import { describe, expect, it } from 'vitest';
import { calculateDay, type DayParticipant } from '../../src/domain/payroll/calculator.js';
import { requiredPeriods, validateRule } from '../../src/domain/payroll/rule.js';
import {
  b2bSalesPreset,
  cateringPreset,
  defaultParams,
  findRoleTemplate,
  payrollPresets,
  shiftWorkPreset,
} from '../../src/domain/payroll/presets.js';

const RUB = 100;

function roleParticipant(
  preset: (typeof payrollPresets)[number],
  roleCode: string,
  overrides: Partial<DayParticipant> & { hours: number },
): DayParticipant {
  const role = findRoleTemplate(preset, roleCode)!;
  const { hours, params, ...rest } = overrides;
  return {
    employeeId: 'employee',
    workedMinutes: Math.round(hours * 60),
    ruleCode: role.code,
    rule: role.rule,
    params: { ...defaultParams(role), ...(params ?? {}) },
    poolWeightBp: role.poolWeightBp,
    ...rest,
  };
}

function payRubles(
  participant: DayParticipant,
  options: {
    metrics?: Record<string, number>;
    windows?: Parameters<typeof calculateDay>[0]['windows'];
  } = {},
): number {
  const result = calculateDay({
    businessDate: '2026-05-01',
    orgUnitId: 'UNIT',
    metrics: options.metrics ?? {},
    shiftNormMinutes: 720,
    participants: [participant],
    ...(options.windows ? { windows: options.windows } : {}),
  });
  return result.lines[0]!.amountMinor / RUB;
}

describe('shift work: night, overtime and holiday hours', () => {
  it('adds twenty percent for night hours', () => {
    const guard = roleParticipant(shiftWorkPreset, 'shift_worker', {
      hours: 12,
      minutesByKind: { night: 8 * 60 },
    });
    // 3000 ₽ shift + 20% of (250 ₽ × 8 night hours) = 3000 + 400
    expect(payRubles(guard)).toBe(3400);
  });

  it('pays overtime at one and a half for two hours and double beyond', () => {
    const guard = roleParticipant(shiftWorkPreset, 'shift_worker', {
      hours: 16,
      minutesByKind: { overtime: 4 * 60 },
    });
    // 3000 ₽ shift + 250 × 2 × 0.5 + 250 × 2 × 1 = 3000 + 250 + 500
    expect(payRubles(guard)).toBe(3750);
  });

  it('adds a second rate for holiday hours', () => {
    const guard = roleParticipant(shiftWorkPreset, 'shift_worker', {
      hours: 12,
      minutesByKind: { holiday: 12 * 60 },
    });
    expect(payRubles(guard)).toBe(3000 + 250 * 12);
  });

  it('pays only the shift when there are no special hours', () => {
    const guard = roleParticipant(shiftWorkPreset, 'shift_worker', { hours: 12 });
    expect(payRubles(guard)).toBe(3000);
  });
});
describe('scales counted over a month, not over a day', () => {
  const manager = () => roleParticipant(b2bSalesPreset, 'sales_manager', { hours: 8 });

  it('reads the metric from the month window', () => {
    const pay = payRubles(manager(), {
      windows: { month: { metrics: { paid_margin_minor: 4_500_000 * RUB } } },
    });
    // 4000 ₽ shift + 2% of 2 000 000 + 4% of 1 000 000 + 6% of 1 000 000 + 8% of 500 000
    expect(pay).toBe(4_000 + 40_000 + 40_000 + 60_000 + 40_000);
  });

  it('pays only the shift rate while the month window is empty', () => {
    expect(payRubles(manager())).toBe(4_000);
  });

  it('reports which windows a rule needs', () => {
    const role = findRoleTemplate(b2bSalesPreset, 'sales_manager')!;
    expect([...requiredPeriods(role.rule)]).toEqual(['month']);
  });
});

describe('waiter: upsell count and average check', () => {
  const checks = [
    { amount_minor: 2_000 * RUB, category: 'main' },
    { amount_minor: 1_000 * RUB, category: 'dessert' },
    { amount_minor: 1_500 * RUB, category: 'dessert' },
  ];

  it('pays a percent of personal sales, per-item upsell and the average check bonus', () => {
    const waiter = roleParticipant(cateringPreset, 'waiter_upsell', { hours: 10, items: checks });
    // 2000 ₽ shift + 3% of 100 000 ₽ personal sales + 2 desserts × 40 ₽ + 500 ₽ (average check 1500 ₽)
    expect(payRubles(waiter, { metrics: { personal_sales_minor: 100_000 * RUB } })).toBe(
      2_000 + 3_000 + 80 + 500,
    );
  });

  it('withholds the average check bonus when the target is not met', () => {
    const waiter = roleParticipant(cateringPreset, 'waiter_upsell', {
      hours: 10,
      items: [{ amount_minor: 900 * RUB, category: 'main' }],
    });
    expect(payRubles(waiter, { metrics: { personal_sales_minor: 0 } })).toBe(2_000);
  });
});

describe('preset catalogue', () => {
  it('ships a validated rule for every role of every preset', () => {
    for (const preset of payrollPresets) {
      if (preset.poolRule) validateRule(preset.poolRule);
      for (const role of preset.roles) {
        validateRule(role.rule);
        expect(role.params.length).toBeGreaterThan(0);
      }
    }
  });

  it('covers the industries the research found', () => {
    expect(payrollPresets.map((preset) => preset.code)).toEqual([
      'catering_revenue_pool',
      'retail_progressive_percent',
      'delivery_per_order',
      'services_master_percent',
      'shift_night_overtime',
      'b2b_sales_progressive',
      'simple_hourly',
    ]);
  });
});