import { describe, it, expect } from 'vitest';
import {
  getSuggestedPrepTime,
  getTotalPrepMinutes,
  getPrepStartTime,
  formatPrepWarning,
  shouldShowPrepWarning,
  getPrepKeywords,
} from './prep-time';

describe('getSuggestedPrepTime', () => {
  it('returns keyword-based config for "meeting"', () => {
    const config = getSuggestedPrepTime('Team Meeting');
    expect(config.prepMinutes).toBe(10);
    expect(config.message).toContain('agenda');
  });

  it('returns keyword-based config for "flight"', () => {
    const config = getSuggestedPrepTime('Flight to NYC');
    expect(config.prepMinutes).toBe(60);
    expect(config.travelMinutes).toBe(60);
  });

  it('returns keyword-based config for "dentist"', () => {
    const config = getSuggestedPrepTime('Dentist appointment');
    expect(config.prepMinutes).toBe(15);
    expect(config.travelMinutes).toBe(20);
  });

  it('returns keyword-based config for "interview"', () => {
    const config = getSuggestedPrepTime('Job Interview');
    expect(config.prepMinutes).toBe(30);
  });

  it('returns keyword-based config for "gym"', () => {
    const config = getSuggestedPrepTime('Go to gym');
    expect(config.prepMinutes).toBe(10);
    expect(config.travelMinutes).toBe(10);
  });

  it('returns keyword-based config for "exam"', () => {
    const config = getSuggestedPrepTime('Math Exam');
    expect(config.prepMinutes).toBe(30);
  });

  it('falls back to category default when no keyword match', () => {
    const config = getSuggestedPrepTime('Random task', 'cooking');
    expect(config.prepMinutes).toBe(15);
    expect(config.message).toContain('ingredients');
  });

  it('returns generic default when no keyword or category match', () => {
    const config = getSuggestedPrepTime('Something');
    expect(config.prepMinutes).toBe(5);
    expect(config.travelMinutes).toBe(0);
  });

  it('keyword takes priority over category', () => {
    const config = getSuggestedPrepTime('Flight to LA', 'personal');
    expect(config.prepMinutes).toBe(60); // keyword "flight", not category "personal" (5)
  });

  it('handles case-insensitive matching', () => {
    const config = getSuggestedPrepTime('PRESENTATION at work');
    expect(config.prepMinutes).toBe(20);
  });
});

describe('getTotalPrepMinutes', () => {
  it('sums prep and travel', () => {
    expect(getTotalPrepMinutes({ prepMinutes: 10, travelMinutes: 20, message: '' })).toBe(30);
  });

  it('handles zero travel', () => {
    expect(getTotalPrepMinutes({ prepMinutes: 15, travelMinutes: 0, message: '' })).toBe(15);
  });
});

describe('getPrepStartTime', () => {
  it('calculates correct start time', () => {
    const target = 1000 * 60 * 60; // 1 hour in ms
    const config = { prepMinutes: 10, travelMinutes: 5, message: '' };
    const start = getPrepStartTime(target, config);
    expect(start).toBe(target - 15 * 60_000);
  });
});

describe('formatPrepWarning', () => {
  const config = { prepMinutes: 10, travelMinutes: 5, message: 'Review your agenda' };

  it('returns "Time\'s up" when no time left', () => {
    expect(formatPrepWarning(config, 0)).toContain("Time's up");
  });

  it('returns "Start now" when within total prep window', () => {
    expect(formatPrepWarning(config, 10)).toContain('Start now');
  });

  it('returns "Prepare soon" when close to prep start', () => {
    expect(formatPrepWarning(config, 18)).toContain('Prepare soon');
  });

  it('returns prep start countdown when far away', () => {
    expect(formatPrepWarning(config, 60)).toContain('prep starts in 45m');
  });
});

describe('shouldShowPrepWarning', () => {
  const config = { prepMinutes: 10, travelMinutes: 5, message: '' };
  const target = Date.now() + 60 * 60_000; // 1 hour from now

  it('returns false when too early', () => {
    const earlyNow = target - 90 * 60_000; // 90 min before
    expect(shouldShowPrepWarning(target, config, earlyNow)).toBe(false);
  });

  it('returns true within prep window', () => {
    const inPrepWindow = target - 10 * 60_000; // 10 min before (within 15m window)
    expect(shouldShowPrepWarning(target, config, inPrepWindow)).toBe(true);
  });

  it('returns false after target time', () => {
    const afterTarget = target + 60_000;
    expect(shouldShowPrepWarning(target, config, afterTarget)).toBe(false);
  });

  it('returns true exactly at prep start', () => {
    const prepStart = target - 15 * 60_000;
    expect(shouldShowPrepWarning(target, config, prepStart)).toBe(true);
  });
});

describe('getPrepKeywords', () => {
  it('returns an array of keyword strings', () => {
    const keywords = getPrepKeywords();
    expect(keywords.length).toBeGreaterThan(10);
    expect(keywords).toContain('meeting');
    expect(keywords).toContain('flight');
    expect(keywords).toContain('dentist');
  });
});