'use strict'

var after = require('after');
var express = require('../')
  , Router = express.Router
  , methods = require('../lib/utils').methods
  , assert = require('node:assert');

describe('Router', function () {
  it('should return a function with router methods', function () {
    var router = new Router();
    assert(typeof router === 'function')

    assert(typeof router.get === 'function')
    assert(typeof router.handle === 'function')
    assert(typeof router.use === 'function')
  });

  it('should support .use of other routers', function (done) {
    var router = new Router();
    var another = new Router();

    another.get('/bar', function (req, res) {
      res.end();
    });
    router.use('/foo', another);

    router.handle({ url: '/foo/bar', method: 'GET' }, { end: done }, function () { });
  });

  it('should support dynamic routes', function (done) {
    var router = new Router();
    var another = new Router();

    another.get('/:bar', function (req, res) {
      assert.strictEqual(req.params.bar, 'route')
      res.end();
    });
    router.use('/:foo', another);

    router.handle({ url: '/test/route', method: 'GET' }, { end: done }, function () { });
  });

  it('should handle blank URL', function (done) {
    var router = new Router();

    router.use(function (req, res) {
      throw new Error('should not be called')
    });

    router.handle({ url: '', method: 'GET' }, {}, done);
  });

  it('should handle missing URL', function (done) {
    var router = new Router()

    router.use(function (req, res) {
      throw new Error('should not be called')
    })

    router.handle({ method: 'GET' }, {}, done)
  })

  it('handle missing method', function (done) {
    var all = false
    var router = new Router()
    var route = router.route('/foo')
    var use = false

    route.post(function (req, res, next) { next(new Error('should not run')) })
    route.all(function (req, res, next) {
      all = true
      next()
    })
    route.get(function (req, res, next) { next(new Error('should not run')) })

    router.get('/foo', function (req, res, next) { next(new Error('should not run')) })
    router.use(function (req, res, next) {
      use = true
      next()
    })

    router.handle({ url: '/foo' }, {}, function (err) {
      if (err) return done(err)
      assert.ok(all)
      assert.ok(use)
      done()
    })
  })

  it('should not stack overflow with many registered routes', function (done) {
    this.timeout(5000) // long-running test

    var handler = function (req, res) { res.end(new Error('wrong handler')) };
    var router = new Router();

    for (var i = 0; i < 6000; i++) {
      router.get('/thing' + i, handler)
    }

    router.get('/', function (req, res) {
      res.end();
    });

    router.handle({ url: '/', method: 'GET' }, { end: done }, function () { });
  });

  it('should not stack overflow with a large sync route stack', function (done) {
    this.timeout(5000) // long-running test

    var router = new Router()

    router.get('/foo', function (req, res, next) {
      req.counter = 0
      next()
    })

    for (var i = 0; i < 6000; i++) {
      router.get('/foo', function (req, res, next) {
        req.counter++
        next()
      })
    }

    router.get('/foo', function (req, res) {
      assert.strictEqual(req.counter, 6000)
      res.end()
    })

    router.handle({ url: '/foo', method: 'GET' }, { end: done }, function (err) {
      assert(!err, err);
    });
  })

  it('should not stack overflow with a large sync middleware stack', function (done) {
    this.timeout(5000) // long-running test

    var router = new Router()

    router.use(function (req, res, next) {
      req.counter = 0
      next()
    })

    for (var i = 0; i < 6000; i++) {
      router.use(function (req, res, next) {
        req.counter++
        next()
      })
    }

    router.use(function (req, res) {
      assert.strictEqual(req.counter, 6000)
      res.end()
    })

    router.handle({ url: '/', method: 'GET' }, { end: done }, function (err) {
      assert(!err, err);
    })
  })

  describe('.handle', function () {
    it('should dispatch', function (done) {
      var router = new Router();

      router.route('/foo').get(function (req, res) {
        res.send('foo');
      });

