/*
 * Copyright (C) 2024  Puter Technologies Inc.
 *
 * This file is part of Phoenix Shell.
 *
 * Phoenix Shell is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
import assert from 'assert';

import { StatefulProcessorBuilder } from '../src/util/statemachine.js';

describe('StatefulProcessor', async () => {
    it ('should satisfy: simple example', async () => {
        const messages = [];
        const processor = new StatefulProcessorBuilder()
            .state('start', async ctx => {
                messages.push('start');
                ctx.setState('intermediate');
            })
            .state('intermediate', async ctx => {
                messages.push('intermediate');
                ctx.setState('end');
            })
            .build();
        await processor.run();
        assert.deepEqual(messages, ['start', 'intermediate']);
    });
    it ('should handle transition', async () => {
        const messages = [];
        const processor = new StatefulProcessorBuilder()
            .state('start', async ctx => {
                messages.push('start');
                ctx.setState('intermediate');
            })
            .onTransitionTo('intermediate', ctx => {
                messages.push('transition');
                ctx.locals.test1 = true;
            })
            .state('intermediate', async ctx => {
                messages.push('intermediate');
                assert.equal(ctx.locals.test1, true);
                ctx.setState('end');
            })
            .build();
        await processor.run();
        assert.deepEqual(messages, [
            'start', 'transition', 'intermediate'
        ]);
    });
    it ('should handle beforeAll', async () => {
        const messages = [];
        const processor = new StatefulProcessorBuilder()
            .state('start', async ctx => {
                messages.push('start');
                assert.equal(ctx.locals.test2, 'undefined_a');
                ctx.setState('intermediate');
            })
            .beforeAll('example-hook', async ctx => {
                messages.push('before');
                ctx.locals.test2 += '_a';
            })
            .state('intermediate', async ctx => {
                messages.push('intermediate');
                assert.equal(ctx.locals.test2, 'undefined_a');
                ctx.setState('end');
            })
            .build();
        await processor.run();
        assert.deepEqual(messages, [
            'before', 'start', 'before', 'intermediate'
        ]);
    });
    it ('should fail when export is missing', async () => {
        const messages = [];
        const processor = new StatefulProcessorBuilder()
            .external('test3', { required: true })
            .state('start', async ctx => {
                ctx.setState('end');
            })
            .build();
        await assert.rejects(processor.run());
    });
    it ('should succeed when export is provided', async () => {
        const messages = [];
        const processor = new StatefulProcessorBuilder()
            .external('test3', { required: true })
            .state('start', async ctx => {
                messages.push(ctx.externs.test3)
                ctx.setState('end');
            })
            .build();
        await processor.run({ test3: 'test4' });
        assert.deepEqual(messages, ['test4']);
    });
})