const { describe, test } = require('node:test');
const assert = require('node:assert');
const { BB } = require('./setup');

describe('BB.state', () => {
    test('subscribe registers callback and fires on set', () => {
        let called = false;
        BB.state.subscribe('_t1', () => { called = true; });
        BB.state.set('_t1', 'hello');
        assert.ok(called, 'Subscriber should fire');
    });

    test('set passes old and new values to subscriber', () => {
        BB.state.set('_t2', 'first');
        let capturedOld;
        BB.state.subscribe('_t2', (n, o) => { capturedOld = o; });
        BB.state.set('_t2', 'second');
        assert.strictEqual(capturedOld, 'first');
    });

    test('set does not trigger unrelated subscribers', () => {
        let called = false;
        BB.state.subscribe('_t3_a', () => { called = true; });
        BB.state.set('_t3_b', 'val');
        assert.ok(!called, 'Unrelated subscriber should not fire');
    });

    test('unsubscribe removes callback', () => {
        let count = 0;
        const unsub = BB.state.subscribe('_t4', () => { count++; });
        BB.state.set('_t4', 'a');
        assert.strictEqual(count, 1);
        unsub();
        BB.state.set('_t4', 'b');
        assert.strictEqual(count, 1);
    });

    test('set with same value still triggers', () => {
        BB.state.set('_t5', 'same');
        let count = 0;
        BB.state.subscribe('_t5', () => { count++; });
        BB.state.set('_t5', 'same');
        assert.strictEqual(count, 1);
    });

    test('multiple subscribers on same key all fire', () => {
        let a = false, b = false;
        BB.state.subscribe('_t6', () => { a = true; });
        BB.state.subscribe('_t6', () => { b = true; });
        BB.state.set('_t6', 'v');
        assert.ok(a && b, 'Both should fire');
    });

    test('direct property assignment triggers via Proxy', () => {
        let called = false;
        BB.state.subscribe('_t7', () => { called = true; });
        BB.state._t7 = 'proxy';
        assert.ok(called, 'Proxy set should trigger');
        assert.strictEqual(BB.state._t7, 'proxy');
    });

    test('get returns current value', () => {
        BB.state.set('_t8', 42);
        assert.strictEqual(BB.state.get('_t8'), 42);
    });

    test('initial state has expected default keys', () => {
        assert.ok(Array.isArray(BB.state.sources));
        assert.strictEqual(BB.state.currentOrder, 'chronological');
        assert.strictEqual(BB.state.hasMore, false);
        assert.strictEqual(BB.state.selectedItemId, null);
    });
});