import { describe, it, expect } from 'vitest';
import {
  computeNetScore,
  clamp01,
  clampRange,
  luminanceFromNetScore,
  addEntryToDay,
  updateEntryInDay,
  removeEntryFromDay,
  replaceEntriesForDay,
  recomputeDayNetScore
} from '../../src/compute';

import type { DayTile, HabitEntry } from '../../src/models';

function day(entries: HabitEntry[] = []): DayTile {
  return {
    date: '2025-01-01',
    mood: { hue: 180, intensity: 0.5 },
    entries,
    netScore: computeNetScore(entries)
  };
}

describe('compute helpers', () => {
  it('computes netScore correctly', () => {
    const entries: HabitEntry[] = [
      { id: '1', type: 'positive', habitId: 'h1', label: 'A', weight: 1, timestamp: new Date().toISOString() },
      { id: '2', type: 'positive', habitId: 'h2', label: 'B', weight: 2, timestamp: new Date().toISOString() },
      { id: '3', type: 'negative', habitId: 'h3', label: 'C', weight: 1, timestamp: new Date().toISOString() }
    ];
    expect(computeNetScore(entries)).toBe(1 + 2 - 1);
  });

  it('clamps values', () => {
    expect(clampRange(5, 0, 3)).toBe(3);
    expect(clampRange(-2, 0, 3)).toBe(0);
    expect(clamp01(2)).toBe(1);
    expect(clamp01(-1)).toBe(0);
  });

  it('maps luminance smoothly', () => {
    const lo = luminanceFromNetScore(-100);
    const hi = luminanceFromNetScore(100);
    const mid = luminanceFromNetScore(0);
    expect(lo).toBeGreaterThanOrEqual(0);
    expect(hi).toBeLessThanOrEqual(1);
    expect(hi).toBeGreaterThan(lo);
    expect(Math.abs(mid - 0.5)).toBeLessThan(1e-6);
  });

  it('recomputes on CRUD operations', () => {
    let d = day();
    d = addEntryToDay(d, { id: 'e1', type: 'positive', habitId: 'h1', label: 'A', weight: 2, timestamp: new Date().toISOString() });
    expect(d.netScore).toBe(2);
    d = addEntryToDay(d, { id: 'e2', type: 'negative', habitId: 'h2', label: 'B', weight: 1, timestamp: new Date().toISOString() });
    expect(d.netScore).toBe(1);
    d = updateEntryInDay(d, { id: 'e2', type: 'negative', habitId: 'h2', label: 'B', weight: 2, timestamp: new Date().toISOString() });
    expect(d.netScore).toBe(0);
    d = removeEntryFromDay(d, 'e1');
    expect(d.netScore).toBe(-2);
    d = replaceEntriesForDay(d, []);
    expect(d.netScore).toBe(0);
    expect(recomputeDayNetScore(d)).toBe(0);
  });
});