import { getTestRunner } from './runtime.ts';
import { Ansi, KeyCommand, readKey } from './ansi.ts';
import { Document, Row } from './document.ts';
import Buffer from './buffer.ts';
import {
	chars,
	ctrl_key,
	is_ascii,
	is_control,
	noop,
	ord,
	strlen,
	truncate,
} from './utils.ts';
import { Editor } from './editor.ts';
import { defaultTerminalSize } from './termios.ts';

const t = await getTestRunner();

const testObj = {
	'ANSI::ANSI utils': {
		'Ansi.moveCursor': () => {
			t.assertEquals(Ansi.moveCursor(1, 2), '\x1b[2;3H');
		},
		'Ansi.moveCursorForward': () => {
			t.assertEquals(Ansi.moveCursorForward(2), '\x1b[2C');
		},
		'Ansi.moveCursorDown': () => {
			t.assertEquals(Ansi.moveCursorDown(7), '\x1b[7B');
		},
	},
	'ANSI::readKey()': {
		'readKey passthrough': () => {
			// Ignore unhandled escape sequences
			t.assertEquals(readKey('\x1b[]'), '\x1b[]');

			// Pass explicitly mapped values right through
			t.assertEquals(readKey(KeyCommand.ArrowUp), KeyCommand.ArrowUp);
			t.assertEquals(readKey(KeyCommand.Home), KeyCommand.Home);
			t.assertEquals(readKey(KeyCommand.Delete), KeyCommand.Delete);
		},
		'readKey Home': () => {
			['\x1b[1~', '\x1b[7~', '\x1b[H', '\x1bOH'].forEach((code) => {
				t.assertEquals(readKey(code), KeyCommand.Home);
			});
		},
		'readKey End': () => {
			['\x1b[4~', '\x1b[8~', '\x1b[F', '\x1bOF'].forEach((code) => {
				t.assertEquals(readKey(code), KeyCommand.End);
			});
		},
	},
	Buffer: {
		'Buffer exists': () => {
			const b = new Buffer();
			t.assertInstanceOf(b, Buffer);
			t.assertEquals(b.strlen(), 0);
		},
		'Buffer.appendLine': () => {
			const b = new Buffer();

			// Carriage return and line feed
			b.appendLine();
			t.assertEquals(b.strlen(), 2);

			b.clear();
			t.assertEquals(b.strlen(), 0);

			b.appendLine('foo');
			t.assertEquals(b.strlen(), 5);
		},
		'Buffer.append': () => {
			const b = new Buffer();

			b.append('foobar');
			t.assertEquals(b.strlen(), 6);
			b.clear();

			b.append('foobar', 3);
			t.assertEquals(b.strlen(), 3);
		},
		'Buffer.flush': async () => {
			const b = new Buffer();
			b.appendLine('foobarbaz' + Ansi.ClearLine);
			t.assertEquals(b.strlen(), 14);

			await b.flush();

			t.assertEquals(b.strlen(), 0);
		},
	},
	Document: {
		'Document.empty': () => {
			const doc = Document.empty();
			t.assertEquals(doc.numRows, 0);
			t.assertTrue(doc.isEmpty());
			t.assertEquals(doc.row(0), null);
		},
		'Document.appendRow': () => {
			const doc = Document.empty();
			doc.appendRow('foobar');
			t.assertEquals(doc.numRows, 1);
			t.assertFalse(doc.isEmpty());
			t.assertInstanceOf(doc.row(0), Row);
		},
	},
	'Document::Row': {
		'new Row': () => {
			const row = new Row();
			t.assertEquals(row.toString(), '');
		},
	},
	Editor: {
		'new Editor': () => {
			const e = new Editor(defaultTerminalSize);
			t.assertInstanceOf(e, Editor);
		},
	},
	'Util::Misc fns': {
		'noop fn': () => {
			t.assertExists(noop);
			t.assertEquals(noop(), undefined);
		},
	},
	'Util::String fns': {
		'ord() returns 256 on invalid string': () => {
			t.assertEquals(ord(''), 256);
		},
		'ord() returns number on valid string': () => {
			t.assertEquals(ord('a'), 97);
		},
		'chars() properly splits strings into unicode characters': () => {
			t.assertEquals(chars('😺😸😹'), ['😺', '😸', '😹']);
		},
		'ctrl_key() returns expected values': () => {
			const ctrl_a = ctrl_key('a');
			t.assertTrue(is_control(ctrl_a));
			t.assertEquals(ctrl_a, String.fromCodePoint(0x01));

			const invalid = ctrl_key('😺');
			t.assertFalse(is_control(invalid));
			t.assertEquals(invalid, '😺');
		},
		'is_ascii() properly discerns ascii chars': () => {
			t.assertTrue(is_ascii('asjyverkjhsdf1928374'));
			t.assertFalse(is_ascii('😺acalskjsdf'));
			t.assertFalse(is_ascii('ab😺ac'));
		},
		'is_control() works as expected': () => {
			t.assertFalse(is_control('abc'));
			t.assertTrue(is_control(String.fromCodePoint(0x01)));
			t.assertFalse(is_control('😺'));
		},
		'strlen() returns expected length for ascii strings': () => {
			t.assertEquals(strlen('abc'), 'abc'.length);
		},
		'strlen() returns expected length for multibyte characters': () => {
			t.assertEquals(strlen('😺😸😹'), 3);
			t.assertNotEquals('😺😸😹'.length, strlen('😺😸😹'));

			// Skin tone modifier + base character
			t.assertEquals(strlen('🤰🏼'), 2);
			t.assertNotEquals('🤰🏼'.length, strlen('🤰🏼'));

			// This has 4 sub-characters, and 3 zero-width-joiners
			t.assertEquals(strlen('👨‍👩‍👧‍👦'), 7);
			t.assertNotEquals('👨‍👩‍👧‍👦'.length, strlen('👨‍👩‍👧‍👦'));
		},
		'truncate() shortens strings': () => {
			t.assertEquals(truncate('😺😸😹', 1), '😺');
			t.assertEquals(truncate('😺😸😹', 5), '😺😸😹');
			t.assertEquals(truncate('👨‍👩‍👧‍👦', 5), '👨‍👩‍👧');
		},
	},
};

t.testSuite(testObj);