/*eslint-env mocha*/
/*global global*/
import chai, {assert} from 'chai';
import sinon from 'sinon';
import Requester from '../lib/requester';

describe('Requester', () => {
    function xHttpWillRespond(xhttp, readyState, status, statusText, responseText) {
        const stub_send = sinon.stub(xhttp, 'send', function() {
            this.readyState = readyState;
            this.status = status;
            this.statusText = statusText;
            this.responseText = responseText;
            this.onreadystatechange();
        });

        const stub_open = sinon.stub(xhttp, 'open', function() {});

        const stub_setRequestHeader = sinon.stub(xhttp, 'setRequestHeader', function() {});

        return {stub_open, stub_send, stub_setRequestHeader};
    }

    function xHttpWillThrow(xhttp, sendErrorName, openErrorName) {
        const stub_send = sinon.stub(xhttp, 'send', function() {
            if (sendErrorName) {
                const e = new Error(sendErrorName);
                e.name = sendErrorName;
                throw e;
            }
        });

        const stub_open = sinon.stub(xhttp, 'open', function() {
            if (openErrorName) {
                const e = new Error(openErrorName);
                e.name = openErrorName;
                throw e;
            }
        });

        return {stub_open, stub_send};
    }

    let xhttp;

    beforeEach(() => {
        xhttp = {
            setRequestHeader(){},
            open(){},
            send(){}
        };
        global.XMLHttpRequest = () => {
            return xhttp;
        };
    });

    describe('GET Requests', () => {

        it('with data', (done) => {
            const requester = new Requester();

            xHttpWillRespond(xhttp, 4, 200, '', '<p>content!</p>');

            requester.fetch({method: 'GET', uri:'/route1', data:{p1: 'a', p2: 'b', p3: 'c'}},
                (request, response) => {
                    assert(request.method === 'GET');
                    assert(request.uri === '/route1');
                    assert(request.data !== undefined);
                    assert(request.data.p1 === 'a');
                    assert(request.data.p2 === 'b');
                    assert(request.data.p3 === 'c');

                    assert(response.status === 200);
                    assert(response.statusText === 'OK');
                    assert(response.responseText === '<p>content!</p>');
                    assert(response.errorThrown === undefined);
                    assert(response.errors === undefined);

                    done();
                },
                (request, response) => {
                    done(response.error);
                });
        });

        it('without data', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillRespond(xhttp, 4, 200, '', '<p>content!</p>');

            requester.fetch({method: 'GET', uri:'/route1'}, (request, response) => {
                assert(stub_open.calledOnce);
                assert(stub_send.calledOnce);
                assert(stub_open.calledBefore(stub_send));

                assert(request.method === 'GET');
                assert(request.uri === '/route1');
                assert(request.data === undefined);

                assert(response.status === 200);
                assert(response.statusText === 'OK');
                assert(response.responseText === '<p>content!</p>');
                assert(response.errorThrown === undefined);
                assert(response.errors === undefined);

                done();
            },
            (request, response) => {
                done(response.error);
            });
        });
    });

    describe('POST Requests', () => {

        it('with data', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send, stub_setRequestHeader} = xHttpWillRespond(xhttp, 4, 200, '', '<p>content!</p>');

            requester.fetch({method: 'POST', uri:'/route1', headers:{'head1':'value1'}, data:{p1: 'a', p2: 'b', p3: 'c'}},
                (request, response) => {
                    assert(stub_open.calledOnce);
                    assert(stub_setRequestHeader.calledOnce);
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledBefore(stub_send));
                    assert(stub_setRequestHeader.calledAfter(stub_open));
                    assert(stub_setRequestHeader.calledBefore(stub_send));

                    assert(request.method === 'POST');
                    assert(request.uri === '/route1');
                    assert(request.data !== undefined);
                    assert(request.data.p1 === 'a');
                    assert(request.data.p2 === 'b');
                    assert(request.data.p3 === 'c');

                    assert(response.status === 200);
                    assert(response.statusText === 'OK');
                    assert(response.responseText === '<p>content!</p>');
                    assert(response.errorThrown === undefined);
                    assert(response.errors === undefined);

                    done();
                },
                (request, response) => {
                    done(response.error);
                });
        });

