import { afterEach, beforeEach, expect, test, vi } from "vitest";
import { isReactive, watch } from "vue";
import { createPinia, setActivePinia } from "pinia";
import { formatLogValue, logCapacity, useLogStore } from "../src/stores/logs";

beforeEach(() => setActivePinia(createPinia()));
afterEach(() => {
  vi.useRealTimers();
  vi.unstubAllEnvs();
});

function backend(id: number, level = "INFO") {
  return { id, timestamp: "2026-10-07T10:00:00Z", source: "Go", level, message: `entry ${id}` };
}

test("records while collapsed and filters exact selected levels", () => {
  const logs = useLogStore();
  logs.add("DEBUG", "test", "debug");
  logs.add("INFO", "test", "info");
  logs.add("WARN", "test", "warning");
  logs.add("ERROR", "test", new Error("failure"));
  expect(logs.expanded).toBe(false);
  expect(logs.entries).toHaveLength(4);
  expect(logs.filtered).toHaveLength(3);
  expect(logs.errorCount).toBe(1);
  logs.levels = ["ERROR", "DEBUG"];
  expect(logs.filtered.map((entry) => entry.level)).toEqual(["DEBUG", "ERROR"]);
  logs.levels = [];
  expect(logs.filtered).toEqual([]);
});

test("history and live events are deduplicated and backend order is restored", () => {
  const logs = useLogStore();
  logs.ingest(backend(3));
  logs.ingest([backend(1), backend(2), backend(3)]);
  expect(logs.entries.map((entry) => entry.backendID)).toEqual([1, 2, 3]);
  logs.ingest(backend(2));
  expect(logs.entries).toHaveLength(3);
});

test("retains only the latest entries", () => {
  const logs = useLogStore();
  logs.ingest(Array.from({ length: logCapacity + 50 }, (_, i) => backend(i + 1)));
  expect(logs.entries).toHaveLength(logCapacity);
  expect(logs.entries[0].backendID).toBe(51);
  logs.add("ERROR", "test", "latest");
  expect(logs.entries).toHaveLength(logCapacity);
  expect(logs.entries.at(-1)?.message).toBe("latest");
});

test("clear prevents delayed history replay from restoring cleared entries", () => {
  const logs = useLogStore();
  logs.ingest(backend(10));
  logs.clear();
  logs.ingest([backend(5), backend(10), backend(11)]);
  expect(logs.entries.map((entry) => entry.backendID)).toEqual([11]);
  logs.add("ERROR", "test", "new error");
  expect(logs.errorCount).toBe(1);
  logs.clear();
  expect(logs.errorCount).toBe(0);
});

test("handles ERR, unknown levels and malformed events", () => {
  const logs = useLogStore();
  logs.ingest([null, {}, { ...backend(0) }, backend(1, "ERR"), backend(2, "unknown")]);
  expect(logs.entries.map((entry) => entry.level)).toEqual(["ERROR", "INFO"]);
});

test("formats exceptions, objects and circular console arguments", () => {
  expect(formatLogValue(new Error("failure"))).toContain("failure");
  expect(formatLogValue({ state: "error" })).toBe('{"state":"error"}');
  const circular: { self?: unknown } = {};
  circular.self = circular;
  expect(formatLogValue(circular)).toBe("[object Object]");
});

test("日志突发异步合并为一次界面更新，并保留容量内的顺序与错误", () => {
  vi.useFakeTimers();
  const logs = useLogStore();
  let publications = 0;
  const stop = watch(() => logs.entries, () => publications++, { flush: "sync" });
  for (let id = 4000; id > 0; id--) logs.enqueueBackendLogs(backend(id, id === 4000 ? "ERROR" : "DEBUG"));
  expect(logs.entries).toHaveLength(0);
  vi.runAllTimers();
  expect(publications).toBe(1);
  expect(logs.entries).toHaveLength(logCapacity);
  expect(logs.entries[0].backendID).toBe(2001);
  expect(logs.entries.at(-1)?.backendID).toBe(4000);
  expect(logs.errorCount).toBe(1);
  expect(isReactive(logs.entries[0])).toBe(false);
  const previous = logs.entries;
  logs.add("INFO", "test", "new entry");
  expect(previous.at(-1)?.backendID).toBe(4000);
  stop();
});

test("清空时取消待发布日志，延迟历史不会重新出现", () => {
  vi.useFakeTimers();
  const logs = useLogStore();
  logs.enqueueBackendLogs([backend(10), backend(11)]);
  logs.clear();
  logs.enqueueBackendLogs([backend(10), backend(11), backend(12)]);
  vi.runAllTimers();
  expect(logs.entries.map((entry) => entry.backendID)).toEqual([12]);
});

test("生产日志保留操作结果和异常，跳过 DEBUG 与 Go 运行时信息", () => {
  vi.stubEnv("DEV", false);
  vi.stubEnv("MODE", "production");
  const logs = useLogStore();
  const format = vi.fn(() => "debug details");
  logs.add("DEBUG", "performance", { toJSON: format });
  logs.ingest([
    backend(1, "DEBUG"), backend(2, "INFO"), backend(3, "WARN"), backend(4, "ERROR"),
    { ...backend(5, "INFO"), source: "archive:saved" },
    { ...backend(6, "INFO"), source: undefined },
  ]);
  expect(format).not.toHaveBeenCalled();
  expect(logs.entries.map((entry) => entry.backendID)).toEqual([3, 4, 5]);
});