果", async () => {
    ensureRegistered();
    const checker = checkerRegistry.get("cmd");
    const originalExecute = checker.execute.bind(checker);
    checker.execute = async (target, ctx) => {
      if (target.name === "reject-cmd") {
        throw new Error("boom");
      }
      return originalExecute(target, ctx);
    };

    const rejectTarget = makeCommandTarget("reject-cmd");
    const goodTarget = makeCommandTarget("good-cmd");
    const mockStore = createMockStore(["reject-cmd", "good-cmd"]) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, [rejectTarget, goodTarget]);

    const probeGroup = (
      engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
    ).probeGroup.bind(engine);
    await probeGroup([rejectTarget, goodTarget]);

    const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
    expect(results.length).toBe(2);
    expect(results[0]!["targetId"]).toBe("reject-cmd");
    expect(results[0]!["matched"]).toBe(false);
    expect(results[0]!["durationMs"]).toBeNull();
    expect(results[0]!["observation"]).toBeNull();
    expect(results[0]!["failure"]).toEqual({
      kind: "error",
      message: "boom",
      path: "engine",
      phase: "internal",
    });
    expect(typeof results[0]!["timestamp"]).toBe("string");
    expect(results[1]!["targetId"]).toBe("good-cmd");
    expect(results[1]!["matched"]).toBe(true);
    checker.execute = originalExecute;
  });

  test("并发限制 maxConcurrentChecks", async () => {
    const targets = Array.from({ length: 5 }, (_, i) =>
      makeCommandTarget(`cmd-${i}`, {
        cmd: {
          args: ["-e", `console.log('${i}')`],
          cwd: process.cwd(),
          env: processEnv,
          exec: "bun",
          maxOutputBytes: 1024 * 1024,
        },
      }),
    );

    const mockStore = createMockStore(targets.map((t) => t.name ?? t.id)) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, targets, 2);

    const probeGroup = (
      engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
    ).probeGroup.bind(engine);
    await probeGroup(targets);

    const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
    expect(results.length).toBe(5);
    for (const r of results) {
      expect(r["matched"]).toBe(true);
    }
  });

  test("groupByInterval 按间隔分组", () => {
    const targetA = makeCommandTarget("a", { intervalMs: 30000 });
    const targetB = makeCommandTarget("b", { intervalMs: 30000 });
    const targetC = makeCommandTarget("c", { intervalMs: 60000 });

    const mockStore = createMockStore(["a", "b", "c"]) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, [targetA, targetB, targetC]);
    engine.start();
    engine.stop();
    expect(true).toBe(true);
  });

  test("未注册的 target id 不写入结果", async () => {
    const target = makeCommandTarget("unknown-target");
    const mockStore = createMockStore(["other-name"]) as unknown as ProbeStore;
    const engine = new ProbeEngine(mockStore, [target]);

    const probeGroup = (
      engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
    ).probeGroup.bind(engine);
    await probeGroup([target]);

    const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
    expect(results.length).toBe(0);
  });

  test("HTTP 目标运行", async () => {
    const httpServer = Bun.serve({
      fetch() {
        return new Response("ok");
      },
      port: 0,
    });

    try {
      const httpTarget: ResolvedHttpTarget = {
        description: null,
        group: "default",
        http: {
          headers: {},
          ignoreSSL: false,
          maxBodyBytes: 1024 * 1024,
          maxRedirects: 0,
          method: "GET",
          url: `http://localhost:${httpServer.port}/`,
        },
        id: "http-test",
        intervalMs: 60000,
        name: "http-test",
        timeoutMs: 5000,
        type: "http",
      };

      const mockStore = createMockStore(["http-test"]) as unknown as ProbeStore;
      const engine = new ProbeEngine(mockStore, [httpTarget]);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([httpTarget]);

