import * as assert from 'node:assert/strict';
import { describe, it } from 'node:test';

import { ContentDisposition } from './content-disposition.ts';

describe('ContentDisposition', () => {
  it('initializes with an empty string', () => {
    let header = new ContentDisposition('');
    assert.equal(header.type, undefined);
    assert.equal(header.filename, undefined);
  });

  it('initializes with a string', () => {
    let header = new ContentDisposition('attachment; filename="example.txt"');
    assert.equal(header.type, 'attachment');
    assert.equal(header.filename, 'example.txt');
  });

  it('initializes with an object', () => {
    let header = new ContentDisposition({ type: 'attachment', filename: 'example.txt' });
    assert.equal(header.type, 'attachment');
    assert.equal(header.filename, 'example.txt');
  });

  it('initializes with another ContentDisposition', () => {
    let header = new ContentDisposition(
      new ContentDisposition('attachment; filename="example.txt"'),
    );
    assert.equal(header.type, 'attachment');
    assert.equal(header.filename, 'example.txt');
  });

  it('handles whitespace in initial value', () => {
    let header = new ContentDisposition(' inline ;  filename = "document.pdf" ');
    assert.equal(header.type, 'inline');
    assert.equal(header.filename, 'document.pdf');
  });

  it('sets and gets type', () => {
    let header = new ContentDisposition('attachment');
    header.type = 'inline';
    assert.equal(header.type, 'inline');
  });

  it('sets and gets filename', () => {
    let header = new ContentDisposition('attachment');
    header.filename = 'example.txt';
    assert.equal(header.filename, 'example.txt');
  });

  it('sets and gets name', () => {
    let header = new ContentDisposition('form-data');
    header.name = 'field1';
    assert.equal(header.name, 'field1');
  });

  it('sets and gets filenameSplat', () => {
    let header = new ContentDisposition('attachment');
    header.filenameSplat = "UTF-8''%E6%96%87%E4%BB%B6.txt";
    assert.equal(header.filenameSplat, "UTF-8''%E6%96%87%E4%BB%B6.txt");
  });

  it('handles quoted attribute values', () => {
    let header = new ContentDisposition('attachment; filename="file with spaces.txt"');
    assert.equal(header.filename, 'file with spaces.txt');
  });

  it('converts to string correctly', () => {
    let header = new ContentDisposition('attachment; filename="example.txt"');
    assert.equal(header.toString(), 'attachment; filename=example.txt');
  });

  it('converts to an empty string when type is not set', () => {
    let header = new ContentDisposition();
    header.filename = 'example.txt';
    assert.equal(header.toString(), '');
  });

  it('handles multiple attributes', () => {
    let header = new ContentDisposition('form-data; name="field1"; filename="example.txt"');
    assert.equal(header.type, 'form-data');
    assert.equal(header.name, 'field1');
    assert.equal(header.filename, 'example.txt');
  });

  it('preserves case for type', () => {
    let header = new ContentDisposition('Attachment');
    assert.equal(header.type, 'Attachment');
  });

  it('handles attribute values with special characters', () => {
    let header = new ContentDisposition(
      'attachment; filename="file with spaces and (parentheses).txt"',
    );
    assert.equal(header.filename, 'file with spaces and (parentheses).txt');
  });

  it('correctly quotes attribute values in toString()', () => {
    let header = new ContentDisposition('attachment');
    header.filename = 'file "with" quotes.txt';
    assert.equal(header.toString(), 'attachment; filename="file \\"with\\" quotes.txt"');
  });

  it('handles empty attribute values', () => {
    let header = new ContentDisposition('form-data; name=');
    assert.equal(header.name, '');
  });

  it('ignores attributes without values', () => {
    let header = new ContentDisposition('attachment; filename');
    assert.equal(header.filename, undefined);
  });

  it('preserves order of attributes in toString()', () => {
    let header = new ContentDisposition('form-data; name="field1"; filename="example.txt"');
    assert.equal(header.toString(), 'form-data; name=field1; filename=example.txt');
  });