      var res = {
        send: function (val) {
          assert.strictEqual(val, 'foo')
          done();
        }
      }
      router.handle({ url: '/foo', method: 'GET' }, res, function () { });
    })
  })

  describe('.multiple callbacks', function () {
    it('should throw if a callback is null', function () {
      assert.throws(function () {
        var router = new Router();
        router.route('/foo').all(null);
      })
    })

    it('should throw if a callback is undefined', function () {
      assert.throws(function () {
        var router = new Router();
        router.route('/foo').all(undefined);
      })
    })

    it('should throw if a callback is not a function', function () {
      assert.throws(function () {
        var router = new Router();
        router.route('/foo').all('not a function');
      })
    })

    it('should not throw if all callbacks are functions', function () {
      var router = new Router();
      router.route('/foo').all(function () { }).all(function () { });
    })
  })

  describe('error', function () {
    it('should skip non error middleware', function (done) {
      var router = new Router();

      router.get('/foo', function (req, res, next) {
        next(new Error('foo'));
      });

      router.get('/bar', function (req, res, next) {
        next(new Error('bar'));
      });

      router.use(function (req, res, next) {
        assert(false);
      });

      router.use(function (err, req, res, next) {
        assert.equal(err.message, 'foo');
        done();
      });

      router.handle({ url: '/foo', method: 'GET' }, {}, done);
    });

    it('should handle throwing inside routes with params', function (done) {
      var router = new Router();

      router.get('/foo/:id', function () {
        throw new Error('foo');
      });

      router.use(function (req, res, next) {
        assert(false);
      });

      router.use(function (err, req, res, next) {
        assert.equal(err.message, 'foo');
        done();
      });

      router.handle({ url: '/foo/2', method: 'GET' }, {}, function () { });
    });

    it('should handle throwing in handler after async param', function (done) {
      var router = new Router();

      router.param('user', function (req, res, next, val) {
        process.nextTick(function () {
          req.user = val;
          next();
        });
      });

      router.use('/:user', function (req, res, next) {
        throw new Error('oh no!');
      });

      router.use(function (err, req, res, next) {
        assert.equal(err.message, 'oh no!');
        done();
      });

      router.handle({ url: '/bob', method: 'GET' }, {}, function () { });
    });

    it('should handle throwing inside error handlers', function (done) {
      var router = new Router();

      router.use(function (req, res, next) {
        throw new Error('boom!');
      });

      router.use(function (err, req, res, next) {
        throw new Error('oops');
      });

      router.use(function (err, req, res, next) {
        assert.equal(err.message, 'oops');
        done();
      });

      router.handle({ url: '/', method: 'GET' }, {}, done);
    });
  })

  describe('FQDN', function () {
    it('should not obscure FQDNs', function (done) {
      var request = { hit: 0, url: 'http://example.com/foo', method: 'GET' };
      var router = new Router();

      router.use(function (req, res, next) {
        assert.equal(req.hit++, 0);
        assert.equal(req.url, 'http://example.com/foo');
        next();
      });

      router.handle(request, {}, function (err) {
        if (err) return done(err);
        assert.equal(request.hit, 1);
        done();
      });
    });

    it('should ignore FQDN in search', function (done) {
      var request = { hit: 0, url: '/proxy?url=http://example.com/blog/post/1', method: 'GET' };
      var router = new Router();

      router.use('/proxy', function (req, res, next) {
        assert.equal(req.hit++, 0);
        assert.equal(req.url, '/?url=http://example.com/blog/post/1');
        next();
      });

      router.handle(request, {}, function (err) {
        if (err) return done(err);
        assert.equal(request.hit, 1);
        done();
      });
    });

    it('should ignore FQDN in path', function (done) {
      var request = { hit: 0, url: '/proxy/http://example.com/blog/post/1', method: 'GET' };
      var router = new Router();

