import { describe, it, expect } from "vitest";
import {
  formatDuration,
  formatTimestamp,
  truncateText,
  formatBytes,
} from "../../src/utils/formatting.js";

describe("formatDuration", () => {
  // Test: Validates duration formatting for seconds
  // Requirement: Output Formatting - Human-readable durations
  it("should format seconds correctly", () => {
    expect(formatDuration(30)).toBe("30s");
    expect(formatDuration(59)).toBe("59s");
  });

  // Test: Validates duration formatting for minutes
  // Requirement: Output Formatting - Human-readable durations
  it("should format minutes correctly", () => {
    expect(formatDuration(60)).toBe("1m");
    expect(formatDuration(90)).toBe("1m 30s");
    expect(formatDuration(120)).toBe("2m");
  });

  // Test: Validates duration formatting for hours
  // Requirement: Output Formatting - Human-readable durations
  it("should format hours correctly", () => {
    expect(formatDuration(3600)).toBe("1h");
    expect(formatDuration(3660)).toBe("1h 1m");
    expect(formatDuration(7200)).toBe("2h");
  });
});

describe("formatTimestamp", () => {
  // Test: Validates ISO 8601 timestamp formatting
  // Requirement: API Design - Timestamp format
  it("should format date as ISO 8601", () => {
    const date = new Date("2024-01-15T10:30:00Z");
    const result = formatTimestamp(date);

    expect(result).toBe("2024-01-15T10:30:00.000Z");
  });
});

describe("truncateText", () => {
  // Test: Validates text truncation with ellipsis
  // Requirement: Output Formatting - Text truncation
  it("should truncate long text with ellipsis", () => {
    const text = "This is a very long text that needs to be truncated";
    const result = truncateText(text, 20);

    expect(result).toBe("This is a very lo...");
    expect(result.length).toBe(20);
  });

  // Test: Validates handling of short text
  // Requirement: Output Formatting - Text truncation
  it("should not truncate short text", () => {
    const text = "Short text";
    const result = truncateText(text, 20);

    expect(result).toBe("Short text");
  });
});

describe("formatBytes", () => {
  // Test: Validates byte size formatting
  // Requirement: Output Formatting - File sizes
  it("should format bytes correctly", () => {
    expect(formatBytes(500)).toBe("500.0 B");
    expect(formatBytes(1024)).toBe("1.0 KB");
    expect(formatBytes(1536)).toBe("1.5 KB");
    expect(formatBytes(1048576)).toBe("1.0 MB");
    expect(formatBytes(1073741824)).toBe("1.0 GB");
  });
});