  it('handles filename* (RFC 5987) correctly', () => {
    let header = new ContentDisposition("attachment; filename*=UTF-8''%E6%96%87%E4%BB%B6.txt");
    assert.equal(header.filenameSplat, "UTF-8''%E6%96%87%E4%BB%B6.txt");
  });

  it('prioritizes filename* over filename when both are present', () => {
    let header = new ContentDisposition(
      'attachment; filename="fallback.txt"; filename*=UTF-8\'\'%E6%96%87%E4%BB%B6.txt',
    );
    assert.equal(header.filename, 'fallback.txt');
    assert.equal(header.filenameSplat, "UTF-8''%E6%96%87%E4%BB%B6.txt");
  });

  it('handles form-data disposition type correctly', () => {
    let header = new ContentDisposition('form-data; name="uploadedfile"; filename="example.txt"');
    assert.equal(header.type, 'form-data');
    assert.equal(header.name, 'uploadedfile');
    assert.equal(header.filename, 'example.txt');
  });

  describe('preferredFilename', () => {
    it('returns filename* when both filename and filename* are present', () => {
      let header = new ContentDisposition(
        'attachment; filename="old.txt"; filename*=UTF-8\'\'new.txt',
      );
      assert.equal(header.preferredFilename, 'new.txt');
    });

    it('returns filename when only filename is present', () => {
      let header = new ContentDisposition('attachment; filename="document.pdf"');
      assert.equal(header.preferredFilename, 'document.pdf');
    });

    it('returns filename* when only filename* is present', () => {
      let header = new ContentDisposition("attachment; filename*=UTF-8''special%20file.txt");
      assert.equal(header.preferredFilename, 'special file.txt');
    });

    it('handles UTF-8 encoded filename* with special characters', () => {
      let header = new ContentDisposition("attachment; filename*=UTF-8''%E6%96%87%E4%BB%B6.txt");
      assert.equal(header.preferredFilename, '文件.txt');
    });

    it('handles ISO-8859-1 encoded filename* with special characters', () => {
      let header = new ContentDisposition("attachment; filename*=ISO-8859-1''f%F6o.txt");
      assert.equal(header.preferredFilename, 'föo.txt');
    });

    it('handles filename* with spaces and other special characters', () => {
      let header = new ContentDisposition(
        "attachment; filename*=UTF-8''hello%20world%21%20%26%20goodbye.txt",
      );
      assert.equal(header.preferredFilename, 'hello world! & goodbye.txt');
    });

    it('returns undefined when no filename or filename* is present', () => {
      let header = new ContentDisposition('attachment');
      assert.equal(header.preferredFilename, undefined);
    });

    it('falls back to filename when filename* is invalid', () => {
      let header = new ContentDisposition('attachment; filename="fallback.txt"; filename*=invalid');
      assert.equal(header.preferredFilename, 'fallback.txt');
    });

    it('correctly decodes ISO-8859-1 encoded filename', () => {
      let header = new ContentDisposition("attachment; filename*=ISO-8859-1''f%F6o.txt");
      assert.equal(header.preferredFilename, 'föo.txt');
    });

    it('correctly decodes ISO-8859-15 encoded filename', () => {
      let header = new ContentDisposition("attachment; filename*=ISO-8859-15''file%A4.txt");
      assert.equal(header.preferredFilename, 'file€.txt');
    });

    it('correctly decodes windows-1252 encoded filename', () => {
      let header = new ContentDisposition("attachment; filename*=windows-1252''file%80.txt");
      assert.equal(header.preferredFilename, 'file\x80.txt');
    });

    it('handles UTF-8 encoded filename correctly', () => {
      let header = new ContentDisposition("attachment; filename*=UTF-8''%E6%96%87%E4%BB%B6.txt");
      assert.equal(header.preferredFilename, '文件.txt');
    });

    it('falls back gracefully with a warning for unknown charsets', () => {
      let warn = console.warn;
      let warnWasCalled = false;
      console.warn = () => {
        warnWasCalled = true;
      };

      let header = new ContentDisposition("attachment; filename*=unknown-charset''file%FF.txt");

      assert.equal(header.preferredFilename, 'fileÿ.txt');
      assert.ok(warnWasCalled, 'console.warn should have been called');

      console.warn = warn;
    });
  });
});