/**
 * 增量序列化系统测试
 */

import { Component } from '../../../src/ECS/Component';
import { Scene } from '../../../src/ECS/Scene';
import { Entity } from '../../../src/ECS/Entity';
import {
    Serializable,
    Serialize,
    IncrementalSerializer,
    ChangeOperation
} from '../../../src/ECS/Serialization';
import { ECSComponent } from '../../../src/ECS/Decorators';
import { ComponentRegistry } from '../../../src/ECS/Core/ComponentStorage';

// 测试组件定义
@ECSComponent('IncTest_Position')
@Serializable({ version: 1 })
class PositionComponent extends Component {
    @Serialize()
    public x: number = 0;

    @Serialize()
    public y: number = 0;

    constructor(x: number = 0, y: number = 0) {
        super();
        this.x = x;
        this.y = y;
    }
}

@ECSComponent('IncTest_Velocity')
@Serializable({ version: 1 })
class VelocityComponent extends Component {
    @Serialize()
    public dx: number = 0;

    @Serialize()
    public dy: number = 0;
}

@ECSComponent('IncTest_Health')
@Serializable({ version: 1 })
class HealthComponent extends Component {
    @Serialize()
    public current: number = 100;

    @Serialize()
    public max: number = 100;
}

describe('Incremental Serialization System', () => {
    let scene: Scene;

    beforeEach(() => {
        IncrementalSerializer.resetVersion();
        ComponentRegistry.reset();

        // 重新注册测试组件
        ComponentRegistry.register(PositionComponent);
        ComponentRegistry.register(VelocityComponent);
        ComponentRegistry.register(HealthComponent);

        scene = new Scene({ name: 'IncrementalTestScene' });
    });

    afterEach(() => {
        scene.end();
    });

    describe('Scene Snapshot', () => {
        it('应该创建场景快照', () => {
            const entity1 = scene.createEntity('Entity1');
            entity1.addComponent(new PositionComponent(10, 20));

            const entity2 = scene.createEntity('Entity2');
            entity2.addComponent(new VelocityComponent());

            scene.createIncrementalSnapshot();

            expect(scene.hasIncrementalSnapshot()).toBe(true);
        });

        it('应该在快照中包含所有实体', () => {
            const entity1 = scene.createEntity('Entity1');
            entity1.addComponent(new PositionComponent(10, 20));

            const entity2 = scene.createEntity('Entity2');
            entity2.addComponent(new VelocityComponent());

            const snapshot = IncrementalSerializer.createSnapshot(scene);

            expect(snapshot.entityIds.size).toBe(2);
            expect(snapshot.entityIds.has(entity1.id)).toBe(true);
            expect(snapshot.entityIds.has(entity2.id)).toBe(true);
        });

        it('应该在快照中包含实体基本信息', () => {
            const entity = scene.createEntity('TestEntity');
            entity.tag = 42;
            entity.active = false;
            entity.enabled = false;
            entity.updateOrder = 5;

            const snapshot = IncrementalSerializer.createSnapshot(scene);

            const entityData = snapshot.entities.get(entity.id);
            expect(entityData).toBeDefined();
            expect(entityData!.name).toBe('TestEntity');
            expect(entityData!.tag).toBe(42);
            expect(entityData!.active).toBe(false);
            expect(entityData!.enabled).toBe(false);
            expect(entityData!.updateOrder).toBe(5);
        });

        it('应该在快照中包含组件数据', () => {
            const entity = scene.createEntity('Entity');
            entity.addComponent(new PositionComponent(100, 200));

            const snapshot = IncrementalSerializer.createSnapshot(scene, {
                deepComponentComparison: true
            });

            const components = snapshot.components.get(entity.id);
            expect(components).toBeDefined();
            expect(components!.has('IncTest_Position')).toBe(true);
        });
    });

    describe('Entity Changes Detection', () => {
        it('应该检测新增的实体', () => {
            scene.createIncrementalSnapshot();

            const newEntity = scene.createEntity('NewEntity');
            newEntity.addComponent(new PositionComponent(50, 100));

            const incremental = scene.serializeIncremental();

            expect(incremental.entityChanges.length).toBe(1);
            expect(incremental.entityChanges[0].operation).toBe(ChangeOperation.EntityAdded);
            expect(incremental.entityChanges[0].entityId).toBe(newEntity.id);
            expect(incremental.entityChanges[0].entityName).toBe('NewEntity');
        });

        it('应该检测删除的实体', () => {
            const entity = scene.createEntity('ToDelete');
            scene.createIncrementalSnapshot();

            entity.destroy();