      router.use('/proxy', function (req, res, next) {
        assert.equal(req.hit++, 0);
        assert.equal(req.url, '/http://example.com/blog/post/1');
        next();
      });

      router.handle(request, {}, function (err) {
        if (err) return done(err);
        assert.equal(request.hit, 1);
        done();
      });
    });

    it('should adjust FQDN req.url', function (done) {
      var request = { hit: 0, url: 'http://example.com/blog/post/1', method: 'GET' };
      var router = new Router();

      router.use('/blog', function (req, res, next) {
        assert.equal(req.hit++, 0);
        assert.equal(req.url, 'http://example.com/post/1');
        next();
      });

      router.handle(request, {}, function (err) {
        if (err) return done(err);
        assert.equal(request.hit, 1);
        done();
      });
    });

    it('should adjust FQDN req.url with multiple handlers', function (done) {
      var request = { hit: 0, url: 'http://example.com/blog/post/1', method: 'GET' };
      var router = new Router();

      router.use(function (req, res, next) {
        assert.equal(req.hit++, 0);
        assert.equal(req.url, 'http://example.com/blog/post/1');
        next();
      });

      router.use('/blog', function (req, res, next) {
        assert.equal(req.hit++, 1);
        assert.equal(req.url, 'http://example.com/post/1');
        next();
      });

      router.handle(request, {}, function (err) {
        if (err) return done(err);
        assert.equal(request.hit, 2);
        done();
      });
    });

    it('should adjust FQDN req.url with multiple routed handlers', function (done) {
      var request = { hit: 0, url: 'http://example.com/blog/post/1', method: 'GET' };
      var router = new Router();

      router.use('/blog', function (req, res, next) {
        assert.equal(req.hit++, 0);
        assert.equal(req.url, 'http://example.com/post/1');
        next();
      });

      router.use('/blog', function (req, res, next) {
        assert.equal(req.hit++, 1);
        assert.equal(req.url, 'http://example.com/post/1');
        next();
      });

      router.use(function (req, res, next) {
        assert.equal(req.hit++, 2);
        assert.equal(req.url, 'http://example.com/blog/post/1');
        next();
      });

      router.handle(request, {}, function (err) {
        if (err) return done(err);
        assert.equal(request.hit, 3);
        done();
      });
    });
  })

  describe('.all', function () {
    it('should support using .all to capture all http verbs', function (done) {
      var router = new Router();

      var count = 0;
      router.all('/foo', function () { count++; });

      var url = '/foo?bar=baz';

      methods.forEach(function testMethod(method) {
        router.handle({ url: url, method: method }, {}, function () { });
      });

      assert.equal(count, methods.length);
      done();
    })
  })

  describe('.use', function () {
    it('should require middleware', function () {
      var router = new Router()
      assert.throws(function () { router.use('/') }, /argument handler is required/)
    })

    it('should reject string as middleware', function () {
      var router = new Router()
      assert.throws(function () { router.use('/', 'foo') }, /argument handler must be a function/)
    })

    it('should reject number as middleware', function () {
      var router = new Router()
      assert.throws(function () { router.use('/', 42) }, /argument handler must be a function/)
    })

    it('should reject null as middleware', function () {
      var router = new Router()
      assert.throws(function () { router.use('/', null) }, /argument handler must be a function/)
    })

    it('should reject Date as middleware', function () {
      var router = new Router()
      assert.throws(function () { router.use('/', new Date()) }, /argument handler must be a function/)
    })

    it('should be called for any URL', function (done) {
      var cb = after(4, done)
      var router = new Router()

      function no() {
        throw new Error('should not be called')
      }

      router.use(function (req, res) {
        res.end()
      })

      router.handle({ url: '/', method: 'GET' }, { end: cb }, no)
      router.handle({ url: '/foo', method: 'GET' }, { end: cb }, no)
      router.handle({ url: 'foo', method: 'GET' }, { end: cb }, no)
      router.handle({ url: '*', method: 'GET' }, { end: cb }, no)
    })

