const { test } = require('node:test');
const assert = require('node:assert');
const path = require('node:path');
const fs = require('node:fs');
const os = require('node:os');
const { bake } = require('../src/bake');

const FIX = path.resolve(__dirname, 'fixtures/small-fresh');

test('bake-with-lock: existing IDs preserved, new tile appended', async () => {
    const outDir = fs.mkdtempSync(path.join(os.tmpdir(), 'atlas-bake-lock-'));
    try {
        // Pre-seed lock with grass=5, stone=6 (non-default IDs)
        fs.writeFileSync(
            path.join(outDir, 'tiles.atlas.lock.json'),
            JSON.stringify({
                atlas_id: 'small_demo',
                bindings: { grass: 5, stone: 6 },
                deleted: [],
                next_id: 7,
            }, null, 2),
        );
        const result = await bake({
            inDir: FIX,
            outDir,
            atlasId: 'small_demo',
            tileSize: 32,
        });
        assert.strictEqual(result.tileCount, 3);

        const lock = JSON.parse(fs.readFileSync(path.join(outDir, 'tiles.atlas.lock.json'), 'utf8'));
        assert.strictEqual(lock.bindings.grass, 5);   // preserved
        assert.strictEqual(lock.bindings.stone, 6);   // preserved
        assert.strictEqual(lock.bindings.water, 7);   // new
        assert.strictEqual(lock.next_id, 8);

        const atlas = JSON.parse(fs.readFileSync(path.join(outDir, 'tiles.atlas.json'), 'utf8'));
        const ids = atlas.tiles.map(t => t.id).sort();
        assert.deepStrictEqual(ids, [5, 6, 7]);
    } finally {
        fs.rmSync(outDir, { recursive: true, force: true });
    }
});