            const incremental = scene.serializeIncremental();

            expect(incremental.entityChanges.length).toBe(1);
            expect(incremental.entityChanges[0].operation).toBe(ChangeOperation.EntityRemoved);
            expect(incremental.entityChanges[0].entityId).toBe(entity.id);
        });

        it('应该检测实体属性变更', () => {
            const entity = scene.createEntity('Entity');
            scene.createIncrementalSnapshot();

            entity.name = 'UpdatedName';
            entity.tag = 99;
            entity.active = false;

            const incremental = scene.serializeIncremental();

            expect(incremental.entityChanges.length).toBe(1);
            expect(incremental.entityChanges[0].operation).toBe(ChangeOperation.EntityUpdated);
            expect(incremental.entityChanges[0].entityData!.name).toBe('UpdatedName');
            expect(incremental.entityChanges[0].entityData!.tag).toBe(99);
            expect(incremental.entityChanges[0].entityData!.active).toBe(false);
        });
    });

    describe('Component Changes Detection', () => {
        it('应该检测新增的组件', () => {
            const entity = scene.createEntity('Entity');
            scene.createIncrementalSnapshot();

            entity.addComponent(new PositionComponent(10, 20));

            const incremental = scene.serializeIncremental();

            expect(incremental.componentChanges.length).toBe(1);
            expect(incremental.componentChanges[0].operation).toBe(ChangeOperation.ComponentAdded);
            expect(incremental.componentChanges[0].entityId).toBe(entity.id);
            expect(incremental.componentChanges[0].componentType).toBe('IncTest_Position');
        });

        it('应该检测删除的组件', () => {
            const entity = scene.createEntity('Entity');
            entity.addComponent(new PositionComponent(10, 20));
            scene.createIncrementalSnapshot();

            entity.removeComponentByType(PositionComponent);

            const incremental = scene.serializeIncremental();

            expect(incremental.componentChanges.length).toBe(1);
            expect(incremental.componentChanges[0].operation).toBe(ChangeOperation.ComponentRemoved);
            expect(incremental.componentChanges[0].componentType).toBe('IncTest_Position');
        });

        it('应该检测组件数据变更', () => {
            const entity = scene.createEntity('Entity');
            const pos = new PositionComponent(10, 20);
            entity.addComponent(pos);
            scene.createIncrementalSnapshot();

            pos.x = 100;
            pos.y = 200;

            const incremental = scene.serializeIncremental();

            expect(incremental.componentChanges.length).toBe(1);
            expect(incremental.componentChanges[0].operation).toBe(ChangeOperation.ComponentUpdated);
            expect(incremental.componentChanges[0].componentData!.data.x).toBe(100);
            expect(incremental.componentChanges[0].componentData!.data.y).toBe(200);
        });

        it('应该检测多个组件变更', () => {
            const entity = scene.createEntity('Entity');
            entity.addComponent(new PositionComponent(10, 20));
            scene.createIncrementalSnapshot();

            entity.addComponent(new VelocityComponent());
            entity.addComponent(new HealthComponent());
            entity.removeComponentByType(PositionComponent);

            const incremental = scene.serializeIncremental();

            expect(incremental.componentChanges.length).toBe(3);
        });
    });

    describe('Scene Data Changes Detection', () => {
        it('应该检测新增的场景数据', () => {
            scene.createIncrementalSnapshot();

            scene.sceneData.set('weather', 'sunny');
            scene.sceneData.set('time', 12.5);

            const incremental = scene.serializeIncremental();

            expect(incremental.sceneDataChanges.length).toBe(2);
        });

        it('应该检测更新的场景数据', () => {
            scene.sceneData.set('weather', 'sunny');
            scene.createIncrementalSnapshot();

            scene.sceneData.set('weather', 'rainy');

            const incremental = scene.serializeIncremental();

            expect(incremental.sceneDataChanges.length).toBe(1);
            expect(incremental.sceneDataChanges[0].key).toBe('weather');
            expect(incremental.sceneDataChanges[0].value).toBe('rainy');
        });

        it('应该检测删除的场景数据', () => {
            scene.sceneData.set('temp', 'value');
            scene.createIncrementalSnapshot();

            scene.sceneData.delete('temp');

            const incremental = scene.serializeIncremental();

            expect(incremental.sceneDataChanges.length).toBe(1);
            expect(incremental.sceneDataChanges[0].deleted).toBe(true);
        });
    });

    describe('Apply Incremental Changes', () => {
        it('应该应用实体添加变更', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            scene1.createIncrementalSnapshot();

            const newEntity = scene1.createEntity('NewEntity');
            newEntity.addComponent(new PositionComponent(50, 100));

