/**
 * Layers 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('Layers API', () => {
  let app: FastifyInstance;
  let db: SqliteAdapter;
  let drawingId: string;
  let createdLayerId: string;

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

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

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

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

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

  describe('POST /api/drawings/:drawingId/layers', () => {
    it('should create a layer with 201', async () => {
      const response = await app.inject({
        method: 'POST',
        url: `/api/drawings/${drawingId}/layers`,
        payload: { name: 'Background', color: '#ff0000' },
      });
      expect(response.statusCode).toBe(201);
      const body = JSON.parse(response.body);
      expect(body.id).toBeDefined();
      expect(body.name).toBe('Background');
      expect(body.color).toBe('#ff0000');
      expect(body.drawing_id).toBe(drawingId);
      createdLayerId = body.id;
    });

    it('should create a layer with default values', async () => {
      const response = await app.inject({
        method: 'POST',
        url: `/api/drawings/${drawingId}/layers`,
        payload: {},
      });
      expect(response.statusCode).toBe(201);
      const body = JSON.parse(response.body);
      expect(body.name).toBe('Layer');
      expect(body.visible).toBe(1);
      expect(body.locked).toBe(0);
      expect(body.color).toBe('#ffffff');
      expect(body.line_type).toBe('solid');
    });
  });

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

  describe('GET /api/drawings/:drawingId/layers', () => {
    it('should list layers for a drawing', async () => {
      const response = await app.inject({
        method: 'GET',
        url: `/api/drawings/${drawingId}/layers`,
      });
      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 layers', async () => {
      // Create a new drawing with no layers
      const projRes = await app.inject({
        method: 'POST',
        url: '/api/projects',
        payload: { name: 'Empty Layers 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}/layers`,
      });
      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/layers/:id', () => {
    it('should update layer name', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: `/api/layers/${createdLayerId}`,
        payload: { name: 'Updated Layer Name' },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.name).toBe('Updated Layer Name');
    });

    it('should update layer visibility', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: `/api/layers/${createdLayerId}`,
        payload: { visible: 0, locked: 1 },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.visible).toBe(0);
      expect(body.locked).toBe(1);
    });

    it('should update layer color and line_type', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: `/api/layers/${createdLayerId}`,
        payload: { color: '#00ff00', line_type: 'dashed' },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.color).toBe('#00ff00');
      expect(body.line_type).toBe('dashed');
    });

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

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

  describe('DELETE /api/layers/:id', () => {
    it('should delete a layer', async () => {
      // Create a layer to delete
      const createRes = await app.inject({
        method: 'POST',
        url: `/api/drawings/${drawingId}/layers`,
        payload: { name: 'To Be Deleted' },
      });
      const layerId = JSON.parse(createRes.body).id;

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

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

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