var should = require('should'),
    sinon = require('sinon'),
    Promise = require('bluebird'),

    // Stuff we are testing
    helpers = require('../../../server/helpers'),
    models = require('../../../server/models'),
    api = require('../../../server/api'),

    labs = require('../../../server/services/labs'),

    sandbox = sinon.sandbox.create();

describe('{{#get}} helper', function () {
    var fn, inverse, labsStub;
    let locals = {};

    before(function () {
        models.init();
    });

    beforeEach(function () {
        fn = sandbox.spy();
        inverse = sandbox.spy();
        labsStub = sandbox.stub(labs, 'isSet').returns(true);

        locals = {root: {_locals: {apiVersion: 'v0.1'}}};
    });

    afterEach(function () {
        sandbox.restore();
    });

    it('errors correctly if labs flag not set', function (done) {
        labsStub.returns(false);

        helpers.get.call(
            {},
            'posts',
            {hash: {}, fn: fn, inverse: inverse}
        ).then(function (result) {
            labsStub.calledOnce.should.be.true();
            fn.called.should.be.false();
            inverse.called.should.be.false();

            should.exist(result);
            result.should.be.a.Function();
            result().should.be.an.Object().with.property(
                'string',
                '<script>console.error("The {{get}} helper is not available. ' +
                'The Public API flag must be enabled in labs if you wish to use the {{get}} helper. ' +
                'See https://help.ghost.org/hc/en-us/articles/115000301672-Public-API-Beta");</script>'
            );

            done();
        }).catch(done);
    });

    describe('posts v0.1', function () {
        var browsePostsStub, readPostsStub, readTagsStub, readUsersStub, testPostsArr = [
                {id: 1, title: 'Test Post 1', author: {slug: 'cameron'}},
                {id: 2, title: 'Test Post 2', author: {slug: 'cameron'}, featured: true},
                {id: 3, title: 'Test Post 3', tags: [{slug: 'test'}]},
                {id: 4, title: 'Test Post 4'}
            ],
            meta = {pagination: {}};

        beforeEach(function () {
            browsePostsStub = sandbox.stub(api["v0.1"].posts, 'browse');
            readPostsStub = sandbox.stub(api["v0.1"].posts, 'read');
            readTagsStub = sandbox.stub(api["v0.1"].tags, 'read').returns(new Promise.resolve({tags: []}));
            readUsersStub = sandbox.stub(api["v0.1"].users, 'read').returns(new Promise.resolve({users: []}));

            browsePostsStub.returns(new Promise.resolve({posts: testPostsArr, meta: meta}));
            browsePostsStub.withArgs({limit: '3'}).returns(new Promise.resolve({
                posts: testPostsArr.slice(0, 3),
                meta: meta
            }));
            browsePostsStub.withArgs({limit: '1'}).returns(new Promise.resolve({posts: testPostsArr.slice(0, 1)}));
            browsePostsStub.withArgs({filter: 'tags:test'}).returns(new Promise.resolve({posts: testPostsArr.slice(2, 3)}));
            browsePostsStub.withArgs({filter: 'tags:none'}).returns(new Promise.resolve({posts: []}));
            browsePostsStub.withArgs({filter: 'author:cameron'}).returns(new Promise.resolve({posts: testPostsArr.slice(0, 2)}));
            browsePostsStub.withArgs({filter: 'featured:true'}).returns(new Promise.resolve({posts: testPostsArr.slice(2, 3)}));
            readPostsStub.withArgs({id: '2'}).returns(new Promise.resolve({posts: testPostsArr.slice(1, 2)}));
        });

        it('should handle default browse posts call', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                labsStub.calledOnce.should.be.true();

                fn.called.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.eql(testPostsArr);
                fn.firstCall.args[0].posts.should.have.lengthOf(4);
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should return pagination and meta pagination with default browse posts call', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.firstCall.args[0].pagination.should.be.an.Object();
                fn.firstCall.args[0].meta.should.be.an.Object();
                fn.firstCall.args[0].meta.pagination.should.be.an.Object();
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should not return pagination if meta pagination does not exist', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {limit: '1'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                should.not.exist(fn.firstCall.args[0].pagination);
                should.not.exist(fn.firstCall.args[0].meta);
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should handle browse posts call with limit 3', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {limit: '3'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(3);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(0, 3));
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should handle browse posts call with limit 1', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {limit: '1'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(1);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(0, 1));
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should handle browse posts call with limit 1', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {limit: '1'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(1);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(0, 1));
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should handle browse post call with explicit tag', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {filter: 'tags:test'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(1);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(2, 3));
                inverse.called.should.be.false();
                done();
            }).catch(done);
        });

        it('should handle browse post call with explicit author', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {filter: 'author:cameron'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(2);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(0, 2));
                inverse.called.should.be.false();
                done();
            }).catch(done);
        });

        it('should handle browse post call with featured:true', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {filter: 'featured:true'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(1);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(2, 3));
                inverse.called.should.be.false();
                done();
            }).catch(done);
        });

        it('should handle read post by id call', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {id: '2'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(1);
                fn.firstCall.args[0].posts.should.eql(testPostsArr.slice(1, 2));
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });

