"use strict";

var assert = require("chai").assert;
var sinon = require("sinon");
var express = require("express");
var GET = require("./util/http-utils").GET;

var delay = function (method, payload) {
  setTimeout(function () {
    method(payload);
  }, 10);
};

var PromiseRouter = require("../lib/express-promise-router.js");

describe("express-promise-router", function () {
  var app;
  var serverListening;
  var server;
  var router;

  var bootstrap = function (router) {
    app = express();
    app.use("/", router);

    if (serverListening) {
      throw "already bootstrapped";
    }

    serverListening = new Promise(function (resolve, reject) {
      server = app.listen(12345, function (err) {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });

    return serverListening;
  };

  beforeEach(function () {
    router = new PromiseRouter();
  });

  afterEach(function () {
    if (serverListening) {
      return serverListening.then(function () {
        server.close();
        app = undefined;
        server = undefined;
        serverListening = undefined;
      });
    }
  });

  it("should call next with an error when a returned promise is rejected", function () {
    var callback = sinon.spy();

    router.use("/foo", function () {
      return new Promise(function (resolve, reject) {
        delay(reject, "some error");
      });
    });
    router.use(function (err, req, res, next) {
      assert.equal("some error", err);
      callback();
      res.send();
    });

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function () {
        assert(callback.calledOnce);
      });
  });

  it('should call next without an error when a returned promise is resolved with "next"', function () {
    var errorCallback = sinon.spy();
    var nextCallback = sinon.spy();

    router.use("/foo", function () {
      return new Promise(function (resolve) {
        delay(resolve, "next");
      });
    });
    router.use("/foo", function (req, res) {
      nextCallback();
      res.send();
    });
    router.use(function (err, req, res, next) {
      errorCallback();
      next();
    });

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function () {
        assert(errorCallback.notCalled);
        assert(nextCallback.calledOnce);
      });
  });

  it('should not call next when a returned promise is resolved with anything other than "route" or "next"', function () {
    var callback = sinon.spy();

    router.get("/foo", function (req, res) {
      return new Promise(function (resolve) {
        res.send();
        delay(resolve, "something");
      });
    });
    router.get("/bar", function (req, res) {
      return new Promise(function (resolve) {
        res.send();
        delay(resolve, {});
      });
    });
    router.use(function (req, res) {
      callback();
      res.send(500);
    });

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function () {
        assert(callback.notCalled);
        return GET("/bar");
      })
      .then(function () {
        assert(callback.notCalled);
      });
  });

  it("should move to the next middleware when next is called without an error", function () {
    var callback = sinon.spy();

    router.use("/foo", function (req, res, next) {
      next();
    });
    router.use("/foo", function (req, res, next) {
      callback();
      res.send();
    });

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function () {
        assert(callback.calledOnce);
      });
  });

  it("should move to the next error handler when next is called with an error", function () {
    var callback = sinon.spy();
    var errorCallback = sinon.spy();

    router.use("/foo", function (req, res, next) {
      next("an error");
    });
    router.use("/foo", function (req, res, next) {
      callback();
      next();
    });
    router.use(function (err, req, res, next) {
      assert.equal("an error", err);
      errorCallback();
      res.send();
    });

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function () {
        assert(errorCallback.calledOnce);
        assert(callback.notCalled);
      });
  });

  it("should call chained handlers in the correct order", function () {
    var fn2 = sinon.spy(function (req, res) {
      res.send();
    });
    var fn1 = sinon.spy(function () {
      assert(fn2.notCalled);
      return Promise.resolve("next");
    });

    router.get("/foo", fn1, fn2);

    return bootstrap(router).then(function () {
      return GET("/foo");
    });
  });

  it("should correctly call an array of handlers", function () {
    var fn2 = sinon.spy(function (req, res) {
      res.send();
    });
    var fn1 = sinon.spy(function () {
      assert(fn2.notCalled);
      return Promise.resolve("next");
    });

