/**
 * Elements API Tests – CRUD (List / Create / Update / Delete)
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import type { FastifyInstance } from 'fastify';
import { SqliteAdapter } from '../src/database/SqliteAdapter.js';
import { createServer } from '../src/server.js';

describe('Elements API', () => {
  let app: FastifyInstance;
  let db: SqliteAdapter;
  let drawingId: string;
  let layerId: string;
  let createdElementId: string;

  beforeAll(async () => {
    db = new SqliteAdapter(':memory:');
    await db.init();
    app = await createServer({ db, port: 0 });
    await app.ready();

    // Create project → drawing → layer hierarchy
    const projRes = await app.inject({
      method: 'POST',
      url: '/api/projects',
      payload: { name: 'Elements Test Project' },
    });
    const projectId = JSON.parse(projRes.body).id;

    const drawRes = await app.inject({
      method: 'POST',
      url: `/api/projects/${projectId}/drawings`,
      payload: { name: 'Elements Test Drawing' },
    });
    drawingId = JSON.parse(drawRes.body).id;

    const layerRes = await app.inject({
      method: 'POST',
      url: `/api/drawings/${drawingId}/layers`,
      payload: { name: 'Elements Layer' },
    });
    layerId = JSON.parse(layerRes.body).id;
  });

  afterAll(async () => {
    await app.close();
    db.close();
  });

  // ─── Create ─────────────────────────────────────────

  describe('POST /api/drawings/:drawingId/elements', () => {
    it('should create an element with 201', async () => {
      const response = await app.inject({
        method: 'POST',
        url: `/api/drawings/${drawingId}/elements`,
        payload: { layer_id: layerId, type: 'rect', x: 10, y: 20, width: 100, height: 50 },
      });
      expect(response.statusCode).toBe(201);
      const body = JSON.parse(response.body);
      expect(body.id).toBeDefined();
      expect(body.type).toBe('rect');
      expect(body.x).toBe(10);
      expect(body.y).toBe(20);
      expect(body.width).toBe(100);
      expect(body.height).toBe(50);
      expect(body.drawing_id).toBe(drawingId);
      expect(body.layer_id).toBe(layerId);
      createdElementId = body.id;
    });

    it('should create an element with default values', async () => {
      const response = await app.inject({
        method: 'POST',
        url: `/api/drawings/${drawingId}/elements`,
        payload: { layer_id: layerId, type: 'circle' },
      });
      expect(response.statusCode).toBe(201);
      const body = JSON.parse(response.body);
      expect(body.type).toBe('circle');
      expect(body.x).toBe(0);
      expect(body.y).toBe(0);
      expect(body.width).toBe(0);
      expect(body.height).toBe(0);
      expect(body.properties_json).toBe('{}');
    });
  });

  // ─── List ───────────────────────────────────────────

  describe('GET /api/drawings/:drawingId/elements', () => {
    it('should list elements for a drawing', async () => {
      const response = await app.inject({
        method: 'GET',
        url: `/api/drawings/${drawingId}/elements`,
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(Array.isArray(body)).toBe(true);
      expect(body.length).toBeGreaterThanOrEqual(2);
    });

    it('should return empty array for drawing with no elements', async () => {
      // Create a new drawing with no elements
      const projRes = await app.inject({
        method: 'POST',
        url: '/api/projects',
        payload: { name: 'Empty Elements Project' },
      });
      const projId = JSON.parse(projRes.body).id;
      const drawRes = await app.inject({
        method: 'POST',
        url: `/api/projects/${projId}/drawings`,
        payload: { name: 'Empty Drawing' },
      });
      const emptyDrawId = JSON.parse(drawRes.body).id;

      const response = await app.inject({
        method: 'GET',
        url: `/api/drawings/${emptyDrawId}/elements`,
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(Array.isArray(body)).toBe(true);
      expect(body.length).toBe(0);
    });
  });

  // ─── Update ─────────────────────────────────────────

  describe('PATCH /api/elements/:id', () => {
    it('should update element position', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: `/api/elements/${createdElementId}`,
        payload: { x: 100, y: 200 },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.x).toBe(100);
      expect(body.y).toBe(200);
    });

    it('should update element dimensions', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: `/api/elements/${createdElementId}`,
        payload: { width: 300, height: 150 },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.width).toBe(300);
      expect(body.height).toBe(150);
    });

    it('should update element properties_json', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: `/api/elements/${createdElementId}`,
        payload: { properties_json: '{"color":"red"}' },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.properties_json).toBe('{"color":"red"}');
    });

    it('should return 404 for non-existent element update', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: '/api/elements/non-existent-id',
        payload: { x: 0 },
      });
      expect(response.statusCode).toBe(404);
    });
  });

  // ─── Delete ─────────────────────────────────────────

  describe('DELETE /api/elements/:id', () => {
    it('should delete an element', async () => {
      // Create an element to delete
      const createRes = await app.inject({
        method: 'POST',
        url: `/api/drawings/${drawingId}/elements`,
        payload: { layer_id: layerId, type: 'line' },
      });
      const elemId = JSON.parse(createRes.body).id;

      const response = await app.inject({
        method: 'DELETE',
        url: `/api/elements/${elemId}`,
      });
      expect(response.statusCode).toBe(204);

      // Verify it's gone via list
      const listRes = await app.inject({
        method: 'GET',
        url: `/api/drawings/${drawingId}/elements`,
      });
      const elements = JSON.parse(listRes.body);
      expect(elements.find((e: any) => e.id === elemId)).toBeUndefined();
    });

    it('should return 404 for non-existent element delete', async () => {
      const response = await app.inject({
        method: 'DELETE',
        url: '/api/elements/non-existent-id',
      });
      expect(response.statusCode).toBe(404);
    });
  });
});