        it('should handle empty result set', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {filter: 'tags:none'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.calledOnce.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('posts');
                fn.firstCall.args[0].posts.should.have.lengthOf(0);
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });
    });

    describe('users v0.1', function () {
        let browseUsersStub;
        const meta = {pagination: {}};

        beforeEach(function () {
            browseUsersStub = sandbox.stub(api["v0.1"].users, 'browse');
            browseUsersStub.returns(new Promise.resolve({users: [], meta: meta}));
        });

        it('browse users v0.1', function (done) {
            helpers.get.call(
                {},
                'users',
                {hash: {}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                labsStub.calledOnce.should.be.true();

                fn.called.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('users');
                fn.firstCall.args[0].users.should.eql([]);
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });
    });

    describe('users v2', function () {
        let browseUsersStub;
        const meta = {pagination: {}};

        beforeEach(function () {
            locals = {root: {_locals: {apiVersion: 'v2'}}};

            browseUsersStub = sandbox.stub(api["v2"], 'users').get(() => {
                return {
                    browse: sandbox.stub().resolves({users: [], meta: meta})
                };
            });
        });

        it('browse users', function (done) {
            helpers.get.call(
                {},
                'users',
                {hash: {}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                labsStub.calledOnce.should.be.true();

                fn.called.should.be.true();
                fn.firstCall.args[0].should.be.an.Object().with.property('users');
                fn.firstCall.args[0].users.should.eql([]);
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });
    });

    describe('general error handling', function () {
        it('should return an error for an unknown resource', function (done) {
            helpers.get.call(
                {},
                'magic',
                {hash: {}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.called.should.be.false();
                inverse.calledOnce.should.be.true();
                inverse.firstCall.args[1].should.be.an.Object().and.have.property('data');
                inverse.firstCall.args[1].data.should.be.an.Object().and.have.property('error');
                inverse.firstCall.args[1].data.error.should.eql('Invalid resource given to get helper');

                done();
            }).catch(done);
        });

        it('should handle error from the API', function (done) {
            helpers.get.call(
                {},
                'posts',
                {hash: {status: 'thing!'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                fn.called.should.be.false();
                inverse.calledOnce.should.be.true();
                inverse.firstCall.args[1].should.be.an.Object().and.have.property('data');
                inverse.firstCall.args[1].data.should.be.an.Object().and.have.property('error');
                inverse.firstCall.args[1].data.error.should.match(/^Validation/);

                done();
            }).catch(done);
        });

        it('should show warning for call without any options', function (done) {
            helpers.get.call(
                {},
                'posts',
                {data: locals}
            ).then(function () {
                fn.called.should.be.false();
                inverse.called.should.be.false();

                done();
            }).catch(done);
        });
    });

    describe('path resolution', function () {
        var browseStub, readStub,
            pubDate = new Date(),
            resource = {
                post: {id: 3, title: 'Test 3', author: {slug: 'cameron'}, tags: [{slug: 'test'}, {slug: 'magic'}], published_at: pubDate}
            };

        beforeEach(function () {
            browseStub = sandbox.stub(api["v0.1"].posts, 'browse').returns(new Promise.resolve());
            readStub = sandbox.stub(api["v0.1"].posts, 'read').returns(new Promise.resolve());
        });

        it('should resolve post.tags alias', function (done) {
            helpers.get.call(
                resource,
                'posts',
                {hash: {filter: 'tags:[{{post.tags}}]'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
                browseStub.firstCall.args[0].filter.should.eql('tags:[test,magic]');

                done();
            }).catch(done);
        });

        it('should resolve post.author alias', function (done) {
            helpers.get.call(
                resource,
                'posts',
                {hash: {filter: 'author:{{post.author}}'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
                browseStub.firstCall.args[0].filter.should.eql('author:cameron');

                done();
            }).catch(done);
        });

        it('should resolve basic path', function (done) {
            helpers.get.call(
                resource,
                'posts',
                {hash: {filter: 'id:-{{post.id}}'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
                browseStub.firstCall.args[0].filter.should.eql('id:-3');

                done();
            }).catch(done);
        });

        it('should handle arrays the same as handlebars', function (done) {
            helpers.get.call(
                resource,
                'posts',
                {hash: {filter: 'tags:{{post.tags.[0].slug}}'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
                browseStub.firstCall.args[0].filter.should.eql('tags:test');

                done();
            }).catch(done);
        });

        it('should handle dates', function (done) {
            helpers.get.call(
                resource,
                'posts',
                {hash: {filter: "published_at:<='{{post.published_at}}'"}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
                browseStub.firstCall.args[0].filter.should.eql(`published_at:<='${pubDate.toISOString()}'`);

                done();
            }).catch(done);
        });

        it('should output nothing if path does not resolve', function (done) {
            helpers.get.call(
                resource,
                'posts',
                {hash: {filter: 'id:{{post.thing}}'}, data: locals, fn: fn, inverse: inverse}
            ).then(function () {
                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
                browseStub.firstCall.args[0].filter.should.eql('id:');

                done();
            }).catch(done);
        });
    });
});