// @vitest-environment node

import fs from 'node:fs';
import path from 'node:path';
import { describe, expect, it } from 'vitest';

function read(relativePath: string): string {
  return fs.readFileSync(path.resolve(__dirname, relativePath), 'utf8');
}

function readJson<T>(relativePath: string): T {
  return JSON.parse(read(relativePath)) as T;
}

function getLeaf(record: Record<string, unknown>, dottedPath: string): unknown {
  return dottedPath.split('.').reduce<unknown>((value, key) => {
    if (!value || typeof value !== 'object' || Array.isArray(value)) {
      return undefined;
    }

    return (value as Record<string, unknown>)[key];
  }, record);
}

describe('ManualInvoices i18n wiring contract', () => {
  it('T011: headings, descriptions, field labels, placeholders, automated item headers, and line-item section titles resolve through msp/invoicing', () => {
    const source = read('../src/components/billing-dashboard/ManualInvoices.tsx');
    const en = readJson<Record<string, unknown>>(
      '../../../server/public/locales/en/msp/invoicing.json',
    );

    const keyChecks = [
      'manualInvoices.title',
      'manualInvoices.detailsTitle',
      'manualInvoices.detailsDescription',
      'manualInvoices.description',
      'manualInvoices.fields.client',
      'manualInvoices.fields.invoiceNumber',
      'manualInvoices.fields.invoiceNumberOptional',
      'manualInvoices.placeholders.selectClient',
      'manualInvoices.placeholders.invoiceNumberOptional',
      'manualInvoices.automatedItems.title',
      'manualInvoices.automatedItems.service',
      'manualInvoices.automatedItems.total',
      'manualInvoices.lineItems.manual',
      'manualInvoices.lineItems.all',
      'manualInvoices.labels.total',
      'common.labels.unknownClient',
    ];

    expect(source).toContain("useTranslation('msp/invoicing')");
    expect(source).toContain('useFormatters()');
    expect(source).toContain("placeholder={t('manualInvoices.placeholders.selectClient'");

    for (const key of keyChecks) {
      expect(source).toContain(key);
      expect(getLeaf(en, key)).toBeDefined();
    }
  });

  it('T012: action buttons, submit states, prepayment controls, credit-expiration help, and validation errors resolve through msp/invoicing', () => {
    const source = read('../src/components/billing-dashboard/ManualInvoices.tsx');
    const en = readJson<Record<string, unknown>>(
      '../../../server/public/locales/en/msp/invoicing.json',
    );

    const directKeyChecks = [
      'manualInvoices.actions.addCharge',
      'manualInvoices.actions.addDiscount',
      'manualInvoices.actions.saveChanges',
      'manualInvoices.actions.generate',
      'manualInvoices.actions.processing',
      'manualInvoices.prepayment.label',
      'manualInvoices.prepayment.description',
      'manualInvoices.creditExpiration.label',
      'manualInvoices.creditExpiration.helpText',
      'manualInvoices.errors.selectClient',
      'manualInvoices.errors.invoiceNumberUnique',
      'manualInvoices.errors.noTaxRateConfigured',
      'manualInvoices.errors.serviceNotFound',
      'manualInvoices.errors.cannotModify',
      'manualInvoices.errors.loadItems',
      'manualInvoices.errors.refresh',
      'manualInvoices.automatedItems.unknownService',
    ];
    const dynamicLocaleChecks = [
      'manualInvoices.errors.updateFailed',
      'manualInvoices.errors.generateFailed',
    ];

    expect(source).toContain('translateManualInvoiceError');
    expect(source).toContain("mode === 'update' ? 'updateFailed' : 'generateFailed'");
    expect(source).toContain("t('manualInvoices.prepayment.label'");
    expect(source).toContain("t('manualInvoices.creditExpiration.helpText'");

    for (const key of directKeyChecks) {
      expect(source).toContain(key);
      expect(getLeaf(en, key)).toBeDefined();
    }

    for (const key of dynamicLocaleChecks) {
      expect(getLeaf(en, key)).toBeDefined();
    }
  });

  it('T013: error fallback resolves title and retry action through msp/invoicing', () => {
    const source = read('../src/components/billing-dashboard/ManualInvoices.tsx');
    const en = readJson<Record<string, unknown>>(
      '../../../server/public/locales/en/msp/invoicing.json',
    );

    const keyChecks = [
      'manualInvoices.errorFallback.title',
      'manualInvoices.errorFallback.retry',
    ];

    for (const key of keyChecks) {
      expect(source).toContain(key);
      expect(getLeaf(en, key)).toBeDefined();
    }
  });
});