            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            scene2.applyIncremental(incremental);

            expect(scene2.entities.count).toBe(1);
            const entity = scene2.findEntity('NewEntity');
            expect(entity).not.toBeNull();
            expect(entity!.hasComponent(PositionComponent)).toBe(true);

            scene1.end();
            scene2.end();
        });

        it('应该应用实体删除变更', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            const entity = scene1.createEntity('ToDelete');
            scene1.createIncrementalSnapshot();

            entity.destroy();
            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            const entity2 = scene2.createEntity('ToDelete');
            Object.defineProperty(entity2, 'id', { value: entity.id, writable: true });

            scene2.applyIncremental(incremental);

            expect(scene2.entities.count).toBe(0);

            scene1.end();
            scene2.end();
        });

        it('应该应用实体属性更新', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            const entity1 = scene1.createEntity('Entity');
            scene1.createIncrementalSnapshot();

            entity1.name = 'UpdatedName';
            entity1.tag = 42;
            entity1.active = false;

            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            const entity2 = scene2.createEntity('Entity');
            Object.defineProperty(entity2, 'id', { value: entity1.id, writable: true });

            scene2.applyIncremental(incremental);

            expect(entity2.name).toBe('UpdatedName');
            expect(entity2.tag).toBe(42);
            expect(entity2.active).toBe(false);

            scene1.end();
            scene2.end();
        });

        it('应该应用组件添加变更', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            const entity1 = scene1.createEntity('Entity');
            scene1.createIncrementalSnapshot();

            entity1.addComponent(new PositionComponent(100, 200));

            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            const entity2 = scene2.createEntity('Entity');
            Object.defineProperty(entity2, 'id', { value: entity1.id, writable: true });

            scene2.applyIncremental(incremental);

            expect(entity2.hasComponent(PositionComponent)).toBe(true);
            const pos = entity2.getComponent(PositionComponent);
            expect(pos!.x).toBe(100);
            expect(pos!.y).toBe(200);

            scene1.end();
            scene2.end();
        });

        it('应该应用组件删除变更', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            const entity1 = scene1.createEntity('Entity');
            entity1.addComponent(new PositionComponent(10, 20));
            scene1.createIncrementalSnapshot();

            entity1.removeComponentByType(PositionComponent);

            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            const entity2 = scene2.createEntity('Entity');
            Object.defineProperty(entity2, 'id', { value: entity1.id, writable: true });
            entity2.addComponent(new PositionComponent(10, 20));

            scene2.applyIncremental(incremental);

            expect(entity2.hasComponent(PositionComponent)).toBe(false);

            scene1.end();
            scene2.end();
        });

        it('应该应用组件数据更新', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            const entity1 = scene1.createEntity('Entity');
            const pos1 = new PositionComponent(10, 20);
            entity1.addComponent(pos1);
            scene1.createIncrementalSnapshot();

            pos1.x = 100;
            pos1.y = 200;

            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            const entity2 = scene2.createEntity('Entity');
            Object.defineProperty(entity2, 'id', { value: entity1.id, writable: true });
            entity2.addComponent(new PositionComponent(10, 20));

            scene2.applyIncremental(incremental);

            const pos2 = entity2.getComponent(PositionComponent);
            expect(pos2!.x).toBe(100);
            expect(pos2!.y).toBe(200);

            scene1.end();
            scene2.end();
        });

        it('应该应用场景数据变更', () => {
            const scene1 = new Scene({ name: 'Scene1' });
            scene1.createIncrementalSnapshot();

            scene1.sceneData.set('weather', 'sunny');
            scene1.sceneData.set('time', 12.5);

            const incremental = scene1.serializeIncremental();

            const scene2 = new Scene({ name: 'Scene2' });
            scene2.applyIncremental(incremental);

            expect(scene2.sceneData.get('weather')).toBe('sunny');
            expect(scene2.sceneData.get('time')).toBe(12.5);

            scene1.end();
            scene2.end();
        });
    });

    describe('Incremental Serialization', () => {
        it('应该序列化和反序列化增量快照', () => {
            scene.createIncrementalSnapshot();

            const entity = scene.createEntity('Entity');
            entity.addComponent(new PositionComponent(50, 100));

            const incremental = scene.serializeIncremental();
            const json = IncrementalSerializer.serializeIncremental(incremental);

            expect(typeof json).toBe('string');

            const deserialized = IncrementalSerializer.deserializeIncremental(json);
            expect(deserialized.version).toBe(incremental.version);
            expect(deserialized.entityChanges.length).toBe(incremental.entityChanges.length);
        });