        it('without data', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send, stub_setRequestHeader} = xHttpWillRespond(xhttp, 4, 200, '', '<p>content!</p>');

            requester.fetch({method: 'POST', uri:'/route1'},
                (request, response) => {
                    assert(stub_open.calledOnce);
                    assert(stub_setRequestHeader.callCount === 0);
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledBefore(stub_send));

                    assert(request.method === 'POST');
                    assert(request.uri === '/route1');
                    assert(request.data === undefined);

                    done();
                },
                (request, response) => {
                    done(response.error);
                });
        });

        it('with custom headers', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send, stub_setRequestHeader} = xHttpWillRespond(xhttp, 4, 200, '', '<p>content!</p>');

            requester.fetch({method: 'POST', uri:'/route1', headers: {'Accept-Charset': 'utf-8'}},
                (request, response) => {
                    assert(stub_open.calledOnce);
                    assert(stub_setRequestHeader.calledOnce);
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledBefore(stub_send));
                    assert(stub_setRequestHeader.calledAfter(stub_open));
                    assert(stub_setRequestHeader.calledBefore(stub_send));

                    assert(request.method === 'POST');
                    assert(request.uri === '/route1');
                    assert(request.headers['Accept-Charset'] === 'utf-8');
                    assert(request.data === undefined);
                    done();
                },
                (request, response) => {
                    done(response.error);
                });
        });
    });

    describe('HTTP errors', () => {
        it('request returns no network', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillRespond(xhttp, 4, 0);

            requester.fetch({method: 'GET', uri: '/route1'}, null,
                (request, response) => {
                    assert(stub_open.calledOnce);
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledBefore(stub_send));

                    assert(response.status === 0);
                    assert(response.statusText === undefined);
                    assert(response.responseText === undefined);
                    assert(response.errorThrown === undefined);
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns 401', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillRespond(xhttp, 4, 401, 'not authenticated', '');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === 401);
                    assert(response.statusText === 'not authenticated');
                    assert(response.responseText === undefined);
                    assert(response.errorThrown === undefined);
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns 404', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillRespond(xhttp, 4, 404, 'page not found', '');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === 404);
                    assert(response.statusText === 'page not found');
                    assert(response.responseText === undefined);
                    assert(response.errorThrown === undefined);
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns 500', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillRespond(xhttp, 4, 500, 'server error', '');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === 500);
                    assert(response.statusText === 'server error');
                    assert(response.responseText === undefined);
                    assert(response.errorThrown === undefined);
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns 501 (http status not managed)', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillRespond(xhttp, 4, 501, 'Not Implemented', '');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === 501);
                    assert(response.statusText === 'Not Implemented');
                    assert(response.responseText === undefined);
                    assert(response.errorThrown === undefined);
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns syntax error', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillThrow(xhttp, 'SyntaxError');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === undefined);
                    assert(response.statusText === undefined);
                    assert(response.responseText === undefined);
                    assert(response.errorThrown.name === 'SyntaxError');
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns timeout error', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillThrow(xhttp, 'TimeoutError');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === undefined);
                    assert(response.statusText === undefined);
                    assert(response.responseText === undefined);
                    assert(response.errorThrown.name === 'TimeoutError');
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns abort error', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillThrow(xhttp, 'AbortError');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === undefined);
                    assert(response.statusText === undefined);
                    assert(response.responseText === undefined);
                    assert(response.errorThrown.name === 'AbortError');
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns network error', (done) => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillThrow(xhttp, 'NetworkError');

            requester.fetch({method: 'GET', uri:'/route1'}, null,
                (request, response) => {
                    assert(stub_send.calledOnce);
                    assert(stub_open.calledOnce);

                    assert(response.status === undefined);
                    assert(response.statusText === undefined);
                    assert(response.responseText === undefined);
                    assert(response.errorThrown.name === 'NetworkError');
                    assert(response.errors.length !== 0);

                    done();
                });
        });

        it('request returns unknown error', () => {
            const requester = new Requester();

            const {stub_open, stub_send} = xHttpWillThrow(xhttp, 'BlaBlaError');

            chai.expect(() => {
                requester.fetch({method: 'GET', uri:'/route1'});
            }).to.throw(/BlaBlaError/);

        });
    });
});