      const results = (mockStore as unknown as { _results: Array<Record<string, unknown>> })._results;
      expect(results.length).toBe(1);
      expect(results[0]!["matched"]).toBe(true);
      expect((results[0]!["observation"] as Record<string, unknown>)["statusCode"]).toBe(200);
    } finally {
      void httpServer.stop();
    }
  });

  test("retentionMs > 0 时 start 调用 prune", () => {
    let pruneCalled = false;
    const mockStore = {
      ...createMockStore(["test"]),
      prune() {
        pruneCalled = true;
        return 0;
      },
    } as unknown as ProbeStore;

    const targets: ResolvedTargetBase[] = [makeCommandTarget("test")];
    const engine = new ProbeEngine(mockStore, targets, 20, 86400000);
    engine.start();
    expect(pruneCalled).toBe(true);
    engine.stop();
  });

  test("retentionMs = 0 时不调用 prune", () => {
    let pruneCalled = false;
    const mockStore = {
      ...createMockStore(["test"]),
      prune() {
        pruneCalled = true;
        return 0;
      },
    } as unknown as ProbeStore;

    const targets: ResolvedTargetBase[] = [makeCommandTarget("test")];
    const engine = new ProbeEngine(mockStore, targets, 20, 0);
    engine.start();
    expect(pruneCalled).toBe(false);
    engine.stop();
  });

  test("retentionMs 未传时不调用 prune", () => {
    let pruneCalled = false;
    const mockStore = {
      ...createMockStore(["test"]),
      prune() {
        pruneCalled = true;
        return 0;
      },
    } as unknown as ProbeStore;

    const targets: ResolvedTargetBase[] = [makeCommandTarget("test")];
    const engine = new ProbeEngine(mockStore, targets);
    engine.start();
    expect(pruneCalled).toBe(false);
    engine.stop();
  });

  describe("日志与状态变化", () => {
    test("checker rejected 时 logger 记录 error", async () => {
      ensureRegistered();
      const checker = checkerRegistry.get("cmd");
      const originalExecute = checker.execute.bind(checker);
      checker.execute = async (target, ctx) => {
        if (target.id === "fail-target") throw new Error("explode");
        return originalExecute(target, ctx);
      };

      const logger = createMemoryLogger();
      const mockStore = createMockStore(["fail-target", "ok-target"]) as unknown as ProbeStore;
      const engine = new ProbeEngine(
        mockStore,
        [makeCommandTarget("fail-target"), makeCommandTarget("ok-target")],
        20,
        0,
        logger,
      );

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget("fail-target"), makeCommandTarget("ok-target")]);

      const errorLogs = logger.entries.filter((e) => e.level === "error");
      expect(errorLogs.length).toBeGreaterThanOrEqual(1);
      expect(errorLogs[0]!.msg).toContain("探针执行失败");

      checker.execute = originalExecute;
    });

    test("状态变化 UP→DOWN 记录 warn 日志", async () => {
      ensureRegistered();
      const logger = createMemoryLogger();
      const targetId = "state-test";
      const mockStore = {
        ...createMockStore([targetId]),
        getLatestChecksMap() {
          return new Map([[targetId, { matched: 1 }]]);
        },
      } as unknown as ProbeStore;

      const checker = checkerRegistry.get("cmd");
      const originalExecute = checker.execute.bind(checker);
      checker.execute = async (target) => {
        if (target.id === targetId) {
          return {
            detail: null,
            durationMs: 10,
            failure: { kind: "error", message: "fail", path: "exitCode", phase: "body" },
            matched: false,
            observation: null,
            targetId,
            timestamp: new Date().toISOString(),
          };
        }
        return originalExecute(target, { signal: new AbortController().signal });
      };

      const engine = new ProbeEngine(mockStore, [makeCommandTarget(targetId)], 20, 0, logger);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget(targetId)]);

      const stateLogs = logger.entries.filter((e) => e.level === "warn" && e.msg.includes("UP → DOWN"));
      expect(stateLogs.length).toBe(1);
      expect(stateLogs[0]!.msg).toContain(targetId);

