import { describe, it, expect, vi, beforeEach } from 'vitest';
import { ExportManager } from '../src/export.js';
import { DesignState } from '../src/state.js';
import { Vector2 } from '../tests/__mocks__/three.js';

function makeMockRenderer() {
  return {
    renderer: {
      getSize: vi.fn((v) => v.set(800, 600)),
      getPixelRatio: vi.fn(() => 1),
      setSize: vi.fn(),
      setPixelRatio: vi.fn(),
      render: vi.fn(),
      domElement: {
        toDataURL: vi.fn(() => 'data:image/png;base64,mock')
      }
    },
    camera: {
      aspect: 800 / 600,
      updateProjectionMatrix: vi.fn()
    },
    scene: {},
    container: {
      dispatchEvent: vi.fn()
    },
    houseData: {
      floors: [{ id: 'eg', rooms: [{ id: 'r1', name: 'Room1' }] }]
    },
    currentFloor: 0,
    designData: null,
    _clearFloor: vi.fn(),
    _renderRoom: vi.fn(),
    _placeFurnitureForFloor: vi.fn()
  };
}

function makeDesign() {
  return {
    name: 'Test Design',
    rooms: [{ roomId: 'r1', furniture: [{ catalogId: 'c1', position: { x: 1, z: 2 }, rotation: 0 }] }]
  };
}

describe('ExportManager', () => {
  let exportMgr, state, mockRenderer;

  beforeEach(() => {
    // Stub DOM APIs
    globalThis.URL = { createObjectURL: vi.fn(() => 'blob:url'), revokeObjectURL: vi.fn() };
    globalThis.Blob = class Blob { constructor(parts, opts) { this.parts = parts; this.type = opts?.type; } };
    globalThis.document = globalThis.document || {};
    globalThis.document.createElement = (tag) => {
      return { href: '', download: '', click: vi.fn(), type: '', accept: '', files: [], addEventListener: vi.fn() };
    };

    state = new DesignState(makeDesign());
    mockRenderer = makeMockRenderer();
    exportMgr = new ExportManager(mockRenderer, state);
  });

  describe('exportDesignJSON', () => {
    it('creates a download with correct filename', () => {
      const mockAnchor = { href: '', download: '', click: vi.fn() };
      globalThis.document.createElement = () => mockAnchor;

      exportMgr.exportDesignJSON();

      expect(mockAnchor.download).toBe('Test Design.json');
      expect(mockAnchor.click).toHaveBeenCalled();
    });

    it('includes exportedAt timestamp', () => {
      let blobContent = '';
      globalThis.Blob = class {
        constructor(parts) { blobContent = parts[0]; }
      };
      globalThis.document.createElement = () => ({ href: '', download: '', click: vi.fn() });

      exportMgr.exportDesignJSON();
      const data = JSON.parse(blobContent);
      expect(data.exportedAt).toBeDefined();
      expect(new Date(data.exportedAt).getTime()).not.toBeNaN();
    });

    it('exports current state data', () => {
      let blobContent = '';
      globalThis.Blob = class {
        constructor(parts) { blobContent = parts[0]; }
      };
      globalThis.document.createElement = () => ({ href: '', download: '', click: vi.fn() });

      exportMgr.exportDesignJSON();
      const data = JSON.parse(blobContent);
      expect(data.name).toBe('Test Design');
      expect(data.rooms).toHaveLength(1);
      expect(data.rooms[0].furniture[0].catalogId).toBe('c1');
    });

    it('uses "design" as fallback filename', () => {
      // State with no name
      state.loadDesign({ rooms: [] });
      const mockAnchor = { href: '', download: '', click: vi.fn() };
      globalThis.document.createElement = () => mockAnchor;

      exportMgr.exportDesignJSON();
      expect(mockAnchor.download).toBe('design.json');
    });
  });

  describe('_loadDesignFile', () => {
    it('loads valid design file', async () => {
      const design = { name: 'Loaded', rooms: [{ roomId: 'r2', furniture: [] }] };
      const file = { text: () => Promise.resolve(JSON.stringify(design)), name: 'loaded.json' };

      await exportMgr._loadDesignFile(file);

      expect(state.design.name).toBe('Loaded');
      expect(state.design.rooms).toHaveLength(1);
    });

    it('rejects file without rooms array', async () => {
      const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
      const file = { text: () => Promise.resolve('{"name": "bad"}'), name: 'bad.json' };

      await exportMgr._loadDesignFile(file);

      expect(mockRenderer.container.dispatchEvent).toHaveBeenCalled();
      const event = mockRenderer.container.dispatchEvent.mock.calls.find(
        c => c[0].type === 'loaderror'
      );
      expect(event).toBeDefined();
      errorSpy.mockRestore();
    });

    it('rejects invalid JSON', async () => {
      const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
      const file = { text: () => Promise.resolve('not json'), name: 'bad.json' };

      await exportMgr._loadDesignFile(file);

      expect(mockRenderer.container.dispatchEvent).toHaveBeenCalled();
      errorSpy.mockRestore();
    });

    it('dispatches designloaded event on success', async () => {
      const design = { name: 'Success', rooms: [{ roomId: 'r1', furniture: [] }] };
      const file = { text: () => Promise.resolve(JSON.stringify(design)), name: 'test.json' };

      await exportMgr._loadDesignFile(file);

      const event = mockRenderer.container.dispatchEvent.mock.calls.find(
        c => c[0].type === 'designloaded'
      );
      expect(event).toBeDefined();
      expect(event[0].detail.name).toBe('Success');
    });
  });

  describe('exportScreenshot', () => {
    it('renders at requested resolution', () => {
      const mockAnchor = { href: '', download: '', click: vi.fn() };
      globalThis.document.createElement = () => mockAnchor;

      exportMgr.exportScreenshot(1920, 1080);

      expect(mockRenderer.renderer.setSize).toHaveBeenCalledWith(1920, 1080);
      expect(mockRenderer.renderer.render).toHaveBeenCalled();
      expect(mockAnchor.download).toBe('house-design.png');
    });

    it('restores original renderer size after capture', () => {
      const mockAnchor = { href: '', download: '', click: vi.fn() };
      globalThis.document.createElement = () => mockAnchor;

      exportMgr.exportScreenshot();

      // setSize called twice: once for capture, once to restore
      expect(mockRenderer.renderer.setSize).toHaveBeenCalledTimes(2);
      // Last call restores original 800x600
      const lastCall = mockRenderer.renderer.setSize.mock.calls[1];
      expect(lastCall).toEqual([800, 600]);
    });

    it('updates camera projection matrix twice', () => {
      globalThis.document.createElement = () => ({ href: '', download: '', click: vi.fn() });
      exportMgr.exportScreenshot();
      expect(mockRenderer.camera.updateProjectionMatrix).toHaveBeenCalledTimes(2);
    });
  });
});