import { describe, expect, test } from "bun:test";
import { mkdir, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";

import { loadServerConfig, parseRuntimeArgs, parseSize } from "../../src/server/config";
import { APP } from "../../src/shared/app";

describe("parseRuntimeArgs", () => {
  test("无参数抛出需要配置文件路径错误", () => {
    try {
      parseRuntimeArgs([]);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("需要指定 YAML 配置文件路径");
    }
  });

  test("有参数返回 configPath", () => {
    const result = parseRuntimeArgs(["config.yaml"]);
    expect(result).toEqual({ configPath: "config.yaml" });
  });

  test("--help 抛出错误", () => {
    try {
      parseRuntimeArgs(["--help"]);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("用法");
    }
  });

  test("-h 抛出错误", () => {
    try {
      parseRuntimeArgs(["-h"]);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("用法");
    }
  });
});

describe("parseSize", () => {
  test("解析数字字节值", () => {
    expect(parseSize(1024)).toBe(1024);
  });

  test("解析字符串大小", () => {
    expect(parseSize("1KB")).toBe(1024);
    expect(parseSize("50MB")).toBe(52428800);
    expect(parseSize("1GB")).toBe(1073741824);
    expect(parseSize("1024B")).toBe(1024);
  });

  test("非法格式抛出错误", () => {
    try {
      parseSize("invalid");
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("无效的 size 格式");
    }
  });
});

describe("loadServerConfig", () => {
  test("YAML 配置文件不存在时报错", async () => {
    try {
      await loadServerConfig("/nonexistent/path/config.yaml");
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("配置文件不存在");
    }
  });

  test("最简配置解析成功", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "minimal.yaml");
    await writeFile(yamlPath, 'server:\n  listen:\n    host: "0.0.0.0"\n    port: 9999\n');

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.host).toBe("0.0.0.0");
      expect(result.port).toBe(9999);
      expect(result.configDir).toBe(temp);
      expect(result.dataDir).toBe(join(temp, "data"));
      expect(result.logging.filePath).toBe(join(temp, "data", "logs", `${APP.name}.log`));
      expect(result.logging.consoleLevel).toBe("info");
      expect(result.logging.fileLevel).toBe("info");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("旧布局 server.host/server.port 被拒绝", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "test-old-layout.yaml");
    const yamlContent = 'server:\n  host: "0.0.0.0"\n  port: 9999\n';
    await writeFile(yamlPath, yamlContent);

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("未知字段");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("非法端口被拒绝", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "test-bad-port.yaml");
    await writeFile(yamlPath, "server:\n  listen:\n    port: 99999\n");

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toBeTruthy();
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("显式变量引用环境变量生效", async () => {
    const prevHost = process.env["HOST"];
    const prevPort = process.env["PORT"];
    process.env["HOST"] = "10.0.0.1";
    process.env["PORT"] = "4000";

    const temp = tmpdir();
    const yamlPath = join(temp, "test-env-var.yaml");
    await writeFile(yamlPath, 'server:\n  listen:\n    host: "${HOST}"\n    port: ${PORT}\n');

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.host).toBe("10.0.0.1");
      expect(result.port).toBe(4000);
    } finally {
      await rm(yamlPath, { force: true });
      if (prevHost === undefined) delete process.env["HOST"];
      else process.env["HOST"] = prevHost;
      if (prevPort === undefined) delete process.env["PORT"];
      else process.env["PORT"] = prevPort;
    }
  });

  test("变量带默认值生效", async () => {
    delete process.env["MY_HOST"];
    const temp = tmpdir();
    const yamlPath = join(temp, "test-default.yaml");
    await writeFile(yamlPath, 'server:\n  listen:\n    host: "${MY_HOST|0.0.0.0}"\n    port: ${MY_PORT|5000}\n');

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.host).toBe("0.0.0.0");
      expect(result.port).toBe(5000);
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("绝对 dataDir 保持不变", async () => {
    const temp = tmpdir();
    const dataDir = join(temp, "absolute-data");
    await mkdir(dataDir, { recursive: true });
    const yamlPath = join(temp, "absolute-dir.yaml");
    await writeFile(yamlPath, `server:\n  storage:\n    dataDir: ${JSON.stringify(dataDir)}\n`);

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.dataDir).toBe(dataDir);
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("相对 dataDir 基于 configDir", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "rel-dir.yaml");
    await writeFile(yamlPath, 'server:\n  storage:\n    dataDir: "./my-data"\n');

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.dataDir).toBe(join(temp, "my-data"));
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("显式相对日志路径基于 configDir", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "log-path.yaml");
    await writeFile(yamlPath, 'server:\n  logging:\n    file:\n      path: "./logs/app.log"\n');

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.logging.filePath).toBe(join(temp, "logs", "app.log"));
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("绝对日志路径保持不变", async () => {
    const temp = tmpdir();
    const logPath = join(temp, "my-app.log");
    const yamlPath = join(temp, "abs-log.yaml");
    await writeFile(yamlPath, `server:\n  logging:\n    file:\n      path: ${JSON.stringify(logPath)}\n`);

    try {
      const result = await loadServerConfig(yamlPath);
      expect(result.logging.filePath).toBe(logPath);
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("非法 logging.level 抛出错误", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "bad-level.yaml");
    await writeFile(yamlPath, 'server:\n  logging:\n    level: "invalid"\n');

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("日志等级");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("空白 logging.file.path 抛出错误", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "blank-path.yaml");
    await writeFile(yamlPath, 'server:\n  logging:\n    file:\n      path: "  "\n');

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("日志路径不能为空字符串或空白字符串");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("非法 rotation.size 抛出错误", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "bad-size.yaml");
    await writeFile(yamlPath, 'server:\n  logging:\n    file:\n      rotation:\n        size: "99XX"\n');

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("无效的 size 格式");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("非法 rotation.frequency 抛出错误", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "bad-freq.yaml");
    await writeFile(yamlPath, 'server:\n  logging:\n    file:\n      rotation:\n        frequency: "yearly"\n');

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("rotation.frequency");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });

  test("非法 rotation.maxFiles 抛出错误", async () => {
    const temp = tmpdir();
    const yamlPath = join(temp, "bad-max.yaml");
    await writeFile(yamlPath, "server:\n  logging:\n    file:\n      rotation:\n        maxFiles: 0\n");

    try {
      await loadServerConfig(yamlPath);
      expect.unreachable();
    } catch (error) {
      expect((error as Error).message).toContain("maxFiles");
    } finally {
      await rm(yamlPath, { force: true });
    }
  });
});