      checker.execute = originalExecute;
    });

    test("状态变化 DOWN→UP 记录 info 日志", async () => {
      ensureRegistered();
      const logger = createMemoryLogger();
      const targetId = "recover-test";
      const mockStore = {
        ...createMockStore([targetId]),
        getLatestChecksMap() {
          return new Map([[targetId, { matched: 0 }]]);
        },
      } as unknown as ProbeStore;

      const engine = new ProbeEngine(mockStore, [makeCommandTarget(targetId)], 20, 0, logger);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget(targetId)]);

      const recoverLogs = logger.entries.filter((e) => e.level === "info" && e.msg.includes("DOWN → UP"));
      expect(recoverLogs.length).toBe(1);
      expect(recoverLogs[0]!.msg).toContain(targetId);
    });

    test("稳态 UP→UP 不产生状态变化日志", async () => {
      ensureRegistered();
      const logger = createMemoryLogger();
      const targetId = "steady-up";
      const mockStore = {
        ...createMockStore([targetId]),
        getLatestChecksMap() {
          return new Map([[targetId, { matched: 1 }]]);
        },
      } as unknown as ProbeStore;

      const engine = new ProbeEngine(mockStore, [makeCommandTarget(targetId)], 20, 0, logger);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget(targetId)]);

      const stateChangeLogs = logger.entries.filter(
        (e) => e.msg.includes("UP → DOWN") || e.msg.includes("DOWN → UP") || e.msg.includes("首次 DOWN"),
      );
      expect(stateChangeLogs.length).toBe(0);
    });

    test("首次检查 DOWN 记录 warn 日志", async () => {
      ensureRegistered();
      const logger = createMemoryLogger();
      const targetId = "first-down";
      const mockStore = createMockStore([targetId]) as unknown as ProbeStore;

      const checker = checkerRegistry.get("cmd");
      const originalExecute = checker.execute.bind(checker);
      checker.execute = async (target) => {
        if (target.id === targetId) {
          return {
            detail: null,
            durationMs: 10,
            failure: { kind: "error", message: "fail", path: "exitCode", phase: "body" },
            matched: false,
            observation: null,
            targetId,
            timestamp: new Date().toISOString(),
          };
        }
        return originalExecute(target, { signal: new AbortController().signal });
      };

      const engine = new ProbeEngine(mockStore, [makeCommandTarget(targetId)], 20, 0, logger);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget(targetId)]);

      const firstDownLogs = logger.entries.filter((e) => e.level === "warn" && e.msg.includes("首次 DOWN"));
      expect(firstDownLogs.length).toBe(1);

      checker.execute = originalExecute;
    });

    test("每次检查产出 debug 日志", async () => {
      ensureRegistered();
      const logger = createMemoryLogger();
      const targetId = "debug-target";
      const mockStore = createMockStore([targetId]) as unknown as ProbeStore;

      const engine = new ProbeEngine(mockStore, [makeCommandTarget(targetId)], 20, 0, logger);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget(targetId)]);

      const debugLogs = logger.entries.filter((e) => e.level === "debug");
      expect(debugLogs.length).toBeGreaterThanOrEqual(1);
      const first = debugLogs[0]!;
      expect(first.obj).toBeDefined();
      expect(first.obj!["targetId"]).toBe(targetId);
    });

    test("无 logger 时不抛错（noop logger 兜底）", async () => {
      ensureRegistered();
      const mockStore = createMockStore(["no-log"]) as unknown as ProbeStore;
      const engine = new ProbeEngine(mockStore, [makeCommandTarget("no-log")]);

      const probeGroup = (
        engine as unknown as { probeGroup: (t: ResolvedTargetBase[]) => Promise<void> }
      ).probeGroup.bind(engine);
      await probeGroup([makeCommandTarget("no-log")]);
    });
  });
});