        it('应该美化JSON输出', () => {
            scene.createIncrementalSnapshot();
            const entity = scene.createEntity('Entity');
            entity.addComponent(new PositionComponent(10, 20));

            const incremental = scene.serializeIncremental();
            const prettyJson = IncrementalSerializer.serializeIncremental(incremental, true);

            expect(prettyJson).toContain('\n');
            expect(prettyJson).toContain('  ');
        });
    });

    describe('Snapshot Management', () => {
        it('应该更新增量快照基准', () => {
            const entity = scene.createEntity('Entity');
            scene.createIncrementalSnapshot();

            entity.addComponent(new PositionComponent(10, 20));
            const incremental1 = scene.serializeIncremental();

            scene.updateIncrementalSnapshot();

            const pos = entity.getComponent(PositionComponent)!;
            pos.x = 100;

            const incremental2 = scene.serializeIncremental();

            // incremental2应该只包含Position的更新，不包含添加
            expect(incremental1.componentChanges.length).toBe(1);
            expect(incremental2.componentChanges.length).toBe(1);
            expect(incremental2.componentChanges[0].operation).toBe(ChangeOperation.ComponentUpdated);
        });

        it('应该清除增量快照', () => {
            scene.createIncrementalSnapshot();
            expect(scene.hasIncrementalSnapshot()).toBe(true);

            scene.clearIncrementalSnapshot();
            expect(scene.hasIncrementalSnapshot()).toBe(false);
        });

        it('应该在没有快照时抛出错误', () => {
            expect(() => {
                scene.serializeIncremental();
            }).toThrow('必须先调用 createIncrementalSnapshot() 创建基础快照');
        });
    });

    describe('Statistics and Utilities', () => {
        it('应该计算增量快照大小', () => {
            scene.createIncrementalSnapshot();
            const entity = scene.createEntity('Entity');
            entity.addComponent(new PositionComponent(10, 20));

            const incremental = scene.serializeIncremental();
            const size = IncrementalSerializer.getIncrementalSize(incremental);

            expect(size).toBeGreaterThan(0);
        });

        it('应该提供增量快照统计信息', () => {
            const entity1 = scene.createEntity('Entity1');
            entity1.addComponent(new PositionComponent(10, 20));
            scene.createIncrementalSnapshot();

            const entity2 = scene.createEntity('Entity2');
            entity2.addComponent(new VelocityComponent());
            entity1.destroy();

            const incremental = scene.serializeIncremental();
            const stats = IncrementalSerializer.getIncrementalStats(incremental);

            expect(stats.addedEntities).toBe(1);
            expect(stats.removedEntities).toBe(1);
            expect(stats.addedComponents).toBe(1);
            expect(stats.totalChanges).toBeGreaterThan(0);
        });
    });

    describe('Performance and Edge Cases', () => {
        it('应该处理大量实体变更', () => {
            scene.createIncrementalSnapshot();

            for (let i = 0; i < 100; i++) {
                const entity = scene.createEntity(`Entity_${i}`);
                entity.addComponent(new PositionComponent(i, i * 2));
            }

            const incremental = scene.serializeIncremental();

            expect(incremental.entityChanges.length).toBe(100);
            expect(incremental.componentChanges.length).toBe(100);
        });

        it('应该处理空变更', () => {
            scene.createIncrementalSnapshot();

            const incremental = scene.serializeIncremental();

            expect(incremental.entityChanges.length).toBe(0);
            expect(incremental.componentChanges.length).toBe(0);
            expect(incremental.sceneDataChanges.length).toBe(0);
        });

        it('应该处理复杂嵌套场景数据', () => {
            scene.createIncrementalSnapshot();

            scene.sceneData.set('config', {
                nested: {
                    deep: {
                        value: 42
                    }
                },
                array: [1, 2, 3]
            });

            const incremental = scene.serializeIncremental();
            const scene2 = new Scene({ name: 'Scene2' });
            scene2.applyIncremental(incremental);

            const config = scene2.sceneData.get('config');
            expect(config.nested.deep.value).toBe(42);
            expect(config.array).toEqual([1, 2, 3]);

            scene2.end();
        });

        it('应该正确处理快照版本号', () => {
            IncrementalSerializer.resetVersion();

            const snapshot1 = IncrementalSerializer.createSnapshot(scene);
            expect(snapshot1.version).toBe(1);

            const snapshot2 = IncrementalSerializer.createSnapshot(scene);
            expect(snapshot2.version).toBe(2);
        });
    });
});