    it('should accept array of middleware', function (done) {
      var count = 0;
      var router = new Router();

      function fn1(req, res, next) {
        assert.equal(++count, 1);
        next();
      }

      function fn2(req, res, next) {
        assert.equal(++count, 2);
        next();
      }

      router.use([fn1, fn2], function (req, res) {
        assert.equal(++count, 3);
        done();
      });

      router.handle({ url: '/foo', method: 'GET' }, {}, function () { });
    })
  })

  describe('.param', function () {
    it('should require function', function () {
      var router = new Router();
      assert.throws(router.param.bind(router, 'id'), /argument fn is required/);
    });

    it('should reject non-function', function () {
      var router = new Router();
      assert.throws(router.param.bind(router, 'id', 42), /argument fn must be a function/);
    });

    it('should call param function when routing VERBS', function (done) {
      var router = new Router();

      router.param('id', function (req, res, next, id) {
        assert.equal(id, '123');
        next();
      });

      router.get('/foo/:id/bar', function (req, res, next) {
        assert.equal(req.params.id, '123');
        next();
      });

      router.handle({ url: '/foo/123/bar', method: 'get' }, {}, done);
    });

    it('should call param function when routing middleware', function (done) {
      var router = new Router();

      router.param('id', function (req, res, next, id) {
        assert.equal(id, '123');
        next();
      });

      router.use('/foo/:id/bar', function (req, res, next) {
        assert.equal(req.params.id, '123');
        assert.equal(req.url, '/baz');
        next();
      });

      router.handle({ url: '/foo/123/bar/baz', method: 'get' }, {}, done);
    });

    it('should only call once per request', function (done) {
      var count = 0;
      var req = { url: '/foo/bob/bar', method: 'get' };
      var router = new Router();
      var sub = new Router();

      sub.get('/bar', function (req, res, next) {
        next();
      });

      router.param('user', function (req, res, next, user) {
        count++;
        req.user = user;
        next();
      });

      router.use('/foo/:user/', new Router());
      router.use('/foo/:user/', sub);

      router.handle(req, {}, function (err) {
        if (err) return done(err);
        assert.equal(count, 1);
        assert.equal(req.user, 'bob');
        done();
      });
    });

    it('should call when values differ', function (done) {
      var count = 0;
      var req = { url: '/foo/bob/bar', method: 'get' };
      var router = new Router();
      var sub = new Router();

      sub.get('/bar', function (req, res, next) {
        next();
      });

      router.param('user', function (req, res, next, user) {
        count++;
        req.user = user;
        next();
      });

      router.use('/foo/:user/', new Router());
      router.use('/:user/bob/', sub);

      router.handle(req, {}, function (err) {
        if (err) return done(err);
        assert.equal(count, 2);
        assert.equal(req.user, 'foo');
        done();
      });
    });
  });

  describe('parallel requests', function () {
    it('should not mix requests', function (done) {
      var req1 = { url: '/foo/50/bar', method: 'get' };
      var req2 = { url: '/foo/10/bar', method: 'get' };
      var router = new Router();
      var sub = new Router();
      var cb = after(2, done)


      sub.get('/bar', function (req, res, next) {
        next();
      });

      router.param('ms', function (req, res, next, ms) {
        ms = parseInt(ms, 10);
        req.ms = ms;
        setTimeout(next, ms);
      });

      router.use('/foo/:ms/', new Router());
      router.use('/foo/:ms/', sub);

      router.handle(req1, {}, function (err) {
        assert.ifError(err);
        assert.equal(req1.ms, 50);
        assert.equal(req1.originalUrl, '/foo/50/bar');
        cb()
      });

      router.handle(req2, {}, function (err) {
        assert.ifError(err);
        assert.equal(req2.ms, 10);
        assert.equal(req2.originalUrl, '/foo/10/bar');
        cb()
      });
    });
  });
})