'use strict';

import test from 'node:test';
import assert from 'node:assert/strict';

import {
    wheelDeltaFromInput,
    containsMouseSequence,
    stripMouseSequences,
} from '../src/ui/mouse.js';

test('decodes SGR wheel direction', () => {
    assert.equal(wheelDeltaFromInput('\x1b[<64;88;20M'), -1);
    assert.equal(wheelDeltaFromInput('[<65;88;20M'), 1);
    // Some terminals add modifier bits to the button code.
    assert.equal(wheelDeltaFromInput('[<96;88;20M'), -1);
    assert.equal(wheelDeltaFromInput('[<97;88;20M'), 1);
});

test('decodes legacy X10 wheel direction', () => {
    const x10Up = `\x1b[M${String.fromCharCode(96)}!#`;
    const x10Down = `\x1b[M${String.fromCharCode(97)}!#`;
    assert.equal(wheelDeltaFromInput(x10Up), -1);
    assert.equal(wheelDeltaFromInput(x10Down), 1);
    assert.equal(wheelDeltaFromInput(x10Up.slice(1)), -1, 'accepts Ink-stripped ESC');
});

test('ignores non-wheel and incomplete mouse input', () => {
    assert.equal(wheelDeltaFromInput('[<0;1;1M'), 0);
    assert.equal(wheelDeltaFromInput('[<64;1;1'), 0);
    assert.equal(wheelDeltaFromInput('hello'), 0);
});

test('removes mouse reports without dropping surrounding text', () => {
    const value = 'before\x1b[<65;88;20Mafter';
    assert.equal(containsMouseSequence(value), true);
    assert.equal(stripMouseSequences(value), 'beforeafter');
    assert.equal(stripMouseSequences('plain text'), 'plain text');

    const x10 = `\x1b[M${String.fromCharCode(96)}!#`;
    assert.equal(containsMouseSequence(x10), true);
    assert.equal(stripMouseSequences(`before${x10}after`), 'beforeafter');
});

test('reassembles an SGR wheel report split across input events', () => {
    assert.equal(wheelDeltaFromInput('[<64;'), 0);
    assert.equal(wheelDeltaFromInput('88;20M'), -1);
    // A normal key clears any stale partial sequence state.
    assert.equal(wheelDeltaFromInput('x'), 0);
});

test('removes split SGR fragments from a text-input value', () => {
    assert.equal(stripMouseSequences('before[<64;'), 'before');
    assert.equal(stripMouseSequences('before88;20M'), 'before');
});