    router.get("/foo", [[fn1], [fn2]]);

    return bootstrap(router).then(function () {
      return GET("/foo");
    });
  });

  it('should call next("route") if a returned promise is resolved with "route"', function () {
    var fn1 = function () {
      return Promise.resolve("route");
    };
    var fn2 = function () {
      assert.fail();
    };

    router.get("/foo", fn1, fn2);
    router.get("/foo", function (req, res) {
      res.send();
    });

    return bootstrap(router).then(function () {
      return GET("/foo");
    });
  });

  it("should bind to RegExp routes", function () {
    var fn1 = function (req, res) {
      res.send();
    };

    router.get(/^\/foo/, fn1);

    return bootstrap(router).then(function () {
      return GET("/foo");
    });
  });

  it('multiple calls to handlers that have used "next" should not interfere with each other', function () {
    var fn = sinon.spy(function (req, res, next) {
      if (fn.calledOnce) {
        next("error");
      } else {
        setTimeout(function () {
          res.status(200).send("ok");
        }, 15);
      }
    });
    var errHandler = function (err, req, res, next) {
      if (err === "error") {
        res.send("fail");
      } else {
        next(err);
      }
    };

    router.get("/foo", fn, errHandler);

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function (res) {
        assert.equal(res.body, "fail");
        return GET("/foo");
      })
      .then(function (res) {
        assert.equal(res.body, "ok");
      });
  });

  it("calls next if next is called even if the handler returns a promise", function () {
    var fn = function (req, res, next) {
      next();
      return new Promise(function (resolve, reject) {});
    };
    var fn2 = function (req, res) {
      res.send("ok");
    };
    var errHandler = function (err, req, res, next) {
      res.send("error");
    };

    router.get("/foo", fn, fn2, errHandler);

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function (res) {
        assert.equal(res.body, "ok");
      });
  });

  it("calls next with an error if the returned promise is rejected with no reason", function () {
    var fn = function () {
      return new Promise(function (resolve, reject) {
        delay(reject, null);
      });
    };
    var errHandler = function (err, req, res, next) {
      res.send("error");
    };

    router.get("/foo", fn, errHandler);

    return bootstrap(router)
      .then(function () {
        return GET("/foo");
      })
      .then(function (res) {
        assert.equal(res.body, "error");
      });
  });

  it("should handle resolved promises returned in req.param() calls", function () {
    router.param("id", function () {
      return new Promise(function (resolve) {
        delay(resolve, "next");
      });
    });
    router.use("/foo/:id", function (req, res) {
      res.send("done");
    });

    return bootstrap(router)
      .then(function () {
        return GET("/foo/1");
      })
      .then(function (res) {
        assert.equal(res.body, "done");
      });
  });

  it("should call next with unresolved promises returned in req.param() calls", function () {
    var assertOutput = "error in param";

    router.param("id", function (req, res, next, id) {
      return new Promise(function (resolve, reject) {
        delay(reject, assertOutput);
      });
    });

    var fn = function (req, res) {
      res.send("done");
    };

    var errHandler = function (err, req, res, next) {
      res.send(err);
    };

    router.use("/foo/:id", fn);

    router.use(errHandler);

    return bootstrap(router)
      .then(function () {
        return GET("/foo/1");
      })
      .then(function (res) {
        assert.equal(res.body, assertOutput);
      });
  });

  it("support array in routes values", function () {
    router.use(["/", "/foo/:bar"], function (req, res) {
      res.send("done");
    });

    return bootstrap(router)
      .then(function () {
        return GET("/");
      })
      .then(function (res) {
        assert.equal(res.body, "done");

        return GET("/foo/1");
      })
      .then(function (res) {
        assert.equal(res.body, "done");
      });
  });

  it("should throw sensible errors when handler is not a function", function () {
    assert.throws(function () {
      router.use("/foo/:id", null);
    }, /callback/);
  });
});