const { describe, it, beforeEach, afterEach, before, after } = require('mocha');
const { expect } = require('chai');
const sinon = require('sinon');
const { validateRequest } = require('../../middleware/validation');
const Joi = require('joi');
const { mockRequest, mockResponse, mockNext } = require('../setup');

describe('Validation Middleware', () => {
  
  describe('validateRequest', () => {
    const testSchema = Joi.object({
      name: Joi.string().required(),
      email: Joi.string().email().required(),
      age: Joi.number().integer().min(0).max(120).optional(),
      tags: Joi.array().items(Joi.string()).optional()
    });

    it('should pass validation with valid data', () => {
      const req = mockRequest({
        body: {
          name: 'John Doe',
          email: 'john@example.com',
          age: 30,
          tags: ['admin', 'user']
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(next.errors).to.have.length(0);
      expect(req.body).to.deep.equal({
        name: 'John Doe',
        email: 'john@example.com',
        age: 30,
        tags: ['admin', 'user']
      });
    });

    it('should fail validation with missing required field', () => {
      const req = mockRequest({
        body: {
          email: 'john@example.com'
          // missing name
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(res.statusCode).to.equal(400);
      expect(res.data.success).to.be.false;
      expect(res.data.message).to.include('name');
    });

    it('should fail validation with invalid email', () => {
      const req = mockRequest({
        body: {
          name: 'John Doe',
          email: 'invalid-email'
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(res.statusCode).to.equal(400);
      expect(res.data.success).to.be.false;
      expect(res.data.message).to.include('email');
    });

    it('should fail validation with invalid age', () => {
      const req = mockRequest({
        body: {
          name: 'John Doe',
          email: 'john@example.com',
          age: -5
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(res.statusCode).to.equal(400);
      expect(res.data.success).to.be.false;
      expect(res.data.message).to.include('age');
    });

    it('should strip unknown fields', () => {
      const req = mockRequest({
        body: {
          name: 'John Doe',
          email: 'john@example.com',
          unknownField: 'should be removed'
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(next.errors).to.have.length(0);
      expect(req.body).to.not.have.property('unknownField');
    });

    it('should handle array validation', () => {
      const req = mockRequest({
        body: {
          name: 'John Doe',
          email: 'john@example.com',
          tags: ['valid', 'tags']
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(next.errors).to.have.length(0);
      expect(req.body.tags).to.deep.equal(['valid', 'tags']);
    });

    it('should fail with invalid array items', () => {
      const req = mockRequest({
        body: {
          name: 'John Doe',
          email: 'john@example.com',
          tags: ['valid', 123, 'invalid-number']
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(res.statusCode).to.equal(400);
      expect(res.data.success).to.be.false;
    });

    it('should handle nested object validation', () => {
      const nestedSchema = Joi.object({
        user: Joi.object({
          name: Joi.string().required(),
          profile: Joi.object({
            age: Joi.number().required(),
            preferences: Joi.array().items(Joi.string())
          }).required()
        }).required()
      });

      const req = mockRequest({
        body: {
          user: {
            name: 'John',
            profile: {
              age: 30,
              preferences: ['dark-mode', 'notifications']
            }
          }
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(nestedSchema);
      middleware(req, res, next);

      expect(next.errors).to.have.length(0);
    });

    it('should provide detailed error messages', () => {
      const req = mockRequest({
        body: {
          name: '',
          email: 'invalid',
          age: 150
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(testSchema);
      middleware(req, res, next);

      expect(res.statusCode).to.equal(400);
      expect(res.data.success).to.be.false;
      expect(res.data.message).to.be.a('string');
      expect(res.data.details).to.be.an('array');
      expect(res.data.details.length).to.be.greaterThan(0);
    });

    it('should handle alternative schemas', () => {
      const altSchema = Joi.alternatives().try(
        Joi.object({
          type: Joi.string().valid('user').required(),
          username: Joi.string().required()
        }),
        Joi.object({
          type: Joi.string().valid('device').required(),
          deviceId: Joi.number().required()
        })
      );

      const req1 = mockRequest({
        body: {
          type: 'user',
          username: 'john'
        }
      });
      const res1 = mockResponse();
      const next1 = mockNext();

      const middleware1 = validateRequest(altSchema);
      middleware1(req1, res1, next1);

      expect(next1.errors).to.have.length(0);

      const req2 = mockRequest({
        body: {
          type: 'device',
          deviceId: 123
        }
      });
      const res2 = mockResponse();
      const next2 = mockNext();

      const middleware2 = validateRequest(altSchema);
      middleware2(req2, res2, next2);

      expect(next2.errors).to.have.length(0);
    });

    it('should handle query parameter validation', () => {
      const querySchema = Joi.object({
        page: Joi.number().integer().min(1).default(1),
        limit: Joi.number().integer().min(1).max(100).default(10),
        search: Joi.string().optional()
      });

      const req = mockRequest({
        query: {
          page: '2',
          limit: '20',
          search: 'test'
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(querySchema, 'query');
      middleware(req, res, next);

      expect(next.errors).to.have.length(0);
      expect(req.query.page).to.equal(2); // Should be converted to number
      expect(req.query.limit).to.equal(20);
    });

    it('should handle params validation', () => {
      const paramsSchema = Joi.object({
        id: Joi.number().integer().positive().required(),
        slug: Joi.string().alphanum().optional()
      });

      const req = mockRequest({
        params: {
          id: '123',
          slug: 'test-slug'
        }
      });
      const res = mockResponse();
      const next = mockNext();

      const middleware = validateRequest(paramsSchema, 'params');
      middleware(req, res, next);

      expect(next.errors).to.have.length(0);
      expect(req.params.id).to.equal(123);
    });
  });
});