/**
 * Unit tests for api.js validation logic and boundaries.
 */

import { test, describe } from 'node:test';
import assert from 'node:assert/strict';
import { getUtf8ByteLength, validateCredentials, submitQuery } from '../js/api.js';

describe('API validation and boundaries', () => {
  test('getUtf8ByteLength correctly calculates ASCII and multibyte UTF-8 lengths', () => {
    assert.equal(getUtf8ByteLength('hello'), 5);
    // Multibyte characters:
    // '€' is 3 bytes (0xE2 0x82 0xAC)
    // '🚀' is 4 bytes (0xF0 0x9F 0x99 0x80)
    assert.equal(getUtf8ByteLength('€'), 3);
    assert.equal(getUtf8ByteLength('🚀'), 4);
    assert.equal(getUtf8ByteLength('こんにちは'), 15); // 5 x 3 bytes
  });

  test('validateCredentials validates valid HTTP and HTTPS URLs', () => {
    assert.doesNotThrow(() => {
      validateCredentials({
        url: 'https://confluence.example.com',
        pat: 'valid-pat-string'
      });
    });

    assert.doesNotThrow(() => {
      validateCredentials({
        url: 'http://localhost:8080/confluence',
        pat: 'pat-token'
      });
    });
  });

  test('validateCredentials rejects empty or missing fields', () => {
    assert.throws(
      () => validateCredentials({ url: '', pat: 'pat' }),
      (err) => err.code === 'invalid_input'
    );

    assert.throws(
      () => validateCredentials({ url: 'https://example.com', pat: '   ' }),
      (err) => err.code === 'invalid_input'
    );
  });

  test('validateCredentials rejects invalid protocols like javascript: or file:', () => {
    assert.throws(
      () => validateCredentials({ url: 'javascript:alert(1)', pat: 'pat' }),
      (err) => err.code === 'invalid_input'
    );

    assert.throws(
      () => validateCredentials({ url: 'file:///etc/passwd', pat: 'pat' }),
      (err) => err.code === 'invalid_input'
    );
  });

  test('validateCredentials exact 8 KiB boundary check', () => {
    // Exactly 8192 bytes (8 KiB) passes
    const exact8KiBPat = 'a'.repeat(8192);
    assert.doesNotThrow(() => {
      validateCredentials({ url: 'https://example.com', pat: exact8KiBPat });
    });

    // 8193 bytes fails
    const over8KiBPat = 'a'.repeat(8193);
    assert.throws(
      () => validateCredentials({ url: 'https://example.com', pat: over8KiBPat }),
      (err) => err.code === 'invalid_input' && err.message.includes('8 KiB')
    );

    // Multibyte 8 KiB boundary: 2048 emojis = 8192 bytes (passes)
    const exact8KiBEmoji = '🚀'.repeat(2048);
    assert.equal(getUtf8ByteLength(exact8KiBEmoji), 8192);
    assert.doesNotThrow(() => {
      validateCredentials({ url: 'https://example.com', pat: exact8KiBEmoji });
    });

    // 2049 emojis = 8196 bytes (fails)
    const over8KiBEmoji = exact8KiBEmoji + '🚀';
    assert.throws(
      () => validateCredentials({ url: 'https://example.com', pat: over8KiBEmoji }),
      (err) => err.code === 'invalid_input' && err.message.includes('8 KiB')
    );
  });

  test('runtime 16 MiB multibyte UTF-8 boundary validation on prompt', async () => {
    const validCredentials = { url: 'https://approved.example.com', pat: 'dummy-pat-123' };

    // Construct a real 16 MiB string containing 4-byte multibyte emojis at runtime
    // 4 bytes * 4,194,304 = 16,777,216 bytes (exactly 16 MiB)
    const chunk = '🚀'.repeat(1024); // 4096 bytes
    const exactly16MiBPrompt = chunk.repeat(4096); // 16 MiB
    assert.equal(getUtf8ByteLength(exactly16MiBPrompt), 16 * 1024 * 1024);

    // Prompt exceeding 16 MiB by 1 byte
    const over16MiBPrompt = exactly16MiBPrompt + 'a';
    assert.equal(getUtf8ByteLength(over16MiBPrompt), 16 * 1024 * 1024 + 1);

    // Rejection above 16 MiB
    await assert.rejects(
      async () => {
        await submitQuery({ prompt: over16MiBPrompt, credentials: validCredentials });
      },
      (err) => err.code === 'invalid_input' && err.message.includes('16 MiB')
    );
  });
});