import {describe, it, iit, ddescribe, expect, beforeEach} from 'test_lib/test_lib';
import {Reflector} from 'reflection/src/reflection';
import {ReflectionCapabilities} from 'reflection/src/reflection_capabilities';
import {CONST} from 'facade/src/lang';

class Annotation {
  value;

  @CONST()
  constructor(value) {
    this.value = value;
  }
}

class AType {
  value;

  constructor(value){
    this.value = value;
  }
}

@Annotation('class')
class ClassWithAnnotations {
  a;
  b;

  constructor(@Annotation("a") a:AType, @Annotation("b") b:AType) {
    this.a = a;
    this.b = b;
  }
}

class ClassWithoutAnnotations {
  constructor(a,b){}
}

class TestObjWith11Args {
  constructor(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11) {
  }
}

@Annotation('func')
function testFunc(@Annotation("a") a:AType, @Annotation("b") b:AType) {
}

class TestObj {
  a;
  b;

  constructor(a, b) {
    this.a = a;
    this.b = b;
  }

  identity(arg) {
    return arg;
  }
}

export function main() {
  describe('Reflector', () => {
    var reflector;

    beforeEach(() => {
      reflector = new Reflector(new ReflectionCapabilities());
    });

    describe("factory", () => {
      it("should create a factory for the given type", () => {
        var obj = reflector.factory(TestObj)(1, 2);

        expect(obj.a).toEqual(1);
        expect(obj.b).toEqual(2);
      });

      it("should throw when more than 10 arguments", () => {
        expect(() => reflector.factory(TestObjWith11Args)(1,2,3,4,5,6,7,8,9,10,11)).toThrowError();
      });

      it("should return a registered factory if available", () => {
        reflector.registerType(TestObj, {"factory" : () => "fake"});
        expect(reflector.factory(TestObj)()).toEqual("fake");
      });
    });

    describe("parameters", () => {
      it("should return an array of parameters for a type", () => {
        var p = reflector.parameters(ClassWithAnnotations);
        expect(p).toEqual([[AType, new Annotation('a')], [AType, new Annotation('b')]]);
      });

      it("should return an array of parameters for a function", () => {
        var p = reflector.parameters(testFunc);
        expect(p).toEqual([[AType, new Annotation('a')], [AType, new Annotation('b')]]);
      });

      it("should work for a class without annotations", () => {
        var p = reflector.parameters(ClassWithoutAnnotations);
        expect(p.length).toEqual(2);
      });

      it("should return registered parameters if available", () => {
        reflector.registerType(TestObj, {"parameters" : [1,2]});
        expect(reflector.parameters(TestObj)).toEqual([1,2]);
      });
    });

    describe("annotations", () => {
      it("should return an array of annotations for a type", () => {
        var p = reflector.annotations(ClassWithAnnotations);
        expect(p).toEqual([new Annotation('class')]);
      });

      it("should return an array of annotations for a function", () => {
        var p = reflector.annotations(testFunc);
        expect(p).toEqual([new Annotation('func')]);
      });

      it("should return registered annotations if available", () => {
        reflector.registerType(TestObj, {"annotations" : [1,2]});
        expect(reflector.annotations(TestObj)).toEqual([1,2]);
      });
    });

    describe("getter", () => {
      it("returns a function reading a property", () => {
        var getA = reflector.getter('a');
        expect(getA(new TestObj(1, 2))).toEqual(1);
      });

      it("should return a registered getter if available", () => {
        reflector.registerGetters({"abc" : (obj) => "fake"});
        expect(reflector.getter("abc")("anything")).toEqual("fake");
      });
    });

    describe("setter", () => {
      it("returns a function setting a property", () => {
        var setA = reflector.setter('a');
        var obj = new TestObj(1, 2);
        setA(obj, 100);
        expect(obj.a).toEqual(100);
      });

      it("should return a registered setter if available", () => {
        var updateMe;
        reflector.registerSetters({"abc" : (obj, value) => {updateMe = value;}});
        reflector.setter("abc")("anything", "fake");

        expect(updateMe).toEqual("fake");
      });
    });

    describe("method", () => {
      it("returns a function invoking a method", () => {
        var func = reflector.method('identity');
        var obj = new TestObj(1, 2);
        expect(func(obj, ['value'])).toEqual('value');
      });

      it("should return a registered method if available", () => {
        reflector.registerMethods({"abc" : (obj, args) => args});
        expect(reflector.method("abc")("anything", ["fake"])).toEqual(['fake']);
      });
    });
  });
}