import { describe, it, expect, beforeEach } from 'vitest';
import { parseConfig } from '@/config';

function createScript(
  attrs: Record<string, string>,
  src = 'https://cdn.example.com/messenzy-widget.iife.js',
): HTMLScriptElement {
  const script = document.createElement('script');
  script.src = src;
  for (const [key, value] of Object.entries(attrs)) {
    script.setAttribute(key, value);
  }
  document.head.appendChild(script);
  return script;
}

beforeEach(() => {
  document.head.innerHTML = '';
  document.body.innerHTML = '';
});

describe('parseConfig', () => {
  it('returns null when no script with data-bot-id is present', () => {
    expect(parseConfig()).toBeNull();
  });

  it('returns null when data-api-key is missing', () => {
    createScript({ 'data-bot-id': 'b1' });
    expect(parseConfig()).toBeNull();
  });

  it('returns null when data-bot-id is missing', () => {
    createScript({ 'data-api-key': 'k1' });
    expect(parseConfig()).toBeNull();
  });

  it('parses required fields', () => {
    createScript({ 'data-bot-id': 'b1', 'data-api-key': 'k1' });
    const config = parseConfig();
    expect(config).not.toBeNull();
    expect(config?.botId).toBe('b1');
    expect(config?.apiKey).toBe('k1');
  });

  it('derives serverUrl from script src when data-server-url absent', () => {
    createScript(
      { 'data-bot-id': 'b1', 'data-api-key': 'k1' },
      'https://widgets.example.com/path/messenzy.iife.js',
    );
    expect(parseConfig()?.serverUrl).toBe('https://widgets.example.com');
  });

  it('respects explicit data-server-url override', () => {
    createScript({
      'data-bot-id': 'b1',
      'data-api-key': 'k1',
      'data-server-url': 'https://api.foo.test',
    });
    expect(parseConfig()?.serverUrl).toBe('https://api.foo.test');
  });

  it('defaults position to bottom-right', () => {
    createScript({ 'data-bot-id': 'b1', 'data-api-key': 'k1' });
    expect(parseConfig()?.position).toBe('bottom-right');
  });

  it('parses position bottom-left', () => {
    createScript({
      'data-bot-id': 'b1',
      'data-api-key': 'k1',
      'data-position': 'bottom-left',
    });
    expect(parseConfig()?.position).toBe('bottom-left');
  });

  describe('shadow attribute (PR B opt-in)', () => {
    it('shadow=false when data-shadow absent', () => {
      createScript({ 'data-bot-id': 'b1', 'data-api-key': 'k1' });
      expect(parseConfig()?.shadow).toBe(false);
    });

    it('shadow=true when data-shadow="true"', () => {
      createScript({
        'data-bot-id': 'b1',
        'data-api-key': 'k1',
        'data-shadow': 'true',
      });
      expect(parseConfig()?.shadow).toBe(true);
    });

    it('shadow=false when data-shadow="false"', () => {
      createScript({
        'data-bot-id': 'b1',
        'data-api-key': 'k1',
        'data-shadow': 'false',
      });
      expect(parseConfig()?.shadow).toBe(false);
    });

    it('shadow=false when data-shadow="" (empty)', () => {
      createScript({
        'data-bot-id': 'b1',
        'data-api-key': 'k1',
        'data-shadow': '',
      });
      expect(parseConfig()?.shadow).toBe(false);
    });

    it('shadow=false for unrecognized values (e.g. "1", "yes")', () => {
      createScript({
        'data-bot-id': 'b1',
        'data-api-key': 'k1',
        'data-shadow': '1',
      });
      expect(parseConfig()?.shadow).toBe(false);
    });
  });
});